STMicroelectronics M48T08-100PC1 Timekeeper SRAM

The M48T08-100PC1 is a high-performance 64 Kbit Timekeeper SRAM manufactured by STMicroelectronics. This integrated device combines a static RAM with a software-compatible real-time clock, a crystal, and a power-fail control circuit, all in a single 28-pin DIP package. This unique combination of elements makes it an ideal solution for systems that require reliable data storage and precise timekeeping, even in the absence of power.

At the heart of the M48T08-100PC1 is a 8K x 8 non-volatile static RAM, which provides a dependable storage solution for critical data. The data is maintained by an onboard lithium battery that can ensure data retention for over 10 years. The real-time clock (RTC) provides a full complement of features including seconds, minutes, hours, day, date, month, and year, with automatic leap year adjustment up to the year 2099.

The device offers a robust feature set, including a programmable alarm and interrupt function, which can be used to initiate system wake-up procedures. The clock accuracy is maintained within ±1 minute/month at 25°C, thanks to the stable on-chip oscillator. The M48T08-100PC1 operates at a 5V ±10% power supply voltage, and its access time of 100 ns allows for quick data retrieval, making it suitable for high-performance applications.

One of the key features of the M48T08-100PC1 is its integrated power-fail chip-enable (CE) and write-enable (WE) control circuit, which ensures data integrity during power transitions. The power-fail deselect circuitry provides data protection by automatically switching to battery backup mode during power failures. This seamless transition ensures that both the SRAM and RTC continue to function without any loss of data or time.

Designed for applications that require long-term data and time retention without external power, the M48T08-100PC1 is widely used in industrial control systems, utility meters, security systems, network servers, and other embedded systems. Its reliable battery-backed SRAM and integrated RTC make it a versatile and essential component for maintaining system integrity and performance.

Key Features:

• 64 Kbit (8K x 8) non-volatile SRAM
• Integrated power-fail chip-enable and write-enable control
• Automatic power-fail chip deselect and write protection
• Self-contained battery and crystal in DIP package
• More than 10 years of data retention
• Programmable alarm and interrupt function
• Accurate automatic leap year compensation