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AS4C64M32MD1 Datasheet(PDF) 39 Page - Alliance Semiconductor Corporation |
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AS4C64M32MD1 Datasheet(HTML) 39 Page - Alliance Semiconductor Corporation |
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39 / 43 page  AS4C64M32MD1 Confidential Page 39 V.1.0 Sept. 2014 AC CHARACTERISTICS -5 PARAMETER SYMBOL MIN MAX UNITS NOTES Output data access time from CK/CK t AC 2 5 ns 3 CK high-level width t CH 0.45 0.55 t CK CK low-level width t CL 0.45 0.55 t CK Clock cycle time CL = 3 t CK (3) 5 - ns 1 DQ and DM input hold time relative to DQS t DH 0.4 ns 5,6 DQ and DM input setup time relative to DQS t DS 0.4 ns 5,6 DQ and DM input pulse width (for each input) t DIPW 1.4 ns Access window of DQS from CK/CK t DQSCK 2 5 ns DQS input high pulse width t DQSH 0.4 0.6 t CK DQS input low pulse width t DQSL 0.4 0.6 t CK DQS-DQ skew, DQS to last DQ valid, t DQSQ 0.4 ns 1 per group, per access Write command to first DQS latching t DQSS 0.7 1.2 t CK transition Half clock period t HP t CH, ns t CL Data-out high-impedance window t HZ 0.4 0.6 t CK from CK/CK Data-out low-impedance window t LZ 1 ns from CK/CK Address and control input hold time t IH 0.9 ns 1 Address and control input setup time t IS 0.9 ns 1 LOAD MODE REGISTER command t MRD 2 t CK cycle time DQ-DQS hold, DQS to first DQ to go t QH t HP ns non-valid, per access - t QHS Data hold skew factor t QHS 0.5 ns ACTIVE to PRECHARGE command t RAS 40 70K ns ACTIVE to READ with Auto precharge t RAP 15 ns command ACTIVE to ACTIVE/AUTO REFRESH t RC 55 ns command period AUTO REFRESH command period t RFC 72 ns ACTIVE to READ or WRITE delay t RCD 15 ns PRECHARGE command period t RP 15 ns AC Timing Parameters & Specification |
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