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. 538-249
Mfr. Part No.AS7C4098A-12TIN
kr 48,16
Each
Units
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 538-176
Mfr. Part No.AS6C1008-55TIN
kr 19,045
Each (In a Pack of 2)
Units
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS Stock No. 188-5323
Mfr. Part No.CY62148ELL-45ZSXI
kr 53,542
Each (In a Tray of 117)
Units
4Mbit 512k x 8 bit 512k 8bit 45ns - 1MHz Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 391-731
Mfr. Part No.IS61C1024AL-12JLI
BrandISSI
kr 20,14
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 7.75 x 2.67mm 2.67mm
RS Stock No. 124-2950
Mfr. Part No.CY7C109D-10VXI
kr 16,27
Each (In a Pack of 2)
Units
1Mbit 128K x 8 bit 128K 8bit 10ns 8bit 100MHz Yes Asynchronous Surface Mount SOJ 32 0.83 x 0.405 x 0.12in 3.05mm
RS Stock No. 823-4440
Mfr. Part No.23K256-E/ST
BrandMicrochip
kr 10,688
Each (In a Pack of 5)
Units
256kbit 32768 x 8 bit 32768 8bit 50ns 16bit 20MHz - Synchronous Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm
RS Stock No. 797-5879
Mfr. Part No.AS7C38096A-10TIN
kr 129,21
Each
Units
8Mbit 1M x 8 bit 1M 8bit 10ns 8bit 1MHz Yes Asynchronous Surface Mount TSOP 44 18.618 x 10.363 x 1.05mm 1.05mm
RS Stock No. 901-5751
Mfr. Part No.R1RP0416DSB-2PI#D0
kr 193,76
Each
Units
4Mbit 256K x 16 bit 256K 16bit 12ns - - Yes Asynchronous Surface Mount TSOP 32 21.05 x 10.26 x 1mm 1mm
RS Stock No. 538-215
Mfr. Part No.AS7C34096A-12TIN
kr 45,36
Each
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. 181-7594
Mfr. Part No.CY7C1041GN-10ZSXI
kr 43,27
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. 146-8899
Mfr. Part No.47C04-I/ST
BrandMicrochip
kr 4,708
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. 181-8359
Mfr. Part No.CY7C1069G30-10ZSXI-CYP
kr 437,28
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. 811-5194
Mfr. Part No.IS61WV5128BLL-10TLI
BrandISSI
kr 35,095
Each (In a Pack of 2)
Units
4Mbit 512k x 8 512k 8bit 10ns 19bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 797-9398
Mfr. Part No.DS1245AB-100+
kr 267,89
Each
Units
1024kbit 128K x 8 bit 128K 8bit 70ns 8bit - Yes - Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 10.92mm
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. 901-5745
Mfr. Part No.R1RP0416DGE-2LR#B0
kr 134,98
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