LTC1726IS8-2.5(RevB) Просмотр технического описания (PDF) - Linear Technology

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LTC1726IS8-2.5
(Rev.:RevB)

Triple Supply Monitor and µP Supervisor with Adjustable Reset and Watchdog Timer

Linear Technology 

LTC1726

Triple Supply Monitor and

µP Supervisor with Adjustable

Reset and Watchdog Timer

FEATURES

■ 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: 16µA 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

U

APPLICATIO S

■ Desktop Computers

■ Notebook Computers

■ Intelligent Instruments

■ Portable Battery-Powered Equipment

■ Network Servers

DESCRIPTIO

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 (16µA typical) supply current makes the LTC1726

ideal for power-conscious systems.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIONS

A 3.3V, 5V and 1.8V Monitor

3.3V

0.1µF

5V

0.1µF

1.8V

(VTRIP = 1.665V)

R1

66.5k

1%

CRT

47nF

213

VCC5 VCC3 VCCA

8

RT

6

RST

CWT

47nF

LTC1726-5

7

WT

5

WDI

R2

100k

1%

RESET

µP

I/O

GND

tRT = 155ms

4

tWT= 1s

1726 TA01

A 3.3V, 2.5V and 1.8V Monitor

3.3V

0.1µF

2.5V

0.1µF

1.8V

(VTRIP = 1.665V)

R1

66.5k

1%

CRT

47nF

21 3

VCC25 VCC3 VCCA

8

RT

6

RST

CWT

47nF

LTC1726-2.5

7

WT

5

WDI

R2

100k

1%

RESET

µP

I/O

GND

tRT = 155ms

4

tWT= 1s

1726 TA02

1726fb

1

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