ISSUE 3 - FEBRUARY 2001

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

VERY LOW POWER MICROPROCESSOR RESET DEVICES

APPLICATION CIRCUIT

v

cc

ZXCM

Reset

Output

Gnd

v

cc

v

cc

Micro

Reset

Input

Gnd

1