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SUMMARY DESCRIPTION

The M48T35AY/V TIMEKEEPER? RAM is a 32Kb 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. The M48T35AY/V is a non-volatile pin and func

tion equivalent to any JEDEC standard 32Kb 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.

FEATURES SUMMARY

■ 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):

– M48T35AY: VCC= 4.5 to 5.5V

4.2V ≤ VPFD ≤4.5V

– M48T35AV: VCC= 3.0 to 3.6V

2.7V ≤ VPFD ≤ 3.0V

■ SELF-CONTAINED BATTERY AND CRYSTAL IN THE CAPHAT? DIP PACKAGE

■ SOIC PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT? HOUSING CONTAINING THE BATTERY AND CRYSTAL

■ SNAPHAT? HOUSING (BATTERY AND CRYSTAL) IS REPLACEABLE

■ PIN AND FUNCTION COMPATIBLE WITH JEDEC STANDARD 32Kb x8 SRAMs