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LTC694IN8 Datasheet

  • LTC694IN8

  • Microprocessor Supervisory Circuits

  • 144.85KB

  • 16頁

  • LINER

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LTC690/LTC691
LTC694/LTC695
Microprocessor
Supervisory Circuits
FEATURES
s
s
s
s
DESCRIPTIO
廬
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
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 LTC
廬
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
碌P
Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems
TYPICAL APPLICATIO
LT
廬
1086-5
V
IN
ADJ
V
OUT
V
IN
鈮?/div>
7.5V
5V
10碌F
100碌F
0.1碌F
LTC690/LTC691
LTC694/LTC695
V
BATT
RESET
PFO
PFI
GND WDI
0.1碌F
0.1碌F
碌P
SYSTEM
碌P
RESET
碌P
NMI
I/O LINE
690 TA01
RESET OUTPUT VOLTAGE (V)
+
+
V
CC
V
OUT
POWER TO
碌P
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
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
690 TA02
U
U
1

LTC694IN8 產(chǎn)品屬性

  • LTC690-91/94-95

  • 50

  • 集成電路 (IC)

  • PMIC - 監(jiān)控器

  • -

  • 簡單復(fù)位/加電復(fù)位

  • 1

  • 開路漏極或開路集電極

  • 高有效/低有效

  • 最小為 140 ms

  • 4.65V

  • -40°C ~ 85°C

  • 通孔

  • 8-DIP（0.300"，7.62mm）

  • 8-PDIP

  • 管件

LTC694IN8相關(guān)型號PDF文件下載

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