PCF1252-3 datasheet(2/16 Pages) PHILIPS

2 / 16 page

1998 Apr 16

Philips Semiconductors

Product speciﬁcation

Threshold detector and reset generator

PCF1252-X family

FEATURES

• Very low current consumption, typically 10 µA

• 10 factory programmed threshold voltages available

covering trip voltages from 4.75 to 2.55 V

•±50 mV trip point accuracy over full temperature range

• Variable RESET delay

• RESET pulse polarity selection

• Defined outputs at 0.6 V (typ.)

• Comparator for second level detection

(e.g. overvoltage detection)

• Advance warning of power fail

• Operating temperature range −40 to +85 °C.

GENERAL DESCRIPTION

The PCF1252-Xs are low-power CMOS voltage threshold

detectors designed especially for supervision of

microcontroller/microprocessor systems for detection of

power-on/off conditions and generation of a system reset

pulse. The PCF1252-X also provides a POWF (power fail)

output which is activated at a precise factory-programmed

trip point. A system RESET output has a built-in delay with

duration determined by an external capacitor (CCT).

A second comparator (comparator 2) has been included to

enable the possibility of a second monitoring point in the

system.

ORDERING INFORMATION

Note

1. X = 0 to 9; depending on threshold voltage.

BLOCK DIAGRAM

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCF1252-XP(1)

DIP8

plastic dual in-line package; 8 leads (300 mil)

SOT97-1

PCF1252-XT(1)

SO8

plastic small outline package; 8 leads; body width 3.9 mm

SOT96-1

Fig.1 Block diagram.

handbook, full pagewidth

−

COMIN

comparator 2

PCF1252-X

SELECT

RESET

POWF

COMOUT

MGC915

1.30 V

comparator 1

DELAY

VDD

VSS

PCF1252-3 Datasheet(PDF) 2 Page - NXP Semiconductors

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