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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 1108 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 yes, no Mil, Ind, Comm See Individual Products Production, NRND
SigmaDDR-II
View 624 products
18Mb, 36Mb, 72Mb, 144Mb x8, x9, x18, x36 Up to 400 2, 4 1.5 n/a 165 BGA yes, no Mil, Ind, Comm See Individual Products Production, NRND
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 yes, no Ind, Comm See Individual Products Production, NRND
Part Number Density Configuration Speed (MHz) Burst Length Read Latency On Die Termination Package 6/6 RoHS Temp Special Features Status
GS81302TT11GE-450 144Mb x9 450 2 2.5 Weak/Strong 165 BGA yes Comm none Production
GS81302TT11GE-400 144Mb x9 400 2 2.5 Weak/Strong 165 BGA yes Comm none Production
GS81302TT11GE-350 144Mb x9 350 2 2.5 Weak/Strong 165 BGA yes Comm none Production
GS81302TT11GE-500I 144Mb x9 500 2 2.5 Weak/Strong 165 BGA yes Ind none Production
GS81302TT11GE-450I 144Mb x9 450 2 2.5 Weak/Strong 165 BGA yes Ind none Production
GS81302TT11GE-400I 144Mb x9 400 2 2.5 Weak/Strong 165 BGA yes Ind none Production
GS81302TT11GE-350I 144Mb x9 350 2 2.5 Weak/Strong 165 BGA yes Ind none Production
GS81302TT20GE-500 144Mb x18 500 2 2.5 Weak/Strong 165 BGA yes Comm none NRND
GS81302TT20GE-450 144Mb x18 450 2 2.5 Weak/Strong 165 BGA yes Comm none NRND
GS81302TT20GE-400 144Mb x18 400 2 2.5 Weak/Strong 165 BGA yes Comm none NRND
GS81302TT20GE-350 144Mb x18 350 2 2.5 Weak/Strong 165 BGA yes Comm none NRND
GS81302TT20GE-500I 144Mb x18 500 2 2.5 Weak/Strong 165 BGA yes Ind none NRND
GS81302TT20GE-450I 144Mb x18 450 2 2.5 Weak/Strong 165 BGA yes Ind none NRND
GS81302TT20GE-400I 144Mb x18 400 2 2.5 Weak/Strong 165 BGA yes Ind none NRND
GS81302TT20GE-350I 144Mb x18 350 2 2.5 Weak/Strong 165 BGA yes Ind none NRND
GS81302TT38GE-500 144Mb x36 500 2 2.5 Weak/Strong 165 BGA yes Comm none NRND
GS81302TT38GE-450 144Mb x36 450 2 2.5 Weak/Strong 165 BGA yes Comm none NRND
GS81302TT38GE-400 144Mb x36 400 2 2.5 Weak/Strong 165 BGA yes Comm none NRND
GS81302TT38GE-350 144Mb x36 350 2 2.5 Weak/Strong 165 BGA yes Comm none NRND
GS81302TT38GE-500I 144Mb x36 500 2 2.5 Weak/Strong 165 BGA yes Ind none NRND
GS81302TT38GE-450I 144Mb x36 450 2 2.5 Weak/Strong 165 BGA yes Ind none NRND
GS81302TT38GE-400I 144Mb x36 400 2 2.5 Weak/Strong 165 BGA yes Ind none NRND
GS81302TT38GE-350I 144Mb x36 350 2 2.5 Weak/Strong 165 BGA yes Ind none NRND
GS81302T06GE-500 144Mb x8 500 2 2.5 Weak/None 165 BGA yes Comm none Production
GS81302T06GE-450 144Mb x8 450 2 2.5 Weak/None 165 BGA yes Comm none Production

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