M48Z129Y

The M48Z129Y/V ZEROPOWER SRAM is a 1,048,576 bit non-volatile static RAM organized as 131,072 words by 8 bits. The device combines an internal lithium battery, a CMOS SRAM and a control circuit in a plastic 32 pin DIP Module. The
M48Z129Y/V directly replaces industry standard 128K x 8 SRAM. It also provides the non-volatility of FLASH without any requirement for special write timing or limitations on the number of writes that can be performed.

The M48Z129Y/V also has its own Power-Fail Detect circuit. This control circuitry constantly monitors the supply voltage for an out of tolerance condition. When _VCC is out of tolerance, the circuit write protects the SRAM, providing data security in the midst of unpredictable system operation. As V_CC falls, the control circuitry automatically switches to the battery, maintaining data until valid power is restored.