SUPPLY VOLTAGE
MONITOR
ZM33164-3
ISSUE 2 – NOVEMBER 1995
DEVICE DESCRIPTION
FEATURES
The ZM33164-3 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device has been set to 2.68
volts making it ideal for 3 volt circuits.
SO8, SOT223 and TO92 packages
Power on reset generator
Automatic reset generation
Low standby current
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Guaranteed operation from 1 volt
Wide supply voltage range
Included in the device is a precise voltage
reference and a comparator with built in
hysteresis to prevent erratic operation. The
ZM33164-3 featuresan open collectoroutput
capable of sinking at least l0mA which only
requires a single external resistor to
interface to following circuits.
Internal clamp diode to discharge delay
capacitor
2.68 volt threshold for 3 volt logic
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60mV hysteresis prevents erratic operation
APPLICATIONS
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.
Shouldthesupplyvoltage, onceestablished,
at any time drop below the threshold level
then the output again will pull low.
Microprocessor systems
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Computers
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Computer peripherals
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Instrumentation
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Automotive
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Battery powered equipment
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The device is available in a TO92 package for
through hole applicationsaswell asSO8 and
SOT223 for surface mount requirements.
SCHEMATIC DIAGRAM
4-99
