PCF8573T datasheet(3/24 Pages) PHILIPS

3 / 24 page

1997 Mar 28

Philips Semiconductors

Product speciﬁcation

Clock/calendar with Power Fail Detector

PCF8573

FEATURES

• Serial input/output I2C-bus interface for minutes, hours,

days and months

• Additional pulse outputs for seconds and minutes

• Alarm register for presetting a time for alarm or remote

switching functions

• On-chip power fail detector

• Separate ground pin for the clock allows easy

implementation of battery back-up during supply

interruption

• Crystal oscillator control (32.768 kHz)

• Low power consumption.

GENERAL DESCRIPTION

The PCF8573 is a low threshold, CMOS circuit that

functions as a real time clock/calendar. Addresses and

data are transferred serially via the two-line bidirectional

I2C-bus.

The IC incorporates an addressable time counter and an

addressable alarm register for minutes, hours, days and

months. Three special control/status flags, COMP, POWF

and NODA, are also available. Back-up for the clock during

supply interruptions is provided by a 1.2 V nickel cadmium

battery. The time base is generated from a 32.768 kHz

crystal-controlled oscillator.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL

PARAMETER

MIN.

TYP.

MAX.

UNIT

VDD − VSS1

supply voltage, clock (pin 16 to pin 15)

1.1

−

6.0

VDD − VSS2

supply voltage, I2C-bus (pin 16 to pin 8)

2.5

−

6.0

fosc

crystal oscillator frequency

−

32.768

−

kHz

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCF8573P

DIP16

plastic dual in-line package; 16 leads (300 mil); long body

SOT38-1

PCF8573T

SO16

plastic small outline package; 16 leads; body width 7.5 mm

SOT162-1

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