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LTC690M

Description
1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16
Categorysemiconductor    Analog mixed-signal IC   
File Size147KB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Parametric View All

LTC690M Overview

1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16

LTC690M Parametric

Parameter NameAttribute value
Number of functions1
Number of terminals16
Maximum operating temperature85 Cel
Minimum operating temperature-40 Cel
Maximum supply/operating voltage5.5 V
Minimum supply/operating voltage4.75 V
Rated supply voltage5 V
Processing package description0.300 INCH, PLASTIC, DIP-16
stateACTIVE
CraftsmanshipCMOS
packaging shapeRECTANGULAR
Package SizeIN-LINE
Terminal formTHROUGH-HOLE
Terminal spacing2.54 mm
terminal coatingTIN LEAD
Terminal locationDUAL
Packaging MaterialsPLASTIC/EPOXY
Temperature levelINDUSTRIAL
Number of channels1
Analog IC other typesPOWER SUPPLY MANAGEMENT CKT
LTC690/LTC691
LTC694/LTC695
Microprocessor
Supervisory Circuits
FEATURES
s
s
s
s
DESCRIPTIO
®
s
s
s
s
s
s
s
s
s
UL Recognized
File # E145770
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
The LTC
®
690 family provides complete power supply
monitoring and battery control functions for microproces-
sor 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 time-out
period.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
Critical
µP
Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems
TYPICAL APPLICATIO
LT
®
1086-5
V
IN
ADJ
V
OUT
V
IN
7.5V
5V
10µF
100µF
0.1µF
LTC690/LTC691
LTC694/LTC695
V
BATT
RESET
PFO
PFI
GND WDI
0.1µF
0.1µF
µP
SYSTEM
µP
RESET
µP
NMI
I/O LINE
690 TA01
RESET OUTPUT VOLTAGE (V)
+
+
V
CC
V
OUT
POWER TO
µP
CMOS RAM POWER
3V
51k
10k
MICROPROCESSOR RESET, BATTERY BACK-UP, POWER FAILURE
WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP
FOR MICROPROCESSOR SYSTEMS
100Ω
U
RESET Output Voltage vs
Supply Voltage
5
T
A
= 25°C
EXTERNAL PULL-UP = 10µA
V
BATT
= 0V
4
3
2
1
0
0
1
3
4
2
SUPPLY VOLTAGE (V)
5
690 TA02
U
U
1
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