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ZSM530CSTZ

P1-P3P4-P5
SUPPLY VOLTAGE
MONITOR
ISSUE 2 – JANUARY 2003
ZSM530
DEVICE DESCRIPTION
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.
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.
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.
The device is available in a TO92 package for
through hole applications as well as SOT223
for surface mount requirements.
FEATURES
•
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
APPLICATIONS
•
Microprocessor systems
•
Computers
•
Computer peripherals
•
Instrumentation
•
Automotive
•
Battery powered equipment
SCHEMATIC DIAGRAM
4-354
TEST CONDITIONS
(T
amb
=25°C for typical values, T
amb
=-40 to 85°C for min/max values (Note3))
COMPARATOR
PARAMETER SYMBOL
MIN TYP. MAX.
UNITS
Threshold Voltage
High state output (V
cc
increasing) V
IH
4.2 4.31 4.4 V
Threshold Voltage
Low state output (V
cc
decreasing) V
IL
4.2 4.29 4.4 V
Hysteresis V
H
0.01 0.02 0.05 V
OUPUT
Output sink saturation: V
OL
(V
cc
=3.8V, I
sink
=8.0mA) 0.46 1.0 V
(V
cc
=3.8V, I
sink
=2.0mA) 0.15 0.4 V
(V
cc
=1.0V, I
sink
=0.1mA) 0.25 V
Onstate output sink current
(V
cc
, Output=3.8V)
I
sink
10 27 60 mA
Offstate output leakage current
(V
cc
, Output=5V)
I
oh
0.02 0.5
µA
Clamp diode forward voltage
(I
f
=10mA)
V
f
0.61.21.5V
Propagation delay
(V
in
5V to 3.8V, R
l
=10k, T
amb
=25°C)
T
d
2
µs
TOTAL DEVICE
Operating input voltage range V
cc
1.0 to 6.5 V
Quiescent input current (V
cc
=5V) I
q
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.
ZSM530
ABSOLUTE MAXIMUM RATING
Input Supply Voltage -1 to 10V
Offstate Output Voltage 10V
Onstate Output
Sink Current(
Note 1) Internally limited
Clamp Diode
Forward Current(
Note 1) 100mA
Operating Junction
Temperature 150°C
Operating Temperature -40 to 85°C
Storage Temperature -55 to 150°C
Power Dissipation
TO92 780mW
SOT223 2W(
Note 2)
4-355
0246810
-40 °C
25 °C 85 °C
100
200
400
300
500
02
0 0.8 1.6 2.00.4 1.2
0
20
40
50
Sink Current (mA)
-40 °C
25 °C
85 °C
00.4 2.00.8 1.2 1.6
0
40
60
80
20
-40 °C
85 °C
25 °C
46
810
2
4
6
8
10
0
Output Voltage (V)
0
1
2
3
4
2
4
0
Vin (V)
4
5
-40
-20
020
40 60
80
4.25
4.20
Te mper a t ure (°C)
Forward Voltage (V)
Threshold Voltage (V)
Forward Current (mA)
Input Current (
µ
A)
Input Voltage
Upper Threshold
Lower Threshold
Input Current vs. Input Voltage
Output Voltage vs. Input Voltage
Output Saturation Voltage vs. Sink Current Reset Delay Time
Clamp Diode Forward Current vs. Voltage Threshold Voltage vs. Temperature
Input Voltage
Output Saturation Voltage (V)
Vout (V)
(V)
(V)
Time (
µ
s)
0
30
10
100
100
4.30
4.35
4.40
R
A
=10K
T
A=25 °C
R
L
=10K
Vin=4V
V
in=0V
ZSM530
TYPICAL CHARACTERISTICS
4-356
P1-P3P4-P5

ZSM530CSTZ

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Description:
IC MONITOR SUPPLY 4.3V TO92-3
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