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. 811-5175
Mfr. Part No.IS61WV102416BLL-10TLI
BrandISSI
£16.95
Each
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. 538-186
Mfr. Part No.AS6C6264-55SIN
£1.735
Each (In a Pack of 2)
Units
64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 170-2047
Mfr. Part No.IS62C256AL-45ULI
BrandISSI
£0.847
Each (In a Tray of 120)
Units
256kbit 32K words x 8 bit 32K 8bit 45ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.24 x 8.53 x 2.84mm 2.84mm
RS Stock No. 391-640
Mfr. Part No.IS62C256AL-45ULI
BrandISSI
£1.153
Each (In a Pack of 4)
Units
256kbit 32K words x 8 bit 32K 8bit 45ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.24 x 8.53 x 2.84mm 2.84mm
RS Stock No. 171-0984
Mfr. Part No.CY62177EV30LL-55ZXI
£30.46
Each (In a Tray of 96)
Units
32Mbit 2M x 16 bit 2M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 666-8148
Mfr. Part No.23K256-I/SN
BrandMicrochip
£0.888
Each (In a Pack of 5)
Units
256kbit 32768 words x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 889-5648
Mfr. Part No.23K256-I/SN
BrandMicrochip
£0.806
Each (In a Tube of 100)
Units
256kbit 32768 words x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 125-7518
Mfr. Part No.CY62177EV30LL-55ZXI
£30.00
Each
Units
32Mbit 2M x 16 bit 2M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 798-5208
Mfr. Part No.23LC512-I/SN
BrandMicrochip
£1.258
Each (In a Pack of 5)
Units
512kbit 64K x 8 bit 64K 8bit 5ns 8bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 923-7611
Mfr. Part No.DS1245Y-100+
£23.216
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. 803-2184
Mfr. Part No.23LCV512-I/P
BrandMicrochip
£1.48
Each (In a Pack of 5)
Units
512kbit 64K x 8 bit - 8bit 5ns 16bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 124-2947
Mfr. Part No.CY62167EV30LL-45BVXI
£8.75
Each
Units
16Mbit 1M x 16 bit, 2M x 8 bit 1M, 2M 8 bit, 16 bit 45ns 8 bit, 16 bit 1MHz Yes - Surface Mount VFBGA 48 6 x 8 x 0.79mm 0.79mm
New
RS Stock No. 188-5330
Mfr. Part No.CY62167EV30LL-45BVXI
£5.606
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. 178-4953
Mfr. Part No.23LCV512-I/P
BrandMicrochip
£1.386
Each (In a Tube of 60)
Units
512kbit 64K x 8 bit - - 5ns 16bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 178-4043
Mfr. Part No.23LC512-I/SN
BrandMicrochip
£1.137
Each (In a Tube of 100)
Units
512kbit 64K x 8 bit 64K 8bit 5ns 8bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 171-0973
Mfr. Part No.CY62138FV30LL-45ZAXI
£1.827
Each (In a Tray of 468)
Units
2Mbit 256K x 8 bit 256K 8bit 45ns 8bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 125-6979
Mfr. Part No.CY62138FV30LL-45ZAXI
£4.02
Each (In a Pack of 2)
Units
2Mbit 256K x 8 bit 256K 8bit 45ns 8bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 786-0739
Mfr. Part No.DS1245Y-100+
£25.54
Each
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. 538-176
Mfr. Part No.AS6C1008-55TIN
£1.735
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. 177-5533
Mfr. Part No.AS6C1008-55TIN
£1.372
Each (In a Tray of 156)
Units
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
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