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. 811-5197
Mfr. Part No.IS61WV6416DBLL-10TLI
BrandISSI
SGD2.773
Each (In a Pack of 3)
units
1Mbit 64k x 16 64k 16bit 10ns 16bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 803-2190
Mfr. Part No.23LCV1024-I/ST
BrandMicrochip
SGD3.822
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 189-7468
Mfr. Part No.DS1245Y-100+
SGD46.40
Each (In a Tube of 11)
units
1Mbit 128K x 8 bit 128K 8bit 100ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 170-0746
Mfr. Part No.AS7C4096A-12TIN
SGD6.54
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. 188-5337
Mfr. Part No.CY7C1051DV33-10ZSXI
SGD19.402
Each (In a Tray of 135)
units
8Mbit 512k x 16 bit 512k 16bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 170-0738
Mfr. Part No.AS6C4008-55SIN
SGD5.97
Each (In a Tube of 22)
units
4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 171-0994
Mfr. Part No.CY7C1350G-133AXC
SGD8.44
Each (In a Tray of 360)
units
4Mbit 128K x 36 bit 128K 36bit - - - Yes - Surface Mount TQFP 100 14.1 x 20.1 x 1.45mm 1.45mm
RS Stock No. 823-4532
Mfr. Part No.23LC512-I/ST
BrandMicrochip
SGD2.45
Each (In a Pack of 5)
units
512kbit 64k x 8 bit 64K 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 181-7573
Mfr. Part No.CY62128EV30LL-45ZXI
SGD3.00
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. 181-7582
Mfr. Part No.CY62147EV30LL-45ZSXI
SGD4.64
Each (In a Pack of 3)
units
4Mbit 256K x 16 bit 256K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 194-8913
Mfr. Part No.CY7C1021DV33-10VXI
SGD3.688
Each (In a Tube of 17)
units
1Mbit 64K x 16 bit 64K 16bit 10ns 16bit 1MHz - Asynchronous Surface Mount SOJ 44 1.13 x 0.405 x 0.12in 3.05mm
RS Stock No. 811-5208
Mfr. Part No.IS62WV1288BLL-55TLI
BrandISSI
SGD2.61
Each (In a Pack of 3)
units
1Mbit 128k x 8 128k 8bit 55ns 17bit - Yes - Surface Mount TSOP 32 18.5 x 8.1 x 0.95mm 0.95mm
RS Stock No. 181-1578
Mfr. Part No.CY7C1041GN30-10ZSXI
SGD7.385
Each (In a Pack of 2)
units
4Mbit 256 kB x 16 256k 8bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 744-4558
Mfr. Part No.AS7C31024B-12TCN
SGD4.39
Each
units
1Mbit 128K x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount TSOP 32 18.5 x 8.1 x 1.05mm 1.05mm
RS Stock No. 170-0898
Mfr. Part No.AS7C34098A-10TCN
SGD6.54
Each (In a Tray of 135)
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. 797-9467
Mfr. Part No.DS1345YP-100+
SGD39.71
Each
units
1024kbit 128K x 8 bit 128K 8bit 70ns 8bit - - - Surface Mount Power Cap 34 0.995 x 0.93 x 0.032in 0.81mm
RS Stock No. 188-5339
Mfr. Part No.CY7C109D-10VXI
SGD3.968
Each (In a Tube of 23)
units
1Mbit 128k x 8 bit 128k 8bit 10ns - 100MHz - Asynchronous Surface Mount SOJ 32 0.83 x 0.405 x 0.11in 2.79mm
RS Stock No. 769-7342
Mfr. Part No.23LC1024-I/SN
BrandMicrochip
SGD3.31
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128Kk 8bit 5ns 24bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 193-8464
Mfr. Part No.CY7C1021DV33-10VXIT
SGD3.499
Each (On a Reel of 500)
units
1Mbit 64 k x 16 bit 64 k 16bit 10ns 16bit 1MHz - Asynchronous Through Hole SOJ 44 1.12 x 0.395 x 0.095in 2.41mm
RS Stock No. 171-0993
Mfr. Part No.CY7C1059DV33-10ZSXI
SGD17.30
Each (In a Tray of 135)
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
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