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W942508BH

8M

脳

4 BANKS

脳

8 BIT DDR SDRAM

Table of Contents-

1. GENERAL DESCRIPTION ..................................................................................................................3

2. FEATURES ..........................................................................................................................................3

3. KEY PARAMETERS ............................................................................................................................3

4. PIN CONFIGURATION........................................................................................................................4

5. PIN DESCRIPTION .............................................................................................................................5

6. BLOCK DIAGRAM ...............................................................................................................................6

7. ABSOLUTE MAXIMUM RATINGS ......................................................................................................7

8. RECOMMENDED DC OPERATING CONDITIONS............................................................................7

9. CAPACITANCE ...................................................................................................................................8

10. LEAKAGE AND OUTPUT BUFFER CHARACTERISTICS ...............................................................8

11. DC CHARACTERISTICS...................................................................................................................9

12. AC CHARACTERISTICS AND OPERATING CONDITION.............................................................10

13. AC TEST CONDITIONS ..................................................................................................................11

14. OPERATION MODE ........................................................................................................................13

Simplified Truth Table............................................................................................................................ 13

Function Truth Table ............................................................................................................................. 14

Function Truth Table for CKE................................................................................................................ 17

15. SIMPLIFIED STATE DIAGRAM ......................................................................................................18

16. FUNCTIONAL DESCRIPTION ........................................................................................................19

Power Up Sequence.............................................................................................................................. 19

Command Function ............................................................................................................................... 19

Read Operation ..................................................................................................................................... 22

Write Operation ..................................................................................................................................... 22

Precharge .............................................................................................................................................. 22

Burst Termination .................................................................................................................................. 23

Refresh Operation ................................................................................................................................. 23

Power Down Mode ................................................................................................................................ 23

Mode Register Operation ...................................................................................................................... 23

17. TIMING WAVEFORMS....................................................................................................................27

Command Input Timing ......................................................................................................................... 27

Timing of the CLK Signals ..................................................................................................................... 27

Read Timing (Burst Length = 4) ............................................................................................................ 28

-1-

Publication Release Date: March 19, 2002

Revision A1

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