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LTC699 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC699
Description  Microprocessor Supervisory Circuit
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC699 Datasheet(HTML) 1 Page - Linear Technology

   
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1
LTC699
s
Guaranteed Reset Assertion at VCC = 1V
s
1.5mA Maximum Supply Current
s
SO-8 Packaging
s
4.65V Precision Voltage Monitor
s
Power OK/Reset Time Delay: 200ms
s
Minimum External Component Count
s
Performance Specified Over Temperature
s
Superior Upgrade for MAX699
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 VCC as low as 1V.
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.
DESCRIPTIO
S
FEATURE
Microprocessor
Supervisory Circuit
S
APPLICATI
s
Critical
µP Power Monitoring
s
Intelligent Instruments
s
Computers and Controllers
s
Automotive Systems
APPLICATI
TYPICAL
I
DAGRA
BLOCK
0.1µF
µP POWER
I/O LINE
µP RESET
µP
SYSTEM
0.1µF
500k
LTC699 TA1
VCC
GND
WDI
RESET
MICROPROCESSOR RESET AND WATCHDOG TIMING IN
A SINGLE CHIP FOR MICROPROCESSOR SYSTEMS.
+5V
LTC699
VCC
RESET PULSE
GENERATOR
WDI
1.3V
+
C1
OSC
RESET
LTC699 BD
GND
TRANSITION
DETECTOR
WATCHDOG
TIMER


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