P
RODUCTION
D
ATA
S
HEET
T
HE
I
NFINITE
P
OWER OF
I
NNOVATION
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861
W
ESTERN
A
VENUE
,
G
ARDEN
G
ROVE
,
CA.
92841,
714-898-8121,
F
AX
:
714-893-2570
1
Copyright © 1997
Rev. 1.5a,2005-03-09
MC33164 / MC34164
5V
U
NDERVOLTAGE
S
ENSING
C
IRCUIT
DESCRIPTION
The MC33164 and the MC34164 are
micropower undervoltage sensing circuits
ideal for use in low-power battery
applications, computer peripheral,
consumer, appliance and automotive
equipment. The device offers a 1.2V
temperature compensated bandgap
reference, a precision comparator with
hysteresis and a high current open collector
output. This device operates from 1 to
10V input supply and drains <10µA in a
faultless condition and a trip level of
4.33V. Both devices are available in an 8-
pin, 150mil SOIC package and a plastic
TO-92 package. The MC33164 is rated
from -40°C to 85°C and the MC34164
from 0°C to 70°C.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
L
OW
-V
OLTAGE
M
ICROPROCESSOR
R
ESET
POWER
SUPPLY
1.2 V
REF
MICROPROCESSO
R
CIRCUIT
RESET
C
DLY
R
2
1
3
KEY FEATURES
LOW STANDBY CURRENT
TEMPERATURE
COMPENSATED BANDGAP
REFERENCE
PRECISION COMPARATOR
WITH 50MV OF
HYSTERESIS
CLAMP DIODE FOR
DISCHARGING DELAY
CAPACITOR
OUTPUT CURRENT SINK
CAPABILITY FROM 7 TO
50MA
1-10V INPUT SUPPLY
RANGE
AVAILABLE IN 150MIL, 8-
PIN SOIC AND PLASTIC
TO-92 PACKAGES
PIN-FOR-PIN COMPATIBLE
WITH MC33164 / 34164
APPLICATIONS
µPOWER RESET
GENERATOR
5V VOLTAGE MONITOR
BATTERY-LEVEL
DETECTOR
PACKAGE ORDER INFO
DM
Plastic SOIC
8-Pin
LP
Plastic TO-92
3-Pin
T
A
(°C)
RoHS Compliant / Pb-free
Transition DC: 0440 RoHS Compliant / Pb-free
Transition DC: 0509
0 to 70 MC34164DM MC34164LP
-40 to 85 MC33164DM MC33164LP
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e.
MC33164DM-TR)
5V U
NDERVOLTAGE
S
ENSING
C
IRCUIT
MC33164/MC34164
PRODUCT DATABOOK 1996/1997
Copyright © 1997
Rev. 1.5a 9/17/2004
2
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN)............................................................................... -1V to 12V
RESET Output Voltage (VOUT
) .......................................................................... -1V to 12V
Clamp Diode Forward Current .............................................................................. 100mA
Operating Junction Temperature
Plastic (DM - Package) ......................................................................................... 150°C
Storage Temperature Range...................................................................... -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) ............................................................ 300°C
PACKAGE PIN OUTS
RESET
INPUT
N.C.
GROUND
N.C.
N.C.
N.C.
N.C.
DM PACKAGE
(Top View)
Note 1. Values beyond which damage may occur. All voltages are specified with respect to
ground, and all currents are positive into the specified terminal.
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θθ
θθ
θJA 165°C/W
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θθ
θθ
θJA 156°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
THERMAL DATA
BLOCK DIAGRAM
LP PACKAGE
(Top View)
3. GROUND
2. INPUT
1. RESET
1.2 V
REF
INPUT
RESET
GROUND
2(2)
1(1)
4(3)
1 8
2 7
3 6
4 5
Peak Package Solder Reflow Temp.(40 second max. exposure)......................................260°C (+0, -5) RoHS / Pb-free 100% Matte Tin Lead Finish
5V UNDERVOLTAGE SENSING CIRCUIT
MC33164/MC34164
PRODUCT DATABOOK 1996/1997
3
Copyright © 1997
Rev. 1.5a 9/17/2004
PRODUCTION DATA SHEET
Input Supply Voltage
RESET Output Voltage
Clamp Diode Forward Current
Operating Ambient Temperature Range:
MC34164 TA
MC33164 TA
RECOMMENDED OPERATING CONDITIONS (Note 2)
Parameter
Symbol
Units
Recommended Operating Conditions
Min. Typ. Max.
110V
10 V
50 mA
070°C
-40 85 °C
Note 2. Range over which the device is guaranteed functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0°C ≤ TA ≤ 70°C for the MC34164 and -40°C ≤ TA ≤ 85°C
for the MC33164. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Symbol
Test Conditions Units
Comparator Section
4.15 4.33 4.45 V
4.15 4.27 4.45 V
0.02 0.06 V
Threshold Voltage
High-State Output VIH VIN Increasing
Low-State Output VIL VIN Decreasing
Hysteresis VH
0.05 0.40 V
0.06 0.30 V
7.0 50 mA
0.5 µA
2.0 µA
0.6 1.2 V
Output Sink Saturation VOL VIN = 4.0V, ISINK = 1.0mA
VIN = 1.0V, ISINK = 0.25mA
Output Sink Current ISINK VIN , RESET = 4.0V
Output Off-State Leakage VIN , RESET = 5.0V
VIN , RESET = 10V
Clamp Diode Forward Voltage VFPin 1 to pin 2, (IF = 5.0mA)
RESET Output Section
MC33164 / MC34164
Min. Typ. Max.
