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. 181-7597
Mfr. Part No.CY62148EV30LL-45ZSXI
$6.82
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. 170-2053
Mfr. Part No.IS61LV25616AL-10TLI
BrandISSI
$7.592
Each (In a Tray of 135)
units
4Mbit 256K words x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 803-2184
Mfr. Part No.23LCV512-I/P
BrandMicrochip
$2.77
Each (In a Pack of 5)
units
512kbit 64K x 8 bit - 8bit 5ns 16bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 803-2181
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
$3.67
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 391-707
Mfr. Part No.IS61LV25616AL-10TLI
BrandISSI
$6.88
Each
units
4Mbit 256K words x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 170-2178
Mfr. Part No.IS61C5128AS-25QLI
BrandISSI
$7.21
Each (In a Tray of 84)
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. 912-6849
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
$3.39
Each (In a Tube of 100)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 666-8144
Mfr. Part No.23K256-I/P
BrandMicrochip
$1.76
Each (In a Pack of 5)
units
256kbit 32768 words x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Through Hole PDIP 8 9.27 x 6.35 x 3.3mm 3.3mm
RS Stock No. 811-5175
Mfr. Part No.IS61WV102416BLL-10TLI
BrandISSI
$32.29
Each
units
16Mbit 1M x 16 1M 16bit 10ns 20bit - Yes Asynchronous Surface Mount TSOP 48 18.6 x 12.2 x 1.05mm 1.05mm
RS Stock No. 170-0922
Mfr. Part No.AS7C316096A-10TIN
$53.258
Each (In a Tray of 156)
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. 125-7533
Mfr. Part No.CY7C1021DV33-10ZSXI
$4.02
Each (In a Pack of 5)
units
1Mbit 64K x 16 bit 64K 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 666-8138
Mfr. Part No.23A256-I/SN
BrandMicrochip
$1.902
Each (In a Pack of 5)
units
256kbit 32768 words x 8 bit 32K 8bit 32ns 16bit 16MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 188-5323
Mfr. Part No.CY62148ELL-45ZSXI
$9.812
Each (In a Tray of 117)
units
4Mbit 512k x 8 bit 512k 8bit 45ns - 1MHz Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 761-7056
Mfr. Part No.R1LP0108ESR-7SI#B0
$7.97
Each
units
1Mbit 128K x 8 bit 128K 8bit 70ns - - Yes Asynchronous Surface Mount TSOP 32 - -
RS Stock No. 391-713
Mfr. Part No.IS61C256AL-12TLI
BrandISSI
$1.80
Each (In a Pack of 4)
units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8.1 x 11.9 x 1mm 1mm
RS Stock No. 125-6971
Mfr. Part No.CY62128ELL-45SXI
$4.66
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. 538-271
Mfr. Part No.AS6C8016-55ZIN
$11.08
Each
units
8Mbit 512K words x 16 bit 512K 16bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
RS Stock No. 125-7517
Mfr. Part No.CY62167EV30LL-45ZXI
$26.78
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. 538-221
Mfr. Part No.AS7C4096A-12TIN
$8.38
Each
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. 170-0737
Mfr. Part No.AS6C8008-55ZIN
$12.269
Each (In a Tray of 135)
units
8Mbit 1024K words x 8 bit 1M 8bit 55ns 20bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
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