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. 538-158
Mfr. Part No.AS6C6264-55PCN
SGD3.765
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. 177-5513
Mfr. Part No.AS6C6264-55PCN
SGD3.298
Each (In a Tube of 15)
units
64kbit 8k 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. 170-0735
Mfr. Part No.AS6C62256-55SIN
SGD2.509
Each (In a Tube of 25)
units
256kbit 32k x 8 bit 32k 8bit 55ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 538-142
Mfr. Part No.AS6C62256-55SIN
SGD2.83
Each (In a Pack of 2)
units
256kbit 32K words x 8 bit 32k 8bit 55ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 171-0984
Mfr. Part No.CY62177EV30LL-55ZXI
SGD68.541
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. 391-680
Mfr. Part No.IS62C1024AL-35QLI
BrandISSI
SGD3.125
Each (In a Pack of 2)
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. 125-7518
Mfr. Part No.CY62177EV30LL-55ZXI
SGD84.01
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. 391-719
Mfr. Part No.IS61C256AL-12JLI
BrandISSI
SGD1.655
Each (In a Pack of 4)
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. 170-2049
Mfr. Part No.IS62C1024AL-35QLI
BrandISSI
SGD3.364
Each (In a Tray of 84)
units
1Mbit 128k x 8 bit 128k 8bit 35ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.43 x 3mm 3mm
RS Stock No. 188-5323
Mfr. Part No.CY62148ELL-45ZSXI
SGD9.856
Each (In a Tray of 117)
units
4Mbit 512k x 8 bit 512k 8bit 45ns - 1MHz Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 811-5166
Mfr. Part No.IS61C256AL-12JLI-TR
BrandISSI
SGD1.873
Each (In a Pack of 4)
units
256kbit 32k x 8 bit 32k 8bit 12ns 15bit - Yes - Surface Mount SOJ 28 18.54 x 7.75 x 2.67mm 2.67mm
RS Stock No. 124-2940
Mfr. Part No.CY62148ELL-45ZSXI
SGD10.94
Each
units
4Mbit 512k x 8 bit 512k 8bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 744-4527
Mfr. Part No.U62256AS2C07LLG1
SGD6.28
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. 170-0888
Mfr. Part No.U62256AS2C07LLG1
SGD5.566
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. 714-4801
Mfr. Part No.IDT70V28L20PFGI
BrandIDT
SGD113.48
Each
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. 170-2193
Mfr. Part No.IS62WV51216BLL-55TLI
BrandISSI
SGD8.267
Each (In a Tray of 135)
units
8Mbit 512k x 16 bit 512k 16bit 55ns 19bit - Yes - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 811-5226
Mfr. Part No.IS62WV5128BLL-55HLI
BrandISSI
SGD8.53
Each (In a Pack of 2)
units
4Mbit 512k x 8 bit 512k 8bit 55ns 19bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 170-2194
Mfr. Part No.IS62WV5128BLL-55HLI
BrandISSI
SGD7.69
Each (In a Tray of 234)
units
4Mbit 512k x 8 bit 512k 8bit 55ns 19bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 170-2073
Mfr. Part No.IDT70V28L20PFGI
BrandIDT
SGD116.022
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. 811-5223
Mfr. Part No.IS62WV51216BLL-55TLI
BrandISSI
SGD10.22
Each
units
8Mbit 512k x 16 bit 512k 16bit 55ns 19bit - Yes - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
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