Precision Micropower,
Low Dropout Voltage References
Data Sheet REF19x Series
Rev. L
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FEATURES
Temperature coefficient: 5 ppm/°C maximum
High output current: 30 mA
Low supply current: 45 μA maximum
Initial accuracy: ±2 mV maximum1
Sleep mode: 15 μA maximum
Low dropout voltage
Load regulation: 4 ppm/mA
Line regulation: 4 ppm/V
Short-circuit protection
APPLICATIONS
Portable instruments
ADCs and DACs
Smart sensors
Solar powered applications
Loop-current-powered instruments
GENERAL DESCRIPTION
The REF19x series precision band gap voltage references use a
patented temperature drift curvature correction circuit and
laser trimming of highly stable, thin-film resistors to achieve a
very low temperature coefficient and high initial accuracy.
The REF19x series is made up of micropower, low dropout
voltage (LDV) devices, providing stable output voltage from
supplies as low as 100 mV above the output voltage and
consuming less than 45 μA of supply current. In sleep mode,
which is enabled by applying a low TTL or CMOS level to the
SLEEP pin, the output is turned off and supply current is
further reduced to less than 15 μA.
The REF19x series references are specified over the extended
industrial temperature range (−40°C to +85°C) with typical
performance specifications over −40°C to +125°C for
applications, such as automotive.
All electrical grades are available in an 8-lead SOIC package; the
PDIP and TSSOP packages are available only in the lowest
electrical grade.
TEST PINS
Test Pin 1 and Test Pin 5 are reserved for in-package Zener zap.
To achieve the highest level of accuracy at the output, the Zener
zapping technique is used to trim the output voltage. Because
each unit may require a different amount of adjustment, the
resistance value at the test pins varies widely from pin to pin
and from part to part. The user should leave Pin 1 and Pin 5
unconnected.
REF19x
SERIES
TOP VIEW
(Not to Scale)
TP
1
V
S2
SLEEP
3
GND
4
NC
NC
OUTPUT
TP
8
7
6
5
00371-001
NOTES
1. NC = NO CONNECT.
2. TP PINS ARE FACTORY TEST
POINTS, NO USER CONNECTION.
Figure 1. 8-Lead SOIC_N and TSSOP Pin Configuration
(S Suffix and RU Suffix)
REF19x
SERIES
TOP VIEW
(Not to Scale)
TP
1
V
S2
SLEEP
3
GND
4
NC
NC
OUTPUT
TP
8
7
6
5
00371-002
NOTES
1. NC = NO CONNECT.
2. TP PINS ARE FACTORY TEST
POINTS, NO USER CONNECTION.
Figure 2. 8-Lead PDIP Pin Configuration
(P Suffix)
Table 1. Nominal Output Voltage
Part Number Nominal Output Voltage (V)
REF191 2.048
REF192 2.50
REF193 3.00
REF194 4.50
REF195 5.00
REF196 3.30
REF198 4.096
1 Initial accuracy does not include shift due to solder heat effect (see the
Applications Information section).
REF19x Series Data Sheet
Rev. L | Page 2 of 28
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Test Pins ............................................................................................. 1
Revision History ............................................................................... 3
Specifications..................................................................................... 4
Electrical Characteristics—REF191 @ TA = 25°C.................... 4
Electrical Characteristics—REF191 @ −40°C ≤ +85°C........... 5
Electrical Characteristics—REF191 @
−40°C ≤ TA ≤ +125°C................................................................... 6
Electrical Characteristics—REF192 @ TA = 25°C.................... 6
Electrical Characteristics—REF192 @ −40°C ≤ TA ≤ +85°C
......................................................................................................... 7
Electrical Characteristics—REF192 @ −40°C ≤ TA ≤ +125°C
......................................................................................................... 7
Electrical Characteristics—REF193 @ TA = 25°C.................... 8
Electrical Characteristics—REF193 @ −40°C ≤ TA ≤ +85°C
......................................................................................................... 8
Electrical Characteristics—REF193 @ TA ≤ −40°C ≤ +125°C
......................................................................................................... 9
Electrical Characteristics—REF194 @ TA = 25°C.................... 9
Electrical Characteristics—REF194 @ −40°C ≤ TA ≤ +85°C
....................................................................................................... 10
Electrical Characteristics—REF194 @ −40°C ≤ TA ≤ +125°C
....................................................................................................... 10
Electrical Characteristics—REF195 @ TA = 25°C.................. 11
Electrical Characteristics—REF195 @ −40°C ≤ TA ≤ +85°C
....................................................................................................... 11
Electrical Characteristics—REF195 @ −40°C ≤ TA ≤ +125°C
....................................................................................................... 12
Electrical Characteristics—REF196 @ TA = 25°C.................. 12
Electrical Characteristics—REF196 @ −40°C ≤ TA ≤ +85°C
....................................................................................................... 13
Electrical Characteristics—REF196 @ −40°C ≤ TA ≤ +125°C
....................................................................................................... 13
Electrical Characteristics—REF198 @ TA = 25°C.................. 14
Electrical Characteristics—REF198 @ −40°C ≤ TA ≤ +85°C
....................................................................................................... 14
Electrical Characteristics—REF198 @ −40°C ≤ TA ≤ 125°C15
Absolute Maximum Ratings ......................................................... 16
Thermal Resistance.................................................................... 16
ESD Caution................................................................................ 16
Typical Performance Characteristics ........................................... 17
Applications Information.............................................................. 20
Output Short-Circuit Behavior ................................................ 20
Device Power Dissipation Considerations.............................. 20
Output Voltage Bypassing......................................................... 20
Sleep Mode Operation............................................................... 20
Basic Voltage Reference Connections ..................................... 20
Membrane Switch-Controlled Power Supply............................. 20
Solder Hear Effect ...................................................................... 21
Current-Boosted References with Current Limiting............. 21
Negative Precision Reference Without Precision Resistors.. 22
Stacking Reference ICs for Arbitrary Outputs ....................... 22
Precision Current Source .......................................................... 23
Switched Output 5 V/3.3 V Reference..................................... 23
Kelvin Connections.................................................................... 24
Fail-Safe 5 V Reference.............................................................. 24
Low Power, Strain Gage Circuit ............................................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 27
Data Sheet REF19x Series
Rev. L | Page 3 of 28
REVISION HISTORY
9/11—Rev. K to Rev. L
Change to Condition Column for Dropout Voltage Parameter,
Table 2 ................................................................................................. 4
Change to Condition Column for Dropout Voltage Parameter,
Table 3 ................................................................................................. 5
Change to Operating Temperature Range, Table 23 ................... 16
7/10—Rev. J to Rev. K
Add Note 1, Features Section ........................................................... 1
Changes to Note 1, Table 2 ............................................................... 4
Changes to Note 1, Table 5 ............................................................... 6
Changes to Note 1, Table 8 ............................................................... 8
Changes to Note 1, Table 11 ............................................................. 9
Changes to Note 1, Table 14 ........................................................... 11
Changes to Note 1, Table 17 ........................................................... 12
Changes to Note 1, Table 20 ........................................................... 14
Moved Figure 22 .............................................................................. 20
Added Figure 23, Solder Heat Effect Section, and Figure 24;
Renumbered Sequentially .............................................................. 21
Moved Negative Precision Reference Without Precision
Resistors Section .............................................................................. 22
Moved Precision Current Source Section .................................... 23
Moved Kelvin Connections Section ............................................. 24
