LT1232 Linear Technology Corporation, LT1232 Datasheet

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LT1232

Manufacturer Part Number
LT1232
Description
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Guaranteed Reset Assertion at V
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
Critical µP Power Monitoring
Intelligent Instruments
Computers and Controllers
Automotive Systems
5V DC
PB RST
TD
TOL
GND
U
LTC1232
RST
RST
V
ST
CC
U
5V DC
CC
100k
= 1V
I/O LINE
RESET
(e.g. 6805)
MPU
LTC1232 • TA01
DESCRIPTIO
The LTC
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 V
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.
®
1232 provides power supply monitoring,
5
4
1
3
2
0
0
RST Output Voltage vs
1
U
Supervisory Circuits
Supply Voltage
SUPPLY VOLTAGE (V)
2
Microprocessor
3
CC
as low as 1V.
4
LTC1232 • TA02
LTC1232
5
sn1232 1232fas
1

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LT1232 Summary of contents

Page 1

... 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 MPU (e.g. 6805) 100k I/O LINE RESET LTC1232 • ...

Page 2

LTC1232 ABSOLUTE AXI U RATI GS (Note 1, 2 and 3) Terminal Voltage V ....................................................... –0. and RST .......................................... –0.3V to 7.0V All Other Inputs and Outputs ...... –0. Power Dissipation ...

Page 3

RECO E DED OPERATI G CO DITIO S over the full operating temperature SYMBOL PARAMETER V Supply Voltage and PB RST Input High Level and PB RST Input Low ...

Page 4

LTC1232 DIAGRA S Push-Button Reset PB RST RST RST Strobe Input BLOCK DIAGRA TOL 3 5%, 10% SWITCH ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS V Trip Point vs Temperature CC 4.63 TOL = GND 4.62 4.61 4.60 4.59 4.58 4.57 –50 – 100 TEMPERATURE (˚C) LTC1232 • TPC01 Time-Out Period vs Temperature 696 ...

Page 6

LTC1232 CTIO S RST: Open Drain Logic Output for µP Reset Control. The LTC1232 provides three ways to generate µP reset. First, when V falls below V trip point (4.75V with CC CC TOL = ...

Page 7

... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 8

... Thresholds (±0.75%) Meets PCI t Timing Specifications FAIL Adjustable RESET and Watchdog Time-Outs Adjustable RESET and Watchdog Time-Outs Individual Monitor Outputs in MSOP 5-Lead SOT-23 Package 5-Lead SOT-23 Package 5-Lead SOT-23 Package LW/TP 1002 1K REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 1992 sn1232 1232fas ...

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