LTC695-3.3 LINER [Linear Technology], LTC695-3.3 Datasheet

LTC695-3.3

Manufacturer Part Number

LTC695-3.3

Description

3.3V Microprocessor Supervisory Circuits

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC695-3.3.pdf (16 pages)

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APPLICATIO S

FEATURES

TYPICAL APPLICATIO

UL Recognized

Guaranteed Reset Assertion at V

Pin Compatible with LTC694/LTC695

for 3.3V Systems

200 A Typical Supply Current

Fast (30ns Typ) On-Board Gating of

RAM Chip Enable Signals

SO-8 and S16 Packages

2.90V Precision Voltage Monitor

Power OK/Reset Time Delay: 200ms or Adjustable

Minimum External Component Count

1 A Maximum Standby Current

Voltage Monitor for Power-Fail or

Low-Battery Warning

Thermal Limiting

Performance Specified Over Temperature

3.3V Low Power Systems

Critical P Power Monitoring

Intelligent Instruments

Battery-Powered Computers and Controllers

Automotive Systems

18k

51k

1 F

MICROPROCESSOR RESET, BATTERY BACK-UP,

RAM WRITE PROTECTION, POWER WARNING AND

WATCHDOG TIMING ARE ALL IN A SINGLE CHIP

FOR 3.3V MICROPROCESSOR SYSTEM

SHDN

LT1129-3.3

OUT SENSE

GND

OUT

File # E145770

100 F

3.3V

= 1V

2.4V

0.1 F

PFI

BATT

LTC695-3.3

GND

CE OUT

RESET

CE IN

WDI

PFO

OUT

100

0.1 F

DESCRIPTIO

The LTC

power supply monitoring and battery control functions.

These include power-on reset, battery back-up, RAM write

protection, power failure warning and watchdog timing.

The devices are pin compatible upgrades of the LTC694/

LTC695 that are optimized for 3.3V systems. Operating

power consumption has been reduced to 0.6mW (typical)

and 3 W maximum in battery back-up mode. Micropro-

cessor reset and memory write protection are provided

when the supply falls below 2.9V. The RESET output is

guaranteed to remain logic low with V

The LTC694-3.3/LTC695-3.3 power the active 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

LTC694-3.3/LTC695-3.3 provide 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.

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

DECODER OUTPUT

RAM CS

I/O LINE

POWER TO

CMOS RAM

0.1 F

P RESET

P NMI

SYSTEM

694-3.3/LTC695-3.3 provide complete 3.3V

694/5-3.3 TA01

POWER

3.3V Microprocessor

LTC694-3.3/LTC695-3.3

Supervisory Circuits

RESET Output Voltage vs

Supply Voltage

SUPPLY VOLTAGE (V)

as low as 1V.

694/5-3.3 TA02

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