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. 125-7542
Mfr. Part No.CY7C199D-10VXI
MYR8.59
Each (In a Pack of 5)
units
256kbit 32K x 8 bit 32K 8bit 15ns 8bit - Yes - Surface Mount SOJ 28 18.03 x 7.62 x 0.254mm 0.254mm
RS Stock No. 538-148
Mfr. Part No.AS6C62256-55PCN
MYR10.055
Each (In a Pack of 2)
units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 125-7522
Mfr. Part No.CY62256NLL-55ZXI
MYR6.09
Each (In a Pack of 5)
units
256kbit 32K x 8 bit 32K 8bit 55ns - - Yes - Surface Mount TSOP 28 11.9 x 8.1 x 1mm 1mm
New
RS Stock No. 188-5331
Mfr. Part No.CY62256NLL-55ZXI
MYR6.604
Each (In a Tray of 234)
units
256kbit 32k x 8 bit 32k 8bit 55ns - 1MHz Yes - Surface Mount TSOP 28 11.9 x 8.1 x 1.15mm 1.15mm
RS Stock No. 170-0736
Mfr. Part No.AS6C62256-55PCN
MYR9.33
Each (In a Tube of 15)
units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 171-0974
Mfr. Part No.CY62148ESL-55ZAXI
MYR22.66
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. 125-6980
Mfr. Part No.CY62148ESL-55ZAXI
MYR28.10
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. 170-0895
Mfr. Part No.AS6C4008-55PCN
MYR17.938
Each (In a Tube of 13)
units
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
New
RS Stock No. 188-5324
Mfr. Part No.CY62148ELL-55SXI
MYR17.91
Each (In a Tube of 25)
units
4Mbit 512k x 8 bit 512k 8bit 55ns - 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.88mm 2.88mm
RS Stock No. 125-6971
Mfr. Part No.CY62128ELL-45SXI
MYR12.47
Each (In a Pack of 2)
units
1Mbit 128K x 16 bit 128K 16bit 45ns 8bit - Yes - Surface Mount SOIC 32 20.751 x 11.43 x 2.895mm 2.895mm
RS Stock No. 171-0964
Mfr. Part No.CY14B256LA-SZ45XI
MYR60.08
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. 797-9467
Mfr. Part No.DS1345YP-100+
BrandMaxim
MYR105.69
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. 165-9584
Mfr. Part No.DS1345YP-100+
BrandMaxim
MYR97.30
Each (In a Tube of 40)
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
New
RS Stock No. 188-5336
Mfr. Part No.CY7C1021DV33-10ZSXI
MYR9.973
Each (In a Tray of 135)
units
1Mbit 128k x 8 bit 128k 8bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 744-4561
Mfr. Part No.AS6C4008-55PCN
MYR19.78
Each
units
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 171-0986
Mfr. Part No.CY7C1011DV33-10ZSXI
MYR14.07
Each (In a Tray of 270)
units
2Mbit 128K x 16 bit 128K 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 125-7533
Mfr. Part No.CY7C1021DV33-10ZSXI
MYR10.76
Each (In a Pack of 5)
units
1Mbit 64K x 16 bit 64K 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 124-2941
Mfr. Part No.CY62148ELL-55SXI
MYR20.00
Each (In a Pack of 2)
units
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS Stock No. 125-7527
Mfr. Part No.CY7C1011DV33-10ZSXI
MYR17.83
Each (In a Pack of 2)
units
2Mbit 128K x 16 bit 128K 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 170-2180
Mfr. Part No.IS61WV102416BLL-10TLI
BrandISSI
MYR133.935
Each (In a Tray of 96)
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
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