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. 666-8148
Mfr. Part No.23K256-I/SN
BrandMicrochip
£0.842
Each (In a Pack of 5)
Units
256kbit 32768 x 8 bit 32k 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 889-5648
Mfr. Part No.23K256-I/SN
BrandMicrochip
£0.803
Each (In a Tube of 100)
Units
256kbit 32768 x 8 bit 32k 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 798-5208
Mfr. Part No.23LC512-I/SN
BrandMicrochip
£1.14
Each (In a Pack of 5)
Units
512kbit 64k x 8 bit 64k 8bit 5ns 8bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 124-2947
Mfr. Part No.CY62167EV30LL-45BVXI
£8.05
Each
Units
16Mbit 1M x 16 bit, 2M x 8 bit 1M, 2M 8 bit, 16bit 45ns 8 bit, 16 bit 1MHz Yes - Surface Mount VFBGA 48 6 x 8 x 0.79mm 0.79mm
RS Stock No. 178-4953
Mfr. Part No.23LCV512-I/P
BrandMicrochip
£1.30
Each (In a Tube of 60)
Units
512kbit 64k x 8 bit 64k 8bit 5ns 16bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 188-5330
Mfr. Part No.CY62167EV30LL-45BVXI
£6.195
Each (In a Tray of 480)
Units
16Mbit 2M x 8 bit 2M 8bit 45ns 16bit 1MHz Yes - Surface Mount VFBGA 48 8 x 6 x 0.55mm 0.55mm
RS Stock No. 177-5533
Mfr. Part No.AS6C1008-55TIN
£1.372
Each (In a Tray of 156)
Units
1Mbit 128k x 8 bit 128k 8bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS Stock No. 125-6979
Mfr. Part No.CY62138FV30LL-45ZAXI
£3.335
Each (In a Pack of 2)
Units
2Mbit 256k x 8 bit 256k 8bit 45ns 8bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 803-2184
Mfr. Part No.23LCV512-I/P
BrandMicrochip
£1.34
Each (In a Pack of 5)
Units
512kbit 64k x 8 bit 64k 8bit 5ns 16bit 20MHz Yes - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 538-176
Mfr. Part No.AS6C1008-55TIN
£1.775
Each (In a Pack of 2)
Units
1Mbit 128k x 8 bit 128k 8bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS Stock No. 178-4043
Mfr. Part No.23LC512-I/SN
BrandMicrochip
£1.06
Each (In a Tube of 100)
Units
512kbit 64k x 8 bit 64k 8bit 5ns 8bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 171-0973
Mfr. Part No.CY62138FV30LL-45ZAXI
£2.959
Each (In a Tray of 468)
Units
2Mbit 256k x 8 bit 256k 8bit 45ns 8bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 666-8144
Mfr. Part No.23K256-I/P
BrandMicrochip
£0.886
Each (In a Pack of 5)
Units
256kbit 32768 x 8 bit 32k 8bit 25ns 16bit 20MHz Yes Synchronous Through Hole PDIP 8 9.27 x 6.35 x 3.3mm 3.3mm
RS Stock No. 742-4692
Mfr. Part No.IDT6116LA25SOGI
BrandIDT
£3.92
Each
Units
16kbit 2k x 8 bit 2k 8bit 25ns 11bit - Yes Asynchronous Surface Mount SOIC 24 15.4 x 7.6 x 2.34mm 2.34mm
RS Stock No. 178-4114
Mfr. Part No.23LC512-I/ST
BrandMicrochip
£1.08
Each (In a Tube of 100)
Units
512kbit 64k x 8 bit 64k 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 823-4532
Mfr. Part No.23LC512-I/ST
BrandMicrochip
£1.17
Each (In a Pack of 5)
Units
512kbit 64k x 8 bit 64k 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 178-4938
Mfr. Part No.23K256-I/P
BrandMicrochip
£0.832
Each (In a Tube of 60)
Units
256kbit 32768 x 8 bit 32k 8bit 25ns 16bit 20MHz Yes Synchronous Through Hole PDIP 8 9.27 x 6.35 x 3.3mm 3.3mm
RS Stock No. 124-2937
Mfr. Part No.CY62128EV30LL-45ZAXI
£1.51
Each (In a Pack of 5)
Units
1Mbit 128k x 8 bit 128k 8bit 45ns 8bit 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 188-5320
Mfr. Part No.CY62128EV30LL-45ZAXI
£1.395
Each (In a Tray of 234)
Units
1Mbit 128k x 8 bit 128k 8bit 45ns - 1MHz Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS Stock No. 124-2945
Mfr. Part No.CY62158ELL-45ZSXI
£9.24
Each
Units
8Mbit 1M x 8 bit 1M 8bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm