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 Prix 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
N° de stock RS 538-192
Référence fabricantAS7C34098A-12JIN
4,55 €
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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
N° de stock RS 193-8469
Référence fabricantCY7C10612G30-10ZSXI
15,363 €
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16Mbit 1 M x 16 bit 1 M 16bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP II 54 22.313 x 10.058 x 0.95mm 0.95mm
N° de stock RS 145-3875
Référence fabricantN01S830HAT22I
3,18 €
Each (In a Tube of 100)
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1Mbit 128K x 8 bit - 128K 5ns 24bit 20MHz Yes Synchronous Surface Mount TSSOP 8 4.4 x 3 x 0.9mm 0.9mm
N° de stock RS 126-6969
Référence fabricantR1LV1616HSA-4SI#B1
48,10 €
Each
Unité
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
N° de stock RS 171-0975
Référence fabricantCY62148EV30LL-45BVXI
4,257 €
Each (In a Tray of 480)
Unité
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount VFBGA 36 6 x 8 x 0.84mm 0.84mm
N° de stock RS 171-0970
Référence fabricantCY62137FV30LL-45BVXI
2,354 €
Each (In a Tray of 480)
Unité
2Mbit 128K x 16 bit 128K 16bit 45ns 16bit - Yes - Surface Mount VFBGA 48 6 x 8 x 0.81mm 0.81mm
N° de stock RS 170-0743
Référence fabricantAS7C4098A-12JIN
4,216 €
Each (In a Tube of 16)
Unité
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
Nouveau
N° de stock RS 198-7989
Référence fabricantCY62128ELL-45ZXIT
1,406 €
Each (On a Reel of 1500)
Unité
1024kbit 128K x 8 128K 8bit 45ns - - - - - - - - -
N° de stock RS 125-7516
Référence fabricantCY62167EV30LL-45ZXA
12,99 €
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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
N° de stock RS 125-7533
Référence fabricantCY7C1021DV33-10ZSXI
1,368 €
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Unité
1Mbit 64K x 16 bit 64K 16bit 10ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
N° de stock RS 125-7542
Référence fabricantCY7C199D-10VXI
1,872 €
Each (In a Pack of 5)
Unité
256kbit 32K x 8 bit 32K 8bit 15ns 8bit - Yes - Surface Mount SOJ 28 18.03 x 7.62 x 0.254mm 0.254mm
Nouveau
N° de stock RS 198-8007
Référence fabricantCY7C1049GN30-10VXIT
3,112 €
Each (On a Reel of 500)
Unité
4096kbit 512K x 8 512K 16bit 10ns - - - - - - - - -
N° de stock RS 181-8272
Référence fabricantCY14E256LA-SZ25XI
16,434 €
Each (In a Tube of 22)
Unité
256kbit 32K x 8 bit 32K 8bit 25ns - - Yes - Surface Mount SOIC 32 20.87 x 7.59 x 2.29mm 2.29mm
N° de stock RS 170-0739
Référence fabricantAS6C4008-55TIN
2,835 €
Each (In a Tray of 156)
Unité
4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
N° de stock RS 901-5795
Référence fabricantR1LV1616HSA-4SI#B0
44,01 €
Each
Unité
16Mbit 2M x 8 bit 2M 8bit 45ns - - Yes Asynchronous Surface Mount TSOP 48 18.5 x 12.1 x 1mm 1mm
N° de stock RS 146-3213
Référence fabricant47L04-I/ST
MarqueMicrochip
0,555 €
Each (In a Tube of 100)
Unité
4kbit 512K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount TSSOP 8 3.1 x 4.5 x 1.05mm 1.05mm
N° de stock RS 181-7452
Référence fabricantCY7C1062G30-10BGXI
37,702 €
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16Mbit 512K x 32 bit 512K 32bit 10ns - - - Asynchronous Surface Mount PBGA 119 22 x 14 x 1.8mm 1.8mm
Nouveau
N° de stock RS 198-8003
Référence fabricantCY7C1021D-10ZSXIT
1,872 €
Each (On a Reel of 1000)
Unité
1024kbit 64K x 16 65536 16bit 10ns - - - - - - - - -
N° de stock RS 178-4005
Référence fabricant23K640-I/SN
MarqueMicrochip
0,518 €
Each (In a Tube of 100)
Unité
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
N° de stock RS 181-7443
Référence fabricantCY62148EV30LL-45ZSXI
3,147 €
Each (In a Tray of 117)
Unité
4Mbit 512K x 8 bit 512K 8bit 45ns 8bit - Yes - Surface Mount TSOP 32 21.08 x 10.29 x 1.05mm 1.05mm