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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Beskrivning Pris 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-artikelnummer 181-8377
Tillv. art.nrCY14B101PA-SFXI
95,75 kr
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1Mbit 128K x 8 bit 128K 8bit - - 104MHz Yes Synchronous Surface Mount SOIC 16 10.49 x 7.59 x 2.36mm 2.36mm
RS-artikelnummer 666-8144
Tillv. art.nr23K256-I/P
VarumärkeMicrochip
10,858 kr
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256kbit 32768 words x 8 bit 32K 8bit 25ns 16bit 20MHz Yes Synchronous Through Hole PDIP 8 9.27 x 6.35 x 3.3mm 3.3mm
RS-artikelnummer 188-5318
Tillv. art.nrCY62128EV30LL-45SXA
39,462 kr
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1Mbit 128k x 8 bit 128k 8bit 45ns 8bit 1MHz Yes - Surface Mount SOIC 32 20.75 x 11.43 x 2.88mm 2.88mm
RS-artikelnummer 170-2057
Tillv. art.nrIS62C1024AL-35TLI
VarumärkeISSI
19,333 kr
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1Mbit 128K words x 8 bit 128K 8bit 35ns 17bit - Yes Asynchronous Surface Mount TSOP 32 8.1 x 18.5 x 0.95mm 0.95mm
RS-artikelnummer 811-5194
Tillv. art.nrIS61WV5128BLL-10TLI
VarumärkeISSI
36,395 kr
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4Mbit 512k x 8 512k 8bit 10ns 19bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS-artikelnummer 182-3288
Tillv. art.nrCY7C1019CV33-10ZXA
24,774 kr
Each (In a Tray of 117)
Enheter
1Mbit 128K x 8 bit 128K 8bit 10ns - 1MHz - - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm
RS-artikelnummer 193-8457
Tillv. art.nrCY621472E30LL-45ZSXI
55,11 kr
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4Mbit 256 k x 16 bit 256 k 16bit 45ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP II 44 18.517 x 10.262 x 1.044mm 1.04mm
RS-artikelnummer 182-3394
Tillv. art.nrCY7C1049GN30-10VXI
45,03 kr
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- - - - - - - - - - - - - -
RS-artikelnummer 125-7517
Tillv. art.nrCY62167EV30LL-45ZXI
160,99 kr
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16Mbit 1M x 16 bit 1M 16bit 45ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS-artikelnummer 391-696
Tillv. art.nrIS61LV5128AL-10TLI
VarumärkeISSI
43,74 kr
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Enheter
4Mbit 512K words x 8 bit 512K 8bit 10ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS-artikelnummer 188-5332
Tillv. art.nrCY7C1009D-10VXI
25,293 kr
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1Mbit 128k x 8 bit 128k 8bit 10ns - 100MHz - Asynchronous Surface Mount SOJ 32 0.83 x 0.305 x 0.11in 2.79mm
RS-artikelnummer 811-5208
Tillv. art.nrIS62WV1288BLL-55TLI
VarumärkeISSI
17,027 kr
Each (In a Pack of 3)
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1Mbit 128k x 8 128k 8bit 55ns 17bit - Yes - Surface Mount TSOP 32 18.5 x 8.1 x 0.95mm 0.95mm
RS-artikelnummer 170-0738
Tillv. art.nrAS6C4008-55SIN
VarumärkeAlliance Memory
33,661 kr
Each (In a Tube of 22)
Enheter
4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS-artikelnummer 170-0920
Tillv. art.nrAS6C1616-55TIN
VarumärkeAlliance Memory
86,471 kr
Each (In a Tray of 135)
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16Mbit 1024K x 16 bit 1024K 16bit 55ns 16bit 1MHz Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS-artikelnummer 666-8150
Tillv. art.nr23K640-I/SN
VarumärkeMicrochip
5,832 kr
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64kbit 8192 words x 8 bit 8K 8bit 25ns 16bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS-artikelnummer 170-0741
Tillv. art.nrAS7C34098A-12JIN
VarumärkeAlliance Memory
42,633 kr
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4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount SOJ 44 28.7 x 10.29 x 2.92mm 2.92mm
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RS-artikelnummer 198-7990
Tillv. art.nrCY62128ELL-45ZXIT
27,152 kr
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Enheter
1024kbit 128K x 8 128K 8bit 45ns - - - - - - - - -
RS-artikelnummer 170-0898
Tillv. art.nrAS7C34098A-10TCN
VarumärkeAlliance Memory
39,513 kr
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Enheter
4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS-artikelnummer 744-4567
Tillv. art.nrAS6C4016-55ZIN
VarumärkeAlliance Memory
38,15 kr
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Enheter
4Mbit 256K x 16 bit 256K 16bit 55ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.6 x 10.3 x 1.05mm 1.05mm
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RS-artikelnummer 198-8004
Tillv. art.nrCY7C1021D-10ZSXIT
31,40 kr
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1024kbit 64K x 16 65536 16bit 10ns - - - - - - - - -