M41T00S series clock is a low-power, low-cost I2C-compatible device that provides a 24-bit date/time counter and clock that can be used in analog and digital control, timing applications, measurement and test systems, and other systems requiring accurate time information.
The M41T00S is a low‑power serial access real‑time clock (RTC) with an integrated 32.768 kHz crystal‑controlled oscillator. It offers BCD‑coded calendar registers, automatic leap‑year handling, ultra‑low battery backup, and an I²C two‑wire serial interface for easy integration.
This manual includes a features summary, detailed pin‑out and package information, bus protocol description, read/write operation sequences, clock calibration, power‑fail detection, maximum ratings, and mechanical data. It also provides revision history and reference to related application notes.
| Operating voltage | 2.0 V to 5.5 V |
|---|---|
| Operating current | 300 µA |
| Battery standby current | 1 nA |
| Operating temperature | -40 °C to 85 °C |
| Oscillator frequency | 32.768 kHz |
| Battery backup type | Lithium button cell |
The device operates from 2.0 V up to 5.5 V.
In ultra‑low battery mode it draws only 1 nA.
It uses a two‑line bi‑directional I²C (2‑wire) interface for data transfer.