ZXCM210 ZETEX [Zetex Semiconductors], ZXCM210 Datasheet

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ZXCM210

Manufacturer Part Number
ZXCM210
Description
VERY LOW POWER MICROPROCESSOR RESET DEVICES
Manufacturer
ZETEX [Zetex Semiconductors]
Datasheet

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ISSUE 3 - FEBRUARY 2001
VERY LOW POWER MICROPROCESSOR RESET DEVICES
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
1
APPLICATION CIRCUIT
APPLICATIONS
v
cc
Computer systems
Controllers
Instrumentation
Microprocessor power monitoring
Microcontroller power monitoring
Power supplies
Portable/Battery-powered equipment
Automotive
ZXCM
Gnd
v
cc
Output
Reset
ZXCM209
ZXCM210
Reset
Input
Micro
Gnd
v
cc

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ZXCM210 Summary of contents

Page 1

... The ZXCM209 has an active-low RESET output (which is guaranteed 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 2µ ...

Page 2

... ZXCM209 ZXCM210 ABSOLUTE MAXIMUM RATINGS Terminal Voltage with respect RESET, RESET Input Current Output Current Rate of Rise Continuous Power Dissipation Operating Temperature Range Storage Temperature Range Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. ...

Page 3

... ELECTRICAL CHARACTERISTICS ZXCM209 TEST CONDITIONS (unless otherwise stated) V SYMBOL PARAMETER V Reset Output Voltage OL Low V Reset Output Voltage OH High ELECTRICAL CHARACTERISTICS ZXCM210 TEST CONDITIONS (unless otherwise stated) V SYMBOL PARAMETER V Reset Output Voltage OL Low V Reset Output Voltage OH High Note: Device testing is performed at T TYPICAL CHARACTERISTICS ...

Page 4

... ZXCM209 ZXCM210 TYPICAL CHARACTERISTICS ISSUE 3 - FEBUARY 2001 4 ...

Page 5

... V resistor value is non critical: a value of 100k recommended. For the ZXCM209 the resistor should pin will provide be applied between reset output and ground: for the CC ZXCM210 between reset output and V shows the connection diagram for the ZXCM devices in these configurations ...

Page 6

... RESET Output remains low while Vcc is below the reset threshold, and for a minimum 140ms after V (ZXCM209) Output remains high while V RESET minimum 140ms after V (ZXCM210) 3 Gnd Ground operation of the reset circuit. A buffer to other circuit components is then required to enable the processor reset drive to operate correctly ...

Page 7

... M25 T M26 S M27 R ZXCM210 Threshold voltage codes PART MARK THRESHOLD CODE M28 L The only Reset High variant currently available is the ZXCM210LF. Contact your local Zetex Office for more details. ISSUE 3 - FEBRUARY 2001 PACKAGE RESET OUTPUT SOT23 LOW SOT23 HIGH RESET THRESHOLD (V) 4.63 4 ...

Page 8

... ZXCM209 ZXCM210 PACKAGE DIMENSIONS DIM Millimetres Min Max A 2.67 3.05 B 1.20 1.40 C – 1.10 D 0.37 0.53 F 0.085 0.15 G NOM 1.9 K 0.01 0.10 L 2.10 2.50 N NOM 0.95 Zetex plc. Fields New Road, Chadderton, Oldham, OL9-8NP, United Kingdom. Telephone: (44)161 622 4422 (Sales), (44)161 622 4444 (General Enquiries) Fax: (44)161 622 4420 Zetex GmbH Zetex Inc. Streitfeldstraß ...

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