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
New
RS Stock No. 194-8890
Mfr. Part No.CY62168EV30LL-45BVXI
MYR54.53
Each
units
- - - - - - - - - - - - - -
RS Stock No. 811-5194
Mfr. Part No.IS61WV5128BLL-10TLI
BrandISSI
MYR18.99
Each (In a Pack of 2)
units
4Mbit 512k x 8 bit 512k 8bit 10ns 19bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 170-0741
Mfr. Part No.AS7C34098A-12JIN
MYR20.72
Each (In a Tube of 16)
units
4Mbit 256k 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. 194-8880
Mfr. Part No.CY62157EV30LL-45BVI
MYR34.71
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 181-7573
Mfr. Part No.CY62128EV30LL-45ZXI
MYR9.565
Each (In a Pack of 4)
units
1Mbit 128k x 8 bit 128k 8bit 45ns 8bit - Yes - Surface Mount TSOP 32 18.3 x 8.2 x 1.05mm 1.05mm
RS Stock No. 811-5223
Mfr. Part No.IS62WV51216BLL-55TLI
BrandISSI
MYR30.16
Each
units
8Mbit 512k x 16 bit 512k 16bit 55ns 19bit - Yes - Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS Stock No. 797-9417
Mfr. Part No.DS1250Y-70IND+
MYR365.73
Each
units
4096kbit 512k x 8 bit 512k 8bit 70ns 8bit - Yes - Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 10.92mm
New
RS Stock No. 194-8867
Mfr. Part No.CY62146ESL-45ZSXI
MYR32.602
Each (In a Tray of 135)
units
- - - - - - - - - - - - - -
RS Stock No. 198-7989
Mfr. Part No.CY62128ELL-45ZXIT
MYR8.279
Each (On a Reel of 1500)
units
1024kbit 128k x 8 bit 128k 8bit 45ns - - - - - - - - -
RS Stock No. 170-0739
Mfr. Part No.AS6C4008-55TIN
MYR14.712
Each (In a Tray of 156)
units
4Mbit 512k x 8 bit 512k 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
New
RS Stock No. 194-8971
Mfr. Part No.CY7C1470BV33-167AXI
MYR983.708
Each (In a Tray of 72)
units
- - - - - - - - - - - - - -
RS Stock No. 146-8939
Mfr. Part No.47L04-I/SN
BrandMicrochip
MYR2.803
Each (In a Pack of 10)
units
4kbit 512k x 8 bit 512k 8bit - - 1000kHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 194-8914
Mfr. Part No.CY7C1021DV33-10VXI
MYR12.742
Each (In a Pack of 5)
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. 178-4005
Mfr. Part No.23K640-I/SN
BrandMicrochip
MYR2.851
Each (In a Tube of 100)
units
64kbit 8192 x 8 bit 8k 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 797-5881
Mfr. Part No.AS7C38098A-10TIN
MYR64.49
Each
units
8Mbit 512K x 16 bit 512k 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 44 18.618 x 10.363 x 1.05mm 1.05mm
RS Stock No. 797-9398
Mfr. Part No.DS1245AB-100+
MYR119.59
Each
units
1024kbit 128k x 8 bit 128k 8bit 70ns 8bit - Yes - Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 10.92mm
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 - - - - - - - - -
RS Stock No. 538-237
Mfr. Part No.AS7C1024C-12JIN
MYR17.855
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 10.29 x 2.92mm 2.92mm
RS Stock No. 181-7606
Mfr. Part No.CY7C1049GN30-10ZSXI
MYR25.20
Each (In a Pack of 2)
units
4Mbit 512k x 8 bit 512k 8bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 538-215
Mfr. Part No.AS7C34096A-12TIN
MYR28.22
Each
units
4Mbit 512K words x 8 bit 512k 8bit 12ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm