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. 912-6849
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
kr 20,151
Each (In a Tube of 100)
Units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 188-5316
Mfr. Part No.CY62126EV30LL-45ZSXI
kr 18,101
Each (In a Tray of 135)
Units
1Mbit 128k x 8 bit 128k 8bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 177-1641
Mfr. Part No.23K640-I/ST
BrandMicrochip
kr 5,992
Each (In a Pack of 20)
Units
64kbit 8192 words x 8 bit 8192 8bit - 16bit 20MHz Yes Synchronous Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm
New
RS Stock No. 193-8456
Mfr. Part No.CY621472E30LL-45ZSXI
kr 51,058
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. 797-9417
Mfr. Part No.DS1250Y-70IND+
kr 800,29
Each
Units
4096kbit 512K x 8 bit 512K 8bit 70ns 8bit - Yes - Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 10.92mm
RS Stock No. 538-170
Mfr. Part No.AS6C1008-55SIN
kr 18,445
Each (In a Pack of 2)
Units
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 714-4841
Mfr. Part No.IDT71321LA25JGI
BrandIDT
kr 143,67
Each
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. 126-6969
Mfr. Part No.R1LV1616HSA-4SI#B1
kr 479,56
Each
Units
16Mbit 1M words x 16 bit, 2M words x 8 bit 1M, 2M 8 bit, 16 bit 45ns 19 bit, 20 bit - Yes - Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS Stock No. 797-5888
Mfr. Part No.AS7C38098A-10BIN
kr 120,84
Each
Units
8Mbit 512K x 16 bit 512K 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TFBGA 48 6.05 x 8.05 x 1.05mm 1.05mm
RS Stock No. 124-2946
Mfr. Part No.CY62158EV30LL-45ZSXI
kr 67,40
Each
Units
8Mbit 1024K x 8 bit 1024K 8bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 126-6973
Mfr. Part No.R1LV5256ESP-5SI#B0
kr 33,50
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. 170-0897
Mfr. Part No.AS7C34096A-10TIN
kr 38,859
Each (In a Tray of 135)
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. 188-5321
Mfr. Part No.CY62136EV30LL-45ZSXI
kr 22,657
Each (In a Tray of 135)
Units
2Mbit 128k x 16 bit 128k 16bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 170-0920
Mfr. Part No.AS6C1616-55TIN
kr 83,377
Each (In a Tray of 135)
Units
16Mbit 1024K x 16 bit 1024K 16bit 55ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS Stock No. 170-2073
Mfr. Part No.IDT70V28L20PFGI
BrandIDT
kr 657,372
Each (In a Tray of 6)
Units
1024kbit 64K x 16 bit 64K 16bit 20ns 16bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 538-158
Mfr. Part No.AS6C6264-55PCN
kr 21,835
Each (In a Pack of 2)
Units
64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 188-5318
Mfr. Part No.CY62128EV30LL-45SXA
kr 38,05
Each (In a Tube of 25)
Units
1Mbit 128k x 8 bit 128k 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.88mm 2.88mm
RS Stock No. 170-2070
Mfr. Part No.IDT7133LA25JGI
BrandIDT
kr 180,368
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. 170-2049
Mfr. Part No.IS62C1024AL-35QLI
BrandISSI
kr 17,54
Each (In a Tray of 84)
Units
1Mbit 128K words x 8 bit 128K 8bit 35ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.43 x 3mm 3mm
RS Stock No. 538-287
Mfr. Part No.AS7C256A-12JIN
kr 18,545
Each (In a Pack of 2)
Units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount SOJ 28 18.54 x 7.75 x 2.67mm 2.67mm
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