LTC699I LINER [Linear Technology], LTC699I Datasheet

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LTC699I

Manufacturer Part Number
LTC699I
Description
Microprocessor Supervisory Circuit
Manufacturer
LINER [Linear Technology]
Datasheet

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+5V
FEATURE
A
TYPICAL
PPLICATI
Guaranteed Reset Assertion at V
1.5mA Maximum Supply Current
SO-8 Packaging
4.65V Precision Voltage Monitor
Power OK/Reset Time Delay: 200ms
Minimum External Component Count
Performance Specified Over Temperature
Superior Upgrade for MAX699
Critical P Power Monitoring
Intelligent Instruments
Computers and Controllers
Automotive Systems
0.1µF
V
MICROPROCESSOR RESET AND WATCHDOG TIMING IN
A SINGLE CHIP FOR MICROPROCESSOR SYSTEMS.
A
S
CC
O
PPLICATI
LTC699
GND
U
RESET
WDI
S
500k
O
U
CC
= 1V
0.1µF
µP RESET
I/O LINE
µP POWER
SYSTEM
µP
LTC699 TA1
V CC
D
The LTC699 provides power supply monitoring for
microprocessor-based systems. The features include mi-
croprocessor reset and watchdog timing. Precise internal
voltage reference and comparator circuit monitor the
power supply line. When an out-of-tolerance condition
occurs, the RESET output is forced to active low. In
addition, the RESET output is guaranteed to remain logic
low even with V
An internal watchdog timer is also available, which forces
the RESET output to active low when the watchdog input
is not toggled prior to the time-out period of 1.6 seconds.
The LTC699 is offered in DIP and surface mount packages.
BLOCK
ESCRIPTIO
WDI
1.3V
I D AGRA
CC
Supervisory Circuit
OSC
+
as low as 1V.
C1
TRANSITION
U
DETECTOR
Microprocessor
W
RESET PULSE
GENERATOR
WATCHDOG
TIMER
LTC699
LTC699 BD
RESET
1
GND

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LTC699I Summary of contents

Page 1

FEATURE S Guaranteed Reset Assertion at V 1.5mA Maximum Supply Current SO-8 Packaging 4.65V Precision Voltage Monitor Power OK/Reset Time Delay: 200ms Minimum External Component Count Performance Specified Over Temperature Superior Upgrade for MAX699 O U PPLICATI S A Critical ...

Page 2

... CC WDI Input .............................. – 0. RESET Output ...................................... – 0. Power Dissipation............................................. 500mW Operating Temperature Range LTC699C .............................................. LTC699I ........................................... – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec.)................ 300 C ELECTRICAL C HARA TERISTICS C PARAMETER Operating Voltage Range ...

Page 3

CTIO +5V supply input. The V pin should be bypassed CC CC with a 0.1 F capacitor. GND: Ground pin. RESET: Open drain output for P reset control. When V falls below ...

Page 4

LTC699 PPLICATI S I FOR ATIO RESET t1 Watchdog Timer The LTC699 provides a watchdog timer function to moni- tor the activity of the microprocessor. If the microproces- sor does not toggle the ...

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