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. 188-5317
Mfr. Part No.CY62128ELL-45SXI
kr 23,932
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. 125-7519
Mfr. Part No.CY62187EV30LL-55BAXI
kr 691,32
Each
Units
64Mbit 4M x 16 bit 4M 16bit 55ns 16bit - Yes - Surface Mount VFBGA 48 8 x 9.5 x 1.2mm 1.2mm
RS Stock No. 811-5169
Mfr. Part No.IS61C5128AS-25QLI
BrandISSI
kr 41,225
Each (In a Pack of 2)
Units
4Mbit 512k x 8 512k 8bit 25ns 19bit - Yes - Surface Mount SOP 32 20.75 x 11.43 x 2.75mm 2.75mm
RS Stock No. 797-5881
Mfr. Part No.AS7C38098A-10TIN
kr 129,21
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. 538-259
Mfr. Part No.AS7C34096A-12JIN
kr 45,36
Each
Units
4Mbit 512K words x 8 bit 512K 8bit 12ns 19bit - Yes Asynchronous Surface Mount SOJ 36 23.62 x 10.16 x 2.95mm 2.95mm
RS Stock No. 811-5185
Mfr. Part No.IS61WV25616EDBLL-10TLI
BrandISSI
kr 26,945
Each (In a Pack of 2)
Units
4Mbit 256k x 16 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 811-5172
Mfr. Part No.IS61C6416AL-12TLI
BrandISSI
kr 19,84
Each (In a Pack of 3)
Units
1Mbit 64k x 16 64k 16bit 12ns 16bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 178-4111
Mfr. Part No.23K256-E/SN
BrandMicrochip
kr 10,05
Each (In a Tube of 100)
Units
256kbit 32768 x 8 bit 32768 8bit 50ns 16bit 20MHz - Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 171-0993
Mfr. Part No.CY7C1059DV33-10ZSXI
kr 101,672
Each (In a Tray of 135)
Units
8Mbit 1M x 8 bit 1M 8bit 10ns 8bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 797-5869
Mfr. Part No.AS7C316096A-10TIN
kr 143,89
Each
Units
16Mbit 2048K x 8 bit 2048K 8bit 10ns 8bit 1MHz Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS Stock No. 538-261
Mfr. Part No.AS7C3256A-12TIN
kr 17,545
Each (In a Pack of 2)
Units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8 x 11.8 x 1.05mm 1.05mm
RS Stock No. 901-5828
Mfr. Part No.R1LP0408DSP-5SI#B0
kr 126,17
Each
Units
4000kbit 512K x 8 bit 512K 8bit 55ns - - Yes Asynchronous Surface Mount SOP 32 20.95 x 11.5 x 2.75mm 2.75mm
RS Stock No. 125-7526
Mfr. Part No.CY7C1009D-10VXI
kr 27,02
Each (In a Pack of 2)
Units
1Mbit 128K x 8 bit 128K 8bit 10ns - - Yes - Surface Mount SOJ 32 21.08 x 7.75 x 2.92mm 2.92mm
RS Stock No. 797-9467
Mfr. Part No.DS1345YP-100+
kr 135,41
Each
Units
1024kbit 128K x 8 bit 128K 8bit 70ns 8bit - - - Surface Mount Power Cap 34 0.995 x 0.93 x 0.032in 0.81mm
RS Stock No. 767-5963
Mfr. Part No.R1WV6416RBG-7SI#B0
kr 294,08
Each
Units
64Mbit 4M words x 16 bit 4M 16bit 70ns - - Yes Asynchronous Surface Mount FBGA 48 8.5 x 11 x 0.8mm 0.8mm
RS Stock No. 901-5843
Mfr. Part No.RMLV0414EGSB-4S2#AA0
kr 123,13
Each
Units
4Mbit 256K x 16 bit 256K 16bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1mm 1mm
New
RS Stock No. 193-8462
Mfr. Part No.CY7C1021D-10VXIT
kr 26,291
Each (On a Reel of 500)
Units
1Mbit 64 k x 16 bit 64 k 16bit 10ns 16bit 1MHz - Asynchronous Through Hole SOJ 85 1.12 x 0.395 x 0.095in 2.41mm
RS Stock No. 126-6984
Mfr. Part No.RMLV0816BGSD-4S2#AC0
kr 150,25
Each
Units
8Mbit 512K words x 16 bit, 1024K words x 8 bit 512K, 1024K 8 bit, 16 bit 45ns 18 bit, 19 bit - Yes - Surface Mount TSOP 52 10.89 x 8.99 x 1mm 1mm
RS Stock No. 124-2949
Mfr. Part No.CY7C1021D-10ZSXI
kr 16,00
Each (In a Pack of 2)
Units
1Mbit 64K x 16 bit 64K 16bit 10ns 16bit 100MHz Yes Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 126-6976
Mfr. Part No.RMLV0408EGSB-4S2#AA1
kr 104,08
Each
Units
4Mbit 512K words x 8 bit 512K 8bit 45ns 19bit - Yes - Surface Mount TSOP 32 11.9 x 8.1 x 1mm 1mm