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WV3H2256M72AER665D6SG Datasheet(PDF) 8 Page - White Electronic Designs Corporation |
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WV3H2256M72AER665D6SG Datasheet(HTML) 8 Page - White Electronic Designs Corporation |
8 / 12 page WV3HG2256M72AER-D6 ADVANCED 8 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com White Electronic Designs April 2006 Rev. 1 AC TIMING PARAMETERS (Continued) VCC = +1.8V ± 0.1V AC Characteristics 806 665 534 403 Parameter Symbol Min Max Min Max Min Max Min Max Unit DQS read preamble tRPST TBD TBD 0.4 0.6 0.4 0.6 0.4 0.6 tCK DQS write preamble setup time tWPRES TBD TBD 000 ps DQS write preamble tWPRE TBD TBD 0.35 0.35 0.35 tCK DQS write postamble tWPST TBD TBD 0.4 0.6 0.4 0.6 0.4 0.6 tCK Write command to first DQS latching transition tDQSS TBD TBD WL-0.25 WL+0.25 WL-0.25 WL+0.25 WL-0.25 WL+0.25 tCK Address and control input pulse width for each input tIPW TBD TBD 0.6 0.6 0.6 tCK Address and control input setup time tISa TBD TBD 200 250 350 ps Address and control input hold time tIHa TBD TBD 275 375 475 ps CAS# to CAS# command delay tCCD TBD TBD 222 tCK Active to Active (same bank) command tRC TBD TBD 54 55 55 ns Active bank a to Active b bank command tRRD TBD TBD 7.5 7.5 7.5 ns Active to Read or Write delay tRCD TBD TBD 15 15 15 ns Four Bank Activate period tFAW TBD TBD 37.5 37.5 37.5 37.5 37.5 37.5 ns Active to precharge command tRAS TBD TBD 39 70,000 40 70,000 40 70,000 ns Internal Read to precharge command delay tRTP TBD TBD 7.5 7.5 7.5 ns Write recovery time tWR TBD TBD 15 15 15 ns Auto precharge write recovery and precharge time tDAL TBD TBD tWR+tRP tWR+tRP tWR+tRP ns Interval Write to Read command delay tWTR TBD TBD 7.5 7.5 10 ns Precharge command period tRP TBD TBD 15 15 15 ns Precharge All command period tRPA TBD TBD tRP+tCK tRP+tCK tRP+tCK ns Load Mode command cycle time tMRD TBD TBD 222 tCK CKE low to CK,CK# uncertainty tDELAY TBD TBD tIS+tCK + tIH tIS+tCK + tIH tIS+tCK + tIH ns Note: • AC specification is based on SAMSUNG components. Other DRAM manufactures specification may be different. Continued on next page |
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