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M48T58Y Datasheet(PDF) 1 Page - STMicroelectronics |
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M48T58Y Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 17 page M48T58 M48T58Y 64 Kbit (8Kb x8) TIMEKEEPER ® SRAM July 1999 1/17 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: 4.5V ≤ VPFD ≤ 4.75V – M48T58Y: 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 TOP which CONTAINS the BATTERY and CRYSTAL PIN and FUNCTION COMPATIBLE with JEDEC STANDARD 8K x 8 SRAMs DESCRIPTION The M48T58/58Y TIMEKEEPER® RAM is an 8K 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. AI01374B 13 A0-A12 W DQ0-DQ7 VCC M48T58 M48T58Y G E2 VSS 8 E1 FT Figure 1. Logic Diagram A0-A12 Address Inputs DQ0-DQ7 Data Inputs / Outputs FT Frequency Test Output (Open Drain) E1 Chip Enable 1 E2 Chip Enable 2 G Output Enable W Write Enable VCC Supply Voltage VSS Ground Table 1. Signal Names 28 1 PCDIP28 (PC) Battery/Crystal CAPHAT SNAPHAT (SH) Battery/Crystal 28 1 SOH28 (MH) |
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