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LTC694, LTC6943, LTC694-3.3CS8

Table of contents:
Info of LTC694
Info of LTC6943
Info of LTC694-3.3CS8

LTC694, LTC6943, LTC694-3.3CS8 Selling Leads, Datasheet

MFG:1065 Package Cooled:DIP8 D/C:58

LTC694, LTC6943, LTC694-3.3CS8 Datasheet download

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Part Number: LTC694

MFG: 1065

Package Cooled: DIP8

D/C: 58

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LTC694 General Description

The LTC^®690 family provides complete power supply monitoring and battery control functions for microprocessor 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 dropout 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.

LTC694 Maximum Ratings

Terminal Voltage
    V_CC ................................................ 0.3V to 6.0V
    V_BATT ............................................. 0.3V to 6.0V
    All Other Inputs ............... 0.3V to (V_OUT + 0.3V)
Input Current
    V_CC ............................................................ 200mA
    V_BATT ........................................................... 50mA
    GND ............................................................. 20mA
VOUT Output Current ............ Short-Circuit Protected
Power Dissipation ......................................... 500mW
Operating Temperature Range
    LTC690/91/94/95C ............................ 0°C to 70°C
    LTC690/91/94/95I ......................... 40°C to 85°C
    LTC690M ...................................... 55°C to 125°C
Storage Temperature Range ........... 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)............ 300°C

LTC694 Features

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
1mA Maximum Standby Current
Voltage Monitor for Power-Fail or Low-Battery Warning
Thermal Limiting
Performance Specified Over Temperature
Superior Upgrade for MAX690 Family

LTC694 Typical Application

Critical P Power Monitoring
Intelligent Instruments
Battery-Powered Computers and Controllers
Automotive Systems

LTC694 Connection Diagram

LTC6943 General Description

The LTC®6943 is a monolithic, charge-balanced, dual switched capacitor instrumentation building block. A pair of switches alternately connects an external capacitor to an input voltage and then connects the charged capacitor across an output port. The internal switches have a break-before-make action. An internal clock is provided and its frequency can be adjusted with an external capacitor. The LTC6943 can also be driven with an external CMOS clock.

The LTC6943, when used with low clock frequencies, provides ultra precision DC functions without requiring precise external components. Such functions are differential voltage to single-ended conversion, voltage inversion, voltage multiplication and division by 2, 3, 4, 5, etc.

The LTC6943 is manufactured using Linear Technology's enhanced LTCMOSTM silicon gate process, and it is functionally compatible with the LTC1043.

LTC6943 Maximum Ratings

Supply Voltage ........................................................ 18V
Input Voltage at Any Pin ........0.3V V_IN V+ + 0.3V
Operating Temperature Range
(Note 2) ............................................ 40°C to 125°C
Specified Temperature Range
(Note 2) .............................................40°C to 125°C
Storage Temperature Range ............ 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C

LTC6943 Features

Low Power, IS = 60µA(Max)
Robust, Latch Up Proof
Instrumentation Front End with 120dB CMRR
Precise, Charge-Balanced Switching
Operates from 5V to 18V
Internal or External Clock
Operates up to 5MHz Clock Rate
Two Independent Sections with One Clock
Tiny SSOP-16 Package

LTC6943 Typical Application

Ultra Precision Voltage Inverters, Multipliers and Dividers
VF and FV Converters
Sample-and-Hold
Current Sources
Precision Instrumentation Amplifiers

LTC6943 Connection Diagram

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