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LTC692 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC692
Description  Microprocessor Supervisory Circuits
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC692 Datasheet(HTML) 1 Page - Linear Technology

 
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LTC692/LTC693
®
s
UL Recognized
s
Guaranteed Reset Assertion at VCC = 1V
s
1.5mA Maximum Supply Current
s
Fast (35ns Max.) On-Board Gating of RAM Chip
Enable Signals
s
SO8 and SO16 Packaging
s
4.40V Precision Voltage Monitor
s
Power OK/Reset Time Delay:
200ms or Adjustable
s
Minimum External Component Count
s
1
µA Maximum Standby Current
s
Voltage Monitor for Power Fail or
Low Battery Warning
s
Thermal Limiting
s
Performance Specified Over Temperature
s
Superior Upgrade for MAX690 Family
The LTC692/LTC693 provide complete power supply moni-
toring and battery control functions for microprocessor
reset, battery backup, CMOS RAM write protection, power
failure warning and watchdog timing. 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 and the
Chip Enable output unconditionally write-protects exter-
nal memory. In addition, the RESET output is guaranteed
to remain logic low even with VCC as low as 1V.
The LTC692/LTC693 power the active CMOS RAMs with a
charge pumped NMOS power switch to achieve low drop-
out and low supply current. When primary power is lost,
auxiliary power, connected to the battery input pin, powers
the RAMs in standby through an efficient PMOS switch.
For an early warning of impending power failure, the
LTC692/LTC963 provide an internal comparator with a
user-defined threshold. An internal watchdog timer is
also available, which forces the reset pins to active states
when the watchdog input is not toggled prior to a preset
time-out period.
DESCRIPTIO
S
FEATURE
APPLICATI
TYPICAL
RESET Output Voltage vs
Supply Voltage
+
+
ADJ
VIN
VOUT
10
µF
VIN ≥ 7.5V
5V
100
µF
0.1
µF
µP NMI
µP
POWER
POWER TO
CMOS RAM
I/O LINE
µP RESET
µP
SYSTEM
0.1µF
3V
51k
10k
LTC692/3 • TA01
LT1086-5
MICROPROCESSOR RESET, BATTERY BACKUP, POWER FAILURE
WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP
FOR MICROPROCESSOR SYSTEMS.
LTC692
LTC693
VBATT
PFI
WDI
RESET
PFO
VOUT
VCC
GND
0.1
µF
100
Microprocessor
Supervisory Circuits
SUPPLY VOLTAGE (V)
0
3
4
5
4
2
1
0
1
2
3
5
TA = 25°C
EXTERNAL PULL-UP = 10µA
VBATT = 0V
LTC692/3 • TA02
®
S
APPLICATI
s
Critical
µP Power Monitoring
s
Intelligent Instruments
s
Battery-Powered Computers and Controllers
s
Automotive Systems


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