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. 170-0895
Mfr. Part No.AS6C4008-55PCN
MYR18.092
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
RS Stock No. 170-0920
Mfr. Part No.AS6C1616-55TIN
MYR36.965
Each (In a Tray of 135)
units
16Mbit 1024K x 16 bit 1024K 16bit 55ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS Stock No. 125-7514
Mfr. Part No.CY62167DV30LL-55ZXI
MYR80.04
Each
units
16Mbit 1M x 16 bit 1M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 181-7452
Mfr. Part No.CY7C1062G30-10BGXI
MYR170.506
Each (In a Tray of 84)
units
16Mbit 512K x 32 bit 512K 32bit 10ns - - - Asynchronous Surface Mount PBGA 119 22 x 14 x 1.8mm 1.8mm
RS Stock No. 170-0921
Mfr. Part No.AS7C316098A-10BIN
MYR134.464
Each (In a Tray of 480)
units
16Mbit 1024K x 16 bit 1024K 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TFBGA 48 6.05 x 8.05 x 1.05mm 1.05mm
RS Stock No. 178-4109
Mfr. Part No.23K256-E/ST
BrandMicrochip
MYR4.682
Each (In a Tube of 100)
units
256kbit 32768 x 8 bit 32768 8bit 50ns 16bit 20MHz - Synchronous Surface Mount TSSOP 8 4.5 x 3.1 x 1.05mm 1.05mm
New
RS Stock No. 200-9830
Mfr. Part No.48LM01-I/SM
BrandMicrochip
MYR15.893
Each (In a Tube of 90)
units
1Mbit 128k x 8 1, 31, 072 8bit 10ns - - - - - - - - -
RS Stock No. 170-2184
Mfr. Part No.IS61WV25616BLL-10BLI
BrandISSI
MYR18.688
Each (In a Tray of 480)
units
4Mbit 256k x 16 256k 16bit 10ns 18bit - - Asynchronous Surface Mount TFBGA 48 8.1 x 6.1 x 0.9mm 0.9mm
RS Stock No. 125-7526
Mfr. Part No.CY7C1009D-10VXI
MYR10.425
Each (In a Pack of 2)
units
1Mbit 128K x 8 bit 128K 8bit 10ns - - Yes - Surface Mount SOJ 32 21.08 x 7.75 x 2.92mm 2.92mm
RS Stock No. 171-0977
Mfr. Part No.CY62157EV30LL-45ZSXI
MYR27.08
Each (In a Tray of 270)
units
8Mbit 512K x 16 bit 512K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 182-3336
Mfr. Part No.CY7C1021DV33-10BVXI
MYR12.733
Each (In a Pack of 3)
units
- - - - - - - - - - - - - -
RS Stock No. 182-3386
Mfr. Part No.CY7C1049GN-10VXI
MYR25.20
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 126-6983
Mfr. Part No.RMLV0816BGSB-4S2#AA0
MYR138.87
Each
units
8Mbit 512K words x 16 bit 512K 16bit 45ns 19bit - Yes - Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 181-8242
Mfr. Part No.CY62128ELL-45SXIT
MYR7.847
Each (On a Reel of 1000)
units
1Mbit 128K x 8 bit 128K 8bit 45ns 8bit - Yes Asynchronous Surface Mount SOIC 32 20.75 x 11.43 x 2.81mm 2.81mm
RS Stock No. 538-249
Mfr. Part No.AS7C4098A-12TIN
MYR22.41
Each
units
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 178-4051
Mfr. Part No.23LCV1024-I/ST
BrandMicrochip
MYR9.608
Each (In a Tube of 100)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 125-6975
Mfr. Part No.CY62137EV30LL-45ZSXI
MYR12.63
Each (In a Pack of 2)
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. 188-5322
Mfr. Part No.CY62146EV30LL-45ZSXI
MYR20.977
Each (In a Tray of 135)
units
4Mbit 512k x 8 bit 512k 8bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 125-7535
Mfr. Part No.CY7C1051DV33-10ZSXI
MYR58.41
Each
units
8Mbit 512K x 16 bit 512K 16bit 10ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
New
RS Stock No. 200-9833
Mfr. Part No.48L512-I/SN
BrandMicrochip
MYR12.517
Each (In a Pack of 3)
units
512kbit 65 k x 8 65, 536 8bit 10ns - - - - - - - - -
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