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W9425G8EH Datasheet Preview

W9425G8EH Datasheet

8M X 4 BANKS X 8 BITS DDR SDRAM

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www.DataSheet.co.kr
W9425G8EH
8M × 4 BANKS × 8 BITS DDR SDRAM
Table of Contents-
1. GENERAL DESCRIPTION .............................................................................................................. 4
2. FEATURES...................................................................................................................................... 4
3. KEY PARAMETERS........................................................................................................................ 5
4. PIN CONFIGURATION.................................................................................................................... 6
5. PIN DESCRIPTION ......................................................................................................................... 7
6. BLOCK DIAGRAM........................................................................................................................... 8
7. FUNCTIONAL DESCRIPTION ........................................................................................................ 9
7.1 Power Up Sequence.............................................................................................................. 9
7.2 Command Function ............................................................................................................. 10
7.2.1 Bank Activate Command ......................................................................................................10
7.2.2 Bank Precharge Command ..................................................................................................10
7.2.3 Precharge All Command ......................................................................................................10
7.2.4 Write Command ...................................................................................................................10
7.2.5 Write with Auto-precharge Command ..................................................................................10
7.2.6 Read Command ...................................................................................................................10
7.2.7 Read with Auto-precharge Command ..................................................................................10
7.2.8 Mode Register Set Command ..............................................................................................11
7.2.9 Extended Mode Register Set Command ..............................................................................11
7.2.10 No-Operation Command ......................................................................................................11
7.2.11 Burst Read Stop Command..................................................................................................11
7.2.12 Device Deselect Command ..................................................................................................11
7.2.13 Auto Refresh Command .......................................................................................................11
7.2.14 Self Refresh Entry Command...............................................................................................12
7.2.15 Self Refresh Exit Command .................................................................................................12
7.2.16 Data Write Enable /Disable Command .................................................................................12
7.3 Read Operation ................................................................................................................... 12
7.4 Write Operation ................................................................................................................... 13
7.5 Precharge ............................................................................................................................ 13
7.6 Burst Termination ................................................................................................................ 13
7.7 Refresh Operation ............................................................................................................... 13
7.8 Power Down Mode .............................................................................................................. 14
7.9 Input Clock Frequency Change during Precharge Power Down Mode .............................. 14
7.10 Mode Register Operation .................................................................................................... 14
7.10.1 Burst Length field (A2 to A0) ................................................................................................14
Publication Release Date: Jul. 04, 2008
- 1 - Revision A01
Datasheet pdf - http://www.DataSheet4U.net/




Winbond

W9425G8EH Datasheet Preview

W9425G8EH Datasheet

8M X 4 BANKS X 8 BITS DDR SDRAM

No Preview Available !

www.DataSheet.co.kr
W9425G8EH
7.10.2
7.10.3
7.10.4
7.10.5
Addressing Mode Select (A3)...............................................................................................15
CAS Latency field (A6 to A4)................................................................................................16
DLL Reset bit (A8) ................................................................................................................16
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
Publication Release Date: Jul. 04, 2008
- 2 - Revision A01
Datasheet pdf - http://www.DataSheet4U.net/


Part Number W9425G8EH
Description 8M X 4 BANKS X 8 BITS DDR SDRAM
Maker Winbond
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