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参数资料
| 型号： | LTC693CSW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISRY CIRCUIT 16SOIC |
| 标准包装： | 47 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.4V |
| 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： | 管件 |
LTC692/LTC693
Microprocessor
Supervisory Circuits
FEATURES
DESCRIPTION
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Guaranteed Reset Assertion at V CC = 1V
1.5mA Maximum Supply Current
Fast (35ns Maximum) Onboard Gating of RAM Chip
Enable Signals
4.40V Precision Voltage Monitor
Power OK/Reset Time Delay: 200ms or Adjustable
Minimum External Component Count
1μA Maximum Standby Current
Voltage Monitor for Power-Fail or Low Battery
Warning
Thermal Limiting
Performance Speci?ed Over Temperature
Superior Upgrade for MAX690 Family
SO8 and SO16 Packaging
The LTC ? 692/LTC693 provide complete power supply
monitoring and battery control functions for microproces-
sor 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 external
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
APPLICATIONS
n Critical μP Power Monitoring
n Intelligent Instruments
n Battery-Powered Computers and Controllers
n Automotive Systems
TYPICAL APPLICATION
the RAMs in standby through an ef?cient PMOS switch.
For an early warning of impending power failure, the
LTC692/LTC693 provide an internal comparator with a
user-de?ned 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
timeout period.
L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners..
RESET Output Voltage vs
Supply Voltage
5
T A = 25°C
V IN ≥ 7.5V
+
10μF
LT1086-5
V IN V OUT
ADJ
5V
+
100μF
0.1μF
V CC
LTC692
LTC693
V OUT
0.1μF
POWER TO μP
CMOS RAM POWER
μP
4
3
EXTERNAL PULL-UP = 10μA
V BATT = 0V
V BATT
SYSTEM
51k
3V
RESET
PFO
μP RESET
μP NMI
2
10k
PFI
GND
WDI
0.1μF
I/O LINE
100Ω
692_3 ? TA01
1
MICROPROCESSOR RESET, BATTERY BACKUP, POWER FAILURE
WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP
FOR MICROPROCESSOR SYSTEMS
0
0
1
2 3
SUPPLY VOLTAGE (V)
4
5
692_3 ? TA02
0692fb
1
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| LTC693I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
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