Summary description
The M48T58/Y TIMEKEEPER® RAM is a 8Kb x 8 non-volatile static RAM and real time clock. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.

FEATUREs
■ Integrated, ultra low power SRAM, real time clock, power-fail control circuit and battery
■ BYTEWIDE™ RAM-like clock access
■ BCD coded year, month, day, date, hours, minutes, and seconds
■ Frequency test output for real time clock
■ Automatic power-fail chip deselect and write protection
■ Write protect voltages (VPFD = power-fail deselect voltage):
    – M48T58: VCC = 4.75 to 5.5V 4.5V ≤ VPFD ≤ 4.75V
    – M48T58Y: VCC = 4.5 to 5.5V 4.2V ≤ VPFD ≤ 4.5V
■ Self-contained battery and crystal in the CAPHAT™ dip package
■ Packaging includes a 28-lead SOIC and SNAPHAT® top (to be ordered separately)
■ SOIC package provides direct connection for a snaphat housing containing the battery and crystal
■ Pin and function compatible with JEDEC standard 8 Kb x8 SRAMs
■ RoHS compliant
    – Lead-free second level interconnect