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. 538-237
Mfr. Part No.AS7C1024C-12JIN
TWD156.50
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount SOJ 32 21.08 x 10.29 x 2.92mm 2.92mm
RS Stock No. 193-8454
Mfr. Part No.CY62146ELL-45ZSXI
TWD250.00
Each (In a Tray of 135)
units
4Mbit 256 k x 16 bit 256 k 16bit 45ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP II 44 18.517 x 10.262 x 1.044mm 1.04mm
RS Stock No. 391-725
Mfr. Part No.IS61C1024AL-12KLI
BrandISSI
TWD70.00
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount SOJ 32 21.08 x 10.29 x 3.75mm 3.75mm
RS Stock No. 193-8461
Mfr. Part No.CY7C1018DV33-10VXIT
TWD88.40
Each (In a Pack of 5)
units
1Mbit 128 k x 8 bit 128 k 8bit 10ns 8bit 1MHz - Asynchronous Through Hole SOJ 32 0.810 x 0.292 x 0.103in 2.62mm
RS Stock No. 171-0979
Mfr. Part No.CY62157EV30LL-55ZSXE
TWD337.70
Each (In a Tray of 135)
units
8Mbit 512K x 16 bit 512K 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
New
RS Stock No. 200-9836
Mfr. Part No.48L256-I/SN
BrandMicrochip
TWD60.60
Each (In a Pack of 5)
units
256kbit 32 k x 8 - 8bit 10ns - - - - - - - - -
RS Stock No. 181-7616
Mfr. Part No.CY7C1041G-10ZSXI
TWD220.00
Each (In a Pack of 2)
units
4Mbit 256K x 16 bit 256K 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 125-7542
Mfr. Part No.CY7C199D-10VXI
TWD70.80
Each (In a Pack of 5)
units
256kbit 32K x 8 bit 32K 8bit 15ns 8bit - Yes - Surface Mount SOJ 28 18.03 x 7.62 x 0.254mm 0.254mm
RS Stock No. 198-8008
Mfr. Part No.CY7C1049GN30-10VXIT
TWD164.50
Each (In a Pack of 2)
units
4096kbit 512K x 8 512K 16bit 10ns - - - - - - - - -
RS Stock No. 182-3297
Mfr. Part No.CY7C109D-10VXIT
TWD70.50
Each (On a Reel of 750)
units
1Mbit 128K x 8 bit 128K 8bit 10ns - 100MHz Yes Asynchronous Surface Mount SOJ 32 0.83 x 0.305 x 0.11mm 0.11mm
RS Stock No. 193-8456
Mfr. Part No.CY621472E30LL-45ZSXI
TWD156.80
Each (In a Tray of 135)
units
4Mbit 256 k x 16 bit 256 k 16bit 45ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP II 44 18.517 x 10.262 x 1.044mm 1.04mm
RS Stock No. 181-7450
Mfr. Part No.CY7C1049GN30-10ZSXI
TWD135.20
Each (In a Tray of 135)
units
4Mbit 512K x 8 bit 512K 8bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 125-6933
Mfr. Part No.CY14B101LA-ZS25XI
TWD695.00
Each
units
1Mbit 64K x 16 bit, 128K x 8 bit 64K, 128K 8 bit, 16 bit 25ns 8 bit, 16 bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 125-7516
Mfr. Part No.CY62167EV30LL-45ZXA
TWD491.00
Each
units
16Mbit 1M x 16 bit 1M 16bit 45ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 146-3210
Mfr. Part No.47C16-I/ST
BrandMicrochip
TWD22.50
Each (In a Tube of 100)
units
16kbit 2048K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 170-0745
Mfr. Part No.AS7C34096A-12TIN
TWD144.40
Each (In a Tray of 135)
units
4Mbit 512K words x 8 bit 512K 8bit 12ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 170-2078
Mfr. Part No.IDT71321LA25JGI
BrandIDT
TWD519.80
Each (In a Tube of 24)
units
16kbit 2K x 8 bit 2K 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 146-8925
Mfr. Part No.47C16-I/ST
BrandMicrochip
TWD25.30
Each (In a Pack of 10)
units
16kbit 2048K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 171-0981
Mfr. Part No.CY62167DV30LL-70BVI
TWD306.10
Each (In a Tray of 210)
units
16Mbit 1M x 16 bit 1M 16bit 70ns 16bit - Yes - Surface Mount VFBGA 48 8 x 9.5 x 0.81mm 0.81mm
RS Stock No. 501-6836
Mfr. Part No.R1RW0416DSB-2PR
TWD712.00
Each
units
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm