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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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AS4CM4EOQ 数据表(PDF) 6 Page - Alliance Semiconductor Corporation |
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AS4CM4EOQ 数据表(HTML) 6 Page - Alliance Semiconductor Corporation |
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6 / 16 page  AS4C4M4EOQ AS4C4M4E1Q ® 3/22/01; v.1.0 Alliance Semiconductor P. 6 of 16 AC parameters common to all waveforms Read cycle Symbol Parameter -50 -60 Unit Notes Min Max Min Max tRC Random read or write cycle time 80 – 100 – ns tRP RAS precharge time 30 – 40 – ns tRAS RAS pulse width 50 10K 60 10K ns tCAS CAS pulse width 8 10K 10 10K ns tRCD RAS to CAS delay time 15 35 15 43 ns 6 tRAD RAS to column address delay time 12 25 12 30 ns 7 tRSH CAS to RAS hold time 10 – 10 – ns tCSH RAS to CAS hold time 40 – 50 – ns tCRP CAS to RAS precharge time 5 – 5 – ns tASR Row address setup time 0 – 0 – ns tRAH Row address hold time 8 – 10 – ns tT Transition time (rise and fall) 1 50 1 50 ns 4,5 tREF Refresh period – 32/64 – 32/64 ms 17/16 tCP CAS precharge time 8 – 10 – ns tRAL Column address to RAS lead time 25 – 30 – ns tASC Column address setup time 0 – 0 – ns tCAH Column address hold time 8 10 – ns Symbol Parameter -50 -60 Unit Notes Min Max Min Max tRAC Access time from RAS –50 – 60 ns 6 tCAC Access time from CAS – 12 – 15 ns 6,13 tAA Access time from address – 25 – 30 ns 7,13 tRCS Read command setup time 0 – 0 – ns tRCH Read command hold time to CAS 0– 0– ns 9 tRRH Read command hold time to RAS 0– 0– ns 9 |
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