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PT7C4307PE

Real-time Clock Module (I2C Bus)

Pericom Semiconductor 

Preliminary Data Sheet

PT7C4307

Real-time Clock Module (I2C Bus)

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Product Features

Product Description

• Using external 32.768kHz quartz crystal

• Supports I2C-Bus's high speed mode (400 kHz)

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

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

code)

• Programmable square wave output signal

• 56-byte, battery-backed, nonvolatile (NV) RAM for

data storage

• Automatic power-fail detect and switch circuitry of

battery backup

• Consumes less than 500nA in battery backup mode

with oscillator running

Ordering Information

Part Number

Package

PT7C4307P

8-Pin DIP

PT7C4307W

8-Pin SOIC

Note: Lead free package is available by adding “E” after each

part number. For example: PT7C4307PE.

The PT7C4307 serial real-time clock is a low-power

clock/calendar with a programmable square-wave output

and 56 bytes of nonvolatile RAM.

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 either the

24-hour or 12-hour format with AM/PM indicator.

The PT7C4307 has a built-in power sense circuit that

detects power failures and automatically switches to the

battery supply.

Table 1 shows the basic functions of PT7C4307. More

details are shown in section: overview of functions.

Table 1. Basic functions of PT7C4307

Item

Function

Source: Crystal: 32.768kHz

1

Oscillator Oscillator enable/disable

Oscillator fail detect

2

Time

Time display

12-hour

24-hour

Century bit

3

Alarm interrupt

4

Programmable square wave output (Hz)

5

RAM

6

Battery backup

PT7C4307

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1, 4.096k, 8.192k, 32.768k

56×8

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PT0206(02/05)

1

Ver: 0

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