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庫存編號 786-0733
製造零件編號DS1245Y-70IND+
BrandMaxim
HK$260.46
單位
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庫存編號 923-7608
製造零件編號DS1245Y-70IND+
BrandMaxim
HK$366.701
毎管:11 個
單位
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庫存編號 538-148
製造零件編號AS6C62256-55PCN
HK$18.155
/個 (每包:2個)
單位
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庫存編號 170-0736
製造零件編號AS6C62256-55PCN
HK$19.502
毎管:15 個
單位
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庫存編號 912-6849
製造零件編號23LCV1024-I/SN
BrandMicrochip
HK$18.237
毎管:100 個
單位
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庫存編號 803-2181
製造零件編號23LCV1024-I/SN
BrandMicrochip
HK$19.744
/個 (每包:5個)
單位
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庫存編號 102-3554
製造零件編號M48Z58-70PC1
HK$104.423
毎管:12 個
單位
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庫存編號 810-3576
製造零件編號M48Z58-70PC1
HK$122.36
單位
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庫存編號 744-4561
製造零件編號AS6C4008-55PCN
HK$40.91
單位
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庫存編號 125-7535
製造零件編號CY7C1051DV33-10ZSXI
HK$122.19
單位
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庫存編號 170-0895
製造零件編號AS6C4008-55PCN
HK$37.113
毎管:13 個
單位
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庫存編號 799-2717
製造零件編號DS1230Y-70IND+
BrandMaxim
HK$198.90
單位
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庫存編號 786-0739
製造零件編號DS1245Y-100+
BrandMaxim
HK$258.78
單位
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庫存編號 178-4043
製造零件編號23LC512-I/SN
BrandMicrochip
HK$12.204
毎管:100 個
單位
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庫存編號 742-6724
製造零件編號IDT71V416S10PHGI
BrandIDT
HK$56.85
單位
4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS庫存編號 170-2070
製造零件編號IDT7133LA25JGI
BrandIDT
HK$179.53
毎管:18 個
單位
32kbit 2K x 16 bit 2K 16bit 25ns 16bit - Yes Asynchronous Surface Mount PLCC 68 24 x 24 x 3.63mm 3.63mm
RS庫存編號 170-2150
製造零件編號IDT71V416S10PHGI
BrandIDT
HK$50.932
毎管:26 個
單位
4Mbit 256K x 16 bit 256K 16bit 10ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.41 x 10.16 x 1mm 1mm
RS庫存編號 714-4788
製造零件編號IDT7133LA25JGI
BrandIDT
HK$190.99
單位
32kbit 2K x 16 bit 2K 16bit 25ns 16bit - Yes Asynchronous Surface Mount PLCC 68 24 x 24 x 3.63mm 3.63mm
RS庫存編號 171-0984
製造零件編號CY62177EV30LL-55ZXI
HK$412.36
Each (In a Tray of 96)
單位
32Mbit 2M x 16 bit 2M 16bit 55ns 16bit - Yes - Surface Mount TSOP 48 18.4 x 12 x 1.05mm 1.05mm
RS庫存編號 811-5175
製造零件編號IS61WV102416BLL-10TLI
BrandISSI
HK$180.72
單位
16Mbit 1M x 16 1M 16bit 10ns 20bit - Yes Asynchronous Surface Mount TSOP 48 18.6 x 12.2 x 1.05mm 1.05mm