Moved Figure 32 .............................................................................. 25
Updated Outline Dimensions ........................................................ 26
Changes to Ordering Guide ........................................................... 27
3/08—Rev. I to Rev. J
Changes to General Description ..................................................... 1
Changes to Specifications Section ................................................... 4
Deleted Wafer Test Limits Section ................................................ 14
Changes to Table 23, Thermal Resistance Section, and
Table 24 ............................................................................................. 16
Changes to Figure 6 ......................................................................... 17
Changes to Device Power Dissipation
Considerations Section ................................................................... 20
Changes to Current-Boosted References with Current
Limiting Section .............................................................................. 21
Changes to Precision Current Source Section ............................ 22
Changes to Figure 28 ...................................................................... 23
Changes to Figure 30 ...................................................................... 24
Changes to Low Power, Strain Gage Circuit Section .................. 25
Changes to Ordering Guide ........................................................... 27
9/06—Rev. H to Rev. I
Updated Format ................................................................. Universal
Changes to Table 25 ........................................................................ 16
Changes to Figure 6 ........................................................................ 16
Changes to Figure 10, Figure 12, Figure 14, and Figure 26 ....... 17
Changes to Figure 18 ...................................................................... 18
Changes to Figure 20 ...................................................................... 19
Changes to Figure 23 ...................................................................... 20
Changes to Figure 25 ...................................................................... 21
Updated Outline Dimensions ........................................................ 25
Changes to Ordering Guide ........................................................... 26
6/05—Rev. G to Rev. H
Updated Format ................................................................. Universal
Changes to Caption in Figure 7 ..................................................... 16
Updated Outline Dimensions ........................................................ 25
Changes to Ordering Guide ........................................................... 26
7/04—Rev. F to Rev. G
Changes to Ordering Guide ............................................................. 4
3/04—Rev. E to Rev. F
Updated Absolute Maximum Rating .............................................. 4
Changes to Ordering Guide ........................................................... 14
Updated Outline Dimensions ........................................................ 24
1/03—Rev. D to Rev. E
Changes to Figure 3 and Figure 4 ................................................. 15
Changes to Output Short Circuit Behavior ................................. 17
Changes to Figure 20 ...................................................................... 17
Changes to Figure 26 ...................................................................... 19
Updated Outline Dimensions ........................................................ 23
1/96—Revision 0: Initial Version
REF19x Series Data Sheet
Rev. L | Page 4 of 28
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—REF191 @ TA = 25°C
@ VS = 3.3 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Condition Min Typ Max Unit
INITIAL ACCURACY1 V
O
E Grade IOUT = 0 mA 2.046 2.048 2.050 V
F Grade 2.043 2.053 V
G Grade 2.038 2.058 V
LINE REGULATION2 ΔVO/ΔVIN
E Grade 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA 2 4 ppm/V
F and G Grades 4 8 ppm/V
LOAD REGULATION2 ΔVO/ΔVLOAD
E Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA 4 10 ppm/mA
F and G Grades 6 15 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.0 V, ILOAD = 2 mA 0.95 V
V
S = 3.3 V, ILOAD = 10 mA 1.25 V
V
S = 3.6 V, ILOAD = 30 mA 1.55 V
LONG-TERM STABILITY3 DVO 1000 hours @ 125°C 1.2 mV
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 20 μV p-p
1 Initial accuracy does not include shift due to solder heat effect (see the Applications Information section).
2 Line and load regulation specifications include the effect of self-heating.
3 Long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.
Data Sheet REF19x Series
Rev. L | Page 5 of 28
ELECTRICAL CHARACTERISTICS—REF191 @ −40°C ≤ +85°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 3.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 5 ppm/°C
F Grade 5 10 ppm/°C
G Grade3 10 25 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA 5 10 ppm/V
F and G Grades 10 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
E Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 25 mA 5 15 ppm/mA
F and G Grades 10 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.0 V, ILOAD = 2 mA 0.95 V
V
S = 3.3 V, ILOAD = 10 mA 1.25 V
V
S = 3.6 V, ILOAD = 25 mA 1.55 V
SLEEP PIN
Logic High Input Voltage VH 2.4 V
Logic High Input Current IH −8 μA
Logic Low Input Voltage VL 0.8 V
Logic Low Input Current IL −8 μA
SUPPLY CURRENT No load 45 μA
Sleep Mode No load 15 μA
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
REF19x Series Data Sheet
Rev. L | Page 6 of 28
ELECTRICAL CHARACTERISTICS—REF191 @ −40°C ≤ TA ≤ +125°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 4.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 ppm/°C
F Grade 5 ppm/°C
G Grade3 10 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA 10 ppm/V
F and G Grades 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
E Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA 10 ppm/mA
F and G Grades 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.3 V, ILOAD = 10 mA 1.25 V
V
S = 3.6 V, ILOAD = 20 mA 1.55 V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF192 @ TA = 25°C
@ VS = 3.3 V, TA = 25°C, unless otherwise noted.
Table 5.
