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AS4C14400 Datasheet(PDF) 4 Page - Alliance Semiconductor Corporation |
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AS4C14400 Datasheet(HTML) 4 Page - Alliance Semiconductor Corporation |
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4 / 16 page  ® AS4C14400 4 AC parameters common to all waveforms Shaded areas contain advance information. Read cycle Shaded areas contain advance information. Symbol Parameter -40 -50 -60 -70 Unit Notes Min Max Min Max Min Max Min Max tRC Random read or write cycle time 70 – 90 –110 – 130 – ns tRP RAS precharge time 20 – 30 –40 – 50 – ns tRAS RAS pulse width 40 10K 50 10K 60 10K 70 10K ns tCAS CAS pulse width 10 – 13 –15 – 18 – ns tRCD RAS to CAS delay time 18 30 20 37 20 45 20 52 ns 6 tRAD RAS to column address delay time 13 20 15 25 15 30 15 35 ns 7 tRSH(R) CAS to RAS hold time (read) 10 – 13 –15 – 18 – ns tCSH RAS to CAS hold time 40 – 50 –60 – 70 – ns tCRP CAS to RAS precharge time 0 – 0 –0 –0– ns tASR Row address setup time 0 – 0 –0 –0– ns tRAH Row address hold time 8 – 10 –10 – 10 – ns tT Transition time (rise and fall) 2 50 2 50 2 50 2 50 ns 4,5 tREF Refresh period – 16 – 16 – 16 – 16 ms 3 tCLZ CAS to output in low Z 0 – 0 –0 –0– ns 8 Symbol Parameter -40 -50 -60 -70 Unit Notes Min Max Min Max Min Max Min Max tRAC Access time from RAS – 40 – 50 – 60 – 70 ns 6 tCAC Access time from CAS – 10 – 13 – 15 – 18 ns 6,13 tAA Access time from address – 20 – 25 – 30 – 35 ns 7,13 tAR(R) Column add hold from RAS 30 – 40 –45–55 – ns tRCS Read command setup time 0 – 0 –0–0– ns tRCH Read command hold time to CAS 0 – 0 –0–0– ns 9 tRRH Read command hold time to RAS 0 – 0 –0–0– ns 9 tRAL Column address to RAS lead time 20 – 25 –30–35 – ns tCPN CAS precharge time 5 – 10 –10–10 – ns tODS Output disable setup time 0 – 0 –0–0– ns tOFF Output buffer turn-off time 0 10 0 13 0 15 0 18 ns 8,10 |
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