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M48T35AV-70PC6 Datasheet(PDF) 1 Page - STMicroelectronics |
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M48T35AV-70PC6 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 19 page 1/19 May 2000 M48T35AY M48T35AV 256 Kbit (32Kb x8) TIMEKEEPER® SRAM s INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT and BATTERY s BYTEWIDE™ RAM-LIKE CLOCK ACCESS s BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES and SECONDS s BATTERY LOW FLAG (BOK) s FREQUENCY TEST OUTPUT for REAL TIME CLOCK s AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION s WRITE PROTECT VOLTAGES (VPFD = Power-fail Deselect Voltage): – M48T35AY: 4.2V ≤ VPFD ≤ 4.5V – M48T35AV: 2.7V ≤ VPFD ≤ 3.0V s SELF-CONTAINED BATTERY and CRYSTAL in the CAPHAT DIP PACKAGE s SOIC PACKAGE PROVIDES DIRECT CONNECTION for a SNAPHAT HOUSING CONTAINING the BATTERY and CRYSTAL s SNAPHAT® HOUSING (BATTERY and CRYSTAL) is REPLACEABLE s PIN and FUNCTION COMPATIBLE with JEDEC STANDARD 32Kb x8 SRAMs DESCRIPTION The M48T35AY/35AV TIMEKEEPER® RAM is a 32Kb x8 non-volatile static RAM and real time clock. The monolithic chip is available in two spe- cial packages to provide a highly integrated bat- tery backed-up memory and real time clock solution. The M48T35AY/35AV is a non-volatile pin and function equivalent to any JEDEC standard 32Kb x8 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. Figure 1. Logic Diagram AI02797B 15 A0-A14 W DQ0-DQ7 VCC M48T35AY M48T35AV G VSS 8 E 28 1 28 1 SOH28 (MH) SNAPHAT (SH) Battery/Crystal PCDIP28 (PC) Battery/Crystal CAPHAT |
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