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 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. 181-7452
Mfr. Part No.CY7C1062G30-10BGXI
SGD72.402
Each (In a Tray of 84)
units
16Mbit 512K x 32 bit 512K 32bit 10ns - - - Asynchronous Surface Mount PBGA 119 22 x 14 x 1.8mm 1.8mm
RS Stock No. 767-5967
Mfr. Part No.R1WV6416RSD-5SI#B0
SGD105.00
Each
units
64Mbit 4M words x 16 bit 4M 16bit 55ns - - Yes Asynchronous Surface Mount μTSOP II 52 10.89 x 8.99 x 1mm 1mm
RS Stock No. 165-9383
Mfr. Part No.DS1245AB-120+
BrandMaxim
SGD41.376
Each (In a Tube of 11)
units
1024kbit 128K x 8 bit 128K 8bit 70ns 8bit - Yes - Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 10.92mm
RS Stock No. 171-0989
Mfr. Part No.CY7C1020D-10ZSXI
SGD6.146
Each (In a Tray of 270)
units
512kbit 32K x 16 bit 32K 16bit 10ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 170-2054
Mfr. Part No.IS61C256AL-12TLI
BrandISSI
SGD2.074
Each (In a Tray of 234)
units
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount TSOP 28 8.1 x 11.9 x 1mm 1mm
RS Stock No. 125-7530
Mfr. Part No.CY7C1020D-10ZSXI
SGD7.90
Each (In a Pack of 2)
units
512kbit 32K x 16 bit 32K 16bit 10ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 744-4558
Mfr. Part No.AS7C31024B-12TCN
SGD4.04
Each
units
1Mbit 128K x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount TSOP 32 18.5 x 8.1 x 1.05mm 1.05mm
RS Stock No. 177-5518
Mfr. Part No.AS6C1008-55SIN
SGD2.905
Each (In a Tube of 22)
units
1Mbit 128K words x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Surface Mount SOP 32 20.75 x 11.3 x 2.82mm 2.82mm
RS Stock No. 666-8144
Mfr. Part No.23K256-I/P
BrandMicrochip
SGD1.804
Each (In a Pack of 5)
units
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 Stock No. 170-2183
Mfr. Part No.IS61WV25616EDBLL-10TLI
BrandISSI
SGD5.084
Each (In a Tray of 135)
units
4Mbit 256k x 16 256k 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 171-0979
Mfr. Part No.CY62157EV30LL-55ZSXE
SGD15.094
Each (In a Tray of 135)
units
8Mbit 512K x 16 bit 512K 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 170-2069
Mfr. Part No.IDT7130LA25JGI
BrandIDT
SGD16.44
Each (In a Tube of 24)
units
8kbit 1K x 8 bit 1K 8bit 25ns 8bit - Yes Asynchronous Surface Mount PLCC 52 19 x 19 x 3.63mm 3.63mm
RS Stock No. 182-3401
Mfr. Part No.CY7C109D-10VXIT
SGD5.19
Each (In a Pack of 3)
units
- - - - - - - - - - - - - -
RS Stock No. 124-2947
Mfr. Part No.CY62167EV30LL-45BVXI
SGD14.78
Each
units
16Mbit 1M x 16 bit, 2M x 8 bit 1M, 2M 8 bit, 16 bit 45ns 8 bit, 16 bit 1MHz Yes - Surface Mount VFBGA 48 6 x 8 x 0.79mm 0.79mm
RS Stock No. 786-0739
Mfr. Part No.DS1245Y-100+
BrandMaxim
SGD75.60
Each
units
1Mbit 128K x 8 bit 128K 8bit 100ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 178-4114
Mfr. Part No.23LC512-I/ST
BrandMicrochip
SGD2.188
Each (In a Tube of 100)
units
512kbit 64k x 8 bit 64K 8bit 25ns 16bit 20MHz - Synchronous Through Hole TSSOP 8 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 146-8876
Mfr. Part No.47C04-I/P
BrandMicrochip
SGD1.22
Each (In a Pack of 10)
units
4kbit 512K x 8 - 8bit - - 1000kHz Yes Synchronous Through Hole DIP 8 10.2 x 7.1 x 4.83mm 4.83mm
RS Stock No. 181-7619
Mfr. Part No.CY7C1062G30-10BGXI
SGD83.39
Each
units
16Mbit 512K x 32 bit 512K 32bit 10ns - - - Asynchronous Surface Mount PBGA 119 22 x 14 x 1.8mm 1.8mm
RS Stock No. 811-5181
Mfr. Part No.IS61WV25616BLL-10TLI
BrandISSI
SGD7.51
Each (In a Pack of 2)
units
4Mbit 256k x 16 256k 16bit 10ns 18bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS Stock No. 811-5197
Mfr. Part No.IS61WV6416DBLL-10TLI
BrandISSI
SGD2.877
Each (In a Pack of 3)
units
1Mbit 64k x 16 64k 16bit 10ns 16bit - - Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
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