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. 797-9467
Mfr. Part No.DS1345YP-100+
£21.00
Each
Units
1024kbit 128K x 8 bit 128K 8bit 70ns 8bit - - - Surface Mount Power Cap 34 0.995 x 0.93 x 0.032in 0.81mm
RS Stock No. 165-9584
Mfr. Part No.DS1345YP-100+
£19.091
Each (In a Tube of 40)
Units
1024kbit 128K x 8 bit 128K 8bit 70ns 8bit - - - Surface Mount Power Cap 34 0.995 x 0.93 x 0.032in 0.81mm
RS Stock No. 823-4532
Mfr. Part No.23LC512-I/ST
BrandMicrochip
£1.288
Each (In a Pack of 5)
Units
512kbit 64k x 8 bit 64K 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 178-4938
Mfr. Part No.23K256-I/P
BrandMicrochip
£0.883
Each (In a Tube of 60)
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. 178-4114
Mfr. Part No.23LC512-I/ST
BrandMicrochip
£1.168
Each (In a Tube of 100)
Units
512kbit 64k x 8 bit 64K 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 742-4692
Mfr. Part No.IDT6116LA25SOGI
BrandIDT
£5.53
Each
Units
16kbit 2K x 8 bit 2K 8bit 25ns 11bit - Yes Asynchronous Surface Mount SOIC 24 15.4 x 7.6 x 2.34mm 2.34mm
RS Stock No. 666-8144
Mfr. Part No.23K256-I/P
BrandMicrochip
£0.94
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. 923-7747
Mfr. Part No.DS1225AB-85+
£13.73
Each (In a Tube of 12)
Units
64kbit 8K x 8 bit 8K 8bit 70ns 8bit - Yes - Through Hole EDIP 28 39.37 x 18.29 x 10.67mm 10.67mm
RS Stock No. 797-9372
Mfr. Part No.DS1225AB-85+
£15.10
Each
Units
64kbit 8K x 8 bit 8K 8bit 85ns 8bit - Yes - Through Hole EDIP 28 39.37 x 18.29 x 10.67mm 10.67mm
New
RS Stock No. 188-5320
Mfr. Part No.CY62128EV30LL-45ZAXI
£1.932
Each (In a Tray of 234)
Units
1Mbit 128k x 8 bit 128k 8bit 45ns - 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 538-255
Mfr. Part No.AS7C256A-12TIN
£1.675
Each (In a Pack of 2)
Units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8 x 11.8 x 1.05mm 1.05mm
RS Stock No. 124-2937
Mfr. Part No.CY62128EV30LL-45ZAXI
£1.44
Each (In a Pack of 5)
Units
1Mbit 128K x 8 bit 128K 8bit 45ns 8bit 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 170-0749
Mfr. Part No.AS7C256A-12TIN
£1.323
Each (In a Tray of 234)
Units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8 x 11.8 x 1.05mm 1.05mm
RS Stock No. 124-2941
Mfr. Part No.CY62148ELL-55SXI
£3.985
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
New
RS Stock No. 188-5328
Mfr. Part No.CY62158ELL-45ZSXI
£6.978
Each (In a Tray of 135)
Units
8Mbit 512k x 16 bit 512k 16bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 769-7349
Mfr. Part No.23LC1024-I/ST
BrandMicrochip
£1.795
Each (In a Pack of 2)
Units
1Mbit 128K words x 8 bit 128Kk 8bit - 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
New
RS Stock No. 188-5324
Mfr. Part No.CY62148ELL-55SXI
£3.283
Each (In a Tube of 25)
Units
4Mbit 512k x 8 bit 512k 8bit 55ns - 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.88mm 2.88mm
RS Stock No. 124-2945
Mfr. Part No.CY62158ELL-45ZSXI
£5.98
Each
Units
8Mbit 1M x 8 bit 1M 8bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 912-2859
Mfr. Part No.23LC1024-I/ST
BrandMicrochip
£1.623
Each (In a Tube of 100)
Units
1Mbit 128K words x 8 bit 128K 8bit - 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 125-6975
Mfr. Part No.CY62137EV30LL-45ZSXI
£1.48
Each (In a Pack of 2)
Units
2Mbit 128K x 16 bit 128K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
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