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参数资料
| 型号： | LTC1235CSW#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISRY CIRCUIT 16SOIC |
| 标准包装： | 1,000 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极，开路漏极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
LTC1235
Microprocessor
Supervisory Circuit
FEATURES
DESCRIPTION
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Guaranteed Reset Assertion at V CC = 1V
1.5mA Maximum Supply Current
Fast (35ns Max.) Onboard Gating of RAM Chip
Enable Signals
Conditional Battery Backup Extends Battery Life
4.65V Precision Voltage Monitor
Power OK/Reset Time Delay: 200ms
External Reset Control
Minimum External Component Count
1μA Maximum Standby Current
Voltage Monitor for Power Fail or Low Battery
Warning
Thermal Limiting
Performance Specified Over Temperature
All the LTC695 Features Plus Conditional Battery
Backup and External Reset Control
The LTC ? 1235 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
V CC as low as 1V. External reset control is provided by a
debounced pushbutton 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
APPLICATIONS
a P signal to either back up the RAMs or not. This extends
the battery life in situations where RAM data need not
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Critical μP Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems
always be saved when power goes down.
For an early warning of impending power failure, the
LTC1235 provides an internal comparator with a user-
de?ned threshold. An internal watchdog timer is also
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
available, which forces the reset pins to active states when
the watchdog input is not toggled prior to the time-out
period.
Battery Life vs
Backup Duty Cycle
V IN ≥ 7.5V
+
10μF
LT1086-5
V IN V OUT
ADJ
+5V
+
100μF
0.1μF
V CC
V OUT
LTC1235
0.1μF
POWER TO μP
CMOS RAM POWER
10
9
8
7
LTC1235
51k
10k
+3V
V BATT
PFI
PB RST
BACKUP
RESET
PFO
WDI
I/O LINE
μP RESET
μP NMI
I/O LINE
μP
SYSTEM
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4
3
2
LTC695
(WITHOUT
CONDITIONAL
BATTERY
BACKUP)
1235 TA1
1
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.
0
0
20 40 60 80
BACKUP DUTY CYCLE (%)
100
1235 TA02
1235fa
1
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