The M41T80 is a serial access RTC chip with alarms. It operates at a voltage of 2.0-5.5V and has counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century. It supports the I2C bus (400KHz) and has programmable alarm and interrupt functions. It has a working current of 200µA and a working temperature of -40 to 85°C.
The M41T80 Serial Access RTC with Alarms is a low‑power real‑time clock that includes a built‑in 32.768 kHz crystal oscillator. It offers BCD‑coded time and calendar registers, programmable alarm functions, a 32 kHz output, and a square‑wave output, all accessed via a two‑wire I²C bus.
Key specifications include a supply voltage range of 2.0 V to 5.5 V, operating temperature from –40 °C to 85 °C, and a typical operating current of 200 µA. The device is supplied in an 8‑pin SOIC package and provides 20 addressable registers for timekeeping and alarm control.
| Supply Voltage (VCC) | 2.0 to 5.5 V |
|---|---|
| Operating Temperature | -40 to 85 °C |
| Storage Temperature (VCC Off, Oscillator Off) | -55 to 125 °C |
| Typical Operating Current | 200 µA |
| Input Capacitance | 7 pF |
| Output Capacitance | 10 pF |
| Crystal Resonant Frequency | 32.768 kHz |
The device operates from 2.0 V to 5.5 V.
It can operate from –40 °C to 85 °C.
The M41T80 provides 20 addressable registers (bytes).