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. 181-8269
Mfr. Part No.CY7C1069G30-10ZSXI-CYP
£29.126
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
New
RS Stock No. 188-5302
Mfr. Part No.CY14B101LA-ZS25XI
£12.142
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. 181-7449
Mfr. Part No.CY7C1049G-10VXI
£4.518
Each (In a Tube of 19)
Units
4Mbit 512K x 8 bit 512K 8bit 10ns - - - Asynchronous Surface Mount SOJ 36 0.93 x 0.405 x 0.12in 3.05mm
RS Stock No. 177-1410
Mfr. Part No.23K640-I/ST
BrandMicrochip
£0.496
Each (In a Tube of 100)
Units
64kbit 8192 words x 8 bit 8192 8bit - 16bit 20MHz Yes Synchronous Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm
RS Stock No. 125-6969
Mfr. Part No.CY62126EV30LL-45ZSXI
£1.09
Each (In a Pack of 5)
Units
1Mbit 64K x 16 bit 64K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
New
RS Stock No. 188-5316
Mfr. Part No.CY62126EV30LL-45ZSXI
£1.588
Each (In a Tray of 135)
Units
1Mbit 128k x 8 bit 128k 8bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 182-3394
Mfr. Part No.CY7C1049GN30-10VXI
£4.105
Each (In a Pack of 2)
Units
- - - - - - - - - - - - - -
RS Stock No. 146-8951
Mfr. Part No.47L04-I/ST
BrandMicrochip
£0.531
Each (In a Pack of 10)
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. 181-7445
Mfr. Part No.CY7C1021DV33-10ZSXIT
£1.525
Each (On a Reel of 1000)
Units
1Mbit 64K x 16 bit 64K 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 181-8272
Mfr. Part No.CY14E256LA-SZ25XI
£14.837
Each (In a Tube of 22)
Units
256kbit 32K x 8 bit 32K 8bit 25ns - - Yes - Surface Mount SOIC 32 20.87 x 7.59 x 2.29mm 2.29mm
RS Stock No. 181-7573
Mfr. Part No.CY62128EV30LL-45ZXI
£1.853
Each (In a Pack of 4)
Units
1Mbit 128K x 8 bit 128K 8bit 45ns 8bit - Yes - Surface Mount TSOP 32 18.3 x 8.2 x 1.05mm 1.05mm
RS Stock No. 181-8359
Mfr. Part No.CY7C1069G30-10ZSXI-CYP
£33.54
Each
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. 125-6934
Mfr. Part No.CY14B104NA-ZS25XI
£25.24
Each
Units
4Mbit 256K x 16 bit, 512K x 8 bit 256K, 512K 8 bit, 16 bit 25ns 8 bit, 16 bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
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