Beginning of this page
Jump to main content

Please note that JavaScript and style sheet are used in this website,
Due to unadaptability of the style sheet with the browser used in your computer, pages may not look as original.
Even in such a case, however, the contents can be used safely.

The following page content corresponds to the products formerly marketed by NEC Electronics

Products > Memory > Former NEC Electronics Memory > QDR SRAM / DDR SRAM >

QDR™ II SRAM / QDR™ II+ SRAM


QDR is an SRAM that is equipped with a data input pin and a data output pin separately, while a standard SRAM has a common pin for data input and output. QDR runs data input and output at double data rate (DDR), enabling ultra-high-speed operation through simultaneous data reading and writing. It gives the highest performance when reading and writing data alternately.
QDR II+ SRAM is SRAM that develops the specification of QDR II SRAM, and improves the performance in addition.
This memory is ideal for use in next-generation high-performance network switches, routers, etc.

pdf User's manual / How to Use QDR™ II SRAMs , DDR II SRAMs (439KB)


Product List

QDR II SRAM


Density Organization
(words x bits) 		Burst
Length 		Part Number Remark
(xx = bit)
72M
Details 		8M x 9
4M x 18
2M x 36 		2 (xx = 09, 18, 36)
4
36M
Details 		4M x 8
4M x 9
2M x 18
1M x 36 		2 (xx = 08, 09, 18, 36)
4
18M
Details 		2M x 8
2M x 9
1M x 18
512K x 36 		2
4

QDR II+ SRAM


Density Organization
( word × bit ) 		Burst
Length 		Read latency Part Number Remark
(xx = bit)
72M
Details 		8M x 9
4M x 18
2M x 36 		4 2.0 (xx = 09, 18, 36)
2.5



Features

  • High-speed data transfer is achieved.
    • -QDR II SRAM,data transfer rate of up to 36Gbps (250MHz, 36 I/O)
    • -QDR II+ SRAM,data transfer rate of up to 64.8Gbps (450MHz, 36 I/O)
  • PLL circuit is installed.
    • -Wide data valid period facilitating system design.

QDR

Inquiry Concerning Memory