General Description

The MAX6901 3-wire serial interface real-time clock in a TDFN package contains a real-time clock/calendar and 31 x 8 bits of static RAM (SRAM). The real-time clock/calendar provides seconds, minutes, hours, day, date, month, year, and century information.

Features

♦ Real-Time Clock Counts Seconds, Minutes, Hours, Day of Week, Date of Month, Month, Year, and Century
♦ Leap-Year Compensation Valid up to Year 2100
♦ Wide +2V to +5.5V Operating Voltage Range
♦ 3-Wire Serial Interface, 2MHz at 5V, 500kHz at 2V
♦ 31 x 8-Bit SRAM for Scratchpad Data Storage
♦ Uses Standard 32.768kHz, 12.5pF Watch Crystal
♦ Low Timekeeping Current (400nA at 2V)
♦ Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock Registers or SRAM
♦ 8-Pin 3mm x 3mm x 0.8mm TDFN Surface-Mount Package
♦ Push-Pull 32.768kHz Clock Output
♦ Programmable Time/Date Polled ALARM Function
♦ No External Crystal Bias Resistors or Capacitors Required

Applications

Point-of-Sale Equipment
Intelligent Instruments
Fax Machines
Battery-Powered Products
Portable Instruments