Datasheet > LTC690I

LTC690I

更新时间： 2024-09-14 22:51:47

品牌	Logo	应用领域
凌特 - Linear		微处理器监控
页数	文件大小	规格书
16页	144K
描述
Microprocessor Supervisory Circuits

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中文翻译

获取价格

数据手册

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LTC690I 数据手册

LTC690/ LTC691

LTC694/ LTC695

Mic ro p ro c e sso r

Sup e rviso ry Circ uits

FEATURES

DESCRIPTIO

The LTC^®690 family provides complete power supply

monitoringandbatterycontrolfunctions formicroproces-

sor reset, battery back-up, CMOS RAM write protection,

power failure warning and watchdog timing. A precise

internal voltage reference and comparator circuit monitor

thepowersupplyline. Whenanout-of-tolerancecondition

occurs,theresetoutputs areforcedtoactivestates andthe

chipenableoutputunconditionallywrite-protects external

memory. In addition, the RESET output is guaranteed to

■

UL Recognized

Guaranteed Reset Assertion at V = 1V

1.5mA Maximum Supply Current

Fast (35ns Max) Onboard Gating of RAM Chip

Enable Signals

File # E145770

■

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

remain logic low even with V 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,

auxiliarypower,connectedtothebatteryinputpin,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-definedthreshold. Aninternalwatchdogtimeris also

available, which forces the reset pins to active states when

thewatchdoginputis nottoggledpriortoapresettime-out

period.

APPLICATIO S

■

Critical µP Power Monitoring

Intelligent Instruments

Battery-Powered Computers and Controllers

Automotive Systems

■

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

RESET Output Voltage vs

Supply Voltage

LT^®1086-5

= 25°C

≥ 7.5V

EXTERNAL PULL-UP = 10µA

= 0V

POWER TO

CMOS RAM POWER

µP

OUT

BATT

0.1µF

LTC690/LTC691

LTC694/LTC695

BATT

100µF

10µF

ADJ

µP

SYSTEM

µP RESET

µP NMI

RESET

PFO

51k

10k

I/O LINE

PFI

WDI

GND

690 TA01

0.1µF

100Ω

MICROPROCESSOR RESET, BATTERY BACK-UP, POWER FAILURE

WARNING AND WATCHDOG TIMING ARE ALL IN A SINGLE CHIP

FOR MICROPROCESSOR SYSTEMS

SUPPLY VOLTAGE (V)

690 TA02

12 3 4 5 6 7...16

中文翻译

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与LTC690I相关器件

型号	品牌	获取价格	描述	数据表
LTC690IJ8	Linear	获取价格	IC 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, CDIP8, 0.300 INCH, HERMETIC SEALED, CERDIP-8, Po
LTC690IN8	Linear	获取价格	Microprocessor Supervisory Circuits
LTC690IN8#PBF	Linear	获取价格	LTC690 - Microprocessor Supervisory Circuits; Package: PDIP; Pins: 8; Temperature Range: -
LTC690IN8PBF	Linear	获取价格	Microprocessor Supervisory Circuits
LTC690IN8-PBF	Linear	获取价格	Microprocessor Supervisory Circuits
LTC690IS8	Linear	获取价格	Microprocessor Supervisory Circuits
LTC690IS8#PBF	Linear	获取价格	LTC690 - Microprocessor Supervisory Circuits; Package: SO; Pins: 8; Temperature Range: -40
LTC690IS8#TR	Linear	获取价格	LTC690 - Microprocessor Supervisory Circuits; Package: SO; Pins: 8; Temperature Range: -40
LTC690IS8#TRPBF	Linear	获取价格	LTC690 - Microprocessor Supervisory Circuits; Package: SO; Pins: 8; Temperature Range: -40
LTC690IS8PBF	Linear	获取价格	Microprocessor Supervisory Circuits

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