LTC1726IS8-2.5(RevB) 데이터 시트보기 (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

PI FU CTIO S

RT (Pin 8): Reset Time-Out Input. Place a capacitor

between this pin and ground to adjust the reset time-out

period. To determine the reset time-out period:

tRT = 3.30 • CRT

with tRT in µs and CRT in pF. As an example, a 47nF

capacitor will generate a 155ms reset time-out period.

BLOCK DIAGRA

WDI 5

VCC3 1

VCC5/VCC25 2

VCCA 3

GND 4

TRANSITION DETECT

–

+

–

+

–

1V +

BANDGAP

REFERENCE

WATCHDOG

TIMER

VCC3

2µA

WT

7

+

CWT

22µA

POWER

DETECT

VCC

INTERNAL

VCC5/VCC25

VCC3

6µA

ADJUSTABLE

RESET

PULSE

GENERATOR

6 RST

2µA

22µA

8

+ RT

CRT

1726 BD

TI I G DIAGRA S

VCC Monitor Timing

VCCX

VRTX

tUV

RST

6

tRT

1.5V

1726 TD01

Watchdog Timing Diagram

WDI

RST

tWP

tWT

tRT

tWT

tRT

1.5V

1726 TD02

1726fb

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