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LIN DOC #: 33164
MC33164/MC34164
5V UN D E RV O LTAGE SENSING CI R C U I T
T
HE
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RODUCTION
D
ATA
S
HEET
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 <10A in the nonfault condition and 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 -40C to 85C and the MC34164 from 0C to 70C.
K E Y F E AT U R E S
s LOW STANDBY CURRENT s TEMPERATURE COMPENSATED BANDGAP REFERENCE s PRECISION COMPARATOR WITH 50MV OF HYSTERESIS s CLAMP DIODE FOR DISCHARGING DELAY CAPACITOR s OUTPUT CURRENT SINK CAPABILITY FROM 7 TO 50MA s 1-10V INPUT SUPPLY RANGE s AVAILABLE IN 150MIL, 8-PIN SOIC AND PLASTIC TO-92 PACKAGES s PIN-FOR-PIN COMPATIBLE WITH MC33164/ 34164
PRODUCT HIGHLIGHT
LOW-VOLTAGE MICROPROCESSOR RESET
APPLICATIONS
2 1 POWER SUPPLY R RESET CDLY MICROPROCESSOR CIRCUIT
s POWER RESET GENERATOR s 5V VOLTAGE MONITOR s BATTERY-LEVEL DETECTOR
1.2 VREF
3
PA C K A G E O R D E R I N F O R M AT I O N T A (C) 0 to 70 -40 to 85
DM Plastic SOIC 8-pin
MC34164DM MC33164DM
LP Plastic TO-92 3-pin
MC34164LP MC33164LP
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. MC34164DMT)
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright (c) 1997 Rev. 1.5 11/97
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
PRODUCT DATABOOK 1996/1997
MC33164/MC34164
5 V U N D E RV O LTA G E SE N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
RESET INPUT N.C. GROUND 1 2 3 4 8 7 6 5 N.C. N.C. N.C. N.C.
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) ......................................................................................... 150C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature (Soldering, 10 seconds) ............................................................ 300C
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 (Top View)
3. GROUND
T H E R M A L D ATA
DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA LP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 156C/W Junction Temperature Calculation: TJ = T A + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. 165C/W
2. INPUT 1. RESET
LP PACKAGE (Top View)
BLOCK DIAGRAM
INPUT 2(2) RESET 1(1)
1.2 VREF
4(3) GROUND
2
Copyright (c) 1997 Rev. 1.5 11/97
PRODUCT DATABOOK 1996/1997
MC33164/MC34164
5V UN D E RV O LTAGE SENSING CI R C U I T
P
RODUCTION
D
ATA
S
HEET
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter
Input Supply Voltage RESET Output Voltage Clamp Diode Forward Current Operating Ambient Temperature Range: MC34164 MC33164 Note 2. Range over which the device is guaranteed functional.
(Note 2)
Symbol
Recommended Operating Conditions Min. Typ. Max.
1 10 10 50 70 85
Units
V V mA C C
TA TA
0 -40
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0C TA 70C for the MC34164 and -40C TA 85C for the MC33164. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter Total Device
Operating Input Voltage Range Quiescent Input Current
Symbol
Test Conditions
MC33164 / MC34164 Min. Typ. Max.
1.0 10 20 50
Units
VIN IIN
VIN = 5.0V VIN = 10V
10 19
V A A
Comparator Section
Threshold Voltage High-State Output Low-State Output Hysteresis VIH VIL VH VOL ISINK VIN Increasing VIN Decreasing 4.15 4.15 0.02 4.33 4.27 0.06 0.05 0.06 7.0 4.45 4.45 V V V V V mA A A V
RESET Output Section
Output Sink Saturation Output Sink Current Output Off-State Leakage Clamp Diode Forward Voltage VIN = 4.0V, ISINK = 1.0mA VIN = 1.0V, ISINK = 0.25mA VIN , RESET = 4.0V VIN , RESET = 5.0V VIN , RESET = 10V Pin 1 to pin 2, (IF = 5.0mA) 0.40 0.30 50 0.5 2.0 1.2
VF
0.6
Copyright (c) 1997 Rev. 1.5 11/97
3
PRODUCT DATABOOK 1996/1997
MC33164/MC34164
5 V U N D E RV O LTA G E SE N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
FIGURE # 1. 2. 3. 4. 5. 6. COMPARATOR THRESHOLD VOLTAGE vs. TEMPERATURE RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE RESET OUTPUT SATURATION vs. SINK CURRENT INPUT CURRENT vs. INPUT VOLTAGE RESET DELAY TIME (LOW to HIGH) RESET DELAY TIME (HIGH to LOW) FIGURE # 7. 8. 9.
