|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||

PT0222(02/06)

Ver: 0

1

Data Sheet

PT7C4300

Real-time Clock Module (I

Features

• Using external 32.768kHz quartz crystal

• Includes time (Hour/Minute/Second) and calendar

(Year/Month/Date/Day) counter functions (BCD

code)

• Automatic power-fail detect and switch circuitry of

battery backup

• Operating range: 2.0V to 5.5V

• Software clock calibration

• Ultra-low battery supply current of 1µA

Ordering Information

Part Number

Package

PT7C4300W

8-Pin SOIC

PT7C4300WE

Lead free 8-Pin SOIC

Description

The PT7C4300 serial real-time clock is a low-power

clock/calendar with a programmable square-wave output.

Address and data are transferred serially via a 2-wire

bidirectional bus. The clock/calendar provides seconds,

minutes, hours, day, date, month, and year information.

The date at the end of the month is automatically

adjusted for months with fewer than 31 days, including

corrections for leap year. The clock operates in the 24-

hour format indicator.

Table 1 shows the basic functions of PT7C4300. More

details are shown in section: overview of functions.

Table 1. Basic functions of PT7C4300

Item

Function

PT7C4300

Source: Crystal: 32.768kHz

√

Oscillator enable/disable

√

1

Oscillator

Oscillator fail detect

-

12-hour

-

Time display

24-hour

√

Century bit

√

2

Time

Time count chain enable/disable

√

3

Programmable square wave output (Hz)

512Hz

4

Programmable high/low level output

√

2-wire I

√

3-wire bus

-

5

Communicat

ion

Burst mode

-

6

Battery backup

√

7

Clock calibration

√