The M48Z35/Y ZEROPOWER? RAM is a 32 K x 8, non-volatile static RAM that integrates powerfail deselect circuitry and battery control logic on a single die. The monolithic chip is available in two special packages to provide a highly integrated battery-backed memory solution. The M48Z35/Y is a non-volatile pin and function equivalent to any JEDEC standard 32 K x 8 SRAM. It also easily fits into many ROM, EPROM, and EEPROM sockets, providing the non-volatility of PROMs without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed. The 28-pin 600 mil DIP CAPHAT? houses the M48Z35/Y silicon with a long life lithium button cell in a single package

The M4Txx-BR12SH SNAPHAT? top is a detachable lithium power source for ST?s serial real-time clock and non-volatile TIMEKEEPER? surface-mount SOIC package (28- and 44-pin). The SNAPHAT top contains both the battery and crystal and is designed to be ?snapped on? after the SOIC is surface mounted on the PC board. Thus the two-piece solution prevents the battery and crystal from being exposed to the high SNAPHAT temperatures of the surface-mount process.