ZXCM209
ZXCM210
VERY LOW POWER MICROPROCESSOR RESET DEVICES
DESCRIPTION
APPLICATIONS
The ZXCM209/210 are three term inal supervisory
circuits used to m onitor the power supplies in
m icroprocessor and digital system s. They provide a
high perform ance econom ical solution when used
w ith 5V, 3V o r lo w e r p o w e re d circu its . Re s e t
thresholds suitable for operation with a variety of
supply voltages are available.
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Com puter system s
Controllers
Instrum entation
Microprocessor power m onitoring
Microcontroller power m onitoring
Power supplies
These devices provide a reset signal whenever the
supply voltage falls below a preset threshold, keeping
it asserted for a m inim um delay period of 140m s after
the supply has risen above the reset level. The
ZXCM209 has an active-low RESET output (which is
guaranteed to be in the correct state for supplies down
to 1V), while the ZXCM210 has an active-high RESET
output.
Portable/Battery-powered equipm ent
Autom otive
APPLICATION CIRCUIT
vcc
The reset com parator has in built hysteresis to prevent
erratic operation and is designed to ignore supply
transients. Low supply current (typically 2µA) m akes
the ZXCM209/210 devices ideal for use in portable
equipm ent. They are available in a 3-pin SOT23
surface m ount package with an industry standard
pinout.
vcc
vcc
ZXCM
Micro
Reset
Output
Reset
Input
FEATURES
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Enhanced alternative to MAX809/810 and sim ilar
parts
Gnd
Gnd
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Precision m onitoring of 5V, 3.3V, 3V power
supply voltages
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1% threshold tolerance
2µA typical supply current
140m s m inim um power on reset pulse width
Alternative m inim um pulse widths available,
contact your local sales office for availability
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RESET LOW Output (ZXCM209)
RESET HIGH Output (ZXCM210)
Power supply transient im m unity
No latch up
No external com ponents
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3-Pin SOT23 package
ISSUE 2 - MARCH 2000
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