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. 170-0738
Mfr. Part No.AS6C4008-55SIN
kr 32,457
Each (In a Tube of 22)
Units
4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 391-731
Mfr. Part No.IS61C1024AL-12JLI
BrandISSI
kr 20,14
Each (In a Pack of 2)
Units
1Mbit 128K words x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount SOJ 32 21.08 x 7.75 x 2.67mm 2.67mm
RS Stock No. 188-5318
Mfr. Part No.CY62128EV30LL-45SXA
kr 26,031
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. 170-2176
Mfr. Part No.IS61C25616AL-10TLI
BrandISSI
kr 37,764
Each (In a Tray of 135)
Units
4Mbit 256k x 16 256k 16bit 10ns 18bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 182-3336
Mfr. Part No.CY7C1021DV33-10BVXI
kr 23,363
Each (In a Pack of 3)
Units
- - - - - - - - - - - - - -
RS Stock No. 145-3848
Mfr. Part No.N01S830BAT22I
kr 17,588
Each (In a Tube of 100)
Units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 4.4 x 3 x 0.9mm 0.9mm
RS Stock No. 181-7594
Mfr. Part No.CY7C1041GN-10ZSXI
kr 43,27
Each (In a Pack of 2)
Units
4Mbit 256K x 16 bit 256K 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 125-7527
Mfr. Part No.CY7C1011DV33-10ZSXI
kr 38,585
Each (In a Pack of 2)
Units
2Mbit 128K x 16 bit 128K 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 178-4005
Mfr. Part No.23K640-I/SN
BrandMicrochip
kr 5,101
Each (In a Tube of 100)
Units
64kbit 8192 words x 8 bit 8K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 538-255
Mfr. Part No.AS7C256A-12TIN
kr 11,17
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. 124-2940
Mfr. Part No.CY62148ELL-45ZSXI
kr 64,11
Each
Units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 391-729
Mfr. Part No.IS62C1024AL-35TLI
BrandISSI
kr 19,84
Each (In a Pack of 2)
Units
1Mbit 128K words x 8 bit 128K 8bit 35ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8.1 x 18.5 x 0.95mm 0.95mm
RS Stock No. 811-5197
Mfr. Part No.IS61WV6416DBLL-10TLI
BrandISSI
kr 16,183
Each (In a Pack of 3)
Units
1Mbit 64k x 16 64k 16bit 10ns 16bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 170-2052
Mfr. Part No.IS61LV5128AL-10TLI
BrandISSI
kr 35,429
Each (In a Tray of 135)
Units
4Mbit 512K words x 8 bit 512K 8bit 10ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 181-7442
Mfr. Part No.CY62148ELL-55SXIT
kr 30,685
Each (On a Reel of 1000)
Units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS Stock No. 178-4035
Mfr. Part No.23K256-I/ST
BrandMicrochip
kr 9,842
Each (In a Tube of 100)
Units
256kbit 32K x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3 x 4.4 x 1mm 1mm
RS Stock No. 170-0749
Mfr. Part No.AS7C256A-12TIN
kr 11,006
Each (In a Tray of 234)
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. 170-2067
Mfr. Part No.IDT70V24L20PFGI
BrandIDT
kr 213,125
Each (In a Tray of 45)
Units
64kbit 4K x 16 bit 4K 16bit 20ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 124-2947
Mfr. Part No.CY62167EV30LL-45BVXI
kr 86,84
Each
Units
16Mbit 1M x 16 bit, 2M x 8 bit 1M, 2M 8 bit, 16 bit 45ns 8 bit, 16 bit 1MHz Yes - Surface Mount VFBGA 48 6 x 8 x 0.79mm 0.79mm
RS Stock No. 798-5208
Mfr. Part No.23LC512-I/SN
BrandMicrochip
kr 13,42
Each (In a Pack of 5)
Units
512kbit 64K x 8 bit 64K 8bit 5ns 8bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
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