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LTC693IS Datasheet

  • LTC693IS

  • Microprocessor Supervisory Circuits

  • 309.11KB

  • 16頁

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LTC692/LTC693
Microprocessor
Supervisory Circuits
FEATURES
s
s
s
s
DESCRIPTIO
廬
s
s
s
s
s
s
s
s
s
UL Recognized
廬
Guaranteed
Reset Assertion at V
CC
= 1V
1.5mA Maximum Supply Current
Fast (35ns Max.) On-Board Gating of RAM Chip
Enable Signals
SO8 and SO16 Packaging
4.40V Precision Voltage Monitor
Power OK/Reset Time Delay:
200ms or Adjustable
Minimum External Component Count
1碌A(chǔ) Maximum Standby Current
Voltage Monitor for Power Fail or
Low Battery Warning
Thermal Limiting
Performance Specified Over Temperature
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 V
CC
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.
APPLICATI
s
s
s
s
S
Critical
碌P
Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems
TYPICAL APPLICATI
V
IN
鈮?/div>
7.5V
LT1086-5
V
IN
ADJ
V
OUT
5V
10碌F
100碌F
0.1碌F
LTC692
LTC693
V
BATT
0.1碌F
碌P
SYSTEM
碌P
RESET
碌P
NMI
I/O LINE
LTC692/3 鈥?TA01
RESET OUTPUT VOLTAGE (V)
+
+
V
CC
V
OUT
POWER TO
碌P
CMOS RAM POWER
3V
51k
PFI
10k
MICROPROCESSOR RESET, BATTERY BACKUP, POWER FAILURE
WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP
FOR MICROPROCESSOR SYSTEMS.
GND
RESET
PFO
WDI
0.1碌F
100鈩?/div>
U
RESET Output Voltage vs
Supply Voltage
5
T
A
= 25擄C
EXTERNAL PULL-UP = 10碌A(chǔ)
V
BATT
= 0V
4
3
2
1
0
0
1
3
4
2
SUPPLY VOLTAGE (V)
5
LTC692/3 鈥?TA02
UO
UO
1

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