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. 188-5326
Mfr. Part No.CY62157EV30LL-45BVXI
MYR35.688
Each (In a Tray of 480)
units
8Mbit 512k x 16 bit 512k 16bit 45ns - 1MHz Yes - Surface Mount VFBGA 48 8 x 6 x 0.81mm 0.81mm
RS Stock No. 538-198
Mfr. Part No.AS7C34098A-12TIN
MYR22.41
Each
units
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 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. 923-7747
Mfr. Part No.DS1225AB-85+
MYR65.286
Each (In a Tube of 12)
units
64kbit 8K x 8 bit 8K 8bit 70ns 8bit - Yes - Through Hole EDIP 28 39.37 x 18.29 x 10.67mm 10.67mm
RS Stock No. 170-0746
Mfr. Part No.AS7C4096A-12TIN
MYR17.75
Each (In a Tray of 135)
units
4Mbit 512K words x 8 bit 512K 8bit 12ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 714-4841
Mfr. Part No.IDT71321LA25JGI
BrandIDT
MYR65.73
Each
units
16kbit 2K x 8 bit 2K 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 126-6981
Mfr. Part No.RMLV0816BGBG-4S2#AC0
MYR122.48
Each
units
8Mbit 512K words x 16 bit 512K 16bit 45ns 19bit - Yes - Surface Mount FBGA 48 7.58 x 8.58 x 0.8mm 0.8mm
RS Stock No. 125-6972
Mfr. Part No.CY62128ELL-45ZXI
MYR10.76
Each (In a Pack of 5)
units
1Mbit 128K x 16 bit 128K 16bit 45ns 6bit - Yes - Surface Mount TSOP 32 20.751 x 11.43 x 2.895mm 2.895mm
RS Stock No. 125-7526
Mfr. Part No.CY7C1009D-10VXI
MYR12.43
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. 171-0993
Mfr. Part No.CY7C1059DV33-10ZSXI
MYR46.95
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. 714-4738
Mfr. Part No.IDT70V24L20PFGI
BrandIDT
MYR131.40
Each
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. 170-2177
Mfr. Part No.IS61C6416AL-12KLI
BrandISSI
MYR11.328
Each (In a Tray of 16)
units
1Mbit 64k x 16 64k 16bit 12ns 16bit - - - Surface Mount SOJ 44 28.7 x 10.29 x 3.11mm 3.11mm
RS Stock No. 923-7756
Mfr. Part No.DS1245AB-100+
MYR112.39
Each (In a Tube of 11)
units
1024kbit 128K x 8 bit 128K 8bit 70ns 8bit - Yes - Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 10.92mm
RS Stock No. 125-7517
Mfr. Part No.CY62167EV30LL-45ZXI
MYR71.66
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. 181-7597
Mfr. Part No.CY62148EV30LL-45ZSXI
MYR18.24
Each (In a Pack of 2)
units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 146-3205
Mfr. Part No.47C04-I/P
BrandMicrochip
MYR3.558
Each (In a Tube of 60)
units
4kbit 512K x 8 - 8bit - - 1000kHz Yes Synchronous Through Hole DIP 8 10.2 x 7.1 x 4.83mm 4.83mm
New
RS Stock No. 198-8003
Mfr. Part No.CY7C1021D-10ZSXIT
MYR11.163
Each (On a Reel of 1000)
units
1024kbit 64K x 16 65536 16bit 10ns - - - - - - - - -
RS Stock No. 182-3290
Mfr. Part No.CY7C1041G-10VXI
MYR28.888
Each (In a Tube of 17)
units
4Mbit 256K x 16 bit 256K 16bit 10ns - 100MHz - Asynchronous Surface Mount SOJ 44 1.13 x 0.405 x 0.11in 2.79mm
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. 188-5337
Mfr. Part No.CY7C1051DV33-10ZSXI
MYR54.943
Each (In a Tray of 135)
units
8Mbit 512k x 16 bit 512k 16bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
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