Description
The M48T59/Y/V TIMEKEEPER® RAM is an 8 Kb 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
■ Frequency test output for real-time clock
    software calibration
■ Automatic power-fail chip deselect and WRITE
    protection
■ WRITE protect voltages
    (VPFD = Power-fail deselect voltage):
    – M48T59: VCC = 4.75 to 5.5 V
        4.5 V ≤ VPFD ≤ 4.75 V
    – M48T59Y: VCC = 4.5 to 5.5 V
        4.2 V ≤ VPFD ≤ 4.5 V
    – M48T59V(a): VCC = 3.0 to 3.6 V
        2.7 V ≤ VPFD ≤ 3.0 V
■ 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 top which contains the battery and
    crystal
■ Microprocessor power-on reset (valid even
    during battery back-up mode)
■ Programmable alarm output active in the
    battery back-up mode
■ Battery low flag
■ RoHS compliant
    – Lead-free second level interconnect