UNISONIC TECHNOLOGIES CO., LTD
UIC811 CMOS IC
www.unisonic.com.tw 1 of 8
Copyright © 2012 Unisonic Technologies Co., Ltd QW-R502-317.K
MICROPROCESSOR RESET
CIRCUITS
DESCRIPTION
The UTC UIC811 series are resetting circuits which can monitor
power supplies especially in microprocessor based systems.
In normal operation, the UTC UIC811 series can assert a reset
under any of the following situation: the power supply drops below
a designated reset threshold level (which is available for 3V or 3.3V
or 5V system) or MR is forced low.
There is an internal active low RESET output which has already
been guaranteed to remain asserted for at 140ms least while VCC
rises above the designed threshold level.
FEATURES
* Voltage monitor for 3V or 3.3V or 5V power supplies
* Valid RESET remains with VCC as low as 1V
* Typical supply current: 5µA
* Fixed 140ms minimum reset pulse width
* With Manual reset input
ORDERING INFORMATION
Ordering Number Package Pin Assignment Packing
Lead Free Halogen Free 1 2 3 4
UIC811L-x-AD4-R UIC811G-x-AD4-R SOT-143 GND RESET MR VCC Tape Reel
UIC811L-x-AL4-R UIC811G-x-AL4-R SOT-343 GND RESET MR VCC Tape Reel
UIC811L-x-AE2-2-R UIC811G-x-AE2-2-R SOT-23-3 VCC RESET GND - Tape Reel
UIC811L-x-AE2-3-R UIC811G-x-AE2-3-R SOT-23-3
RESET GND VCC - Tape Reel
UIC811L-x-AE3-2-R UIC811G-x-AE3-2-R SOT-23 VCC RESET GND - Tape Reel
UIC811L-x-AE3-3-R UIC811G-x-AE3-3-R SOT-23
RESET GND VCC - Tape Reel
Note: Pin Assignment : x: Output Voltage, refer to Marking Information.
UIC811 CMOS IC
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MARKING INFORMATION
PACKAGE VOLTAGE CODE MARKING
SOT-143
A : 2.63V
B : 2.93V
C : 3.08V
D: 4.00V
E: 4.38V
F: 5.00V
SOT-343
SOT-23
SOT-23-3
3
UX
12
G: Halogen Free
L: Lead Free
Voltage Code Pin Code
PIN CONFIGURATION
SOT-143 SOT-343 SOT-23-3/SOT-23
AE2-2/AE3-2 AE2-3/AE3-3
PIN DESCRIPTION
PIN
NAME DESCRIPTION
GND Ground
RESET
T
his pin will fall low after the VCC’s falling below the reset threshold voltage and it also can remain asserte
d
f
or at least 140ms min afte
r
VCC’s rising upon the reset threshold.
MR
Input of manual reset. A reset can be forced b
y
a logic low on MR . As the MR is held low, the reset will
remain asserted, and until the MR rise high, the reset will remain 140ms min at least. When it is float tha
t
means it is unused. For SOT-143 and SOT-343 only.
VCC Input of power supply.
UIC811 CMOS IC
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BLOCK DIAGRAM
VCC
MR GND
RESET
RESET
GENERATOR
Reset
Threshold
4
31
2
FUNCTIONAL DIAGRAM
VTH
tRST
Reset Timing Diagram
tRST
VCC
MR
RESET
UIC811 CMOS IC
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ABSOLUTE MAXIMUM RATING
PARAMETER SYMBOL RATINGS UNIT
Input Voltage VCC -0.3~+6.0 V
Input Current (VCC,MR ) IIN 20 mA
Output Current ( RESET ) IOUT 20 mA
Rate of Rise VCC
(
RR
)
100 V/µs
Power Dissipation
(TA =+70°C)
SOT-143
PD
320
mW SOT-343
SOT-23/SOT-23-3 300
Operating Temperature TOPR -40~+105 °C
Storage Temperature TSTG -65~+150 °C
Note: 1.
Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2.
The device is not
g
uaranteed to function outside its o
p
eratin
g
ratin
g
.
ELECTRICAL CHARACTERISTICS
UIC811-A (2.63V) (VCC =3V, TA = 25°C, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Voltage Range VCC T
A=-40~+85°C 1 6 V
Supply Current ICC V
CC=3.0V, no load 5 10 µA
Reset Voltage Threshold VTH 2.55 2.63 2.70 V
Reset Timeout Period tRST 140 240 560 ms
Reset Output Voltage
VOH I
SOURCE =500µA 2.4 V
VOL VCC = VTH min, ISINK =1.2mA 0.3 V
VCC>1V, ISINK =50µA, TA=-40~+85°C 0.3 V
MR Input Threshold VIH 2.1 V
VIL 0.75 V
MR Minimum Pulse Width 10 µS
MR to Reset Delay 0.5 µS
MR Pull-Up Resistance 10 20 30 kΩ
MR Glitch Immunity 100 ns
UIC811-B (2.93V) (VCC =3.3V, TA= 25°C, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Voltage Range VCC T
A=-40~+85°C 1 6 V
Supply Current ICC V
CC=3.3V, no load 5 10 µA
Reset Voltage Threshold VTH 2.85 2.93 3.00 V
Reset Timeout Period tRST 140 240 560 ms
Reset Output Voltage
VOH I
SOURCE =500µA 2.64 V
VOL VCC = VTH min, ISINK =1.2mA 0.3 V
VCC>1V, ISINK =50µA, TA=-40~+85°C 0.3 V
MR Input Threshold VIH 2.31 V
VIL 0.825 V
MR Minimum Pulse Width 10 µS
MR to Reset Delay 0.5 µS
MR Pull-Up Resistance 10 20 30 kΩ
MR Glitch Immunity 100 ns
UIC811 CMOS IC
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ELECTRICAL CHARACTERISTICS(Cont.)
