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LTC1232

Linear Technology
Part Number LTC1232
Manufacturer Linear Technology
Description Microprocessor Supervisory Circuit
Published Mar 22, 2005
Detailed Description U U FEATURES ■ Guaranteed Reset Assertion at VCC = 1V ■ 8-Pin SO Plastic Package ■ 2.0mA Maximum Supply Current ■ 4.62V...
Datasheet PDF File LTC1232 PDF File

LTC1232
LTC1232


Overview
U U 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 100k MPU (e.
g.
6805) I/O LINE RESET LTC1232 • TA01 RST OUTPUT VOLTAGE (V) RST Output Voltage vs Supply Voltage 5 4 3 2 1 0 01 2 345 SUPPLY VOLTAGE (V) LTC1232 • TA02 sn1232 1232fas 1 U U WW W LTC1232 ABSOLUTE AXI U RATI GS (Note 1, 2 and 3) Terminal Voltage VCC –0.
3V to 7.
0V ST and RST .
.
–0.
3V to 7.
0V All Other Inputs and Outputs .
–0.
3V to VCC +0.
3V Power Dissipation .
500mW Operating Temperature Range LTC1232C .
.
0°C to 70...


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