Total Device
1.0 10 V
10 20 µA
19 50 µA
Operating Input Voltage Range VIN
Quiescent Input Current IIN VIN = 5.0V
VIN = 10V
5V U
NDERVOLTAGE
S
ENSING
C
IRCUIT
MC33164/MC34164
PRODUCT DATABOOK 1996/1997
Copyright © 1997
Rev. 1.5a 9/17/2004
4
PRODUCTION DATA SHEET
GRAPH / CURVE INDEX
Characteristic Curves
FIGURE #
1. COMPARATOR THRESHOLD VOLTAGE vs. TEMPERATURE
2. RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
3. RESET OUTPUT SATURATION vs. SINK CURRENT
4. INPUT CURRENT vs. INPUT VOLTAGE
5. RESET DELAY TIME (LOW to HIGH)
6. RESET DELAY TIME (HIGH to LOW)
FIGURE INDEX
Application Circuits
FIGURE #
7. SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V
8. LOW VOLTAGE MICROPROCESSOR RESET
9. VOLTAGE MONITOR
10. MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
5V UNDERVOLTAGE SENSING CIRCUIT
MC33164/MC34164
PRODUCT DATABOOK 1996/1997
5
Copyright © 1997
Rev. 1.5a 9/17/2004
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 2. — RESET OUTPUT VOLTAGE
vs. INPUT VOLTAGE
FIGURE 3. — RESET OUTPUT SATURATION
vs. SINK CURRENT
FIGURE 4. — INPUT CURRENT vs. INPUT VOLTAGE
FIGURE 1. — COMPARATOR THRESHOLD VOLTAGE
vs. TEMPERATURE
Junction Temperature - (°C)
Threshold Voltage - (V)
4.15
-50 -25 0 25 50 75 100 125
4.20
4.25
4.30
4.35
4.40
4.45
Upper Threshold
High State Output
Lower Threshold
Low State Output
R
L
= 43K to V
IN
0
0
(I
SINK
) Sink Current - (mA)
(V
OL
) Output Saturation - (mV)
100
3
V
IN
= 4V
T
A
= 25°C
6 9 12 14
200
300
400
500
0
0
Input Voltage - (V)
Input Current - (µA)
20
2
140
40
60
80
100
120
46 81012
R
L
= ¥
T
A
= 25°C
0
0
Input Voltage - (V)
Output Voltage - (V)
2.0
2.0
R
L
= 82K to V
IN
T
A
= 25°C
4.0 6.0 8.0 10
4.0
6.0
8.0
10
5V U
NDERVOLTAGE
S
ENSING
C
IRCUIT
MC33164/MC34164
PRODUCT DATABOOK 1996/1997
Copyright © 1997
Rev. 1.5a 9/17/2004
6
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES
FIGURE 6. — RESET DELAY TIME (HIGH TO LOW)
FIGURE 5. — RESET DELAY TIME (LOW TO HIGH)
0%
2µs/DIV.
REF
43K
RESET
5V
4V
V
IN
5V
4V
V
IN
= 4.0V to 5.0V
R
L
= 43K
T
A
= 25°C
100%
0%
0.5µs/DIV.
REF
43K
RESET
5V
4V
V
IN
5V
4V
V
IN
= 4.0V to 5.0V
R
L
= 43K
T
A
= 25°C
100%
5V UNDERVOLTAGE SENSING CIRCUIT
MC33164/MC34164
PRODUCT DATABOOK 1996/1997
7
Copyright © 1997
Rev. 1.5a 9/17/2004
PRODUCTION DATA SHEET
TYPICAL APPLICATION CIRCUITS
FIGURE 8. — LOW-VOLTAGE MICROPROCESSOR RESET
POWER
SUPPLY
1.2 V
REF
RESET
2
1.0k
1
3
FIGURE 9. — VOLTAGE MONITOR
FIGURE 7. — SWITCHING THE LOAD OFF WHEN
BATTERY VOLTAGE REACHES BELOW 4.3V
A time delayed reset can be accomplished with the addition of CDLY.
For systems with extremely fast power supply rise times (< 500ns) it
is recommended that the RCDLY time constant be greater than 5.0µs.
VTH(MPU) is the microprocessor reset input threshold.
POWER
SUPPLY
1.2 V
REF
MICROPROCESSOR
CIRCUIT
RESET
C
DLY
R
2
1
3
1.2 V
REF
LOAD
RESET
2
4
1
1.2 V
REF
2
270
4.3V
V
CC
R
L
SMP60N03-10L
1
3
FIGURE 10. — MOSFET LOW-VOLTAGE GATE DRIVE PROTECTION
Overheating of the logic level power MOSFET due to insufficient
gate voltage can be prevented with the above circuit. When the
input signal is below the 4.3 volt threshold of the MC34164, its
output grounds the gate of the L2 MOSFET.
tDLY = R CDLY In VTH(MPU)
VIN
1 -
1
