LTC1232(RevA) 查看數據表（PDF） - Linear Technology
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LTC1232 Datasheet PDF : 8 Pages
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FEATURES
■ Guaranteed Reset Assertion at VCC = 1V
■ 8-Pin SO Plastic Package
■ 2.0mA Maximum Supply Current
■ 4.62V/4.37V Precision Voltage Monitor
■ Power OK/Reset Time Delay: 600ms
■ Minimum External Component Count
■ Superior Upgrade for DS1232
U
APPLICATIO S
■ Critical µP Power Monitoring
■ Intelligent Instruments
■ Computers and Controllers
■ Automotive Systems
LTC1232
Microprocessor
Supervisory Circuits
DESCRIPTIO
The LTC®1232 provides power supply monitoring,
watchdog timing and external reset for microprocessor
systems. A precise internal voltage reference and
comparator circuit monitor the power supply line. When
an out-of-tolerance condition occurs, the reset outputs
are forced to active states. The RST output is guaranteed
to remain logic low even with VCC as low as 1V.
The LTC1232 has an internal watchdog timer which forces
the reset outputs to active states when the Strobe input is
not forced low prior to a preset time-out period. The
watchdog timing can be set to operate on time-out periods
of typically 150ms, 600ms or 1.2 seconds.
The LTC1232 performs push-button reset control.
The LTC1232 debounces the push-button input
and guarantees an active reset pulse width of 250ms
minimum.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V DC
PB RST VCC
TD
ST
LTC1232
TOL
RST
GND
RST
5V DC
MPU
(e.g. 6805)
100k
I/O LINE
RESET
LTC1232 • TA01
RST Output Voltage vs
Supply Voltage
5
4
3
2
1
0
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
LTC1232 • TA02
sn1232 1232fas
1
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