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. 538-160
Mfr. Part No.AS6C4008-55SIN
MYR18.34
Each
units
4Mbit 512K words x 8 bit 512k 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 198-7995
Mfr. Part No.CY62128EV30LL-45ZAXIT
MYR8.09
Each (In a Pack of 5)
units
1024kbit 128k x 8 bit 128k 8bit 45ns - - - - - - - - -
New
RS Stock No. 194-8909
Mfr. Part No.CY7C1021CV33-10ZSXA
MYR22.341
Each (In a Tray of 135)
units
- - - - - - - - - - - - - -
RS Stock No. 181-8242
Mfr. Part No.CY62128ELL-45SXIT
MYR9.615
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
New
RS Stock No. 194-8895
Mfr. Part No.CY7C1010DV33-10ZSXI
MYR19.217
Each (In a Tray of 135)
units
- - - - - - - - - - - - - -
New
RS Stock No. 215-5866
Mfr. Part No.47L64-I/SN
BrandMicrochip
MYR3.91
Each (In a Pack of 10)
units
64kbit 8k x 8 bit - - - - - - - - - - - -
New
RS Stock No. 194-8923
Mfr. Part No.CY7C1061G30-10ZSXI
MYR232.033
Each (In a Tray of 108)
units
- - - - - - - - - - - - - -
RS Stock No. 193-8459
Mfr. Part No.CY62256NLL-55ZXIT
MYR7.74
Each (In a Pack of 5)
units
256kbit 32k x 8 bit 32k 8bit 55ns 8bit 1MHz Yes Asynchronous Surface Mount TSOP I 28 11.9 x 8.1 x 1mm 1mm
RS Stock No. 189-7457
Mfr. Part No.DS1220AD-150+
MYR76.021
Each (In a Tube of 14)
units
16kbit 2k x 8 bit 2k 8bit 100ns 8bit - Yes - Through Hole EDIP 24 38.1 x 18.29 x 10.67mm 10.67mm
RS Stock No. 170-0892
Mfr. Part No.AS7C1026B-12TCN
MYR10.738
Each (In a Tray of 135)
units
1Mbit 64k x 16 bit 64k 16bit 12ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS Stock No. 170-2176
Mfr. Part No.IS61C25616AL-10TLI
BrandISSI
MYR19.583
Each (In a Tray of 135)
units
4Mbit 256k x 16 bit 256k 16bit 10ns 18bit - - - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
New
RS Stock No. 217-3684
Mfr. Part No.71V416L15PHGI
MYR17.99
Each (In a Tube of 26)
units
4Mbit 256K x 16 256K 16bit 15ns - - - - - - - - -
RS Stock No. 538-170
Mfr. Part No.AS6C1008-55SIN
MYR10.68
Each (In a Pack of 2)
units
1Mbit 128K words 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. 797-5857
Mfr. Part No.AS6C1616-55TIN
MYR47.02
Each
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. 198-8000
Mfr. Part No.CY62157EV30LL-45ZSXIT
MYR31.046
Each (On a Reel of 1000)
units
8192kbit 512k x 16 bit 512k 16bit 45ns - - - - - - - - -
New
RS Stock No. 194-8903
Mfr. Part No.CY7C1019DV33-10BVXI
MYR14.107
Each (In a Tray of 480)
units
- - - - - - - - - - - - - -
New
RS Stock No. 217-3645
Mfr. Part No.7024L15PFG
MYR144.77
Each
units
64kbit 4Kx 16 4K 16bit 15ns - - - - - - - - -
RS Stock No. 198-8001
Mfr. Part No.CY62157EV30LL-45ZSXIT
MYR43.67
Each
units
8192kbit 512k x 16 bit 512k 16bit 45ns - - - - - - - - -
RS Stock No. 823-4447
Mfr. Part No.23K256-E/SN
BrandMicrochip
MYR5.606
Each (In a Pack of 5)
units
256kbit 32768 x 8 bit 32768 8bit 50ns 16bit 20MHz - Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 171-0962
Mfr. Part No.CY14B104NA-ZS25XI
MYR128.799
Each (In a Tray of 135)
units
4Mbit 256k x 16 bit, 512k x 8 bit 256 k, 512k 8 bit, 16bit 25ns 8 bit, 16 bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm