Description

The PT7C4302 serial real-time clock is a low power clock/calendar with a programmable square-wave output and 31 bytes of nonvolatile RAM.

Features

• 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