PCF1252-X View Datasheet(PDF) - Philips Electronics

Part Name

Description

MFG CO.

PCF1252-X

Threshold detector and reset generator

Philips Electronics 

Philips Semiconductors

Threshold detector and reset generator

Product specification

PCF1252-X family

handbook, full pagewidth

12 V

6 MΩ

1 MΩ

VOLTAGE 5 V

REGULATOR

10

µF

PCF1252-X VDD

COMIN

COMOUT

SELECT

RESET

VSS

CT

1 nF

VDD

RESET

INT

MICROCONTROLLER/

MICROPROCESSOR

VSS

addres/data bus

R/W VDD

VRAM

MGC924

CHIP-

DECODING

LOGIC

RAM

CS

VSS

Fig.10 Data retention circuit for memory back-up systems.

handbook, full pagewidthVDD

external reset

input signal (1)

VDD

SELECT

RESET

PCF1252-X

COMIN

POWF

VSS

CT

10

µF

VDD

RESET

INT

MICROCONTROLLER/

MICROPROCESSOR

VSS

VSS

VDD

RAM

VSS

MGC925

(1) For external reset application, the SELECT input must be debounced.

Fig.11 Data retention circuit with external switchable reset for systems with a single voltage supply.

1998 Apr 16

9

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