SUPPLY VOLTAGE
MONITOR
ZSM330
ISSUE 1 – NOVEMBER 1995
DEVICE DESCRIPTION
FEATURES
The ZSM330 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device hasbeen set to 3.1 volts
making it ideal for 3.3 volt circuits.
SO8, SOT223 and TO92 packages
Power on reset generator
Automatic reset generation
Low standby current
•
•
•
•
•
•
•
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
ZSM330 features an open collector output
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
3.1 volt threshold for 3.3 volt logic
•
•
20mV 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
•
Computers
•
Computer peripherals
•
Instrumentation
•
Automotive
•
Battery powered equipment
•
The device is available in a TO92 package for
through hole applicationsaswell asSO8 and
SOT223 for surface mount requirements.
SCHEMATIC DIAGRAM
4-344
