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. 912-2859
Mfr. Part No.23LC1024-I/ST
BrandMicrochip
TWD70.80
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. 170-2070
Mfr. Part No.IDT7133LA25JGI
BrandIDT
TWD850.10
Each (In a Tube of 18)
units
32kbit 2K x 16 bit 2K 16bit 25ns 16bit - Yes Asynchronous Surface Mount PLCC 68 24 x 24 x 3.63mm 3.63mm
RS Stock No. 146-8876
Mfr. Part No.47C04-I/P
BrandMicrochip
TWD26.60
Each (In a Pack of 10)
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. 181-7446
Mfr. Part No.CY7C1041G-10ZSXI
TWD170.00
Each (In a Tray of 135)
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. 193-8453
Mfr. Part No.CY62126EV30LL-45ZSXIT
TWD79.80
Each (In a Pack of 5)
units
1Mbit 64 k x 16 bit 64 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. 198-8005
Mfr. Part No.CY7C1041GN30-10ZSXIT
TWD105.50
Each (On a Reel of 1000)
units
4096kbit 256K x 16 256K 16bit 10ns - - - - - - - - -
RS Stock No. 125-7536
Mfr. Part No.CY7C1059DV33-10ZSXI
TWD528.00
Each
units
8Mbit 1M x 8 bit 1M 8bit 10ns 8bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 744-4573
Mfr. Part No.AS7C34098A-10TCN
TWD191.00
Each
units
4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS Stock No. 181-7442
Mfr. Part No.CY62148ELL-55SXIT
TWD109.80
Each (On a Reel of 1000)
units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS Stock No. 744-4570
Mfr. Part No.AS7C34096A-10TIN
TWD182.00
Each
units
4Mbit 512K x 8 bit 512K 8bit 10ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS Stock No. 198-8001
Mfr. Part No.CY62157EV30LL-45ZSXIT
TWD285.00
Each
units
8192kbit 512K x 16 512K 16bit 45ns - - - - - - - - -
RS Stock No. 198-8000
Mfr. Part No.CY62157EV30LL-45ZSXIT
TWD189.30
Each (On a Reel of 1000)
units
8192kbit 512K x 16 512K 16bit 45ns - - - - - - - - -