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PT7C4302

Real-time Clock Module (3-wire Interface)

Pericom Semiconductor Corporation 

Data Sheet

PT7C4302

Real-time Clock Module (3-wire Interface)

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Features

Description

• Using external 32.768kHz quartz crystal

• Real-time clock (RTC) counts seconds, minutes

hours, date of the month, month, day of the week,

and year with leap-year compensation valid up to

2099

• 31-byte, nonvolatile (NV) RAM for data storage

• 2.0V to 5.5V full operation

• Uses less than 300nA at 2.0V

• Simple 3-wire interface

• Serial I/O for minimum pin count

• Burst mode for reading/writing successive addresses

in clock/RAM

• TTL-compatible (VCC = 5V)

• Optional industrial temperature range: -40°C to

+85°C

• Battery backup

• Trickle charger on chip for rechargeable energy

source backup

The PT7C4302 serial real-time clock is a low-

power clock/calendar with a programmable square-wave

output and 31 bytes of nonvolatile RAM.

Address and data are transferred serially via a 3-

wire 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.

Table 1 shows the basic functions of PT7C4302.

More details are shown in section: overview of functions.

Ordering Information

Part Number

Package

PT7C4302P

8-Pin DIP

PT7C4302W

8-Pin SOIC

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

part number. For example: PT7C4302PE.

Table 1 Basic functions of PT7C4302

Item

Function

Source: Crystal: 32.768kHz

1

Oscillator Oscillator enable/disable

Oscillator fail detect

2

Time

Time display

Century bit

12-hour

24-hour

Time count chain enable/disable

2-wire I2C bus

Communicat

3

3-wire bus

ion

Burst mode

Write protection

4

Control

External clock test mode

Power-on reset override

5

RAM

6

Charger

7

Battery backup

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