3.3V-5V 1 MB (128K X 8) TIMEKEEPER SRAM The **M48T129Y-70PM1** is a **Timekeeper SRAM** manufactured by **STMicroelectronics (ST)**. Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Type:** Non-volatile SRAM (NVSRAM) with a built-in real-time clock (RTC).
- **Density:** 128 Kb (16 K × 8).
- **Access Time:** 70 ns.
- **Operating Voltage:** 4.5V to 5.5V.
- **Package:** 32-pin PowerCap Module (PM1).
- **Operating Temperature Range:** Commercial (0°C to +70°C).
- **Data Retention:** Minimum 10 years with power applied.
- **Clock Accuracy:** ±1 minute per month at 25°C.
### **Descriptions:**
- Combines **SRAM** and a **real-time clock (RTC)** in a single chip.
- **Non-volatile** due to an integrated lithium energy source that maintains data and clock operation during power loss.
- **Battery-backed SRAM** ensures data retention without external power.
- **Industrial-grade reliability** with a long-term lithium backup system.
### **Features:**
- **Automatic power-fail chip deselect** and write protection.
- **Battery status indicator** to monitor backup health.
- **Low-power CMOS technology** for reduced energy consumption.
- **Industrial-standard pinout** for compatibility.
- **Real-time clock** with seconds, minutes, hours, day, date, month, and year functions.
- **Leap-year compensation** up to 2100.
- **32.768 kHz crystal oscillator** for clock accuracy.
This device is commonly used in applications requiring **non-volatile memory with timekeeping**, such as industrial controllers, medical equipment, and embedded systems.
