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

  • 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

Applications

  • Computers
  • Workstations
  • Routers
  • LCD screens and printers
  • Electronics
  • Microprocessors

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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. 170-2047
Mfr. Part No.IS62C256AL-45ULI
BrandISSI
MYR5.249
Each (In a Tray of 120)
units
256kbit 32k x 8 bit 32k 8bit 45ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.24 x 8.53 x 2.84mm 2.84mm
RS Stock No. 146-0606
Mfr. Part No.AS7C38096A-10TIN
MYR61.101
Each (In a Tray of 135)
units
8Mbit 1M x 8 bit 1M 8bit 10ns 8bit 1MHz Yes Asynchronous Surface Mount TSOP 44 18.618 x 10.363 x 1.05mm 1.05mm
RS Stock No. 125-7519
Mfr. Part No.CY62187EV30LL-55BAXI
MYR319.06
Each
units
64Mbit 4M x 16 bit 4M 16bit 55ns 16bit - Yes - Surface Mount VFBGA 48 8 x 9.5 x 1.2mm 1.2mm
RS Stock No. 193-8453
Mfr. Part No.CY62126EV30LL-45ZSXIT
MYR10.72
Each (In a Pack of 5)
units
1Mbit 64k x 16 bit 64k 16bit 45ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP II 44 18.517 x 10.262 x 1.044mm 1.04mm
RS Stock No. 194-8913
Mfr. Part No.CY7C1021DV33-10VXI
MYR11.331
Each (In a Tube of 17)
units
1Mbit 64k x 16 bit 64k 16bit 10ns 16bit 1MHz - Asynchronous Surface Mount SOJ 44 1.13 x 0.405 x 0.12in 3.05mm
RS Stock No. 391-731
Mfr. Part No.IS61C1024AL-12JLI
BrandISSI
MYR13.07
Each (In a Pack of 2)
units
1Mbit 128K words 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. 125-7535
Mfr. Part No.CY7C1051DV33-10ZSXI
MYR138.68
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. 194-8973
Mfr. Part No.CY7C1514KV18-250BZI
MYR904.444
Each (In a Tray of 136)
units
- - - - - - - - - - - - - -
New
RS Stock No. 194-8968
Mfr. Part No.CY7C1441KV33-133AXI
MYR333.65
Each
units
- - - - - - - - - - - - - -
RS Stock No. 171-0980
Mfr. Part No.CY62167DV30LL-55ZXI
MYR73.585
Each (In a Tray of 192)
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. 803-2197
Mfr. Part No.23LCV512-I/SN
BrandMicrochip
MYR7.982
Each (In a Pack of 5)
units
512kbit 64k x 8 bit 64k 8bit 5ns 16bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
New
RS Stock No. 217-3690
Mfr. Part No.71V416S15PHGI
MYR17.99
Each (In a Tube of 26)
units
4Mbit 256K x 16 256K 16bit 15ns - - - - - - - - -
RS Stock No. 200-9838
Mfr. Part No.48L640-I/SN
BrandMicrochip
MYR4.058
Each (In a Pack of 10)
units
64kbit 8k x 8 bit 8k 8bit 10ns - - - - - - - - -
RS Stock No. 538-209
Mfr. Part No.AS7C4098A-12JIN
MYR22.41
Each
units
4Mbit 256K words x 16 bit 256k 16bit 12ns 18bit - Yes Asynchronous Surface Mount SOJ 44 28.7 x 10.29 x 2.92mm 2.92mm
New
RS Stock No. 194-8948
Mfr. Part No.CY7C1370KV33-167AXI
MYR164.53
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 217-3672
Mfr. Part No.7130LA20JG
MYR60.218
Each (In a Tube of 24)
units
8kbit 1K x 8 1K 8bit 20ns - - - - - - - - -
RS Stock No. 146-8933
Mfr. Part No.47L04-I/P
BrandMicrochip
MYR3.742
Each (In a Pack of 10)
units
4kbit 512k x 8 bit 512k 8bit - - 1000kHz Yes Synchronous Through Hole DIP 8 10.2 x 7.1 x 4.83mm 4.83mm
RS Stock No. 193-8468
Mfr. Part No.CY7C1049G30-10VXI
MYR27.13
Each (In a Pack of 2)
units
4Mbit 512k x 8 bit 512k 8bit 10ns 8bit 100MHz - Asynchronous Through Hole SOJ 36 0.92 x 0.395 x 0.103in 2.62mm
New
RS Stock No. 217-3673
Mfr. Part No.7130LA20JG
MYR65.68
Each
units
8kbit 1K x 8 1K 8bit 20ns - - - - - - - - -
New
RS Stock No. 217-3674
Mfr. Part No.7130LA25JGI8
MYR50.246
Each (On a Reel of 400)
units
8kbit 1K x 8 1K 8bit 25ns - - - - - - - - -