Parameter Symbol Condition Min Typ Max Unit
INITIAL ACCURACY1 V
O
E Grade IOUT = 0 mA 2.498 2.500 2.502 V
F Grade 2.495 2.505 V
G Grade 2.490 2.510 V
LINE REGULATION2 ΔVO/ΔVIN
E Grade 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA 2 4 ppm/V
F and G Grades 4 8 ppm/V
LOAD REGULATION2 ΔVO/ΔVLOAD
E Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA 4 10 ppm/mA
F and G Grades 6 15 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.5 V, ILOAD = 10 mA 1.00 V
V
S = 3.9 V, ILOAD = 30 mA 1.40 V
LONG-TERM STABILITY3 DVO 1000 hours @ 125°C 1.2 mV
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 25 μV p-p
1 Initial accuracy does not include shift due to solder heat effect (see the Applications Information section).
2 Line and load regulation specifications include the effect of self-heating.
3 Long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.
Data Sheet REF19x Series
Rev. L | Page 7 of 28
ELECTRICAL CHARACTERISTICS—REF192 @ −40°C ≤ TA ≤ +85°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 6.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 5 ppm/°C
F Grade 5 10 ppm/°C
G Grade3 10 25 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA 5 10 ppm/V
F and G Grades 10 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
E Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 25 mA 5 15 ppm/mA
F and G Grades 10 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.5 V, ILOAD = 10 mA 1.00 V
V
S = 4.0 V, ILOAD = 25 mA 1.50 V
SLEEP PIN
Logic High Input Voltage VH 2.4 V
Logic High Input Current IH −8 μA
Logic Low Input Voltage VL 0.8 V
Logic Low Input Current IL −8 μA
SUPPLY CURRENT No load 45 μA
Sleep Mode No load 15 μA
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF192 @ −40°C ≤ TA ≤ +125°C
@ VS = 3.3 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 7.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 ppm/°C
F Grade 5 ppm/°C
G Grade3 10 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA 10 ppm/V
F and G Grades 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
E Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA 10 ppm/mA
F and G Grades 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.5 V, ILOAD = 10 mA 1.00 V
V
S = 4.0 V, ILOAD = 20 mA 1.50 V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
REF19x Series Data Sheet
Rev. L | Page 8 of 28
ELECTRICAL CHARACTERISTICS—REF193 @ TA = 25°C
@ VS = 3.3 V, TA = 25°C, unless otherwise noted.
Table 8.
Parameter Symbol Condition Min Typ Max Unit
INITIAL ACCURACY1 V
O
G Grade IOUT = 0 mA 2.990 3.0 3.010 V
LINE REGULATION2 ΔVO/ΔVIN
G Grade 3.3 V, ≤ VS ≤ 15 V, IOUT = 0 mA 4 8 ppm/V
LOAD REGULATION2 ΔVO/ΔVLOAD
G Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA 6 15 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.8 V, ILOAD = 10 mA 0.80 V
V
S = 4.0 V, ILOAD = 30 mA 1.00 V
LONG-TERM STABILITY3 DVO 1000 hours @ 125°C 1.2 mV
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 30 μV p-p
1 Initial accuracy does not include shift due to solder heat effect (see the Applications Information section).
2 Line and load regulation specifications include the effect of self-heating.
3 Long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.
ELECTRICAL CHARACTERISTICS—REF193 @ −40°C ≤ TA ≤ +85°C
@ VS = 3.3 V, TA = −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 9.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
G Grade3 I
OUT = 0 mA 10 25 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
G Grade 3.3 V ≤ VS ≤ 15 V, IOUT = 0 mA 10 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
G Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 25 mA 10 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.8 V, ILOAD = 10 mA 0.80 V
V
S = 4.1 V, ILOAD = 30 mA 1.10 V
SLEEP PIN
Logic High Input Voltage VH 2.4
V
Logic High Input Current IH
−8 μA
Logic Low Input Voltage VL
0.8 V
Logic Low Input Current IL
−8 μA
SUPPLY CURRENT No load 45 μA
Sleep Mode No load 15 μA
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Data Sheet REF19x Series
Rev. L | Page 9 of 28
ELECTRICAL CHARACTERISTICS—REF193 @ TA ≤ −40°C ≤ +125°C
@ VS = 3.3 V, –40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 10.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
G Grade3 I
OUT = 0 mA 10 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
G Grade 3.3 V ≤ VS ≤ 15 V, IOUT = 0 mA 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
G Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA 10 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 3.8 V, ILOAD = 10 mA 0.80 V
V
S = 4.1 V, ILOAD = 20 mA 1.10 V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF194 @ TA = 25°C
@ VS = 5.0 V, TA = 25°C, unless otherwise noted.
Table 11.
Parameter Symbol Condition Min Typ Max Unit
INITIAL ACCURACY1 V
O
E Grade IOUT = 0 mA 4.498 4.5 4.502 V
G Grade 4.490 4.510 V
LINE REGULATION2 ∆VO/∆VIN
E Grade 4.75 V ≤ VS ≤ 15 V, IOUT = 0 mA 2 4 ppm/V
G Grade 4 8 ppm/V
LOAD REGULATION2 ∆VO/∆VLOAD
E Grade VS = 5.8 V, 0 mA ≤ IOUT ≤ 30 mA 2 4 ppm/mA
G Grade 4 8 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 5.00 V, ILOAD = 10 mA 0.50 V
V
S = 5.8 V, ILOAD = 30 mA 1.30 V
LONG-TERM STABILITY3 DVO 1000 hours @ 125°C 2 mV
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 45 μV p-p
1 Initial accuracy does not include shift due to solder heat effect (see the Applications Information section).
2 Line and load regulation specifications include the effect of self-heating.
3 Long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.
REF19x Series Data Sheet
Rev. L | Page 10 of 28
ELECTRICAL CHARACTERISTICS—REF194 @ −40°C ≤ TA ≤ +85°C
@ VS = 5.0 V, TA = −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 12.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 5 ppm/°C
G Grade3 10 25 ppm/°C
LINE REGULATION4 ∆VO/∆VIN
E Grade 4.75 V ≤ VS ≤ 15 V, IOUT = 0 mA 5 10 ppm/V
G Grade 10 20 ppm/V
LOAD REGULATION4 ∆VO/∆VLOAD
E Grade VS = 5.80 V, 0 mA ≤ IOUT ≤ 25 mA 5 15 ppm/mA
G Grade 10 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 5.00 V, ILOAD = 10 mA 0.5 V
V
S = 5.80 V, ILOAD = 25 mA 1.30 V
SLEEP PIN
Logic High Input Voltage VH 2.4 V
Logic High Input Current IH −8 μA
Logic Low Input Voltage VL 0.8 V
Logic Low Input Current IL −8 μA
SUPPLY CURRENT No load 45 μA
Sleep Mode No load 15 μA
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF194 @ −40°C ≤ TA ≤ +125°C
@ VS = 5.0 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 13.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 ppm/°C
G Grade3 10 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 4.75 V ≤ VS ≤ 15 V, IOUT = 0 mA 5 ppm/V
G Grade 10 ppm/V
LOAD REGULATION ΔVO/ΔVLOAD
E Grade VS = 5.80 V, 0 mA ≤ IOUT ≤ 20 mA 5 ppm/mA
Grade 10 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 5.10 V, ILOAD = 10 mA 0.60 V
V
S = 5.95 V, ILOAD = 20 mA 1.45 V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Data Sheet REF19x Series
Rev. L | Page 11 of 28
ELECTRICAL CHARACTERISTICS—REF195 @ TA = 25°C
@ VS = 5.10 V, TA = 25°C, unless otherwise noted.
Table 14.
Parameter Symbol Condition Min Typ Max Unit
INITIAL ACCURACY1 V
O
E Grade IOUT = 0 mA 4.998 5.0 5.002 V
F Grade 4.995 5.005 V
G Grade 4.990 5.010 V
LINE REGULATION2 ΔVO/ΔVIN
E Grade 5.10 V ≤ VS ≤ 15 V, IOUT = 0 mA 2 4 ppm/V
F and G Grades 4 8 ppm/V
LOAD REGULATION2 ΔVO/ΔVLOAD
E Grade VS = 6.30 V, 0 mA ≤ IOUT ≤ 30 mA 2 4 ppm/mA
F and G Grades 4 8 ppm/mA
DROPOUT VOLTAGE VS − VO VS = 5.50 V, ILOAD = 10 mA 0.50 V
V
S = 6.30 V, ILOAD = 30 mA 1.30 V
LONG-TERM STABILITY3 DVO 1000 hours @ 125°C 1.2 mV
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 50 μV p-p
1 Initial accuracy does not include shift due to solder heat effect (see the Applications Information section).
2 Line and load regulation specifications include the effect of self-heating.
3 Long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.
ELECTRICAL CHARACTERISTICS—REF195 @ −40°C ≤ TA ≤ +85°C
@ VS = 5.15 V, TA = −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 15.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 5 ppm/°C
F Grade 5 10 ppm/°C
G Grade3 10 25 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 5.15 V ≤ VS ≤ 15 V, IOUT = 0 mA 5 10 ppm/V
F and G Grades 10 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
E Grade VS = 6.30 V, 0 mA ≤ IOUT ≤ 25 mA 5 10 ppm/mA
F and G Grades 10 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 5.50 V, ILOAD = 10 mA 0.50 V
V
S = 6.30 V, ILOAD = 25 mA 1.30 V
SLEEP PIN
Logic High Input Voltage VH 2.4 V
Logic High Input Current IH −8 μA
Logic Low Input Voltage VL 0.8 V
Logic Low Input Current IL −8 μA
SUPPLY CURRENT No load 45 μA
Sleep Mode No load 15 μA
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
REF19x Series Data Sheet
Rev. L | Page 12 of 28
ELECTRICAL CHARACTERISTICS—REF195 @ −40°C ≤ TA ≤ +125°C
@ VS = 5.20 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 16.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 ppm/°C
F Grade 5 ppm/°C
G Grade3 10 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 5.20 V ≤ VS ≤ 15 V, IOUT = 0 mA 5 ppm/V
F and G Grades 10 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
E Grade VS = 6.45 V, 0 mA ≤ IOUT ≤ 20 mA 5 ppm/mA
F and G Grades 10 ppm/mA
DROPOUT VOLTAGE VS − VO VS = 5.60 V, ILOAD = 10 mA 0.60 V
V
S = 6.45 V, ILOAD = 20 mA 1.45 V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF196 @ TA = 25°C
@ VS = 3.5 V, TA = 25°C, unless otherwise noted.
Table 17.
Parameter Symbol Condition Min Typ Max Unit
INITIAL ACCURACY1 V
O
G Grade IOUT = 0 mA 3.290 3.3 3.310 V
LINE REGULATION2 ΔVO/ΔVIN
G Grade 3.50 V ≤ VS ≤ 15 V, IOUT = 0 mA 4 8 ppm/V
LOAD REGULATION2 ΔVO/ΔVLOAD
G Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA 6 15 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 4.1 V, ILOAD = 10 mA 0.80 V
V
S = 4.3 V, ILOAD = 30 mA 1.00 V
LONG-TERM STABILITY3 DVO 1000 hours @ 125°C 1.2 mV
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 33 μV p-p
1 Initial accuracy does not include shift due to solder heat effect (see the Applications Information section).
2 Line and load regulation specifications include the effect of self-heating.
3 Long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.
Data Sheet REF19x Series
Rev. L | Page 13 of 28
ELECTRICAL CHARACTERISTICS—REF196 @ −40°C ≤ TA ≤ +85°C
@ VS = 3.5 V, TA = –40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 18.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
G Grade3 I
OUT = 0 mA 10 25 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
G Grade 3.5 V ≤ VS ≤ 15 V, IOUT = 0 mA 10 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
G Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 25 mA 10 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 4.1 V, ILOAD = 10 mA 0.80 V
V
S = 4.3 V, ILOAD = 25 mA 1.00 V
SLEEP PIN
Logic High Input Voltage VH 2.4
V
Logic High Input Current IH −8 μA
Logic Low Input Voltage VL 0.8 V
Logic Low Input Current IL −8 μA
SUPPLY CURRENT No load 45 μA
Sleep Mode No load 15 μA
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/V0(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
ELECTRICAL CHARACTERISTICS—REF196 @ −40°C ≤ TA ≤ +125°C
@ VS = 3.50 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 19.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
G Grade3 I
OUT = 0 mA 10 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
G Grade 3.50 V ≤ VS ≤ 15 V, IOUT = 0 mA 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
G Grade VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 4.1 V, ILOAD = 10 mA 0.80 V
V
S = 4.4 V, ILOAD = 20 mA 1.10 V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
REF19x Series Data Sheet
Rev. L | Page 14 of 28
ELECTRICAL CHARACTERISTICS—REF198 @ TA = 25°C
@ VS = 5.0 V, TA = 25°C, unless otherwise noted.
Table 20.
Parameter Symbol Condition Min Typ Max Unit
INITIAL ACCURACY1 V
O
E Grade IOUT = 0 mA 4.094 4.096 4.098 V
F Grade 4.091 4.101 V
G Grade 4.086 4.106 V
LINE REGULATION2 ΔVO/ΔVIN
E Grade 4.5 V ≤ VS ≤ 15 V, IOUT = 0 mA 2 4 ppm/V
F and G Grades 4 8 ppm/V
LOAD REGULATION2 ΔVO/ΔVLOAD
E Grade VS = 5.4 V, 0 mA ≤ IOUT ≤ 30 mA 2 4 ppm/mA
F and G Grades 4 8 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 4.6 V, ILOAD = 10 mA 0.502 V
V
S = 5.4 V, ILOAD = 30 mA 1.30 V
LONG-TERM STABILITY3 DVO 1000 hours @ 125°C 1.2 mV
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 40 μV p-p
1 Initial accuracy does not include shift due to solder heat effect (see the Applications Information section).
2 Line and load regulation specifications include the effect of self-heating.
3 Long-term stability specification is noncumulative. The drift in subsequent 1000-hour periods is significantly lower than in the first 1000-hour period.
ELECTRICAL CHARACTERISTICS—REF198 @ −40°C ≤ TA ≤ +85°C
@ VS = 5.0 V, −40°C ≤ TA ≤ +85°C, unless otherwise noted.
Table 21.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 5 ppm/°C
F Grade 5 10 ppm/°C
G Grade3 10 25 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 4.5 V ≤ VS ≤ 15 V, IOUT = 0 mA 5 10 ppm/V
F and G Grades 10 20 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
E Grade VS = 5.4 V, 0 mA ≤ IOUT ≤ 25 mA 5 10 ppm/mA
F and G Grades 10 20 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 4.6 V, ILOAD = 10 mA 0.502 V
V
S = 5.4 V, ILOAD = 25 mA 1.30 V
SLEEP PIN
Logic High Input Voltage VH 2.4 V
Logic High Input Current IH −8 μA
Logic Low Input Voltage VL 0.8 V
Logic Low Input Current IL −8 μA
SUPPLY CURRENT No load 45 μA
Sleep Mode No load 15 μA
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
Data Sheet REF19x Series
Rev. L | Page 15 of 28
ELECTRICAL CHARACTERISTICS—REF198 @ −40°C ≤ TA ≤ +125°C
@ VS = 5.0 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 22.
Parameter Symbol Condition Min Typ Max Unit
TEMPERATURE COEFFICIENT1, 2 TCVO/°C
E Grade IOUT = 0 mA 2 ppm/°C
F Grade 5 ppm/°C
G Grade3 10 ppm/°C
LINE REGULATION4 ΔVO/ΔVIN
E Grade 4.5 V ≤ VS ≤ 15 V, IOUT = 0 mA 5 ppm/V
F and G Grades 10 ppm/V
LOAD REGULATION4 ΔVO/ΔVLOAD
E Grade VS = 5.6 V, 0 mA ≤ IOUT ≤ 20 mA 5 ppm/mA
F and G Grades 10 ppm/mA
DROPOUT VOLTAGE VS − VO V
S = 4.7 V, ILOAD = 10 mA 0.60 V
V
S = 5.6 V, ILOAD = 20 mA 1.50 V
1 For proper operation, a 1 μF capacitor is required between the output pin and the GND pin of the device.
2 TCVO is defined as the ratio of output change with temperature variation to the specified temperature range expressed in ppm/°C.
TCVO = (VMAX − VMIN)/VO(TMAX − TMIN)
3 Guaranteed by characterization.
4 Line and load regulation specifications include the effect of self-heating.
REF19x Series Data Sheet
Rev. L | Page 16 of 28
ABSOLUTE MAXIMUM RATINGS
Table 23.
