DS1305E-T Datasheet PDF - Dallas Semiconductor -> Maxim Integrated

FEATURES
● Real time clock counts seconds, minutes, hours, date of the month, month, day of the week and year with leap year compensation valid up to 2100
● 96-byte nonvolatile RAM for data storage
● Two time-of-day alarms programmable on combination of seconds, minutes, hours and day of the week
● Serial interface supports Motorola serial peripheral interface (SPI) serial data ports or standard 3-wire interface
● Burst mode for reading/writing successive addresses in clock/RAM
● Dual power supply pins for primary and backup power supplies
● Optional trickle charge output to backup supply
● 2.0 - 5.5V operation
● Optional industrial temperature range -40°C to +85°C
● Available in space-efficient, 20-pin TSSOP package
● Recognized by Underwriters Laboratory