DDR II SRAM / DDR II+ SRAM
This is a DDR (Double Data Rate) type SRAM that enables data to be read or written twice every clock. This product realizes a much higher transfer rate than conventional synchronous SRAM products. Adoption of BGA package is contributing to the reduction of SRAM mouniing area.
DDR II+ SRAM is SRAM that develops the specification of DDR II SRAM, and improves the performance in addition.
DDR II SRAM / DDR II+ SRAM is ideal for continuous read/write applications such as those used in the look-up tables of network switches and routers.
User's manual / How to Use QDR™ II SRAMs , DDR II SRAMs (439KB)
Product List
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Density
|
Organization
(words x bits)
|
Burst
Length
|
Part Number
(Common I/O)
|
Part Number
(Separate I/O)
|
Remark
(xx = bit)
|
72M
|
8M x 9
4M x 18
2M x 36
|
2
|
|
|
(xx = 09, 18, 36)
|
|
4
|
|
--
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36M
|
4M x 8
4M x 9
2M x 18
1M x 36
|
2
|
|
|
|
4
|
|
--
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18M
|
2M x 8
2M x 9
1M x 18
512K x 36
|
2
|
|
|
(xx = 08, 09, 18, 36)
|
|
4
|
|
--
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|
DDR II+ SRAM
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Density
|
Organization
( word × bit )
|
Burst
Length
|
Read latency
|
Part Number
(Common I/O)
|
Part Number
(Separate I/O)
|
Remark
(xx = bit)
|
72M
|
8M x 9
4M x 18
2M x 36
|
2
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2.0
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-
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(xx = 09, 18, 36)
|
|
2.5
|
|
|
|
Features
- DDR II SRAM,data I/O at 500MHz with an external input clock of 250MHz
- DDR II+ SRAM,data I/O at 900MHz with an external input clock of 450MHz
- PLL circuit is installed
- -Wide data valid window facilitating system design
- Separate I/O type also available
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