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. 188-5339
Mfr. Part No.CY7C109D-10VXI
£2.068
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. 126-6974
Mfr. Part No.R1WV6416RSA-5SI#B0
£63.81
Each
Units
64Mbit 4M words x 16 bit, 8M words x 8 bit 4M, 8M 8 bit, 16 bit 55ns 21 bit, 22 bit - Yes - Surface Mount TSOP 48 18.5 x 12.1 x 1mm 1mm
RS Stock No. 170-2058
Mfr. Part No.IS61C1024AL-12JLI
BrandISSI
£1.64
Each (In a Tube of 22)
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. 171-0977
Mfr. Part No.CY62157EV30LL-45ZSXI
£4.949
Each (In a Tray of 270)
Units
8Mbit 512K x 16 bit 512K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 125-6983
Mfr. Part No.CY62157EV30LL-45ZSXI
£6.34
Each
Units
8Mbit 512K x 16 bit 512K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 171-0969
Mfr. Part No.CY62137EV30LL-45ZSXI
£1.555
Each (In a Tray of 405)
Units
2Mbit 128K x 16 bit 128K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 125-6980
Mfr. Part No.CY62148ESL-55ZAXI
£5.19
Each
Units
4Mbit 512K x 8 bit 512K 8bit 55ns 8bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 171-0974
Mfr. Part No.CY62148ESL-55ZAXI
£4.23
Each (In a Tray of 234)
Units
4Mbit 512K x 8 bit 512K 8bit 55ns 8bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 170-0888
Mfr. Part No.U62256AS2C07LLG1
£2.97
Each (In a Tube of 25)
Units
256kbit 32K x 8 bit 32K 8bit 56ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 797-5872
Mfr. Part No.AS7C316098A-10TIN
£15.68
Each
Units
16Mbit 1024K x 16 bit 1024K 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS Stock No. 538-287
Mfr. Part No.AS7C256A-12JIN
£1.675
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
RS Stock No. 125-6975
Mfr. Part No.CY62137EV30LL-45ZSXI
£1.48
Each (In a Pack of 2)
Units
2Mbit 128K x 16 bit 128K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 744-4527
Mfr. Part No.U62256AS2C07LLG1
£3.35
Each (In a Pack of 2)
Units
256kbit 32K x 8 bit 32K 8bit 56ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 124-2950
Mfr. Part No.CY7C109D-10VXI
£2.395
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. 744-4573
Mfr. Part No.AS7C34098A-10TCN
£4.11
Each
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. 170-0898
Mfr. Part No.AS7C34098A-10TCN
£3.366
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. 125-6937
Mfr. Part No.CY14B256LA-SZ45XI
£8.45
Each
Units
256kbit 32K x 8 bit 32K 8bit 45ns 8bit - - - Surface Mount SOIC 32 20.878 x 7.594 x 2.286mm 2.286mm
RS Stock No. 171-0964
Mfr. Part No.CY14B256LA-SZ45XI
£8.588
Each (In a Tube of 44)
Units
256kbit 32K x 8 bit 32K 8bit 45ns 8bit - - - Surface Mount SOIC 32 20.878 x 7.594 x 2.286mm 2.286mm
RS Stock No. 170-0753
Mfr. Part No.AS7C256A-12JIN
£1.49
Each (In a Tube of 25)
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
RS Stock No. 171-0991
Mfr. Part No.CY7C1021CV33-12ZSXE
£3.21
Each (In a Tray of 270)
Units
1Mbit 64K x 16 bit 64K 16bit 12ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
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