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. 146-3212
Mfr. Part No.47L04-I/SN
BrandMicrochip
MYR2.803
Each (In a Tube of 100)
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. 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. 182-3377
Mfr. Part No.CY7C1041GN30-10BVXI
MYR17.095
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS Stock No. 125-7513
Mfr. Part No.CY62157EV30LL-55ZSXE
MYR51.98
Each
units
8Mbit 512K x 16 bit 512k 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
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. 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. 193-8452
Mfr. Part No.CY62126EV30LL-45ZSXIT
MYR7.924
Each (On a Reel of 1000)
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
New
RS Stock No. 194-8924
Mfr. Part No.CY7C1061G30-10ZSXI
MYR257.75
Each
units
- - - - - - - - - - - - - -
New
RS Stock No. 217-7890
Mfr. Part No.7130LA35PDG
MYR51.02
Each
units
16kbit 1K X 8 2K 16bit 100ns - - - - - - - - -
New
RS Stock No. 194-8965
Mfr. Part No.CY7C1440KV33-250AXC
MYR400.516
Each (In a Tray of 72)
units
- - - - - - - - - - - - - -
RS Stock No. 146-3206
Mfr. Part No.47C04-I/SN
BrandMicrochip
MYR2.803
Each (In a Tube of 100)
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. 170-2069
Mfr. Part No.IDT7130LA25JGI
BrandIDT
MYR60.16
Each (In a Tube of 24)
units
8kbit 1k x 8 bit 1k 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 181-7441
Mfr. Part No.CY62147EV30LL-45ZSXI
MYR12.152
Each (In a Tray of 135)
units
4Mbit 256k x 16 bit 256k 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 181-7451
Mfr. Part No.CY7C1061GE30-10ZSXI
MYR132.379
Each (In a Tray of 108)
units
16Mbit 1M x 16 bit 1M 16bit 10ns - - - Asynchronous Surface Mount TSOP 54 22.51 x 10.26 x 1.05mm 1.05mm
New
RS Stock No. 194-8967
Mfr. Part No.CY7C1441KV33-133AXI
MYR300.313
Each (In a Tray of 72)
units
- - - - - - - - - - - - - -
RS Stock No. 125-7532
Mfr. Part No.CY7C1021CV33-12ZSXE
MYR21.785
Each (In a Pack of 2)
units
1Mbit 64K x 16 bit 64k 16bit 12ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
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. 198-7999
Mfr. Part No.CY62148EV30LL-45ZSXIT
MYR23.02
Each (In a Pack of 2)
units
4096kbit 512k x 8 bit 512k 8bit 45ns - - - - - - - - -
RS Stock No. 181-8272
Mfr. Part No.CY14E256LA-SZ25XI
MYR77.90
Each (In a Tube of 22)
units
256kbit 32k x 8 bit 32k 8bit 25ns - - Yes - Surface Mount SOIC 32 20.87 x 7.59 x 2.29mm 2.29mm
RS Stock No. 392-362
Mfr. Part No.IS61LV6416-10TL
BrandISSI
MYR10.215
Each (In a Pack of 2)
units
1Mbit 64K words x 16 bit 64k 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm