512 BIT (64B X 8) SERIAL ACCESS TIMEKEEPER SRAM The M41T56 is a serial real-time clock (RTC) manufactured by STMicroelectronics. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:
### **Specifications:**
- **Interface:** I²C (400 kHz)
- **Supply Voltage:** 1.3V to 4.4V (operating range)
- **Timekeeping Current:** 350 nA (typical at 3V)
- **Operating Temperature Range:** -40°C to +85°C
- **Clock Accuracy:** ±5 ppm (±0.432 s/day) at 25°C
- **Package Options:** SO8, TSSOP8
### **Descriptions:**
- The M41T56 is a low-power serial real-time clock with a built-in 32.768 kHz oscillator.
- It provides timekeeping functions (seconds, minutes, hours, day, date, month, year) with leap-year compensation up to 2099.
- Includes a programmable alarm and watchdog timer.
- Features a power-fail detection circuit and automatic switchover to backup supply.
### **Features:**
- **Low Power Consumption:** Ultra-low battery current (350 nA typical).
- **Battery Backup:** Operates from a backup supply when main power fails.
- **I²C Interface:** Supports standard (100 kHz) and fast (400 kHz) modes.
- **Timekeeping Functions:** Tracks time in 12-hour or 24-hour format with leap-year correction.
- **Alarm Function:** Programmable alarm with interrupt output.
- **Watchdog Timer:** Configurable timeout period.
- **Power-Fail Detection:** Monitors VCC and switches to backup mode automatically.
This information is based on the manufacturer's datasheet and technical documentation.
