SRAM

SRAM stands for Static Random Access Memory and is a type of semiconductor memory that uses bistable latching circuitry (flip-flop) to store each bit. It holds data bits in its memory so long as power is being supplied. It cannot hold data if power is removed. SRAM is used where speed or low power are needed. Its higher density than DRAM, and less complicated structure makes it ideal to use in semiconductor memory scenarios where high capacity memory is used as seen in the working memory within computers.SRAM is different to DRAM (dynamic RAM, which stores bits in cells consisting of a capacitor and a transistor), due to the fact that SRAM does not have to be refreshed unlike Dynamic which will lose data unless refreshed periodically. Also SRAM is faster and more expensive than DRAM.SRAM is used for a computers cache memory as well as being part of the RAM digital to analogue converter found on a video card. SRAM can be designed with a general CMOS technology process with six transistors (6T memory cell) and no capacitors. Since transistors do not require power to prevent leakage, SRAM does not have to be refreshed on a regular basis:Features include: Data is held statically – data is held in the semiconductor memory, no need to refresh data after every read data operation as long as the power is applied to the memory Three operational states which are hold, write and read Bistable (cross-coupled) INVs for storage Access transistors MAL and MAR – access to stored data for read and write Word line, WL, controls access – WL=0 (hold operation), WL=1 (read/write operation) Long data lifetime Simplicity Faster – quick and easy to control Used as cache memory Large size Price – expensive as it uses more chips than DRAM for the same amount of storage space High power Consumption ReliabilityDisadvantages include: Capacity Varying power consumptionCan be found in the following: Computers Workstations Routers LCD screens and printers Electronics Microprocessor

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Description Price Memory Size Organisation Number of Words Number of Bits per Word Maximum Random Access Time Address Bus Width Clock Frequency Low Power Timing Type Mounting Type Package Type Pin Count Dimensions Height
RS Stock No. 125-6971
Mfr. Part No.CY62128ELL-45SXI
MYR12.47
Each (In a Pack of 2)
units
1Mbit 128K x 16 bit 128K 16bit 45ns 8bit - Yes - Surface Mount SOIC 32 20.751 x 11.43 x 2.895mm 2.895mm
RS Stock No. 188-5317
Mfr. Part No.CY62128ELL-45SXI
MYR11.04
Each (In a Tube of 25)
units
1Mbit 128k x 8 bit 128k 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.88mm 2.88mm
RS Stock No. 188-5336
Mfr. Part No.CY7C1021DV33-10ZSXI
MYR18.755
Each (In a Tray of 135)
units
1Mbit 128k x 8 bit 128k 8bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 797-5881
Mfr. Part No.AS7C38098A-10TIN
MYR57.93
Each
units
8Mbit 512K x 16 bit 512K 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 44 18.618 x 10.363 x 1.05mm 1.05mm
RS Stock No. 125-6979
Mfr. Part No.CY62138FV30LL-45ZAXI
MYR17.83
Each (In a Pack of 2)
units
2Mbit 256K x 8 bit 256K 8bit 45ns 8bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 125-6981
Mfr. Part No.CY62148EV30LL-45BVXI
MYR24.38
Each
units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount VFBGA 36 6 x 8 x 0.84mm 0.84mm
RS Stock No. 181-8242
Mfr. Part No.CY62128ELL-45SXIT
MYR8.96
Each (On a Reel of 1000)
units
1Mbit 128K x 8 bit 128K 8bit 45ns 8bit - Yes Asynchronous Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS Stock No. 171-0963
Mfr. Part No.CY14B108N-ZSP45XI
MYR158.163
Each (In a Tray of 108)
units
8Mbit 512K x 16 bit 512K 16bit 45ns 16bit - Yes Asynchronous Surface Mount TSOP 54 22.517 x 10.262 x 1.05mm 1.05mm
New
RS Stock No. 193-8468
Mfr. Part No.CY7C1049G30-10VXI
MYR33.50
Each (In a Pack of 2)
units
4Mbit 512 k x 8 bit 512 k 8bit 10ns 8bit 100MHz - Asynchronous Through Hole SOJ 36 0.92 x 0.395 x 0.103in 2.62mm
RS Stock No. 577-705
Mfr. Part No.R1LP0408CSC-5SC#BT
MYR68.89
Each
units
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 - -
RS Stock No. 181-7441
Mfr. Part No.CY62147EV30LL-45ZSXI
MYR11.82
Each (In a Tray of 135)
units
4Mbit 256K x 16 bit 256K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 170-2059
Mfr. Part No.IS61LV6416-10TL
BrandISSI
MYR10.235
Each (In a Tray of 135)
units
1Mbit 64K words x 16 bit 64K 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
New
RS Stock No. 193-8458
Mfr. Part No.CY62256NLL-55ZXIT
MYR5.701
Each (On a Reel of 1500)
units
256kbit 32 k x 8 bit 32 k 8bit 55ns 8bit 1MHz Yes Asynchronous Surface Mount TSOP I 28 11.9 x 8.1 x 1mm 1mm
RS Stock No. 126-6966
Mfr. Part No.R1LV0108ESA-5SI#B1
MYR30.50
Each
units
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes - Surface Mount sTSOP 32 11.9 x 8.1 x 1mm 1mm
New
RS Stock No. 193-8457
Mfr. Part No.CY621472E30LL-45ZSXI
MYR31.95
Each (In a Pack of 2)
units
4Mbit 256 k x 16 bit 256 k 16bit 45ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP II 44 18.517 x 10.262 x 1.044mm 1.04mm
RS Stock No. 538-158
Mfr. Part No.AS6C6264-55PCN
MYR10.66
Each (In a Pack of 2)
units
64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 171-0979
Mfr. Part No.CY62157EV30LL-55ZSXE
MYR41.80
Each (In a Tray of 135)
units
8Mbit 512K x 16 bit 512K 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 125-7528
Mfr. Part No.CY7C1019D-10ZSXI
MYR19.35
Each (In a Pack of 2)
units
1Mbit 128K x 8 bit 128K 8bit 10ns 8bit - Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 901-5723
Mfr. Part No.R1LV1616RBG-5SI#B0
MYR150.99
Each
units
16Mbit 1M x 16 bit 1M 16bit 55ns - - Yes Asynchronous Surface Mount FBGA 48 7.5 x 8.5 x 0.8mm 0.8mm
RS Stock No. 170-2043
Mfr. Part No.IS62WV25616BLL-55TLI
BrandISSI
MYR20.648
Each (In a Tray of 135)
units
4Mbit 256K words x 16 bit 256K 16bit 55ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
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