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Q67100-Q1044 Datasheet(PDF) 7 Page - Siemens Semiconductor Group |
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Q67100-Q1044 Datasheet(HTML) 7 Page - Siemens Semiconductor Group |
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7 / 22 page  Semiconductor Group 61 HYB 514256B/BL/BJ/BJL-50/-60/-70 256 K × 4-DRAM AC Characteristics 4) 13) T A = 0 to 70 ˚C; VCC = 5 V ± 10 %; tT = 5 ns Parameter Symbol Limit Values Unit -50 -60 -70 min. max. min. max. min. max. Random read or write cycle time t RC 95 – 110 – 130 – ns Read-modify-write cycle time t RWC 140 – 160 – 185 – ns Fast page mode cycle time t PC 35 – 40 – 45 – ns Fast page mode read-modify- write cycle time t PRWC 80 – 90 – 100 – ns Access time from RAS 6) 11) t RAC –50 – 60 –70 ns Access time from CAS 6) 11) t CAC –15 – 15 –20 ns Access time from column address 6) 12) t AA –25 – 30 –35 ns Access time from CAS precharge 6) 12) t CPA –30 – 35 –40 ns CAS to output in low-Z 4) t CLZ 0– 0– 0– ns Output buffer turn-off delay 7) t OFF 015 0 20 020 ns Transition time (rise and fall) 5) t T 350 3 50 350 ns RAS precharge time t RP 35 – 40 – 50 – ns RAS pulse width t RAS 50 10.000 60 10.000 70 10.000 ns RAS pulse width (fast page mode) t RASP 50 100.000 60 100.000 70 100.000 ns RAS hold time t RSH 15 – 15 – 20 – ns CAS hold time t CSH 50 – 60 – 70 – ns CAS pulse width t CAS 15 10.000 15 10.000 20 10.000 ns RAS hold time from CAS precharge (Fast Page Mode) t RHCP 30 – 35 – 45 – ns CAS precharge to WE delay time (FPM RMW) t CPWD 55 – 60 – 65 – ns RAS to CAS delay time 11) t RCD 20 35 20 45 20 50 RAS to column address delay time 12) t RAD 15 25 15 30 15 35 ns CAS to RAS precharge time t CRP 5– 5– 5– ns CAS precharge time t CP 10 – 10 – 10 – ns |
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