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. 538-148
Mfr. Part No.AS6C62256-55PCN
£2.04
Each (In a Pack of 2)
Units
256kbit 32k x 8 bit 32k 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 170-0736
Mfr. Part No.AS6C62256-55PCN
£1.775
Each (In a Tube of 15)
Units
256kbit 32k x 8 bit 32k 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 744-4561
Mfr. Part No.AS6C4008-55PCN
£4.04
Each
Units
4Mbit 512k x 8 bit 512k 8bit 55ns 19bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 170-0895
Mfr. Part No.AS6C4008-55PCN
£3.549
Each (In a Tube of 13)
Units
4Mbit 512k x 8 bit 512k 8bit 55ns 19bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 177-5513
Mfr. Part No.AS6C6264-55PCN
£1.857
Each (In a Tube of 15)
Units
64kbit 8k x 8 bit 8k 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 538-158
Mfr. Part No.AS6C6264-55PCN
£2.07
Each (In a Pack of 2)
Units
64kbit 8k x 8 bit 8k 8bit 55ns 13bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 170-0891
Mfr. Part No.AS6C1008-55PCN
£2.03
Each (In a Tube of 13)
Units
1Mbit 128k x 8 bit 128k 8bit 55ns 17bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 744-4542
Mfr. Part No.AS6C1008-55PCN
£2.32
Each
Units
1Mbit 128k x 8 bit 128k 8bit 55ns 17bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 538-160
Mfr. Part No.AS6C4008-55SIN
£3.50
Each
Units
4Mbit 512k x 8 bit 512k 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 170-0738
Mfr. Part No.AS6C4008-55SIN
£3.08
Each (In a Tube of 22)
Units
4Mbit 512k x 8 bit 512k 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 538-142
Mfr. Part No.AS6C62256-55SIN
£1.57
Each (In a Pack of 2)
Units
256kbit 32k x 8 bit 32k 8bit 55ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 170-0735
Mfr. Part No.AS6C62256-55SIN
£1.398
Each (In a Tube of 25)
Units
256kbit 32k x 8 bit 32k 8bit 55ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 538-154
Mfr. Part No.AS6C8008-55ZIN
£5.38
Each
Units
8Mbit 1024k x 8 bit 1M 8bit 55ns 20bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
RS Stock No. 177-5518
Mfr. Part No.AS6C1008-55SIN
£1.591
Each (In a Tube of 22)
Units
1Mbit 128k x 8 bit 128k 8bit 55ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 538-170
Mfr. Part No.AS6C1008-55SIN
£1.745
Each (In a Pack of 2)
Units
1Mbit 128k x 8 bit 128k 8bit 55ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 170-0737
Mfr. Part No.AS6C8008-55ZIN
£4.59
Each (In a Tray of 135)
Units
8Mbit 1024k x 8 bit 1M 8bit 55ns 20bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
RS Stock No. 170-0752
Mfr. Part No.AS6C8016-55ZIN
£4.549
Each (In a Tray of 135)
Units
8Mbit 512k x 16 bit 512k 16bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
RS Stock No. 538-271
Mfr. Part No.AS6C8016-55ZIN
£5.64
Each
Units
8Mbit 512k x 16 bit 512k 16bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
RS Stock No. 170-0740
Mfr. Part No.AS6C6264-55SIN
£1.602
Each (In a Tube of 25)
Units
64kbit 8k x 8 bit 8k 8bit 55ns 13bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS Stock No. 538-186
Mfr. Part No.AS6C6264-55SIN
£1.805
Each (In a Pack of 2)
Units
64kbit 8k x 8 bit 8k 8bit 55ns 13bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm