STMicroelectronics M41T81
The M41T81 is a low-power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T81 has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs.| Part No. | M41T81 |
|---|---|
| Datasheet | M41T81 Download |
| Manufacturer |  STMicroelectronics |
| Description | Serial access real-time clock |
| Buy | Stock & Price |
FEATURES
● For all new designs use M41T81S● 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 protocol)
● Ultra-low battery supply current of 0.6 ΜA (typ at 3 V)
● 2.0 to 5.5 V clock operating voltage
● Automatic switchover and deselect circuitry (for 3 V application select M41T81S datasheet)
● Power-down time stamp (HT bit) allowing determination of time elapsed in battery backup
● Programmable alarm and interrupt function (valid even during battery backup mode)
● Accurate programmable watchdog timer (from 62.5 ms to 128 s)
● Software clock calibration to compensate crystal deviation due to temperature
● Operating temperature of –40 to 85 °C
● ECOPACK® package available Datasheet - production data
DESCRIPTION
Eight bytes of the SRAM are used for the clock/calendar function and are configured in binary-coded decimal (BCD) format.
