Transcend 256MB, Jetram, DDR, DIMM,400MHz, CL2 JM334D643A-50 User Manual

 

 

Transcend Information Inc.

 

1

The JM334D643A-50 is a 32M x 64bits Double Data Rate 

SDRAM high-density for DDR400.The JM334D643A-50 

consists of 8pcs CMOS 32Mx8 bits Double Data Rate 

SDRAMs in 66 pin TSOP-II 400mil packages and a 2048 

bits serial EEPROM on a 184-pin printed circuit board. 

The JM334D643A-50 is a Dual In-Line Memory Module 

and is intended for mounting into 184-pin edge connector 

sockets. 

A

B

D

C

I

G

F

E

H

Synchronous design allows precise cycle control with the 

use of system clock. Data I/O transactions are possible 

on both edges of DQS. Range of operation frequencies, 

programmable latencies allow the same device to be 

useful for a variety of high bandwidth, high performance 

memory system applications. 

•  Power supply: VDD: 2.6V ± 0.1V, VDDQ: 2.6V ± 0.1V 
•  Max clock Freq: 200MHZ. 
•  Double-data-rate architecture; two data transfers per   

clock cycle 

•  Differential clock inputs (CK and /CK) 
•  DLL aligns DQ and DQS transition with CK transition 
•  Auto and Self Refresh 7.8us refresh interval. 
•  Data I/O transactions on both edge of data strobe. 
•  Edge aligned data output, center aligned data 

•  Serial Presence Detect (SPD) with serial EEPROM   

•  SSTL-2 compatible inputs and outputs. 

•  MRS cycle with address key programs. 

        CAS Latency (Access from column address): 2.5 

    Burst Length (2,4,8) 

    Data Sequence (Sequential & Interleave)