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W942504CH
16M
× 4 BANKS × 4 BIT DDR SDRAM
Publication Release Date: February 14, 2003
- 1 -
Revision A1
Table of Contents-
1. GENERAL DESCRIPTION.................................................................................................................. 3
2. FEATURES ......................................................................................................................................... 3
3. KEY PARAMETERS............................................................................................................................ 3
4. PIN CONFIGURATION ....................................................................................................................... 4
5. PIN DESCRIPTION............................................................................................................................. 5
6. BLOCK DAIAGRAM ............................................................................................................................ 6
7. ELECTRICAL CHARACTERISTICS ...................................................................................................7
Absolute Maximum Ratings ..................................................................................................................... 7
Recommended DC Operating Conditions ............................................................................................... 7
Capacitance............................................................................................................................................. 8
Leakage and Output Buffer Characteristics............................................................................................. 8
DC Characteristics................................................................................................................................... 9
AC Characteristics and Operating Condition ......................................................................................... 10
AC Test Conditions................................................................................................................................ 11
8. OPERATION MODE.......................................................................................................................... 13
Simplified Truth Table............................................................................................................................ 13
Function Truth Table.............................................................................................................................. 14
Function Truth Table for CKE ................................................................................................................ 17
Simplified State Diagram ....................................................................................................................... 18
9. FUNCTIONAL DESCRIPTION.......................................................................................................... 19
Power Up Sequence.............................................................................................................................. 19
Command Function ............................................................................................................................... 19
Read Operation ..................................................................................................................................... 22
Write Operation...................................................................................................................................... 22
Precharge .............................................................................................................................................. 22
Burst Termination .................................................................................................................................. 22
Refresh Operation ................................................................................................................................. 23
Power Down Mode ................................................................................................................................ 23
Mode Register Operation....................................................................................................................... 23
10. TIMING WAVEFORMS ................................................................................................................... 27
Command Input Timing ......................................................................................................................... 27
Timing of the CLK Signals ..................................................................................................................... 27
Read Timing (Burst Length = 4)............................................................................................................. 28