LTC1726_1 datasheet(1/12 Pages) LINER

No de pièce	LTC1726

Description	Triple Supply Monitor and 짰 Supervisor with Adjustable Reset and Watchdog Timer

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Fabricant	LINER [Linear Technology]

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1

LTC1726

1726fb

TYPICAL APPLICATIONS

FEATURES

DESCRIPTIO

Triple Supply Monitor and

µP Supervisor with Adjustable

Reset and Watchdog Timer

■

Monitors Three Inputs Simultaneously

LTC1726-5: 5V, 3.3V and ADJ

LTC1726-2.5: 2.5V, 3.3V and ADJ

■

±1.5% Threshold Accuracy Over Temperature

■ Low Supply Current: 16

µA Typ

■ Adjustable Reset Timeout

■

Adjustable Watchdog Timeout

■ Active Low Open-Drain Reset Output

■ Power Supply Glitch Immunity

■

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

■ 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.

■ Desktop Computers

■ Notebook Computers

■

Intelligent Instruments

■ Portable Battery-Powered Equipment

■ 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

APPLICATIO S

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

All other trademarks are the property of their respective owners.

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