SUPPLY VOLTAGE
MONITOR
ZSM380
ISSUE 3 – JULY 2006
DEVICE DESCRIPTION
FEATURES
The ZSM380 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device has been set to 3.8 volts
making it ideal for 5 volt circuits.
SOT223 and TO92 packages
Power on reset generator
Automatic reset generation
Low standby current
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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
ZSM380 features an open collector output
capable of sinking at least l0mA which only
requires a single external resistor to
interface to following circuits.
Guaranteed operation from 1 volt
Wide supply voltage range
Internal clamp diode to discharge
delay capacitor
3.8 volt threshold for 5 volt logic
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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
Microprocessor systems
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Computers
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Computer peripherals
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Instrumentation
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Automotive
The device is available in a TO92 package for
through hole applications as well as SOT223
for surface mount requirements.
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Battery powered equipment
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SCHEMATIC DIAGRAM
4-349
Issue 3 - July 2006
© Zetex Semiconductors plc 2006
