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. 188-5318
Mfr. Part No.CY62128EV30LL-45SXA
MYR17.38
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. 188-5302
Mfr. Part No.CY14B101LA-ZS25XI
MYR66.42
Each (In a Tray of 135)
units
1Mbit 128k x 8 bit 128k 8bit 25ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 811-5214
Mfr. Part No.IS62WV51216BLL-55BLI
BrandISSI
MYR28.79
Each
units
8Mbit 512k x 16 512k 16bit 55ns 19bit - Yes - Surface Mount BGA 48 8.8 x 7.3 x 0.9mm 0.9mm
RS Stock No. 146-3211
Mfr. Part No.47L04-I/P
BrandMicrochip
MYR3.24
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
RS Stock No. 767-5963
Mfr. Part No.R1WV6416RBG-7SI#B0
MYR256.56
Each
units
64Mbit 4M words x 16 bit 4M 16bit 70ns - - Yes Asynchronous Surface Mount FBGA 48 8.5 x 11 x 0.8mm 0.8mm
RS Stock No. 170-2179
Mfr. Part No.IS61C6416AL-12TLI
BrandISSI
MYR10.101
Each (In a Tray of 135)
units
1Mbit 64k x 16 64k 16bit 12ns 16bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 391-725
Mfr. Part No.IS61C1024AL-12KLI
BrandISSI
MYR13.015
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 10.29 x 3.75mm 3.75mm
RS Stock No. 181-8291
Mfr. Part No.S34ML01G200BHI000
MYR15.27
Each (In a Tray of 210)
units
1Gbit 2048K x 64 bit 2048K 64bit - 8bit - - Asynchronous Surface Mount BGA 63 11 x 9 x 1mm 1mm
RS Stock No. 178-4111
Mfr. Part No.23K256-E/SN
BrandMicrochip
MYR10.061
Each (In a Tube of 100)
units
256kbit 32768 x 8 bit 32768 8bit 50ns 16bit 20MHz - Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 125-6933
Mfr. Part No.CY14B101LA-ZS25XI
MYR84.58
Each
units
1Mbit 128K x 8 bit, 64K x 16 bit 128K, 64K 8 bit, 16 bit 25ns 8 bit, 16 bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 177-5513
Mfr. Part No.AS6C6264-55PCN
MYR9.585
Each (In a Tube of 15)
units
64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
New
RS Stock No. 193-8457
Mfr. Part No.CY621472E30LL-45ZSXI
MYR31.95
Each (In a Pack of 2)
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. 146-3208
Mfr. Part No.47C16-I/P
BrandMicrochip
MYR3.58
Each (In a Tube of 60)
units
16kbit 2048K x 8 - 8bit - - 1000kHz Yes Synchronous Through Hole DIP 8 10.2 x 7.1 x 4.83mm 4.83mm
RS Stock No. 126-6968
Mfr. Part No.R1LV1616HBG-4SI#B0
MYR313.81
Each
units
16Mbit 1M words x 16 bit 1M 16bit 45ns 20bit - Yes - Surface Mount FBGA 48 8 x 9.5 x 0.9mm 0.9mm
RS Stock No. 785-8691
Mfr. Part No.DS1225AD-200+
MYR72.52
Each
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. 538-154
Mfr. Part No.AS6C8008-55ZIN
MYR28.51
Each
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
RS Stock No. 188-5321
Mfr. Part No.CY62136EV30LL-45ZSXI
MYR14.113
Each (In a Tray of 135)
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. 538-158
Mfr. Part No.AS6C6264-55PCN
MYR10.66
Each (In a Pack of 2)
units
64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 170-0891
Mfr. Part No.AS6C1008-55PCN
MYR10.457
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. 182-3367
Mfr. Part No.CY7C1041G30-10ZSXE
MYR41.00
Each
units
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