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. 785-8691
Mfr. Part No.DS1225AD-200+
SGD25.92
Each
units
64kbit 8K x 8 bit 8k 8bit 200ns 13bit - Yes Asynchronous Through Hole EDIP 28 39.37 x 18.8 x 9.35mm 9.35mm
RS Stock No. 797-9467
Mfr. Part No.DS1345YP-100+
SGD39.71
Each
units
1024kbit 128k x 8 bit 128k 8bit 70ns 8bit - - - Surface Mount Power Cap 34 0.995 x 0.93 x 0.032in 0.81mm
RS Stock No. 189-9239
Mfr. Part No.DS1245Y-70IND+
SGD52.28
Each
units
1Mbit 128k x 8 bit 128k 8bit 70ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 189-7468
Mfr. Part No.DS1245Y-100+
SGD48.856
Each (In a Tube of 11)
units
1Mbit 128k x 8 bit 128k 8bit 100ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 192-1555
Mfr. Part No.DS1220AD-200IND+
SGD27.17
Each
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. 189-7456
Mfr. Part No.DS1220AD-100IND+
SGD24.939
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. 189-9153
Mfr. Part No.DS1220AD-150+
SGD27.12
Each
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. 192-1229
Mfr. Part No.DS1250Y-70IND+
SGD151.935
Each (In a Tube of 11)
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
RS Stock No. 192-1603
Mfr. Part No.DS1225AB-85+
SGD30.71
Each
units
64kbit 8k x 8 bit 8k 8bit 85ns 8bit - Yes - Through Hole EDIP 28 39.37 x 18.29 x 10.67mm 10.67mm
RS Stock No. 797-9417
Mfr. Part No.DS1250Y-70IND+
SGD137.43
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
RS Stock No. 189-9175
Mfr. Part No.DS1245Y-100+
SGD49.37
Each
units
1Mbit 128k x 8 bit 128k 8bit 100ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 189-7471
Mfr. Part No.DS1245Y-70IND+
SGD49.172
Each (In a Tube of 11)
units
1Mbit 128k x 8 bit 128k 8bit 70ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 192-1649
Mfr. Part No.DS1250Y-70+
SGD164.78
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
RS Stock No. 923-7756
Mfr. Part No.DS1245AB-100+
SGD46.421
Each (In a Tube of 11)
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. 189-7465
Mfr. Part No.DS1230Y-70IND+
SGD45.181
Each (In a Tube of 12)
units
256kbit 32k x 8 bit 32k 8bit 70ns 15bit - Yes - Through Hole EDIP 28 39.37 x 18.8 x 10.67mm 10.67mm
RS Stock No. 189-7457
Mfr. Part No.DS1220AD-150+
SGD26.844
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. 192-1214
Mfr. Part No.DS1225AB-200+
SGD30.129
Each (In a Tube of 12)
units
64kbit 8k x 8 bit 8k 8bit 70ns 8bit - Yes - Through Hole EDIP 28 39.37 x 18.29 x 10.67mm 10.67mm
RS Stock No. 192-1574
Mfr. Part No.DS1245AB-120+
SGD56.09
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. 192-1215
Mfr. Part No.DS1225AB-85+
SGD32.295
Each (In a Tube of 12)
units
64kbit 8k x 8 bit 8k 8bit 70ns 8bit - Yes - Through Hole EDIP 28 39.37 x 18.29 x 10.67mm 10.67mm
RS Stock No. 797-9398
Mfr. Part No.DS1245AB-100+
SGD44.94
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