memory products - Al Kossow's Bitsavers

MK48C02AI12A(K,N)-15/20/25AC ELECTRICAL CHARACTERISTICS (POWER-DOWN/POWER-UP TIMING)(OOC sT A s +70OC)SYM PARAMETER MIN MAXtF VPFD (Max) to VPFD (Min) Vee Fall Time 300tFB VpFD (Min) to Vso Vee Fall Time 10tRB Vso to VpFD (Min) Vee Rise Time 1tR VPFD (Min) to VPFD (Max) Vee Rise Time 0tREe E or W at V1H after VpFD (max) 120tpFX INT Low to Auto Deselect 10 40tpFH VPFD (Max) to INT High 120tFB VPFD (Min) to Vso 10UNITS NOTESfls 2flS 3fISflSflsflsfls 4flsDC ELECTRICAL CHARACTERISTICS (POWER-DOWN/POWER-UP TRIP POINT VOLTAGES)(OOC sT A s+70OC)SYM PARAMETER MINVPFD Power-fail Deselect Voltage (MK48C02A) 4.50VPFD Power-fail Deselect Voltage (MK48C12A) 4.20Vso Battery Back-up Switchover VoltageTYP MAX4.6 4.754.3 4.503UNITS NOTESV 1V 1V 1NOTES:1. All voltages referenced to GND.2. VpFD (Max) to VPFD (Min) fall times of less tF may result in deselectioniwriteprotection not occurring until 40 ,.8 after Vee passes VpFD (Min). VpFD(Max) to (Min) fall times of less than 10,.s may cause corruption of RAM data.3. VPFD (Min) to VSO fall times of less than tFB may cause corruption of RAM~.4. INT may go high anytime after Vee exceeds VPFD (min) and is guaranteedto go high tpFH after Vee exceeds VPFD (max).CAUTIONNegative Undershoots Below -0.3 volts are not allowedon any pin while in Battery Back-up mode.6110294