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LTC1235 데이터시트(Datasheet) 1 Page - Linear Technology

부품명 LTC1235
상세내용  Microprocessor Supervisory Circuit
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제조사  LINER [Linear Technology]
홈페이지  http://www.linear.com
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LTC1235
The LTC1235 provides complete power supply monitoring
and battery control functions for microprocessor reset,
battery backup, RAM write protection, power failure warn-
ing and watchdog timing. The LTC1235 has all the LTC695
features plus conditional battery backup and external reset
control. When an out-of-tolerance power supply condition
occurs, the reset outputs are forced to active states and the
Chip Enable output write-protects external memory. The
RESET output is guaranteed to remain logic low with VCC as
low as 1V. External reset control is provided by a debounced
push-button reset input.
The LTC1235 powers the active CMOS RAMs with a charge
pumped NMOS power switch to achieve low dropout and
low supply current. When primary power is lost, auxiliary
power, connected to the battery input pin, provides backup
power to the RAMs. The LTC1235 can be programmed by
a
µP signal to either back up the RAMs or not. This extends
the battery life in situations where RAM data need not
always be saved when power goes down.
For an early warning of impending power failure, the
LTC1235 provides an internal comparator with a user-
defined threshold. An internal watchdog timer is also avail-
able, which forces the reset pins to active states when the
watchdog input is not toggled prior to the time-out period.
Microprocessor
Supervisory Circuit
S
APPLICATI
DESCRIPTIO
S
FEATURE
s
Guaranteed Reset Assertion at VCC = 1V
s
1.5mA Maximum Supply Current
s
Fast (35ns Max.) Onboard Gating of RAM Chip
Enable Signals
s
Conditional Battery Backup Extends Battery Life
s
4.65V Precision Voltage Monitor
s
Power OK/Reset Time Delay: 200ms
s
External Reset Control
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
All the LTC695 Features Plus Conditional Battery
Backup and External Reset Control
s
Critical
µP Power Monitoring
s
Intelligent Instruments
s
Battery-Powered Computers and Controllers
s
Automotive Systems
APPLICATI
TYPICAL
BACKUP DUTY CYCLE (%)
0
6
8
10
80
LTC1235 TA02
4
2
0
20
40
60
100
1
3
5
7
9
LTC1235
LTC695
(WITHOUT
CONDITIONAL
BATTERY
BACKUP)
Battery Life vs
Backup Duty Cycle
+
+
ADJ
VIN
VOUT
10µF
VIN ≥ 7.5V
+5V
100µF
0.1µF
LTC1235
VOUT
VCC
VBATT
PFI
WDI
µP NMI
µP
POWER
POWER TO
CMOS RAM
I/O LINE
µP RESET
µP
SYSTEM
0.1µF
+3V
51k
10k
LTC1235 TA1
RESET
PFO
LT1086-5
THE LTC1235 EXTENDS BATTERY LIFE BY PROVIDING BATTERY POWER ONLY WHEN REQUIRED TO BACK UP RAM DATA.
IT SAVES THE BATTERY WHEN NO DATA BACKUP IS NEEDED. THE
µP REQUESTS BACKUP WITH THE BACKUP PIN.
I/O LINE
BACKUP
PB RST




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