Double Data Rate (DDR) SDRAM
256Mb: x4, x8, x16 DDR SDRAM Features
Double Data Rate (DDR) SDRAM
MT46V64M4 – 16 Meg x 4 x 4 banks MT46V32M8 – 8 Meg x ...
Description
256Mb: x4, x8, x16 DDR SDRAM Features
Double Data Rate (DDR) SDRAM
MT46V64M4 – 16 Meg x 4 x 4 banks MT46V32M8 – 8 Meg x 8 x 4 banks MT46V16M16 – 4 Meg x 16 x 4 banks
Features
VDD VDD
= =
2.5V 2.6V
±0.2V; ±0.1V;
VDDQ VDDQ
= =
2.5V 2.6V
±0.2V ±0.1V
(DDR400)1
Bidirectional data strobe (DQS) transmitted/
received with data, that is, source-synchronous data
capture (x16 has two – one per byte)
Internal, pipelined double data rate (DDR)
architecture; two data accesses per clock cycle
Differential clock inputs (CK and CK#)
Commands entered on each positive CK edge
DQS edge-aligned with data for READs; center-
aligned with data for WRITEs
DLL to align DQ and DQS transitions with CK
Four internal banks for concurrent operation
Data mask (DM) for masking write data
(x16 has two – one per byte)
Programmable burst lengths (BL): 2, 4, or 8
Auto refresh
– 64ms, 8192-cycle
Longer-lead TSOP for improved reliabi...
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