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MIC1232 Datasheet(PDF) 1 Page - Micrel Semiconductor

Part No. MIC1232
Description  μP Supervisory Circuit
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC1232 Datasheet(HTML) 1 Page - Micrel Semiconductor

   
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1
The MIC1232 is a multifunction circuit which monitors
microprocessor activity, external reset and power
supplies in microprocessor based systems. The circuit
functions include a watchdog timer, power supply
monitor, microprocessor reset, and manual pushbutton
reset input.
The power supply line is monitored with a comparator
and an internal voltage reference. RST is forced low
when an out-of-tolerance condition exists and remains
asserted for at least 250ms after VCC rises above the
threshold voltage (4.5V or 4.75V). The RST pin will
remain logic low with VCC as low as 1.4V.
The Watchdog input (ST) monitors
µP activity and will
assert RST if no
µP activity has occurred within the
watchdog timeout period. The watchdog timeout period
is selectable with nominal periods of 150, 600, or 1200
milliseconds.
1
2
3
4
TD
TOL
GND
8
7
6
5
VCC
RST
RST
MIC1232
PBRST
ST
MIC1232N - 8 Lead Plastic DIP Package
MIC1232M - 8 Lead Plastic SOIC Package
Part
Package
Temp. Range
MIC1232N
8-Lead PDIP
-40°C to +85°C
MIC1232M
8-Lead SOIC
-40°C to +85°C
· Automotive Systems
· Intelligent Instruments
· Critical Microprocessor Power Monitoring
· Battery Powered Computers
· Controllers
· Power OK/Reset Time Delay, 250ms min.
· Watchdog Timer, 150ms, 600ms, or
1.2s typical
· Precision Supply Voltage Monitor, Select
Between 5% or 10% of Supply Voltage
· Available in 8-pin Surface Mount (SO)
· Debounced External Reset Input
· Low Supply Current, < 18µA Typ.
VCC
RST
µP
RESET
VCC
MIC1232
VCC
PBRST
TOL GND
ST
I/O
TD
Typical Operating Circuit
Features
Description
Pin Configuration
Ordering Information
Typical Applications
Top View
MIC1232 µP Supervisory Circuit
MIC1232
µP Supervisory Circuit


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