STMicroelectronics | M41T82RM6F

Eight bytes of the register map are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 17 bytes of the register map provide status/control of the two alarms, watchdog, 8-bit counter, and square wave functions. An additional seven bytes are made available as user SRAM. It has an Operating temperature ranges b/w -40 °C to 85 °C and available in a SO8 package.

Features:

• Ultra-low battery supply current of 365 nA
• Factory calibrated accuracy ±5 ppm guaranteed after 2 reflows (SOX18)
  • Much better accuracies achievable using built-in programmable analog and digital
    calibration circuits
• 2.0 V to 5.5 V clock operating voltage
• Counters for tenths/hundredths of seconds, minutes, hours, day, date, month, year, and century
• Automatic switchover and reset output circuitry (fixed reference)
  • M41T83S
    VCC = 3.00 V to 5.50 V
    (2.85 V ≤ VRST ≤ 3.00 V)
  • M41T83R
    VCC = 2.70 V to 5.50 V
    (2.55 V ≤ VRST ≤ 2.70 V)
  • M41T83Z
    VCC = 2.38 V to 5.50 V
    (2.25 V ≤ VRST ≤ 2.38 V)
• Serial interface supports I2C bus (400 kHz protocol)
• Programmable alarm with interrupt function (valid even during battery backup mode)
• Optional 2nd programmable alarm available
• Square wave output defaults to 32 KHz on power-up (M41T83 only)
• RESET (RST) output
• Watchdog timer
• Programmable 8-bit counter/timer
• 7 bytes of battery-backed user SRAM
• Battery low flag
• Low operating current of 80 μA