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DDR SRAMs

GSI's SigmaDDR SRAMs are the acknowledged leader in the industry with their combination of capacity and performance. SigmaDDR transaction rates are unequaled by any competitors.


SigmaDDR SRAMs are synchronous memories with a common read and write data bus. "DDR" refers to their ability to transfer 2 beats of data on the data bus in a single clock cycle. SigmaDDR memories are ideal for applications that alternate between read and write operations infrequently, at operating speeds of 250 MHz and above.


GSI's SigmaDDR devices are compatible with all competitor Double Data Rate SRAMs.

 

Features

  • SigmaDDR Interface
  • Dual Double Data Rate Interface
  • Pipelined Read operation 
  • Fully coherent Read and Write pipelines
  • ZQ mode pin for programmable output drive strength
  • IEEE 1149.1 JTAG-compliant Boundary Scan
  • JEDEC-standard pinout and package
  • RoHS-compliant package available 


Name Density Config. Speed (MHz) Burst Length Read Latency (RL) On-Die Termination Package 6/6 RoHS Temp Special Features Status
SigmaDDR-IIIe
View 89 products
72Mb, 144Mb, 288Mb x18, x36 Up to 833 2 2, 3 Weak/Strong/None 260 BGA yes, no Mil, Ind, Comm See Individual Products Production, Active, NRND
SigmaDDR-II+
View 1104 products
18Mb, 36Mb, 72Mb, 144Mb, 288Mb x8, x9, x18, x36 Up to 633 2 2, 2.5 n/a, Weak/Strong, Weak/None 165 BGA no, yes Ind, Comm See Individual Products NRND, Production
SigmaDDR-II
View 620 products
18Mb, 36Mb, 72Mb, 144Mb x8, x9, x18, x36 Up to 400 2, 4 1.5 n/a 165 BGA no, yes Mil, Ind, Comm See Individual Products NRND, Production
SigmaSIO DDR-II
View 380 products
18Mb, 36Mb, 72Mb, 144Mb, 288Mb x8, x9, x18, x36 Up to 400 2 1.5 n/a 165 BGA no, yes Ind, Comm See Individual Products NRND, Production
Part Number Density Configuration Speed (MHz) Burst Length Read Latency On Die Termination Package 6/6 RoHS Temp Special Features Status
GS81302T20E-450I 144Mb x18 450 2 2.5 Weak/None 165 BGA no Ind none NRND
GS81302T20E-400I 144Mb x18 400 2 2.5 Weak/None 165 BGA no Ind none NRND
GS81302T20E-350I 144Mb x18 350 2 2.5 Weak/None 165 BGA no Ind none NRND
GS81302T38E-500 144Mb x36 500 2 2.5 Weak/None 165 BGA no Comm none NRND
GS81302T38E-450 144Mb x36 450 2 2.5 Weak/None 165 BGA no Comm none NRND
GS81302T38E-400 144Mb x36 400 2 2.5 Weak/None 165 BGA no Comm none NRND
GS81302T38E-350 144Mb x36 350 2 2.5 Weak/None 165 BGA no Comm none NRND
GS81302T38E-500I 144Mb x36 500 2 2.5 Weak/None 165 BGA no Ind none NRND
GS81302T38E-450I 144Mb x36 450 2 2.5 Weak/None 165 BGA no Ind none NRND
GS81302T38E-400I 144Mb x36 400 2 2.5 Weak/None 165 BGA no Ind none NRND
GS81302T38E-350I 144Mb x36 350 2 2.5 Weak/None 165 BGA no Ind none NRND
GS81302TT07E-450 144Mb x8 450 2 2 Weak/Strong 165 BGA no Comm none NRND
GS81302TT07E-400 144Mb x8 400 2 2 Weak/Strong 165 BGA no Comm none NRND
GS81302TT07E-350 144Mb x8 350 2 2 Weak/Strong 165 BGA no Comm none NRND
GS81302TT07E-333 144Mb x8 333 2 2 Weak/Strong 165 BGA no Comm none NRND
GS81302TT07E-300 144Mb x8 300 2 2 Weak/Strong 165 BGA no Comm none NRND
GS81302TT07E-450I 144Mb x8 450 2 2 Weak/Strong 165 BGA no Ind none NRND
GS81302TT07E-400I 144Mb x8 400 2 2 Weak/Strong 165 BGA no Ind none NRND
GS81302TT07E-350I 144Mb x8 350 2 2 Weak/Strong 165 BGA no Ind none NRND
GS81302TT07E-333I 144Mb x8 333 2 2 Weak/Strong 165 BGA no Ind none NRND
GS81302TT07E-300I 144Mb x8 300 2 2 Weak/Strong 165 BGA no Ind none NRND
GS81302TT10E-450 144Mb x9 450 2 2 Weak/Strong 165 BGA no Comm none NRND
GS81302TT10E-400 144Mb x9 400 2 2 Weak/Strong 165 BGA no Comm none NRND
GS81302TT10E-350 144Mb x9 350 2 2 Weak/Strong 165 BGA no Comm none NRND
GS81302TT10E-333 144Mb x9 333 2 2 Weak/Strong 165 BGA no Comm none NRND