🎄 Join our holiday celebration with $5.99 flat-rate shipping until December 12th! 🎄



Serial real-time clock (RTC) with alarm

Quantity $ per Unit Savings
1 - 9$3.090%
10 - 24$2.7710%
25 - 50$2.6315%
Contact Sales
Out of stock
Parameter NameParameter Value
Operating RangeIndustrial
Supply Voltage Min Volt2.0
Supply Voltage Max Volt5.5
Operating Temp Min Celsius-40.0
Operating Temp Max Celsius85.0
Packing TypeTape And Reel
RoHs compliantEcopack1
Package NameSO-8

The M41T80 is a low power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). Eight registers are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 registers provide status/control of alarm, 32 KHz output, and square wave functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.

Functions available to the user include a time-of-day clock/calendar, alarm interrupts, 32 KHz output, and programmable square wave output. The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically.

The M41T80 is supplied in an 8-pin SOIC.

Key features
  • Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
  • 32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation
  • Serial interface supports I2C bus (400 kHz)
  • 2.0 to 5.5 V clock operating voltage
  • 32 KHz square wave on power-up to drive a microcontroller in low-power mode
  • Programmable (1 Hz to 32 KHz) square wave
  • Programmable alarm and interrupt function
  • Low operating current of 200 μA
  • Operating temperature of –40 to 85 °C
  • ECOPACK®package available