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. 124-2944
Mfr. Part No.CY62157EV30LL-45ZXI
SGD16.97
Each
units
8Mbit 512K x 16 bit 512K 16bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 785-8691
Mfr. Part No.DS1225AD-200+
SGD36.61
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. 170-2178
Mfr. Part No.IS61C5128AS-25QLI
BrandISSI
SGD7.243
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. 889-5648
Mfr. Part No.23K256-I/SN
BrandMicrochip
SGD1.506
Each (In a Tube of 100)
units
256kbit 32768 words x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 165-9425
Mfr. Part No.DS1220AD-150+
SGD19.734
Each (In a Tube of 14)
units
16kbit 2K x 8 bit 2K 8bit 100ns 8bit - Yes - Through Hole EDIP 24 38.1 x 18.29 x 10.67mm 10.67mm
RS Stock No. 170-2047
Mfr. Part No.IS62C256AL-45ULI
BrandISSI
SGD2.073
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
RS Stock No. 823-4447
Mfr. Part No.23K256-E/SN
BrandMicrochip
SGD2.01
Each (In a Pack of 5)
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. 125-7519
Mfr. Part No.CY62187EV30LL-55BAXI
SGD115.24
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. 391-630
Mfr. Part No.IS62WV12816BLL-55TLI
BrandISSI
SGD4.485
Each (In a Pack of 2)
units
2Mbit 128K words x 16 bit 128K 16bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 666-8148
Mfr. Part No.23K256-I/SN
BrandMicrochip
SGD1.706
Each (In a Pack of 5)
units
256kbit 32768 words x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 124-2941
Mfr. Part No.CY62148ELL-55SXI
SGD7.37
Each (In a Pack of 2)
units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS Stock No. 171-0985
Mfr. Part No.CY62187EV30LL-55BAXI
SGD89.881
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
RS Stock No. 923-7598
Mfr. Part No.DS1225AD-200+
SGD24.563
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. 170-2045
Mfr. Part No.IS62WV12816BLL-55TLI
BrandISSI
SGD3.728
Each (In a Tray of 135)
units
2Mbit 128K words x 16 bit 128K 16bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 170-2150
Mfr. Part No.IDT71V416S10PHGI
BrandIDT
SGD8.939
Each (In a Tube of 26)
units
4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS Stock No. 811-5169
Mfr. Part No.IS61C5128AS-25QLI
BrandISSI
SGD8.84
Each (In a Pack of 2)
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. 170-2184
Mfr. Part No.IS61WV25616BLL-10BLI
BrandISSI
SGD6.167
Each (In a Tray of 480)
units
4Mbit 256k x 16 256k 16bit 10ns 18bit - - Asynchronous Surface Mount TFBGA 48 8.1 x 6.1 x 0.9mm 0.9mm
RS Stock No. 742-6724
Mfr. Part No.IDT71V416S10PHGI
BrandIDT
SGD9.24
Each
units
4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS Stock No. 178-4111
Mfr. Part No.23K256-E/SN
BrandMicrochip
SGD3.553
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. 811-5188
Mfr. Part No.IS61WV25616BLL-10BLI
BrandISSI
SGD8.08
Each (In a Pack of 2)
units
4Mbit 256k x 16 256k 16bit 10ns 18bit - - Asynchronous Surface Mount TFBGA 48 8.1 x 6.1 x 0.9mm 0.9mm
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