Completely Manages All Timekeeping Functions RTC Counts Seconds, Minutes, Hours, Day of Week, Date of Month, Month, Year, and Century Leap-Year Compensation 31 x 8-Bit SRAM for Scratchpad Data Storage Programmable Time/Date Polled ALARM Function Uses Standard 32.768kHz Watch Crystal Low-Power Operation Extends Battery Life Low Timekeeping Current (400nA at 2V) +2V to +5.5V Wide Operating Voltage Range Standard Serial Port Interfaces with Most Microcontrollers SPI (Mode 1 or 3) Interface: 4MHz at 5V, 1MHz at 2V Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock Registers or SRAM 3mm x 3mm x 0.8mm, 8-Pin TDFN Package Minimizes Required Space No External Crystal Bias Resistors or Capacitors Required Applications Battery-Powered Products Fax Machines Intelligent Instruments Point-of-Sale Equipment Portable Instruments
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