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. 170-2057
Mfr. Part No.IS62C1024AL-35TLI
BrandISSI
TWD73.70
Each (In a Tray of 156)
units
1Mbit 128k x 8 bit 128k 8bit 35ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8.1 x 18.5 x 0.95mm 0.95mm
RS Stock No. 391-729
Mfr. Part No.IS62C1024AL-35TLI
BrandISSI
TWD64.00
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128k 8bit 35ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8.1 x 18.5 x 0.95mm 0.95mm
RS Stock No. 811-5172
Mfr. Part No.IS61C6416AL-12TLI
BrandISSI
TWD74.00
Each (In a Pack of 3)
units
1Mbit 64k x 16 bit 64k 16bit 12ns 16bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 170-2179
Mfr. Part No.IS61C6416AL-12TLI
BrandISSI
TWD54.40
Each (In a Tray of 135)
units
1Mbit 64k x 16 bit 64k 16bit 12ns 16bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 811-5175
Mfr. Part No.IS61WV102416BLL-10TLI
BrandISSI
TWD680.00
Each
units
16Mbit 1M x 16 bit 1M 16bit 10ns 20bit - Yes Asynchronous Surface Mount TSOP 48 18.6 x 12.2 x 1.05mm 1.05mm
RS Stock No. 391-707
Mfr. Part No.IS61LV25616AL-10TLI
BrandISSI
TWD172.00
Each
units
4Mbit 256K words x 16 bit 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 170-2180
Mfr. Part No.IS61WV102416BLL-10TLI
BrandISSI
TWD611.20
Each (In a Tray of 96)
units
16Mbit 1M x 16 bit 1M 16bit 10ns 20bit - Yes Asynchronous Surface Mount TSOP 48 18.6 x 12.2 x 1.05mm 1.05mm
RS Stock No. 811-5163
Mfr. Part No.IS61C6416AL-12KLI
BrandISSI
TWD92.30
Each (In a Pack of 4)
units
1Mbit 64k x 16 bit 64k 16bit 12ns 16bit - - - Surface Mount SOJ 44 28.7 x 10.29 x 3.11mm 3.11mm
RS Stock No. 170-2177
Mfr. Part No.IS61C6416AL-12KLI
BrandISSI
TWD93.80
Each (In a Tray of 16)
units
1Mbit 64k x 16 bit 64k 16bit 12ns 16bit - - - Surface Mount SOJ 44 28.7 x 10.29 x 3.11mm 3.11mm
RS Stock No. 170-2053
Mfr. Part No.IS61LV25616AL-10TLI
BrandISSI
TWD135.90
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 10.29 x 1.05mm 1.05mm
RS Stock No. 170-2056
Mfr. Part No.IS61C1024AL-12KLI
BrandISSI
TWD59.30
Each (In a Tube of 21)
units
1Mbit 128k x 8 bit 128k 8bit 12ns 17bit - Yes Asynchronous Surface Mount SOJ 32 21.08 x 10.29 x 3.75mm 3.75mm
RS Stock No. 811-5169
Mfr. Part No.IS61C5128AS-25QLI
BrandISSI
TWD142.00
Each (In a Pack of 2)
units
4Mbit 512k x 8 bit 512k 8bit 25ns 19bit - Yes - Surface Mount SOP 32 20.75 x 11.43 x 2.75mm 2.75mm
RS Stock No. 811-5188
Mfr. Part No.IS61WV25616BLL-10BLI
BrandISSI
TWD138.00
Each (In a Pack of 2)
units
4Mbit 256k x 16 bit 256k 16bit 10ns 18bit - - Asynchronous Surface Mount TFBGA 48 8.1 x 6.1 x 0.9mm 0.9mm
RS Stock No. 170-2194
Mfr. Part No.IS62WV5128BLL-55HLI
BrandISSI
TWD180.30
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. 811-5223
Mfr. Part No.IS62WV51216BLL-55TLI
BrandISSI
TWD261.00
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
RS Stock No. 170-2058
Mfr. Part No.IS61C1024AL-12JLI
BrandISSI
TWD67.40
Each (In a Tube of 22)
units
1Mbit 128k 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. 811-5185
Mfr. Part No.IS61WV25616EDBLL-10TLI
BrandISSI
TWD109.00
Each (In a Pack of 2)
units
4Mbit 256k x 16 bit 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 811-5214
Mfr. Part No.IS62WV51216BLL-55BLI
BrandISSI
TWD227.00
Each
units
8Mbit 512k x 16 bit 512k 16bit 55ns 19bit - Yes - Surface Mount BGA 48 8.8 x 7.3 x 0.9mm 0.9mm
RS Stock No. 811-5166
Mfr. Part No.IS61C256AL-12JLI-TR
BrandISSI
TWD45.50
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. 811-5181
Mfr. Part No.IS61WV25616BLL-10TLI
BrandISSI
TWD135.50
Each (In a Pack of 2)
units
4Mbit 256k x 16 bit 256k 16bit 10ns 18bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm