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LTC691ISWPBF

Description
Microprocessor Supervisory Circuits
File Size216KB,18 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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Microprocessor Supervisory Circuits

LTC690/LTC691
LTC694/LTC695
Microprocessor
Supervisory Circuits
FEATURES
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DESCRIPTION
The LTC
®
690 family provides complete power supply
monitoring and battery control functions for microprocessor
reset, battery back-up, 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 external
memory. In addition, the
RESET
output is guaranteed to
remain logic low even with V
CC
as low as 1V.
The LTC690 family powers 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 LTC690
family provides 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 timeout period.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Guaranteed
Reset Assertion at V
CC
= 1V
1.5mA Maximum Supply Current
Fast (35ns Max) Onboard Gating of RAM Chip
Enable Signals
SO-8 and S16 Packaging
4.65V Precision Voltage Monitor
Power OK/Reset Time Delay: 50ms, 200ms
or Adjustable
Minimum External Component Count
1µA Maximum Standby Current
Voltage Monitor for Power-Fail
or Low-Battery Warning
Thermal Limiting
Performance Specified Over Temperature
Superior Upgrade for MAX690 Family
APPLICATIONS
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Critical μP Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems
TYPICAL APPLICATION
RESET
Output Voltage
vs Supply Voltage
5
V
IN
≥ 7.5V
LT 1086-5
V
IN
10μF
ADJ
V
OUT
®
5V
+
+
100μF
V
OUT
0.1μF
LTC690/LTC691
LTC694/LTC695
V
BATT
RESET
PFO
PFI
GND
WDI
μP
SYSTEM
μP
RESET
μP NMI
I/O LINE
690 TA01
RESET
OUTPUT VOLTAGE (V)
V
CC
POWER TO
μP
CMOS RAM POWER
0.1μF
4
3
T
A
= 25°C
EXTERNAL PULL-UP = 10μA
V
BATT
= 0V
3V
51k
2
1
10k
MICROPROCESSOR RESET, BATTERY BACK-UP, POWER FAILURE
WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP
FOR MICROPROCESSOR SYSTEMS
0.1μF
100Ω
0
0
1
3
4
2
SUPPLY VOLTAGE (V)
5
690 TA02
690fe
1
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