NXP PCF8583T/5,518, Real Time Clock (RTC), 240B RAM, 8-Pin SO8

The NXP PCF8583 is a clock and calendar chip, based on a 2048 bit static CMOS1 RAM organized as 256 words by 8 bits. Addresses and data are transferred serially via the two line bidirectional I2C bus. The built in word address register is incremented automatically after each written or read data byte.

Automatic word address incrementing
Programmable alarm, timer, and interrupt function