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. 124-2941
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. 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. 391-640
Mfr. Part No.IS62C256AL-45ULI
BrandISSI
SGD2.27
Each (In a Pack of 4)
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. 165-9425
Mfr. Part No.DS1220AD-150+
BrandMaxim
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. 181-8269
Mfr. Part No.CY7C1069G30-10ZSXI-CYP
SGD65.824
Each (In a Tray of 108)
units
16Mbit 2M x 8 bit 2M 8bit 10ns - 100MHz - Asynchronous Surface Mount TSOP 54 22.51 x 10.26 x 1.05mm 1.05mm
RS Stock No. 797-9360
Mfr. Part No.DS1220AD-200IND+
BrandMaxim
SGD29.13
Each
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. 146-3206
Mfr. Part No.47C04-I/SN
BrandMicrochip
SGD0.863
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. 146-3213
Mfr. Part No.47L04-I/ST
BrandMicrochip
SGD0.94
Each (In a Tube of 100)
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. 181-8270
Mfr. Part No.CY14B101PA-SFXI
SGD16.176
Each (In a Tube of 46)
units
1Mbit 128K x 8 bit 128K 8bit - - 104MHz Yes Synchronous Surface Mount SOIC 16 10.49 x 7.59 x 2.36mm 2.36mm
RS Stock No. 170-0893
Mfr. Part No.AS7C3513B-12TCN
SGD3.789
Each (In a Tray of 135)
units
512kbit 32K x 16 bit 32K 16bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS Stock No. 171-0963
Mfr. Part No.CY14B108N-ZSP45XI
SGD53.889
Each (In a Tray of 108)
units
8Mbit 512K x 16 bit 512K 16bit 45ns 16bit - Yes Asynchronous Surface Mount TSOP 54 22.517 x 10.262 x 1.05mm 1.05mm
RS Stock No. 181-8291
Mfr. Part No.S34ML01G200BHI000
SGD5.392
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. 767-5951
Mfr. Part No.R1LV3216RSD-5SI#B0
SGD46.57
Each
units
32Mbit 2M words x 16 bit 2M 16bit 55ns - - Yes Asynchronous Surface Mount μTSOP II 52 10.89 x 8.99 x 1mm 1mm
RS Stock No. 146-3211
Mfr. Part No.47L04-I/P
BrandMicrochip
SGD1.187
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. 171-0968
Mfr. Part No.CY62128ELL-45ZXI
SGD2.983
Each (In a Tray of 312)
units
1Mbit 128K x 16 bit 128K 16bit 45ns 6bit - Yes - Surface Mount SOIC 32 20.751 x 11.43 x 2.895mm 2.895mm
RS Stock No. 125-7527
Mfr. Part No.CY7C1011DV33-10ZSXI
SGD6.57
Each (In a Pack of 2)
units
2Mbit 128K x 16 bit 128K 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 742-6715
Mfr. Part No.IDT71V416L10PHGI
BrandIDT
SGD10.57
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. 715-4356
Mfr. Part No.23K256-I/ST
BrandMicrochip
SGD2.42
Each
units
256kbit 32K x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3 x 4.4 x 1mm 1mm
RS Stock No. 126-6975
Mfr. Part No.RMLV0408EGSA-4S2#AA1
SGD8.76
Each
units
4Mbit 512K words x 8 bit 512K 8bit 45ns 19bit - Yes - Surface Mount sTSOP 32 11.9 x 8.1 x 1mm 1mm
RS Stock No. 170-0894
Mfr. Part No.AS7C31024B-12TCN
SGD3.263
Each (In a Tray of 156)
units
1Mbit 128K x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount TSOP 32 18.5 x 8.1 x 1.05mm 1.05mm
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