M48T59V Datasheet | STMicroelectronics

M48T59 M48T59Y/M48T59V 64 Kbit (8Kb x8) TIMEKEEPER® SRAM PRELIMINARY DATA s INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT and BATTERY s FREQUENCY TEST OUTPUT for REAL TIME CLOCK SOFTWARE CALIBRATION s AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION s WRITE PROTECT VOLTAGES (VPFD = Power-fail Deselect Voltage): - M48T59: 4.5V ≤ VPFD ≤ 4.75V - M48T59Y: 4.2V ≤ VPFD ≤ 4.5V - M48T59V: 2.7V ≤ VPFD ≤ 3.0V s SELF-CONTAINED BATTERY and CRYSTAL in the CAPHAT DIP PACKAGE s PACKAGING INCLUDES a 28-LEAD SOIC and SNAPHAT® TOP (to be Ordered Separately) s SOIC PACKAGE PROVIDES DIRECT CONNECTION for a SNAPHAT TOP which CONTAINS the BATTERY and CRYSTAL s MICROPROCESSOR POWER-ON RESET (Valid even during battery back-up mode) s PROGRAMMABLE ALARM OUTPUT ACTIVE in the BATTERY BACK-UP MODE s BATTERY LOW FLAG Table 1. Signal Names A0-A12 Address Inputs DQ0-DQ7 Data Inputs / Outputs IRQ/FT Interrupt / Frequency Test Output (Open Drain) Power Fail Reset Output (Open Drain) Chip Enable Output Enable Write Enable Supply Voltage Ground SNAPHAT (SH) Battery/Crytstal 28 28 SOH28 (MH) PCDIP28 (PC) Battery/Crystal CAPHAT Figure 1. Logic Diagram 13 A0-A12 8 DQ0-DQ7 M48T59 M48T59Y IRQ/FT...