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. 177-5518
Mfr. Part No.AS6C1008-55SIN
PHP107.10
Each (In a Tube of 22)
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. 538-170
Mfr. Part No.AS6C1008-55SIN
PHP117.60
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. 188-5324
Mfr. Part No.CY62148ELL-55SXI
PHP229.95
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. 124-2941
Mfr. Part No.CY62148ELL-55SXI
PHP217.415
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. 177-5513
Mfr. Part No.AS6C6264-55PCN
PHP125.48
Each (In a Tube of 15)
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. 170-0749
Mfr. Part No.AS7C256A-12TIN
PHP92.93
Each (In a Tray of 234)
units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8 x 11.8 x 1.05mm 1.05mm
RS Stock No. 391-713
Mfr. Part No.IS61C256AL-12TLI
BrandISSI
PHP61.95
Each (In a Pack of 4)
units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8.1 x 11.9 x 1mm 1mm
RS Stock No. 125-7522
Mfr. Part No.CY62256NLL-55ZXI
PHP80.866
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
RS Stock No. 188-5331
Mfr. Part No.CY62256NLL-55ZXI
PHP102.783
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. 538-255
Mfr. Part No.AS7C256A-12TIN
PHP117.60
Each (In a Pack of 2)
units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8 x 11.8 x 1.05mm 1.05mm
RS Stock No. 170-2054
Mfr. Part No.IS61C256AL-12TLI
BrandISSI
PHP73.004
Each (In a Tray of 234)
units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8.1 x 11.9 x 1mm 1mm
RS Stock No. 538-158
Mfr. Part No.AS6C6264-55PCN
PHP142.445
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. 538-261
Mfr. Part No.AS7C3256A-12TIN
PHP111.30
Each (In a Pack of 2)
units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8 x 11.8 x 1.05mm 1.05mm
RS Stock No. 171-0971
Mfr. Part No.CY62137FV30LL-45ZSXI
PHP274.05
Each (In a Tray of 270)
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. 178-4043
Mfr. Part No.23LC512-I/SN
BrandMicrochip
PHP74.44
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. 170-2076
Mfr. Part No.IDT70V25L20PFGI
BrandIDT
PHP1,768.762
Each (In a Tray of 45)
units
128kbit 8K x 16 bit 8K 16bit 20ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 803-2181
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
PHP132.512
Each (In a Pack of 5)
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. 769-7342
Mfr. Part No.23LC1024-I/SN
BrandMicrochip
PHP117.545
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. 714-4835
Mfr. Part No.IDT70V25L20PFGI
BrandIDT
PHP1,948.69
Each
units
128kbit 8K x 16 bit 8K 16bit 20ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS Stock No. 177-5533
Mfr. Part No.AS6C1008-55TIN
PHP96.08
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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