Transcend JM800QLU-2G User Manual

 

 

Transcend Information Inc.

 

1

•  Placement 

The JM800QLU-2G is a 256M x 64bits DDR2-800 

Unbuffered DIMM. The JM800QLU-2G consists of 16pcs 

128Mx8bits DDR2 SDRAMs in FBGA packages and a 

2048 bits serial EEPROM on a 240-pin printed circuit 

board. The JM800QLU-2G is a Dual In-Line Memory 

Module and is intended for mounting into 240-pin edge 

connector sockets. 

K

M

A

C

H

J

I

F

B

D

E

G

L

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. 

•  RoHS compliant products. 
•  JEDEC standard 1.8V ± 0.1V Power supply   
•  VDDQ=1.8V ± 0.1V 
•  Max clock Freq: 400MHZ; 800Mb/S/Pin. 
•  Posted CAS   
•  Programmable CAS Latency: 4, 5, 6 
•  Programmable Additive Latency :0, 1, 2, 3, 4, 5 

•  Write Latency (WL) = Read Latency (RL)-1 

•  Burst Length: 4, 8(Interleave/nibble sequential) 

•  Programmable sequential / Interleave Burst Mode 

 

•  Bi-directional Differential Data-Strobe (Single-ended   

 

     

data-strobe is an optional feature)         

•  Off-Chip Driver (OCD) Impedance Adjustment 
•  MRS cycle with address key programs. 
•  On Die Termination 
•  Refresh: Auto Refresh and Self Refresh 

Average Refresh Period: 

     7.8us at lower then T

  85°C 

CASE

•  Serial presence detect with EEPROM