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. 170-0895
Mfr. Part No.AS6C4008-55PCN
$8.264
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. 744-4561
Mfr. Part No.AS6C4008-55PCN
$8.94
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. 538-176
Mfr. Part No.AS6C1008-55TIN
$4.13
Each (In a Pack of 2)
units
1Mbit 128K words x 8 bit 128k 8bit 55ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS Stock No. 538-158
Mfr. Part No.AS6C6264-55PCN
$5.06
Each (In a Pack of 2)
units
64kbit 8K words 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. 177-5533
Mfr. Part No.AS6C1008-55TIN
$3.266
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. 102-3554
Mfr. Part No.M48Z58-70PC1
$21.89
Each (In a Tube of 12)
units
64kbit 8k x 8 bit 8k 8bit 70ns 13bit 1MHz Yes - Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 8.89mm
RS Stock No. 170-0891
Mfr. Part No.AS6C1008-55PCN
$4.904
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. 177-5513
Mfr. Part No.AS6C6264-55PCN
$4.557
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. 171-0982
Mfr. Part No.CY62167EV30LL-45ZXA
$18.456
Each (In a Tray of 96)
units
16Mbit 1M x 16 bit 1M 16bit 45ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 125-7516
Mfr. Part No.CY62167EV30LL-45ZXA
$23.35
Each
units
16Mbit 1M x 16 bit 1M 16bit 45ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 744-4542
Mfr. Part No.AS6C1008-55PCN
$5.17
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. 810-3576
Mfr. Part No.M48Z58-70PC1
$28.41
Each
units
64kbit 8k x 8 bit 8k 8bit 70ns 13bit 1MHz Yes - Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 8.89mm
RS Stock No. 188-5329
Mfr. Part No.CY62158EV30LL-45ZSXI
$10.13
Each (In a Tray of 135)
units
8Mbit 512k x 16 bit 512k 16bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 803-2181
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
$4.738
Each (In a Pack of 5)
units
1Mbit 128k x 8 bit 128k 8bit 5ns 24bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 171-0977
Mfr. Part No.CY62157EV30LL-45ZSXI
$12.477
Each (In a Tray of 270)
units
8Mbit 512k x 16 bit 512k 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 124-2944
Mfr. Part No.CY62157EV30LL-45ZXI
$19.03
Each
units
8Mbit 512k x 16 bit 512k 16bit 45ns 16bit 1MHz Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 125-6983
Mfr. Part No.CY62157EV30LL-45ZSXI
$13.16
Each
units
8Mbit 512K x 16 bit 512k 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 188-5327
Mfr. Part No.CY62157EV30LL-45ZXI
$17.131
Each (In a Tray of 96)
units
8Mbit 512k x 16 bit 512k 16bit 45ns - 1MHz Yes - Surface Mount TSOP 48 18.51 x 10.26 x 1.04mm 1.04mm
RS Stock No. 181-7582
Mfr. Part No.CY62147EV30LL-45ZSXI
$6.09
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. 170-2178
Mfr. Part No.IS61C5128AS-25QLI
BrandISSI
$6.57
Each (In a Tray of 84)
units
4Mbit 512k x 8 bit 512k 8bit 25ns 19bit - Yes - Surface Mount SOP 32 20.75 x 11.43 x 2.75mm 2.75mm