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. 124-2938
Mfr. Part No.CY62136EV30LL-45ZSXI
MYR15.17
Each (In a Pack of 2)
units
2Mbit 128K x 16 bit 128K 16bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 538-211
Mfr. Part No.AS7C4096A-12JIN
MYR22.41
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
New
RS Stock No. 193-8456
Mfr. Part No.CY621472E30LL-45ZSXI
MYR28.14
Each (In a Tray of 135)
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. 125-7538
Mfr. Part No.CY7C1350G-133AXC
MYR29.33
Each
units
4Mbit 128K x 36 bit 128K 36bit - - - Yes - Surface Mount TQFP 100 14.1 x 20.1 x 1.45mm 1.45mm
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. 189-7468
Mfr. Part No.DS1245Y-100+
MYR168.964
Each (In a Tube of 11)
units
1Mbit 128K x 8 bit 128K 8bit 100ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 188-5330
Mfr. Part No.CY62167EV30LL-45BVXI
MYR35.876
Each (In a Tray of 480)
units
16Mbit 2M x 8 bit 2M 8bit 45ns 16bit 1MHz Yes - Surface Mount VFBGA 48 8 x 6 x 0.55mm 0.55mm
New
RS Stock No. 193-8455
Mfr. Part No.CY62146ELL-45ZSXI
MYR49.54
Each
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. 146-8951
Mfr. Part No.47L04-I/ST
BrandMicrochip
MYR2.74
Each (In a Pack of 10)
units
4kbit 512K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 182-3386
Mfr. Part No.CY7C1049GN-10VXI
MYR25.20
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 146-0606
Mfr. Part No.AS7C38096A-10TIN
MYR63.697
Each (In a Tray of 135)
units
8Mbit 1M x 8 bit 1M 8bit 10ns 8bit 1MHz Yes Asynchronous Surface Mount TSOP 44 18.618 x 10.363 x 1.05mm 1.05mm
New
RS Stock No. 198-8007
Mfr. Part No.CY7C1049GN30-10VXIT
MYR18.562
Each (On a Reel of 500)
units
4096kbit 512K x 8 512K 16bit 10ns - - - - - - - - -
New
RS Stock No. 193-8466
Mfr. Part No.CY7C1049G30-10VXI
MYR264.679
Each (In a Tube of 19)
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. 170-2183
Mfr. Part No.IS61WV25616EDBLL-10TLI
BrandISSI
MYR15.46
Each (In a Tray of 135)
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. 181-7446
Mfr. Part No.CY7C1041G-10ZSXI
MYR25.281
Each (In a Tray of 135)
units
4Mbit 256K x 16 bit 256K 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
New
RS Stock No. 198-8005
Mfr. Part No.CY7C1041GN30-10ZSXIT
MYR16.844
Each (On a Reel of 1000)
units
4096kbit 256K x 16 256K 16bit 10ns - - - - - - - - -
RS Stock No. 146-3206
Mfr. Part No.47C04-I/SN
BrandMicrochip
MYR2.652
Each (In a Tube of 100)
units
4kbit 512K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 125-6983
Mfr. Part No.CY62157EV30LL-45ZSXI
MYR34.64
Each
units
8Mbit 512K x 16 bit 512K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 923-7598
Mfr. Part No.DS1225AD-200+
MYR67.12
Each (In a Tube of 12)
units
64kbit 8K x 8 bit 8K 8bit 200ns 13bit - Yes Asynchronous Through Hole EDIP 28 39.37 x 18.8 x 9.35mm 9.35mm
RS Stock No. 181-7603
Mfr. Part No.CY62256VNLL-70ZXI
MYR8.18
Each (In a Pack of 5)
units
256kbit 32K x 8 bit 32K 8bit 70ns - - Yes - Surface Mount TSOP 28 11.9 x 8.1 x 1.02mm 1.02mm
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