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VDS7608A4A-55 Datasheet(PDF) 6 Page - A-Data Technology |
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VDS7608A4A-55 Datasheet(HTML) 6 Page - A-Data Technology |
6 / 8 page V-Data VDS7608A4A AC Characteristics -5 -5.5 -6 -7 -7.5 Parameter Symbol Min Max Min Max Min Max Min Max Min Max Unit Note /CAS Latency = 3 tCK3 5 5.5 6 7 7.5 System clock Cycle time /CAS Latency = 2 tCK2 10 1000 10 1000 10 1000 10 1000 7.5 1000 ns Clock high pulse width tCHW 2 - 2.25 - 2.5 - 2.5 - 2.5 - ns 1 Clock low pulse width tCLW 2 - 2.25 - 2.5 - 2.5 - 2.5 - ns 1 /CAS Latency = 3 tAC3 - 4.5 - 5 - 5.4 - 5.4 - 5.4 Access time form clock /CAS Latency = 2 tAC2 - 6 - 6 - 6 - 6 - 5.4 ns 2 Operation tRC 55 - 55 - 60 - 62 - 65 - /RAS cycle time Auto Refresh tRRC 55 - 55 - 60 - 62 - 65 - ns /RAS to /CAS delay tRCD 15 - 16.5 - 18 - 20 - 15 - ns /RAS active time tRAS 40 100K 38.5 100K 42 100K 42 120K 45 120K ns /RAS precharge time tRP 15 - 16.5 - 18 - 20 - 15 - ns /RAS to /RAS bank active delay tRRD 10 - 11 - 12 - 14 - 15 - ns /CAS to /CAS delay tCCD 1 - 1 - 1 - 1 - 1 - CLK Write command to data – in delay tWTL 0 - 0 - 0 - 0 - 0 - CLK Data – in to precharge command tDPL 1 - 1 - 1 - 1 - 1 - CLK Data – in active command tDAL 5 - 5 - 5 - 4 - 4 - CLK DQM to data – out Hi-Z tDQZ 2 - 2 - 2 - 2 - 2 - CLK DQM to data – in mask tDQM 0 - 0 - 0 - 0 - 0 - CLK Data – out hold time tOH 1.5 - 2 - 2.7 - 2.7 - 2.7 - ns Data – input setup time tDS 1.5 - 1.5 - 1.5 - 1.5 - 1.5 - ns 1 Data – input hold time tDH 1 - 1 - 1 - 1 - 1 - ns 1 Address setup time tAS 1.5 - 1.5 - 1.5 - 1.5 - 1.5 - ns 1 Address hold time tAH 1 - 1 - 1 - 1 - 1 - ns 1 CKE setup time tCKS 1.5 - 1.5 - 1.5 - 1.5 - 1.5 - ns 1 CKE hold time tCKH 1 - 1 - 1 - 1 - 1 - ns 1 Command setup time tCS 1.5 - 1.5 - 1.5 - 1.5 - 1.5 - ns 1 Command hold time tCH 1 - 1 - 1 - 1 - 1 - ns 1 CLK to data output in low Z-time tOLZ 1 - 1 - 1 - 1.5 - 1.5 - ns MRS to new command tMRD 2 - 2 - 2 - 1 - 1 - CLK Power down exit time tPDE 1 - 1 - 1 - 1 - 1 - CLK Self refresh exit time tSRE 1 - 1 - 1 - 1 - 1 - CLK 3 Refresh time tREF 64 - 64 - 64 - 64 - 64 - ms Note : 1. Assume tR / tF (input rise and fall time) is 1 ns. 2. Access times to be measured with input signals of 1v / ns edge rate. 3.A new command can be given tRRC after self refresh exit. Rev 1 April, 2001 6 |
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