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. It’s 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 computer’s 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
• Reliability
Disadvantages include:
• Capacity
• Varying power consumption
Can 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. 171-0993
Mfr. Part No.CY7C1059DV33-10ZSXI
£8.408
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. 125-7536
Mfr. Part No.CY7C1059DV33-10ZSXI
£10.55
Each
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. 769-7342
Mfr. Part No.23LC1024-I/SN
BrandMicrochip
£1.765
Each (In a Pack of 2)
Units
1Mbit 128K words x 8 bit 128Kk 8bit 5ns 24bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 889-5538
Mfr. Part No.23LC1024-I/SN
BrandMicrochip
£1.592
Each (In a Tube of 100)
Units
1Mbit 128K words x 8 bit 128Kk 8bit 5ns 24bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 125-6971
Mfr. Part No.CY62128ELL-45SXI
£2.315
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. 171-0985
Mfr. Part No.CY62187EV30LL-55BAXI
£48.043
Each (In a Tray of 210)
Units
64Mbit 4M x 16 bit 4M 16bit 55ns 16bit - Yes - Surface Mount VFBGA 48 8 x 9.5 x 1.2mm 1.2mm
New
RS Stock No. 188-5317
Mfr. Part No.CY62128ELL-45SXI
£2.019
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. 125-7519
Mfr. Part No.CY62187EV30LL-55BAXI
£58.34
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. 170-0752
Mfr. Part No.AS6C8016-55ZIN
£4.371
Each (In a Tray of 135)
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. 538-271
Mfr. Part No.AS6C8016-55ZIN
£5.42
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. 767-5967
Mfr. Part No.R1WV6416RSD-5SI#B0
£33.79
Each
Units
64Mbit 4M words x 16 bit 4M 16bit 55ns - - Yes Asynchronous Surface Mount μTSOP II 52 10.89 x 8.99 x 1mm 1mm
RS Stock No. 666-8150
Mfr. Part No.23K640-I/SN
BrandMicrochip
£0.518
Each (In a Pack of 5)
Units
64kbit 8192 words x 8 bit 8K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 178-4005
Mfr. Part No.23K640-I/SN
BrandMicrochip
£0.465
Each (In a Tube of 100)
Units
64kbit 8192 words x 8 bit 8K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 102-3554
Mfr. Part No.M48Z58-70PC1
£11.819
Each (In a Tube of 12)
Units
64kbit 8K x 8 bit 8K 8bit 70ns 13bit 1MHz Yes - Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 8.89mm
RS Stock No. 810-3576
Mfr. Part No.M48Z58-70PC1
£13.00
Each
Units
64kbit 8K x 8 bit 8K 8bit 70ns 13bit 1MHz Yes - Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 8.89mm
RS Stock No. 391-680
Mfr. Part No.IS62C1024AL-35QLI
BrandISSI
£1.445
Each (In a Pack of 2)
Units
1Mbit 128K words x 8 bit 128K 8bit 35ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.43 x 3mm 3mm
RS Stock No. 767-5941
Mfr. Part No.R1LV1616HSA-4SI#B0
£12.74
Each
Units
16Mbit 2M words x 8 bit 2M 8bit 45ns - - Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1mm 1mm
RS Stock No. 170-2049
Mfr. Part No.IS62C1024AL-35QLI
BrandISSI
£1.393
Each (In a Tray of 84)
Units
1Mbit 128K words x 8 bit 128K 8bit 35ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.43 x 3mm 3mm
RS Stock No. 811-5175
Mfr. Part No.IS61WV102416BLL-10TLI
BrandISSI
£16.95
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. 170-2047
Mfr. Part No.IS62C256AL-45ULI
BrandISSI
£0.847
Each (In a Tray of 120)
Units
256kbit 32K words x 8 bit 32K 8bit 45ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.24 x 8.53 x 2.84mm 2.84mm
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