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W9425G8EH Datasheet(PDF) 2 Page - Winbond |
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W9425G8EH Datasheet(HTML) 2 Page - Winbond |
2 / 53 page W9425G8EH Publication Release Date: Jul. 04, 2008 - 2 - Revision A01 7.10.2 Addressing Mode Select (A3)...............................................................................................15 7.10.3 CAS Latency field (A6 to A4)................................................................................................16 7.10.4 DLL Reset bit (A8)................................................................................................................16 7.10.5 Mode Register /Extended Mode register change bits (BS0, BS1) ........................................16 7.10.6 Extended Mode Register field ..............................................................................................16 7.10.7 Reserved field ......................................................................................................................16 8. OPERATION MODE...................................................................................................................... 17 8.1 Simplified Truth Table.......................................................................................................... 17 8.2 Function Truth Table ........................................................................................................... 18 8.3 Function Truth Table for CKE.............................................................................................. 21 8.4 Simplified Stated Diagram................................................................................................... 22 9. ELECTRICAL CHARACTERISTICS ............................................................................................. 23 9.1 Absolute Maximum Ratings................................................................................................. 23 9.2 Recommended DC Operating Conditions........................................................................... 23 9.3 Capacitance......................................................................................................................... 24 9.4 Leakage and Output Buffer Characteristics ........................................................................ 24 9.5 DC Characteristics............................................................................................................... 25 9.6 AC Characteristics and Operating Condition....................................................................... 26 9.7 AC Test Conditions.............................................................................................................. 27 10. SYSTEM CHARACTERISTICS FOR DDR SDRAM ..................................................................... 30 10.1 Table 1: Input Slew Rate for DQ, DQS, and DM................................................................. 30 10.2 Table 2: Input Setup & Hold Time Derating for Slew Rate.................................................. 30 10.3 Table 3: Input/Output Setup & Hold Time Derating for Slew Rate...................................... 30 10.4 Table 4: Input/Output Setup & Hold Derating for Rise/Fall Delta Slew Rate ...................... 30 10.5 Table 5: Output Slew Rate Characteristics (X8 Devices only)............................................ 30 10.6 Table 6: Output Slew Rate Matching Ratio Characteristics ................................................ 31 10.7 Table 7: AC Overshoot/Undershoot Specification for Address and Control Pins ............... 31 10.8 Table 8: Overshoot/Undershoot Specification for Data, Strobe, and Mask Pins ................ 32 10.9 System Notes: ..................................................................................................................... 33 11. TIMING WAVEFORMS.................................................................................................................. 35 11.1 Command Input Timing ....................................................................................................... 35 11.2 Timing of the CLK Signals................................................................................................... 35 11.3 Read Timing (Burst Length = 4) .......................................................................................... 36 11.4 Write Timing (Burst Length = 4) .......................................................................................... 37 11.5 DM, DATA MASK (W9425G8EH) ....................................................................................... 38 11.6 Mode Register Set (MRS) Timing ....................................................................................... 39 11.7 Extend Mode Register Set (EMRS) Timing......................................................................... 40 |
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