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. 786-0733
Mfr. Part No.DS1245Y-70IND+
BrandMaxim
HK$260.46
Each
units
1Mbit 128K x 8 bit 128K 8bit 70ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 923-7608
Mfr. Part No.DS1245Y-70IND+
BrandMaxim
HK$366.701
Each (In a Tube of 11)
units
1Mbit 128K x 8 bit 128K 8bit 70ns 17bit - Yes Asynchronous Through Hole EDIP 32 44.2 x 18.8 x 9.9mm 9.9mm
RS Stock No. 170-0736
Mfr. Part No.AS6C62256-55PCN
HK$19.502
Each (In a Tube of 15)
units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 538-148
Mfr. Part No.AS6C62256-55PCN
HK$18.155
Each (In a Pack of 2)
units
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes Asynchronous Through Hole PDIP 28 36.32 x 13.21 x 3.81mm 3.81mm
RS Stock No. 803-2181
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
HK$19.744
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 912-6849
Mfr. Part No.23LCV1024-I/SN
BrandMicrochip
HK$18.237
Each (In a Tube of 100)
units
1Mbit 128K x 8 bit - 8bit 5ns 24bit 20MHz Yes - Surface Mount SOIC 8 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 744-4561
Mfr. Part No.AS6C4008-55PCN
HK$40.91
Each
units
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 125-7535
Mfr. Part No.CY7C1051DV33-10ZSXI
HK$122.19
Each
units
8Mbit 512K x 16 bit 512K 16bit 10ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS Stock No. 102-3554
Mfr. Part No.M48Z58-70PC1
HK$104.423
Each (In a Tube of 12)
units
64kbit 8K x 8 bit 8K 8bit 70ns 13bit 1MHz Yes - Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 8.89mm
RS Stock No. 170-0895
Mfr. Part No.AS6C4008-55PCN
HK$37.113
Each (In a Tube of 13)
units
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS Stock No. 810-3576
Mfr. Part No.M48Z58-70PC1
HK$122.36
Each
units
64kbit 8K x 8 bit 8K 8bit 70ns 13bit 1MHz Yes - Through Hole PCDIP 28 39.88 x 18.34 x 8.89mm 8.89mm
RS Stock No. 178-4043
Mfr. Part No.23LC512-I/SN
BrandMicrochip
HK$12.204
Each (In a Tube of 100)
units
512kbit 64K x 8 bit 64K 8bit 5ns 8bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 786-0739
Mfr. Part No.DS1245Y-100+
BrandMaxim
HK$258.78
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. 923-7790
Mfr. Part No.DS1230Y-70IND+
BrandMaxim
HK$185.26
Each (In a Tube of 12)
units
256kbit 32K x 8 bit 32K 8bit 70ns 15bit - Yes - Through Hole EDIP 28 39.37 x 18.8 x 10.67mm 10.67mm
RS Stock No. 125-7518
Mfr. Part No.CY62177EV30LL-55ZXI
HK$475.00
Each
units
32Mbit 2M x 16 bit 2M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 171-0984
Mfr. Part No.CY62177EV30LL-55ZXI
HK$412.36
Each (In a Tray of 96)
units
32Mbit 2M x 16 bit 2M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS Stock No. 798-5208
Mfr. Part No.23LC512-I/SN
BrandMicrochip
HK$13.18
Each (In a Pack of 5)
units
512kbit 64K x 8 bit 64K 8bit 5ns 8bit 20MHz Yes Synchronous Surface Mount SOIC 8 4.9 x 3.9 x 1.5mm 1.5mm
RS Stock No. 538-160
Mfr. Part No.AS6C4008-55SIN
HK$34.80
Each
units
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 Stock No. 742-6724
Mfr. Part No.IDT71V416S10PHGI
BrandIDT
HK$56.85
Each
units
4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS Stock No. 170-2070
Mfr. Part No.IDT7133LA25JGI
BrandIDT
HK$179.53
Each (In a Tube of 18)
units
32kbit 2K x 16 bit 2K 16bit 25ns 16bit - Yes Asynchronous Surface Mount PLCC 68 24 x 24 x 3.63mm 3.63mm
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