PCF1252 데이터 시트보기 (PDF) - Philips Electronics

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PCF1252

Threshold detector and reset generator

Philips Electronics 

Philips Semiconductors

Threshold detector and reset generator

Product specification

PCF1252-X family

103

handbook, full pagewidth

tR(1)

(ms)

102

MGC922 102

tS(2)

(ms)

10

10

1

1

10−1

10−1

10−3

10−2

(1) tR (typ.) = (0.1 + CCT) ms.

(2) tS (typ.) = (0.01 + 0.1 CCT) ms.

10−1

10−2

1

10

102

103

external capacitor (nF)

Fig.8 Reset and save times as a function of the external capacitor (CCT).

APPLICATION INFORMATION

handbook, full pagewidth

VDD

(+5 V)

VSS

(0 V)

PCF1252-X VDD

COMIN

RESET

SELECT

VSS

CT

1 nF

VDD

RESET

MICROCONTROLLER/

MICROPROCESSOR

VSS

MGC923

Fig.9 Typical power-on reset circuit for a microcontroller/microprocessor system; (when not used, COMIN must

be connected to VDD).

1998 Apr 16

8

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