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
New
RS Stock No. 200-9830
Mfr. Part No.48LM01-I/SM
BrandMicrochip
kr 30,721
Each (In a Tube of 90)
Units
1Mbit 128k x 8 1, 31, 072 8bit 10ns - - - - - - - - -
RS Stock No. 901-5749
Mfr. Part No.R1RP0416DGE-2PR#B0
kr 187,83
Each
Units
4Mbit 256K x 16 bit 256K 16bit 12ns 16bit 1MHz - - Surface Mount SOJ 44 28.7 x 10.29 x 2.75mm 2.75mm
RS Stock No. 901-5777
Mfr. Part No.R1RW0416DSB-0PR#D0
kr 181,03
Each
Units
4Mbit 256K x 16 bit 256K 16bit 10ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1mm 1mm
RS Stock No. 188-5331
Mfr. Part No.CY62256NLL-55ZXI
kr 14,282
Each (In a Tray of 234)
Units
256kbit 32k x 8 bit 32k 8bit 55ns - 1MHz Yes - Surface Mount TSOP 28 11.9 x 8.1 x 1.15mm 1.15mm
RS Stock No. 170-2180
Mfr. Part No.IS61WV102416BLL-10TLI
BrandISSI
kr 173,506
Each (In a Tray of 96)
Units
16Mbit 1M x 16 1M 16bit 10ns 20bit - Yes Asynchronous Surface Mount TSOP 48 18.6 x 12.2 x 1.05mm 1.05mm
RS Stock No. 126-6972
Mfr. Part No.R1LV5256ESA-5SI#B1
kr 32,10
Each
Units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes - Surface Mount SOP 28 11.9 x 8.1 x 1mm 1mm
RS Stock No. 188-5330
Mfr. Part No.CY62167EV30LL-45BVXI
kr 66,117
Each (In a Tray of 480)
Units
16Mbit 2M x 8 bit 2M 8bit 45ns 16bit 1MHz Yes - Surface Mount VFBGA 48 8 x 6 x 0.55mm 0.55mm
RS Stock No. 803-2272
Mfr. Part No.23LCV1024-I/P
BrandMicrochip
kr 20,578
Each (In a Pack of 5)
Units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 811-5185
Mfr. Part No.IS61WV25616EDBLL-10TLI
BrandISSI
kr 28,435
Each (In a Pack of 2)
Units
4Mbit 256k x 16 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
New
RS Stock No. 194-8872
Mfr. Part No.CY62147EV18LL-55BVXI
kr 51,545
Each (In a Pack of 2)
Units
- - - - - - - - - - - - - -
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