Parameter Rating
Supply Voltage −0.3 V to +18 V
Output to GND −0.3 V to VS + 0.3 V
Output to GND Short-Circuit Duration Indefinite
Storage Temperature Range
PDIP, SOIC Package −65°C to +150°C
Operating Temperature Range
REF19x −40°C to +125°C
Junction Temperature Range
PDIP, SOIC Package −65°C to +150°C
Lead Temperature (Soldering 60 sec) 300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for worst-case conditions; that is, θJA is specified
for the device in socket for PDIP and is specified for the device
soldered in the circuit board for the SOIC and TSSOP packages.
Table 24.
Package Type θJA θJC Unit
8-Lead PDIP (N) 103 43 °C/W
8-Lead SOIC (R) 158 43 °C/W
8-Lead TSSOP (RU) 240 43 °C/W
ESD CAUTION
Data Sheet REF19x Series
Rev. L | Page 17 of 28
TYPICAL PERFORMANCE CHARACTERISTICS
00371-003
TEMPERATURE (°C)
100–50 –25 0 25 50 75
OUTPUT VOLTAGE (V)
5.004
5.003
5.001
5.002
5.000
4.999
4.998
4.997
4.996
3 TYPICAL PARTS
5.15V < V
IN
< 15V
Figure 3. REF195 Output Voltage vs. Temperature
00371-004
I
LOAD
(mA)
300 5 10 15 20 25
LOAD REGULATION (ppm/V)
32
24
28
20
16
12
4
8
0
–40°C
+25°C
5.15V ≤ V
S
≤ 15V
+85°C
Figure 4. REF195 Load Regulator vs. ILOAD
V
IN
(V)
1646 8 101214
LINE REGUL
A
TION (ppm/mA)
20
16
12
8
4
0
+85°C
+25°C
–40°C
0mA ≤ I
OUT
≤ 25mA
00371-005
Figure 5. REF195 Line Regulator vs. VIN
T
C
V
OUT
(ppm/°C)
20–20 –10–15 0–5 10 155
PERCENTAGE OF PARTS
50
45
40
30
35
20
25
10
5
15
0
BASED ON 600
UNITS, 4 RUNS
–40°C ≤ T
A
≤ +85°C
00371-006
Figure 6. TCVOUT Distribution
00371-007
TEMPERATURE (°C)
100–50 –25 0 25 50 75
SUPPLY CURRENT (
μ
A)
40
35
30
25
20
15
10
5
0
NORMAL MODE
SLEEP MODE
Figure 7. Supply Current vs. Temperature
TEMPERATURE (°C)
100–50–250 255075
SLEEP PIN CURRENT (µA)
–
6
–5
–4
–3
–1
–2
0
V
L
V
H
00371-008
Figure 8. SLEEP Pin Current vs. Temperature
REF19x Series Data Sheet
Rev. L | Page 18 of 28
00371-009
FREQUENCY (Hz)
1M10 100 1k 10k 100k
RIPPLE REJECTION (dB)
–20
0
–60
–40
–80
–120
–100
Figure 9. Ripple Rejection vs. Frequency
REF19x
1kΩ
REF
10μF
VIN
= 15V OUTPUT
1kΩ
10μF
1μF10μF
2 6
4
00371-010
Figure 10. Ripple Rejection vs. Frequency Measurement Circuit
00371-011
FREQUENCY (Hz)
10M10 100 10k1k 100k 1M
Z
O
(Ω)
4
3
2
1
0
V
G
= 2V p-p
V
S
= 4V
V
IN
= 7V 200V
1μF1μF
REF19x
2 6
4
Z
Figure 11. Output Impedance vs. Frequency
O
FF
ON
100µs20mV
5V
10%
0%
90%
100%
00371-012
Figure 12. Load Transient Response
V
IN
= 15V
0
10mA
1μF
REF19x
4
2
6
00371-013
Figure 13. Load Transient Response Measurement Circuit
2V
2V
1mA
LOAD
30mA
LOAD
100µs
10%
100%
0%
90%
00371-014
Figure 14. Power-On Response Time
VIN = 7V 1μF
REF19x
4
2
6
00371-015
Figure 15. Power-On Response Time Measurement Circuit