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. 188-5320
Mfr. Part No.CY62128EV30LL-45ZAXI
TWD60.30
Each (In a Tray of 234)
units
1Mbit 128k x 8 bit 128k 8bit 45ns - 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 124-2937
Mfr. Part No.CY62128EV30LL-45ZAXI
TWD65.00
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit 128K 8bit 45ns 8bit 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 538-148
Mfr. Part No.AS6C62256-55PCN
TWD70.50
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. 170-0736
Mfr. Part No.AS6C62256-55PCN
TWD74.10
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. 391-729
Mfr. Part No.IS62C1024AL-35TLI
BrandISSI
TWD71.00
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. 923-7598
Mfr. Part No.DS1225AD-200+
BrandMaxim
TWD556.30
Each (In a Tube of 12)
units
64kbit 8K x 8 bit 8K 8bit 200ns 13bit - Yes Asynchronous Through Hole EDIP 28 39.37 x 18.8 x 9.35mm 9.35mm
RS Stock No. 785-8691
Mfr. Part No.DS1225AD-200+
BrandMaxim
TWD601.00
Each
units
64kbit 8K x 8 bit 8K 8bit 200ns 13bit - Yes Asynchronous Through Hole EDIP 28 39.37 x 18.8 x 9.35mm 9.35mm
RS Stock No. 170-2057
Mfr. Part No.IS62C1024AL-35TLI
BrandISSI
TWD73.70
Each (In a Tray of 156)
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
TWD73.00
Each (In a Pack of 3)
units
1Mbit 64k x 16 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
TWD78.20
Each (In a Tray of 135)
units
1Mbit 64k x 16 64k 16bit 12ns 16bit - - - 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
TWD643.40
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
RS Stock No. 811-5175
Mfr. Part No.IS61WV102416BLL-10TLI
BrandISSI
TWD716.00
Each
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
RS Stock No. 124-2948
Mfr. Part No.CY7C1019DV33-10ZSXI
TWD98.00
Each (In a Pack of 2)
units
1Mbit 128K x 8 bit 128K 8bit 10ns 8bit 100MHz Yes Asynchronous Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS Stock No. 391-707
Mfr. Part No.IS61LV25616AL-10TLI
BrandISSI
TWD152.00
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. 170-2053
Mfr. Part No.IS61LV25616AL-10TLI
BrandISSI
TWD165.20
Each (In a Tray of 135)
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. 170-0735
Mfr. Part No.AS6C62256-55SIN
TWD63.40
Each (In a Tube of 25)
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. 811-5163
Mfr. Part No.IS61C6416AL-12KLI
BrandISSI
TWD66.80
Each (In a Pack of 4)
units
1Mbit 64k x 16 64k 16bit 12ns 16bit - - - Surface Mount SOJ 44 28.7 x 10.29 x 3.11mm 3.11mm
RS Stock No. 714-4801
Mfr. Part No.IDT70V28L20PFGI
BrandIDT
TWD2,245.00
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. 769-7342
Mfr. Part No.23LC1024-I/SN
BrandMicrochip
TWD67.00
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. 666-8150
Mfr. Part No.23K640-I/SN
BrandMicrochip
TWD21.40
Each (In a Pack of 5)
units
64kbit 8192 words x 8 bit 8K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm