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. 171-0986
Mfr. Part No.CY7C1011DV33-10ZSXI
MYR14.462
Each (In a Tray of 270)
units
2Mbit 128k x 16 bit 128k 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 177-5518
Mfr. Part No.AS6C1008-55SIN
MYR8.34
Each (In a Tube of 22)
units
1Mbit 128k x 8 bit 128k 8bit 55ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 188-5340
Mfr. Part No.CY7C199D-10VXI
MYR9.158
Each (In a Tube of 27)
units
256kbit 32k x 8 bit 32k 8bit 10ns 8bit 100MHz - - Surface Mount TSOP 28 11.9 x 8.1 x 1.15mm 1.15mm
New
RS Stock No. 194-8942
Mfr. Part No.CY7C1360C-166AXI
MYR68.75
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 217-3695
Mfr. Part No.71V424S10YG
MYR19.52
Each (In a Pack of 2)
units
4Mbit 512K x 8 512K 8bit 10ns - - - - - - - - -
New
RS Stock No. 217-3668
Mfr. Part No.71024S15TYG
MYR10.982
Each (In a Tube of 23)
units
1024kbit 128K x 8 128K 8bit 15ns - - - - - - - - -
New
RS Stock No. 215-5864
Mfr. Part No.47L64-I/SN
BrandMicrochip
MYR3.993
Each (In a Tube of 100)
units
64kbit 8k x 8 bit - - - - - - - - - - - -
RS Stock No. 182-3377
Mfr. Part No.CY7C1041GN30-10BVXI
MYR22.335
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 182-3295
Mfr. Part No.CY7C1049GN-10VXI
MYR23.063
Each (In a Tube of 19)
units
4Mbit 512k x 16 bit 512k 8bit 10ns - 100MHz - Asynchronous Surface Mount SOJ 36 0.93 x 0.4 x 0.12mm 0.12mm
New
RS Stock No. 194-8886
Mfr. Part No.CY62167ELL-45ZXI
MYR74.41
Each
units
- - - - - - - - - - - - - -
RS Stock No. 742-6724
Mfr. Part No.IDT71V416S10PHGI
BrandIDT
MYR28.92
Each
units
4Mbit 256K x 16 bit 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
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
New
RS Stock No. 217-3692
Mfr. Part No.71V416S15PHG
MYR16.587
Each (In a Tube of 26)
units
4Mbit 256K x 16 256K 16bit 15ns - - - - - - - - -
RS Stock No. 391-713
Mfr. Part No.IS61C256AL-12TLI
BrandISSI
MYR5.223
Each (In a Pack of 4)
units
256kbit 32K words x 8 bit 32k 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8.1 x 11.9 x 1mm 1mm
RS Stock No. 188-5337
Mfr. Part No.CY7C1051DV33-10ZSXI
MYR612.00
Each (In a Tray of 135)
units
8Mbit 512k x 16 bit 512k 16bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
New
RS Stock No. 194-8870
Mfr. Part No.CY62146EV30LL-45BVXI
$288.00
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 171-0980
Mfr. Part No.CY62167DV30LL-55ZXI
$915.00
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. 744-4527
Mfr. Part No.U62256AS2C07LLG1
$459.00
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. 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
- - - - - - - - - - - - - -