STMicroelectronics M48Z35-70PC1 Timekeeper SRAM

The M48Z35-70PC1 is a 256 Kbit (32K x 8) Timekeeper SRAM, which is a highly integrated battery-backed memory module from STMicroelectronics. This innovative product combines a CMOS SRAM, a real-time clock (RTC), a quartz crystal, and a lithium battery all in a single PowerCap package. It is designed to maintain full functionality and data retention in the absence of an external power supply, making it an ideal solution for systems requiring reliable non-volatile memory and an accurate time base.

The real-time clock is a highly accurate, self-contained timekeeper that is capable of tracking time down to seconds, minutes, hours, day, date, month, and year, with leap year compensation valid up to the year 2100. The RTC functionality is crucial for applications that require precise timekeeping, such as data logging systems, industrial controllers, and point-of-sale terminals.

The M48Z35-70PC1 operates at a voltage range of 4.5V to 5.5V and features a fast access time of 70ns, ensuring quick read and write operations to the SRAM, which is essential for high-performance applications. The PowerCap package not only provides physical protection to the integrated battery and crystal but also allows for easy surface mounting on a printed circuit board, facilitating compact and robust designs.

One of the key features of the M48Z35-70PC1 is its integrated, long-life lithium battery. This battery ensures that data is retained and the real-time clock continues to function for a minimum of 10 years in the absence of external power. This feature is particularly important for applications where long-term reliability is paramount, such as in embedded systems, utility meters, and security systems.

The device also includes automatic power-fail chip deselect and write protection, ensuring data integrity during power transitions. Additionally, the M48Z35-70PC1 offers a BYTEWIDE™ control signal, allowing the user to easily switch between byte-wide and word-wide modes, providing flexibility for various system designs.

In summary, the STMicroelectronics M48Z35-70PC1 Timekeeper SRAM is a versatile and reliable memory solution that combines the practicality of non-volatile storage with the precision of an RTC, making it an excellent choice for a wide range of applications that require both data retention and accurate timekeeping capabilities.