ZXCM209 Datasheet, PDF (1/8 Pages) Zetex Semiconductors – VERY LOW POWER MICROPROCESSOR RESET DEVICES

VERY LOW POWER MICROPROCESSOR RESET DEVICES
ZXCM209
ZXCM210
DESCRIPTION
The ZXCM209/210 are three terminal supervisory
circuits used to monitor the power supplies in
microprocessor and digital systems. They provide a
high performance economical solution when used
with 5V, 3V or lower powered circuits. Reset
thresholds suitable for operation with a variety of
supply voltages are available.
These devices provide a reset signal whenever the
supply voltage falls below a preset threshold, keeping
it asserted for a minimum delay period of 140ms 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.
The reset comparator has in built hysteresis to prevent
erratic operation and is designed to ignore supply
transients. Low supply current (typically 2µA) makes
the ZXCM209/210 devices ideal for use in portable
equipment. They are available in a 3-pin SOT23
surface mount package with an industry standard
pinout.
FEATURES
• Enhanced alternative to MAX809/810 and similar
parts
• Precision monitoring of 5V, 3.3V, 3V power
supply voltages
• 1% threshold tolerance
• 2µA typical supply current
• 140ms minimum power on reset pulse width
• Alternative minimum pulse widths available,
contact your local sales office for availability
• RESET LOW Output (ZXCM209)
• RESET HIGH Output (ZXCM210)
• Power supply transient immunity
• No latch up
• No external components
• 3-Pin SOT23 package
APPLICATIONS
• Computer systems
• Controllers
• Instrumentation
• Microprocessor power monitoring
• Microcontroller power monitoring
• Power supplies
• Portable/Battery-powered equipment
• Automotive
APPLICATION CIRCUIT
v_cc
v_cc
ZXCM
Reset
Output
v_cc
Micro
Reset
Input
Gnd
Gnd
ISSUE 3 - FEBRUARY 2001
1