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 170-0739
Tillv. art.nrAS6C4008-55TIN
VarumärkeAlliance Memory
29,315 kr
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4Mbit 512K words x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 8 x 18.4 x 1mm 1mm
RS-artikelnummer 181-7594
Tillv. art.nrCY7C1041GN-10ZSXI
44,875 kr
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4Mbit 256K x 16 bit 256K 16bit 10ns - - - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS-artikelnummer 193-8471
Tillv. art.nrCY7C199D-10VXIT
14,095 kr
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256kbit 32 k x 8 bit 32 k 8bit 10ns 8bit 1MHz - Asynchronous Through Hole SOJ 85 11.9 x 8.1 x 1mm 1mm
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RS-artikelnummer 200-9833
Tillv. art.nr48L512-I/SN
VarumärkeMicrochip
25,92 kr
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512kbit 65 k x 8 65, 536 8bit 10ns - - - - - - - - -
RS-artikelnummer 146-8939
Tillv. art.nr47L04-I/SN
VarumärkeMicrochip
5,635 kr
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4kbit 512K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS-artikelnummer 124-2946
Tillv. art.nrCY62158EV30LL-45ZSXI
69,90 kr
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8Mbit 1024K x 8 bit 1024K 8bit 45ns 8bit 1MHz Yes - Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS-artikelnummer 391-680
Tillv. art.nrIS62C1024AL-35QLI
VarumärkeISSI
18,61 kr
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1Mbit 128K words x 8 bit 128K 8bit 35ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.43 x 3mm 3mm
RS-artikelnummer 170-0892
Tillv. art.nrAS7C1026B-12TCN
VarumärkeAlliance Memory
17,669 kr
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1Mbit 64K x 16 bit 64K 16bit 12ns 16bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS-artikelnummer 170-0737
Tillv. art.nrAS6C8008-55ZIN
VarumärkeAlliance Memory
52,277 kr
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8Mbit 1024K words x 8 bit 1M 8bit 55ns 20bit - Yes Asynchronous Surface Mount TSOP 44 18.42 x 10.16 x 1mm 1mm
RS-artikelnummer 170-0740
Tillv. art.nrAS6C6264-55SIN
VarumärkeAlliance Memory
17,388 kr
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64kbit 8K words x 8 bit 8K 8bit 55ns 13bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS-artikelnummer 170-0897
Tillv. art.nrAS7C34096A-10TIN
VarumärkeAlliance Memory
40,301 kr
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4Mbit 512K x 8 bit 512K 8bit 10ns 19bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.26 x 1.05mm 1.05mm
RS-artikelnummer 742-6715
Tillv. art.nrIDT71V416L10PHGI
VarumärkeIDT
72,28 kr
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4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS-artikelnummer 146-3209
Tillv. art.nr47C16-I/SN
VarumärkeMicrochip
6,116 kr
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16kbit 2048K x 8 - 8bit - - 1000kHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS-artikelnummer 714-4839
Tillv. art.nrIDT70V25L25PFGI
VarumärkeIDT
331,19 kr
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128kbit 8K x 16 bit 8K 16bit 25ns 26bit - Yes Asynchronous Surface Mount TQFP 100 14 x 14 x 1.4mm 1.4mm
RS-artikelnummer 901-5758
Tillv. art.nrR1RP0416DSB-2LR#D0
198,66 kr
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4Mbit 256K x 16 bit 256K 16bit 12ns 16bit 1MHz - - Surface Mount TSOP 44 18.51 x 10.26 x 1mm 1mm
RS-artikelnummer 742-6724
Tillv. art.nrIDT71V416S10PHGI
VarumärkeIDT
64,63 kr
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4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS-artikelnummer 171-0985
Tillv. art.nrCY62187EV30LL-55BAXI
559,168 kr
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64Mbit 4M x 16 bit 4M 16bit 55ns 16bit - Yes - Surface Mount VFBGA 48 8 x 9.5 x 1.2mm 1.2mm
RS-artikelnummer 170-0888
Tillv. art.nrU62256AS2C07LLG1
VarumärkeAlliance Memory
34,085 kr
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256kbit 32K x 8 bit 32K 8bit 56ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.49 x 8.64 x 2.49mm 2.49mm
RS-artikelnummer 170-0921
Tillv. art.nrAS7C316098A-10BIN
VarumärkeAlliance Memory
176,957 kr
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16Mbit 1024K x 16 bit 1024K 16bit 10ns 16bit 1MHz Yes Asynchronous Surface Mount TFBGA 48 6.05 x 8.05 x 1.05mm 1.05mm
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RS-artikelnummer 200-9834
Tillv. art.nr48L256-I/SN
VarumärkeMicrochip
16,073 kr
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256kbit 32 k x 8 32, 768 8bit 10ns - - - - - - - - -