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. 170-0736
Mfr. Part No.AS6C62256-55PCN
kr 18,704
Each (In a Tube of 15)
Units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 188-5328
Mfr. Part No.CY62158ELL-45ZSXI
kr 90,439
Each (In a Tray of 135)
Units
8Mbit 512k x 16 bit 512k 16bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 538-148
Mfr. Part No.AS6C62256-55PCN
kr 20,835
Each (In a Pack of 2)
Units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 124-2945
Mfr. Part No.CY62158ELL-45ZSXI
kr 101,79
Each
Units
8Mbit 1M x 8 bit 1M 8bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 744-4542
Mfr. Part No.AS6C1008-55PCN
kr 23,93
Each
Units
1Mbit 128K x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 171-0983
Mfr. Part No.CY62167EV30LL-45ZXI
kr 123,539
Each (In a Tray of 192)
Units
16Mbit 1M x 16 bit 1M 16bit 45ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 125-7517
Mfr. Part No.CY62167EV30LL-45ZXI
kr 153,74
Each
Units
16Mbit 1M x 16 bit 1M 16bit 45ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 125-6971
Mfr. Part No.CY62128ELL-45SXI
kr 26,87
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. 170-0891
Mfr. Part No.AS6C1008-55PCN
kr 21,389
Each (In a Tube of 13)
Units
1Mbit 128K x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 170-0735
Mfr. Part No.AS6C62256-55SIN
kr 15,533
Each (In a Tube of 25)
Units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 811-5166
Mfr. Part No.IS61C256AL-12JLI-TR
BrandISSI
kr 10,32
Each (In a Pack of 4)
Units
256kbit 32k x 8 32k 8bit 12ns 15bit - Yes - Surface Mount SOJ 28 18.54 x 7.75 x 2.67mm 2.67mm
RS Stock No. 125-7519
Mfr. Part No.CY62187EV30LL-55BAXI
kr 684,34
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. 714-4826
Mfr. Part No.IDT7132LA35PDG
BrandIDT
kr 118,84
Each
Units
16kbit 2K x 8 bit 2K 8bit 35ns 8bit - Yes Asynchronous Through Hole PDIP 48 61.7 x 15.24 x 3.8mm 3.8mm
RS Stock No. 391-719
Mfr. Part No.IS61C256AL-12JLI
BrandISSI
kr 9,745
Each (In a Pack of 4)
Units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount SOJ 28 18.54 x 7.75 x 2.67mm 2.67mm
RS Stock No. 912-2859
Mfr. Part No.23LC1024-I/ST
BrandMicrochip
kr 17,695
Each (In a Tube of 100)
Units
1Mbit 128K words x 8 bit 128K 8bit - 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 170-2075
Mfr. Part No.IDT7132LA35PDG
BrandIDT
kr 108,117
Each (In a Tube of 7)
Units
16kbit 2K x 8 bit 2K 8bit 35ns 8bit - Yes Asynchronous Through Hole PDIP 48 61.7 x 15.24 x 3.8mm 3.8mm
RS Stock No. 823-4532
Mfr. Part No.23LC512-I/ST
BrandMicrochip
kr 13,878
Each (In a Pack of 5)
Units
512kbit 64k x 8 bit 64K 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 188-5317
Mfr. Part No.CY62128ELL-45SXI
kr 23,689
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. 769-7349
Mfr. Part No.23LC1024-I/ST
BrandMicrochip
kr 19,74
Each (In a Pack of 2)
Units
1Mbit 128K words x 8 bit 128Kk 8bit - 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 178-4114
Mfr. Part No.23LC512-I/ST
BrandMicrochip
kr 12,722
Each (In a Tube of 100)
Units
512kbit 64k x 8 bit 64K 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
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