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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AS4LC256K16EO датащи(PDF) 5 Page - Alliance Semiconductor Corporation |
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AS4LC256K16EO датащи(HTML) 5 Page - Alliance Semiconductor Corporation |
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5 / 25 page  ® AS4LC256K16EO 4/11/01; V.1.1 Alliance Semiconductor P. 5 of 25 AC parameters common to all waveforms Read cycle Std Symbol Parameter -35 -45 -60 Unit Notes Min Max Min Max Min Max tRC Random read or write cycle time 50 – 80 – 100 – ns tRP RAS precharge time 15 – 20 – 20 – ns tRAS RAS pulse width 35 75K 45 75K 60 75K ns tCAS CAS pulse width 6 – 10 – 10 – ns tRCD RAS to CAS delay time 12 18 18 32 15 45 ns 6 tRAD RAS to column address delay time 8 14 13 23 15 30 ns 7 tRSH(R) CAS to RAS hold time (read cycle) 10 – 10 – 12 – ns tCSH RAS to CAS hold time 35 – 45 – 60 – 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 6 – 8 – 9 – ns tT Transition time (rise and fall) 1.5 50 1.5 50 1.5 50 ns 4,5 tREF Refresh period – 8 – 8 – 8 ms 3 tCLZ CAS to output in low Z 0 – 3 – 3 – ns 8 Std Symbol Parameter -35 -45 -60 Unit Notes Min Max Min Max Min Max tRAC Access time from RAS –35 – 45 – 60 ns 6 tCAC Access time from CAS – 7 – 10 – 10 ns 6,13 tAA Access time from address – 17 – 22 – 30 ns 7,13 tAR(R) Column add hold from RAS 28 – 35 – 40 – 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 18 – 25 – 30 – ns tCPN CAS precharge time 4 – 5 – 5 – ns tOFF Output buffer turn-off time 0 8 0 10 0 10 ns 8,10 |
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