The M41T56 is a 32 KHz serial real-time clock (RTC) with 56 bytes NVRAM
The M41T56 is a low-power, serial real-time clock (RTC) with 56 bytes of non-volatile RAM (NVRAM). It features a built-in 32,768 Hz oscillator controlled by an external crystal and uses a two-line, bidirectional serial bus for data transfer. The device includes automatic power-fail detection and switching to a battery supply to maintain timekeeping and data retention.
| Oscillator frequency | 32,768 Hz |
|---|---|
| NVRAM capacity | 56 bytes |
| Supply voltage | 2.5 V to 5 V |
| Battery supply current | 450 nA |
| Operating temperature | -40 °C to 85 °C |
| Package type | 8-lead SOIC |
The correct slave address is 0h.
Typical data retention time is in excess of 10 years with a 50 mAh, 3 V lithium cell.
Yes, it includes automatic leap year compensation.