Application Circuits
SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V LOW VOLTAGE MICROPROCESSOR RESET VOLTAGE MONITOR
10. MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
4
Copyright (c) 1997 Rev. 1.5 11/97
PRODUCT DATABOOK 1996/1997
MC33164/MC34164
5V UN D E RV O LTAGE SENSING CI R C U I T
P
RODUCTION
D
ATA
S
HEET
C H A R A C T E R I S T I C C U RV E S
FIGURE 1. -- COMPARATOR THRESHOLD VOLTAGE vs. TEMPERATURE
RL = 43K to VIN
4.45
FIGURE 2. -- RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
10
8.0
Threshold Voltage - (V)
4.40 4.35 4.30 4.25 4.20 4.15
0
RL = 82K to VIN TA = 25C
Upper Threshold High State Output
Output Voltage - (V)
6.0
Lower Threshold Low State Output
4.0
2.0
-50
-25
0
25
50
75
100
125
0
2.0
4.0
6.0
8.0
10
Junction Temperature - (C)
Input Voltage - (V)
FIGURE 3. -- RESET OUTPUT SATURATION vs. SINK CURRENT
500
FIGURE 4. -- INPUT CURRENT vs. INPUT VOLTAGE
140
(VOL) Output Saturation - (mV)
400
VIN = 4V TA = 25C
RL = TA = 25C
120
Input Current - (A)
0 3 6 9 12 14
300
100 80 60 40 20
200
100
0
0 0 2 4 6 8 10 12
(ISINK) Sink Current - (mA)
Input Voltage - (V)
Copyright (c) 1997 Rev. 1.5 11/97
5
PRODUCT DATABOOK 1996/1997
MC33164/MC34164
5 V U N D E RV O LTA G E SE N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC CURVES
FIGURE 5. -- RESET DELAY TIME (LOW TO HIGH)
FIGURE 6. -- RESET DELAY TIME (HIGH TO LOW)
VIN 5V 4V 43K RESET
VIN 5V 4V 43K RESET
REF
REF
100% 5V
100% 5V
4V
4V
0%
VIN = 4.0V to 5.0V RL = 43K TA = 25C
0%
VIN = 4.0V to 5.0V RL = 43K TA = 25C
2s/DIV.
0.5s/DIV.
6
Copyright (c) 1997 Rev. 1.5 11/97
PRODUCT DATABOOK 1996/1997
MC33164/MC34164
5V UN D E RV O LTAGE SENSING CI R C U I T
P
RODUCTION
D
ATA
S
HEET
T Y P I C A L A P P L I C AT I O N C I R C U I T S
2 1 POWER SUPPLY
R RESET CDLY MICROPROCESSOR CIRCUIT
2 1 RESET
LOAD
1.2 VREF
3
1.2 VREF
4
A time delayed reset can be accomplished with the addition of C DLY. For systems with extremely fast power supply rise times (< 500ns) it is recommended that the RC DLY time constant be greater than 5.0s. VTH(MPU) is the microprocessor reset input threshold.
tDLY = R CDLY In
1 VTH(MPU) 1- V IN
FIGURE 7. -- SWITCHING THE LOAD OFF WHEN BATTERY VOLTAGE REACHES BELOW 4.3V
FIGURE 8. -- LOW-VOLTAGE MICROPROCESSOR RESET
VCC 270 RL SMP60N03-10L
4.3V
1.0k 2 1 POWER SUPPLY RESET
2 1
1.2 VREF
1.2 VREF
3
3
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. FIGURE 10. -- MOSFET LOW-VOLTAGE GATE DRIVE PROTECTION
FIGURE 9. -- VOLTAGE MONITOR
Copyright (c) 1997 Rev. 1.5 11/97
7

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