STMicroelectronics M48T129Y-70PM1 Timekeeper RAM

The M48T129Y-70PM1 is a high-performance 3.3V 1Mbit (128Kb x8) Timekeeper SRAM manufactured by STMicroelectronics. This integrated device combines a versatile 128K x 8 non-volatile static RAM with a real-time clock, a crystal, a voltage reference, and an intelligent battery backup switching circuitry. Its unique feature set makes it ideal for applications requiring a reliable data storage and precise timekeeping functionalities in a single package.

Key Features

• Integrated Real-Time Clock (RTC): The device comes with a built-in RTC that maintains seconds, minutes, hours, day, date, month, and year information with leap year compensation valid up to 2100.
• Non-Volatile SRAM: The 128K x 8 static RAM provides a reliable storage solution that retains data in the absence of a power source, thanks to its self-contained battery.
• Automatic Battery Switching: The M48T129Y-70PM1 includes a smart battery switching circuitry that automatically switches to the battery supply when the main power fails, ensuring uninterrupted operation.
• Low Power Consumption: Designed for energy efficiency, it operates on a low power supply voltage of 3.3V, which helps to minimize overall power usage.
• Watchdog Timer: A programmable watchdog timer is included to reset an unresponsive system and ensure system reliability.
• Software Controlled Clock Calibration: For precise timekeeping, the clock can be calibrated via software to account for crystal aging and temperature variations.

Applications

The M48T129Y-70PM1 is suitable for a wide range of applications that require both non-volatile memory and an RTC. These include:

• Industrial control systems
• Utility meters
• POS terminals
• Network routers and switches
• Medical equipment
• Security systems

With its robust design and a battery life of over 10 years, the M48T129Y-70PM1 ensures data and timekeeping integrity over a long period, making it a reliable choice for critical applications where maintaining accurate time and data is paramount.