256 Kbit 32K x8 SERIAL RTC The **M41T256YMT7TR** is a serial real-time clock (RTC) manufactured by **STMicroelectronics (STM)**. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Interface:** I²C (400 kHz)
- **Memory Type:** SRAM (256 Kbit, 32K x 8)
- **Timekeeping Accuracy:** ±2 ppm (at 25°C)
- **Operating Voltage:** 1.7V to 5.5V
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** 28-pin SOIC (SO-28)
- **Battery Backup:** Supports battery or supercapacitor backup
- **Clock Frequency:** 32.768 kHz
- **Low Power Consumption:** 400 nA in battery mode (typical)
### **Descriptions:**
- The **M41T256YMT7TR** is a low-power serial RTC with an integrated 256 Kbit SRAM.
- It provides accurate timekeeping with automatic leap-year compensation.
- Features a built-in power-fail detection circuit and switchover to backup supply.
- Suitable for applications requiring non-volatile timekeeping and data storage.
### **Features:**
- **I²C Serial Interface:** Supports standard (100 kHz) and fast (400 kHz) modes.
- **Battery Backup:** Maintains timekeeping and SRAM data during power loss.
- **Automatic Leap-Year Compensation:** Valid up to the year 2100.
- **Low Power Consumption:** Optimized for battery-powered applications.
- **Power-Fail Detection:** Monitors VCC and switches to backup supply when needed.
- **Industrial Temperature Range:** Operates reliably in harsh environments.
This device is commonly used in embedded systems, industrial controls, and consumer electronics requiring reliable timekeeping and data retention.
