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 include:
• 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
• Simplicity
• Faster – quick and easy to control
• Used as cache memory
• Large size
• Price – expensive as it uses more chips than DRAM for the same amount of storage space
• High power Consumption
• Reliability
Disadvantages include:
• Capacity
• Varying power consumption
Can be found in the following:
• Computers
• Workstations
• Routers
• LCD screens and printers
• Electronics
• Microprocessor

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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. 189-9239
Mfr. Part No.DS1245Y-70IND+
€28.41
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. 797-9414
Mfr. Part No.DS1250Y-70+
€54.18
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. 797-9398
Mfr. Part No.DS1245AB-100+
€26.87
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. 923-7611
Mfr. Part No.DS1245Y-100+
€25.713
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. 923-7598
Mfr. Part No.DS1225AD-200+
€14.585
Each (In a Tube of 12)
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. 923-7747
Mfr. Part No.DS1225AB-85+
€14.079
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. 165-9423
Mfr. Part No.DS1220AD-100IND+
€10.806
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. 189-7468
Mfr. Part No.DS1245Y-100+
€25.713
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. 189-9175
Mfr. Part No.DS1245Y-100+
€28.28
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. 799-2717
Mfr. Part No.DS1230Y-70IND+
€21.54
Each
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. 165-9424
Mfr. Part No.DS1220AD-200IND+
€11.725
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. 797-9366
Mfr. Part No.DS1220AD-150+
€12.90
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. 797-9467
Mfr. Part No.DS1345YP-100+
€14.18
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. 797-9360
Mfr. Part No.DS1220AD-200IND+
€12.90
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. 797-9417
Mfr. Part No.DS1250Y-70IND+
€80.27
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. 797-9354
Mfr. Part No.DS1220AD-100IND+
€11.89
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. 797-9379
Mfr. Part No.DS1225AB-200+
€15.60
Each
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+
€27.26
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. 165-9425
Mfr. Part No.DS1220AD-150+
€11.725
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. 785-8691
Mfr. Part No.DS1225AD-200+
€16.04
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