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 767-5963
Tillv. art.nrR1WV6416RBG-7SI#B0
566,12 kr
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64Mbit 4M words x 16 bit 4M 16bit 70ns - - Yes Asynchronous Surface Mount FBGA 48 8.5 x 11 x 0.8mm 0.8mm
RS-artikelnummer 126-6972
Tillv. art.nrR1LV5256ESA-5SI#B1
34,74 kr
Each
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256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes - Surface Mount SOP 28 11.9 x 8.1 x 1mm 1mm
RS-artikelnummer 901-5792
Tillv. art.nrR1LV1616HBG-5SI#B0
349,80 kr
Each
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16Mbit 1M x 16 bit 1M 16bit 55ns 16bit 1MHz Yes - Surface Mount TFBGA 48 8 x 9.5 x 0.9mm 0.9mm
RS-artikelnummer 126-6976
Tillv. art.nrRMLV0408EGSB-4S2#AA1
107,95 kr
Each
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4Mbit 512K words x 8 bit 512K 8bit 45ns 19bit - Yes - Surface Mount TSOP 32 11.9 x 8.1 x 1mm 1mm
RS-artikelnummer 901-5751
Tillv. art.nrR1RP0416DSB-2PI#D0
192,86 kr
Each
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4Mbit 256K x 16 bit 256K 16bit 12ns - - Yes Asynchronous Surface Mount TSOP 32 21.05 x 10.26 x 1mm 1mm
RS-artikelnummer 126-6974
Tillv. art.nrR1WV6416RSA-5SI#B0
757,18 kr
Each
Enheter
64Mbit 4M words x 16 bit, 8M words x 8 bit 4M, 8M 8 bit, 16 bit 55ns 21 bit, 22 bit - Yes - Surface Mount TSOP 48 18.5 x 12.1 x 1mm 1mm
RS-artikelnummer 901-5806
Tillv. art.nrR1LV0108ESA-5SI#B0
41,05 kr
Each (In a Bag of 2)
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1Mbit 128K x 8 bit 128K 8bit 55ns 8bit 1MHz Yes - Surface Mount TSOP 32 11.9 x 8.1 x 1mm 1mm
RS-artikelnummer 901-5764
Tillv. art.nrR1RW0408DGE-2LR#B0
198,94 kr
Each
Enheter
4Mbit 512K x 8 bit 512K 8bit 12ns 8bit 1MHz - - Surface Mount SOJ 36 23.62 x 10.29 x 3.05mm 3.05mm
RS-artikelnummer 126-6983
Tillv. art.nrRMLV0816BGSB-4S2#AA0
142,11 kr
Each
Enheter
8Mbit 512K words x 16 bit 512K 16bit 45ns 19bit - Yes - Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS-artikelnummer 901-5723
Tillv. art.nrR1LV1616RBG-5SI#B0
335,74 kr
Each
Enheter
16Mbit 1M x 16 bit 1M 16bit 55ns - - Yes Asynchronous Surface Mount FBGA 48 7.5 x 8.5 x 0.8mm 0.8mm
RS-artikelnummer 126-6964
Tillv. art.nrR1LP0408DSB-5SI#B1
119,08 kr
Each
Enheter
4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes - Surface Mount TSOP 32 21.05 x 10.26 x 1.05mm 1.05mm
RS-artikelnummer 901-5727
Tillv. art.nrR1LV1616RBG-7SI#B0
336,77 kr
Each
Enheter
16Mbit 1M x 16 bit, 2M x 8 bit 1M, 2M 8 bit, 16 bit 70ns 8 bit, 16 bit 1MHz - - Surface Mount TFBGA 48 7.5 x 8.5 x 0.8mm 0.8mm
RS-artikelnummer 126-6978
Tillv. art.nrRMLV0416EGBG-4S2#AC0
90,99 kr
Each
Enheter
4Mbit 256K words x 16 bit 256K 16bit 45ns 18bit - Yes - Surface Mount FBGA 48 7.58 x 8.58 x 0.8mm 0.8mm
RS-artikelnummer 901-5733
Tillv. art.nrR1RP0408DGE-2LR#B0
158,10 kr
Each
Enheter
4Mbit 512K x 8 bit 512K 8bit 12ns 8bit 1MHz - - Surface Mount SOJ 36 23.62 x 10.29 x 2.75mm 2.75mm
RS-artikelnummer 901-5742
Tillv. art.nrR1RP0408DGE-2PI#B0
138,53 kr
Each
Enheter
4Mbit 512K x 8 bit 512K 8bit 12ns 8bit 1MHz - - Surface Mount SOJ 36 23.62 x 10.29 x 2.75mm 2.75mm
RS-artikelnummer 126-6969
Tillv. art.nrR1LV1616HSA-4SI#B1
497,35 kr
Each
Enheter
16Mbit 1M words x 16 bit, 2M words x 8 bit 1M, 2M 8 bit, 16 bit 45ns 19 bit, 20 bit - Yes - Surface Mount TSOP 48 18.5 x 12.1 x 1.05mm 1.05mm
RS-artikelnummer 126-6984
Tillv. art.nrRMLV0816BGSD-4S2#AC0
157,90 kr
Each
Enheter
8Mbit 512K words x 16 bit, 1024K words x 8 bit 512K, 1024K 8 bit, 16 bit 45ns 18 bit, 19 bit - Yes - Surface Mount TSOP 52 10.89 x 8.99 x 1mm 1mm
RS-artikelnummer 901-5761
Tillv. art.nrR1RW0408DGE-2PR#B0
138,45 kr
Each
Enheter
4Mbit 512K x 8 bit 512K 8bit 12ns 8bit 1MHz - - Surface Mount SOJ 36 23.62 x 10.29 x 3.05mm 3.05mm
RS-artikelnummer 767-5941
Tillv. art.nrR1LV1616HSA-4SI#B0
142,89 kr
Each
Enheter
16Mbit 2M words x 8 bit 2M 8bit 45ns - - Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1mm 1mm
RS-artikelnummer 126-6965
Tillv. art.nrR1LP5256ESA-5SI#B1
29,26 kr
Each
Enheter
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes - Surface Mount TSOP 28 11.9 x 8.1 x 1mm 1mm