LTC1726 datasheet(1/12 Pages) LINER

Numer części	LTC1726

Szczegółowy opis	Triple Supply Monitor and uP Supervisor with Adjustable Reset and Watchdog Timer

PDF	12 Pages

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Producent	LINER [Linear Technology]

Strona internetowa	http://www.linear.com

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1

LTC1726

Final Electrical Specifications

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

Triple Supply Monitor and

µP Supervisor with Adjustable

Reset and Watchdog Timer

January 2000

s

Monitors Three Inputs Simultaneously

LTC1726-5: 5V, 3.3V and ADJ

LTC1726-2.5: 2.5V, 3.3V and ADJ

s

±1.5% Threshold Accuracy Over Temperature

s

Low Supply Current: 16

µA Typ

s

Adjustable Reset Timeout

s

Adjustable Watchdog Timeout

s

Active Low Open-Drain Reset Output

s

Power Supply Glitch Immunity

s

Guaranteed RESET for VCC3 ≥ 1V or VCC25/VCC5 ≥ 1V

s

MS8 and SO-8 Packages

The LTC

®1726 is a triple supply monitor and microproces-

sor supervisory circuit with adjustable reset and watchdog

functions intended for systems with multiple supply volt-

ages. The part has a common open-drain reset output with

an adjustable delay. The reset and watchdog time-out

periods are both adjustable using external capacitors.

Tight 1.5% accuracy specifications and glitch immunity

ensure reliable reset operation without false triggering.

The RST output is guaranteed to be in the correct state for

VCC5/VCC25 or VCC3 down to 1V. The LTC1726 may also be

configured to monitor any one or two VCC inputs instead

of three, depending on system requirements.

The low (16

µA typical) supply current makes the LTC1726

ideal for power-conscious systems.

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

s

Desktop Computers

s

Notebook Computers

s

Intelligent Instruments

s

Portable Battery-Powered Equipment

s

Network Servers

VCC5

RT

CRT

47nF

CWT

47nF

21

4

3

6

R1

66.5k

1%

tRT = 155ms

tWT= 1s

R2

100k

1%

5

8

0.1

µF

7

1726 TA01

LTC1726-5

WT

RST

WDI

VCC3

5V

3.3V

1.8V

(VTRIP = 1.665V)

GND

VCCA

µP

RESET

I/O

0.1

µF

VCC25

RT

CRT

47nF

CWT

47nF

21

4

3

6

tRT = 155ms

tWT= 1s

R2

100k

1%

5

8

0.1

µF

7

1726 TA02

LTC1726-2.5

WT

RST

WDI

VCC3

2.5V

3.3V

1.8V

(VTRIP = 1.665V)

GND

VCCA

µP

RESET

I/O

0.1

µF

R1

66.5k

1%

A 3.3V, 5V and 1.8V Monitor

A 3.3V, 2.5V and 1.8V Monitor

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO S

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