NT5DS64M4AT-75B中文資料etc未分類制造商數(shù)據(jù)手冊PDF規(guī)格書

[Nanya]

Description

The 256Mb DDR SDRAM is a high-speed CMOS, dynamic random-access memory containing 268,435,456 bits. It is internally configured as a quad-bank DRAM.

Features

? Double data rate architecture: two data transfers per clock cycle

? Bidirectional data strobe (DQS) is transmitted and received with data, to be used in capturing data at the receiver

? DQS is edge-aligned with data for reads and is centeraligned with data for writes

? Differential clock inputs (CK and CK)

? Four internal banks for concurrent operation

? Data mask (DM) for write data

? DLL aligns DQ and DQS transitions with CK transitions

? Commands entered on each positive CK edge; data and data mask referenced to both edges of DQS

? Burst lengths: 2, 4, or 8

? CAS Latency: 2, 2.5

? Auto Precharge option for each burst access

? Auto Refresh and Self Refresh Modes

? 7.8ms Maximum Average Periodic Refresh Interval

? 2.5V (SSTL_2 compatible) I/O

? VDDQ = 2.5V ± 0.2V

? VDD = 2.5V ± 0.2V

? -7K parts support PC2100 modules.

-75B parts support PC2100 modules

-8B parts support PC1600 modules