SUPPLY VOLTAGE
MONITOR
ZSM530
ISSUE 2 – JANUARY 2003
DEVICE DESCRIPTION
FEATURES
The ZSM530 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device has been set to 4.3 volts
making it ideal for 5 volt circuits.
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Included in the device is a precise voltage
reference and a comparator with built in
hysteresis to prevent erratic operation. The
ZSM530 features an open collector output
capable of sinking at least l0mA which only
requires a single external resistor to interface
to following circuits.
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SOT223 and TO92 packages
Power on reset generator
Automatic reset generation
Low standby current
Guaranteed operation from 1 volt
Wide supply voltage range
Internal clamp diode to discharge delay
capacitor
4.3 volt threshold for 5 volt logic
20mV hysteresis prevents erratic operation
Operation of the device is guaranteed from
one volt upwards, from this level to the
device threshold voltage the output is held
low providing a power on reset function.
Should the supply voltage, once established,
at any time drop below the threshold level
then the output again will pull low.
APPLICATIONS
The device is available in a TO92 package for
through hole applications as well as SOT223
for surface mount requirements.
Automotive
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SCHEMATIC DIAGRAM
4-354
Microprocessor systems
Computers
Computer peripherals
Instrumentation
Battery powered equipment
ZSM530
ABSOLUTE MAXIMUM RATING
Input Supply Voltage
Offstate Output Voltage
Onstate Output
Sink Current(Note 1)
Clamp Diode
Forward Current(Note 1)
Operating Junction
Temperature
Operating Temperature
Storage Temperature
-1 to 10V
10V
Power Dissipation
TO92
SOT223
780mW
2W(Note 2)
Internally limited
100mA
150°C
-40 to 85°C
-55 to 150°C
TEST CONDITIONS
(Tamb=25°C for typical values, Tamb=-40 to 85°C for min/max values (Note3))
COMPARATOR
MIN
TYP.
MAX.
PARAMETER
SYMBOL
UNITS
Threshold Voltage
High state output (Vcc increasing)
VIH
4.2
4.31
4.4
V
Threshold Voltage
Low state output (Vcc decreasing)
VIL
4.2
4.29
4.4
V
Hysteresis
VH
0.01
0.02
0.05
V
(Vcc=3.8V, Isink=8.0mA)
0.46
1.0
V
(Vcc=3.8V, Isink=2.0mA)
0.15
0.4
V
0.25
V
27
60
mA
0.02
0.5
µA
1.2
1.5
V
OUPUT
Output sink saturation:
VOL
(Vcc=1.0V, Isink=0.1mA)
Onstate output sink current
(Vcc , Output=3.8V)
Isink
Offstate output leakage current
(Vcc , Output=5V)
Ioh
Clamp diode forward voltage
(If=10mA)
Vf
Propagation delay
(Vin 5V to 3.8V, Rl=10k, Tamb=25°C)
Td
10
0.6
µs
2
TOTAL DEVICE
Operating input voltage range
Vcc
Quiescent input current (Vcc=5V)
Iq
1.0 to 6.5
V
175
260
µA
Note:
1. Maximum package power dissipation must be observed.
2. Maximum power dissipation for the SOT223 package is calculated assuming that the device
is mounted on a PCB measuring 2 inches square.
3. Low duty cycle pulse techniques are used during test to maintain junction temperatures as
close to ambient as possible.
4-355
ZSM530
500
10
400
8
Output Voltage (V)
Input Current (µA)
TYPICAL CHARACTERISTICS
300
-40 °C 25 °C
85 °C
200
100
R A=10K
T A=25 °C
6
4
2
0
0
0
2
4
6
Input Voltage
8
10
0
10
(V)
Output Voltage vs. Input Voltage
Vin=4V
R L =10K
5
Vin (V)
40
Sink Current (mA)
8
6
Input Voltage
Input Current vs. Input Voltage
50
4
2
(V)
4
30
-40 °C
4
25 °C
20
Vout (V)
85 °C
10
2
0
0
0
0.4
0.8
1.2
1.6
0
2.0
1
Output Saturation Voltage vs. Sink Current
100
3
2
4
Time (µs)
Output Saturation Voltage (V)
Reset Delay Time
4.40
Vin=0V
80
Threshold Voltage (V)
Forward Current (mA)
4.35
60
85 °C
25 °C
40
-40 °C
20
0
Upper Threshold
4.30
Lower Threshold
4.25
4.20
0
0.4
0.8
1.2
1.6
2.0
-40
-20
0
20
40
60
80
Temperature (°C)
Forward Voltage (V)
Clamp Diode Forward Current vs. Voltage
Threshold Voltage vs. Temperature
4-356
100
ZSM530
TIMING DIAGRAM
Vcc
Threshold
Voltage
1V
Output
Output
Undefined
Output
Undefined
APPLICATION CIRCUIT
Note 4:
A time delayed reset can be accomplished with the additional Cd.
æ
T DY = RCd ln ç
ç
1
ç
è
−
1
ö
V TH ( mpu ) ÷÷
V in
÷
ø
TDY =Time (Seconds)
VTH =Microprocessor Reset Threshold
Vin =Power Supply Voltage
4-357
ZSM530
CONNECTION DIAGRAMS
SOT223
Package Suffix – G
TO92
Top View –
Pin 4 floating or connected to pin 2
Package Suffix – C
Bottom View
ORDERING INFORMATION
Part Number
Package
Part Mark
ZSM530G
SOT223
ZSM530
ZSM530C
TO92
ZSM530
4-358
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