UIC811-C (3.08V) (VCC =3.3V, TA= 25°C, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Voltage Range VCC T
A=-40~+85°C 1 6 V
Supply Current ICC V
CC=3.3V, no load 5 10 µA
Reset Voltage Threshold VTH 3.00 3.08 3.15 V
Reset Timeout Period tRST 140 240 560 ms
Reset Output Voltage
VOH I
SOURCE =500µA 2.64 V
VOL VCC = VTH min, ISINK =1.2mA 0.3 V
VCC>1V, ISINK =50µA, TA=-40~+85°C 0.3 V
MR Input Threshold VIH 2.31 V
VIL 0.825 V
MR Minimum Pulse Width 10 µS
MR to Reset Delay 0.5 µS
MR Pull-Up Resistance 10 20 30 kΩ
MR Glitch Immunity 100 ns
UIC811-D (4.00V) (VCC =5V, TA= 25°C, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Voltage Range VCC T
A=-40~+85°C 1 6 V
Supply Current ICC V
CC=5.0V, no load 5 15 µA
Reset Voltage Threshold VTH 3.89 4.00 4.10 V
Reset Timeout Period tRST 140 240 560 ms
Reset Output Voltage
VOH I
SOURCE =800µA 3.5 V
VOL VCC = VTH min, ISINK =3.2mA 0.4 V
VCC>1V, ISINK =50µA, TA =-40~+85°C 0.3 V
MR Input Threshold VIH 2.3 V
VIL 0.8 V
MR Minimum Pulse Width 10 µS
MR to Reset Delay 0.5 µS
MR Pull-Up Resistance 10 20 30 kΩ
MR Glitch Immunity 100 ns
UIC811-E (4.38V) (VCC =5V, TA= 25°C, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Voltage Range VCC T
A=-40~+85°C 1 6 V
Supply Current ICC V
CC=5.0V, no load 5 15 µA
Reset Voltage Threshold VTH 4.25 4.38 4.50 V
Reset Timeout Period tRST 140 240 560 ms
Reset Output Voltage
VOH I
SOURCE =800µA 3.5 V
VOL VCC = VTH min, ISINK =3.2mA 0.4 V
VCC>1V, ISINK =50µA, TA=-40~+85°C 0.3 V
MR Input Threshold VIH 2.3 V
VIL 0.8 V
MR Minimum Pulse Width 10 µS
MR to Reset Delay 0.5 µS
MR Pull-Up Resistance 10 20 30 kΩ
MR Glitch Immunity 100 ns
UIC811 CMOS IC
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ELECTRICAL CHARACTERISTICS(Cont.)
UIC811-F (5.0V) (VCC =5.5V, TA= 25°C, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Operating Voltage Range VCC T
A=-40~+85°C 1 6 V
Supply Current ICC V
CC=5.0V, no load 25 µA
Reset Voltage Threshold VTH 4.85 5 5.15 V
Reset Timeout Period tRST 140 240 560 ms
Reset Output Voltage
VOH I
SOURCE =800µA 4.55 V
VOL VCC = VTH min, ISINK =3.2mA 0.4 V
VCC>1V, ISINK =50µA, TA
=-40~+85°C 0.3 V
MR Input Threshold VIH 2.45 V
VIL 0.8 V
MR Minimum Pulse Width 10 µS
MR to Reset Delay 0.5 µS
MR Pull-Up Resistance 10 20 30 kΩ
MR Glitch Immunity 100 ns
UIC811 CMOS IC
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TYPICAL APPLICATION CIRCUIT
UTC
UIC811
VCC
RESET
MR
µP
VCC
RESET
VCC
APPLICATION INFORMATIO N
Microprocessor Reset
As soon as VCC falls below the reset threshold voltage, the RESET pin is asserted. But the RESET pin can
keep asserted for a period of 140ms after VCC rose above the reset threshold voltage. After a power failure the reset
operation can keep the processor being reset and powers up properly.
VCC Transients
The UTC UIC811 series won’t cause a reset typically as this situation: a negative-going transient 125mV below
the reset threshold with a duration of 20µs or less.
Interfacing to Bidirectional Reset Pins
Connecting a 4.7kΩ resistor in series with the UTC UIC811 series output and the µP reset pin can make the
UTC UIC811 series interface with µPs with bidirectional reset pins.
RESET Valid at Low Voltage
As the figure below, adding a resistor which is recommended 100kΩ can ensure the RESET output remains
low with VCC down to 0V. The size of the resistor should be not too large which will load the output excessively and
not too small which can pull-down any stray leakage currents.
UIC811 CMOS IC
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TYPICAL CHARACTERISTICS
Reset Timeout out Period Reset Timeout out Period
MR to Reset Delay
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
CH1：MR
CH2：Reset
CH1：VCC
CH2：Reset
CH1：MR
CH2：Reset
