DESCRIPTION
The M48T513Y/V TIMEKEEPER® RAM is a 512 Kb x 8 non-volatile static RAM and real time clock, with programmable alarms and a watchdog timer. The special DIP package provides a fully integrated battery back-up memory and real time clock solution. The M48T513Y/V directly replaces industry standard 512 Kb 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.

FEATURES SUMMARY
■ INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY, and CRYSTAL
■ YEAR 2000 COMPLIANT
■ BCD CODED CENTURY, YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS
■ BATTERY LOW WARNING FLAG
■ AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION
■ TWO WRITE PROTECT VOLTAGES: (VPFD = Power-fail Deselect Voltage)
   – M48T513Y: VCC = 4.5 to 5.5V
      4.2V ≤ VPFD ≤ 4.5V
   – M48T513V: VCC = 3.0 to 3.6V
      2.7V ≤ VPFD ≤ 3.0V
■ CONVENTIONAL SRAM OPERATION; UNLIMITED WRITE CYCLES
■ SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY APPLICATIONS
■ 10 YEARS OF DATA RETENTION and CLOCK OPERATION IN THE ABSENCE OF POWER
■ SELF CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE
■ MICROPROCESSOR POWER-ON RESET (Valid even during battery back-up mode)
■ PROGRAMMABLE ALARM OUTPUT ACTIVE IN BATTERY BACK-UP MODE
■ SURFACE-MOUNT (SMT) SOLUTION (Figure 2) INCLUDES A 44-PIN SOIC and A 32-LEAD TSOP (SNAPHAT® Top to be ordered separately)
■ SOIC PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT TOP WHICH CONTAINS THE BATTERY and CRYSTAL
■ SNAPHAT HOUSING (BATTERY/CRYSTAL) IS REPLACEABLE