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AS4C256K16E0-30 Datasheet(PDF) 4 Page - Alliance Semiconductor Corporation |
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AS4C256K16E0-30 Datasheet(HTML) 4 Page - Alliance Semiconductor Corporation |
4 / 24 page ® AS4C256K16E0 4/11/01; v.1.1 Alliance Semiconductor 4 of 24 AC parameters common to all waveforms Shaded areas contain advance information. Read cycle Shaded areas contain advance information. Std Symbol Parameter -30 -35 -50 Unit Notes Min Max Min Max Min Max tRC Random read or write cycle time 65 –70–85 – ns tRP RAS precharge time 25 –25–25 – ns tRAS RAS pulse width 30 75K 35 75K 50 75K ns tCAS CAS pulse width 5 –6 – 10 – ns tRCD RAS to CAS delay time 15 20 16 24 15 35 ns 6 tRAD RAS to column address delay time 10 14 11 17 15 25 ns 7 tRSH(R) CAS to RAS hold time (read cycle) 10 –10–10 – ns tCSH RAS to CAS hold time 30 –35–50 – ns tCRP CAS to RAS precharge time 5 –5 –5 – ns tASR Row address setup time 0 –0 –0 – ns tRAH Row address hold time 5 –6 –9 – ns tT Transition time (rise and fall) 1.5 50 1.5 50 3 50 ns 4,5 tREF Refresh period – 8– 8–8 ms 3 tCLZ CAS to output in low Z 0 –0 –3 – ns 8 Std Symbol Parameter -30 -35 -50 Unit Notes Min Max Min Max Min Max tRAC Access time from RAS – 30 – 35 – 50 ns 6 tCAC Access time from CAS – 10 – 10 – 10 ns 6,13 tAA Access time from address – 16 – 18 – 25 ns 7,13 tAR(R) Column add hold from RAS 26 –28 – 30 – ns tRCS Read command setup time 0 –0 – 0 – ns tRCH Read command hold time to CAS 0 –0 – 0 – ns 9 tRRH Read command hold time to RAS 0 –0 – 0 – ns 9 tRAL Column address to RAS Lead time 16 –18 – 25 – ns tCPN CAS precharge time 3 –4 – 5 – ns tOFF Output buffer turn-off time 0 80 8 0 8 ns 8,10 |
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