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. 194-8961
Mfr. Part No.CY7C1399BN-12ZXC
MYR10.191
Each (In a Tray of 234)
units
- - - - - - - - - - - - - -
RS Stock No. 198-8000
Mfr. Part No.CY62157EV30LL-45ZSXIT
MYR42.304
Each (On a Reel of 1000)
units
8192kbit 512k x 16 bit 512k 16bit 45ns - - - - - - - - -
New
RS Stock No. 217-7891
Mfr. Part No.71321SA55JG
MYR40.243
Each (In a Tube of 24)
units
32kbit 2K x 8 4K 16bit 55ns - - - - - - - - -
RS Stock No. 181-7582
Mfr. Part No.CY62147EV30LL-45ZSXI
MYR16.287
Each (In a Pack of 3)
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. 182-3289
Mfr. Part No.CY7C1021DV33-10BVXI
MYR15.33
Each (In a Tray of 480)
units
1Mbit 64k x 16 bit 64k 16bit 10ns - 100MHz Yes Asynchronous Surface Mount BGA 48 8 x 6 x 0.79mm 0.79mm
RS Stock No. 181-7613
Mfr. Part No.CY7C1061GE30-10ZSXI
MYR151.06
Each
units
16Mbit 1M x 16 bit 1M 16bit 10ns - - - Asynchronous Surface Mount TSOP 54 22.51 x 10.26 x 1.05mm 1.05mm
RS Stock No. 170-0888
Mfr. Part No.U62256AS2C07LLG1
MYR16.24
Each (In a Tube of 25)
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. 767-5963
Mfr. Part No.R1WV6416RBG-7SI#B0
MYR256.56
Each
units
64Mbit 4M words x 16 bit 4M 16bit 70ns - - Yes Asynchronous Surface Mount FBGA 48 8.5 x 11 x 0.8mm 0.8mm
RS Stock No. 146-3208
Mfr. Part No.47C16-I/P
BrandMicrochip
MYR4.122
Each (In a Tube of 60)
units
16kbit 2048k x 8 bit 2048k 8bit - - 1000kHz Yes Synchronous Through Hole DIP 8 10.2 x 7.1 x 4.83mm 4.83mm
New
RS Stock No. 194-8976
Mfr. Part No.CY7C199D-10ZXI
MYR16.104
Each (In a Pack of 5)
units
- - - - - - - - - - - - - -
RS Stock No. 666-8138
Mfr. Part No.23A256-I/SN
BrandMicrochip
MYR5.534
Each (In a Pack of 5)
units
256kbit 32768 words x 8 bit 32k 8bit 32ns 16bit 16MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 181-7448
Mfr. Part No.CY7C1041GN-10ZSXI
MYR18.881
Each (In a Tray of 135)
units
4Mbit 256k x 16 bit 256k 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
New
RS Stock No. 194-8975
Mfr. Part No.CY7C199D-10ZXI
MYR14.652
Each (In a Tray of 234)
units
- - - - - - - - - - - - - -