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 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 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
RS庫存編號 170-0740
製造零件編號AS6C6264-55SIN
HK$16.693
毎管:25 個
單位
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庫存編號 785-8691
製造零件編號DS1225AD-200+
HK$149.11
單位
64kbit 8K x 8 bit 8K 8bit 200ns 13bit - Yes Asynchronous Through Hole EDIP 28 39.37 x 18.8 x 9.35mm 9.35mm
RS庫存編號 125-7518
製造零件編號CY62177EV30LL-55ZXI
HK$475.00
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 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 798-5208
製造零件編號23LC512-I/SN
BrandMicrochip
HK$13.18
/個 (每包:5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 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 923-7598
製造零件編號DS1225AD-200+
HK$138.09
毎管:12 個
單位
64kbit 8K x 8 bit 8K 8bit 200ns 13bit - Yes Asynchronous Through Hole EDIP 28 39.37 x 18.8 x 9.35mm 9.35mm
RS庫存編號 786-0739
製造零件編號DS1245Y-100+
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 923-7611
製造零件編號DS1245Y-100+
HK$243.26
毎管:11 個
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 170-0738
製造零件編號AS6C4008-55SIN
HK$32.169
毎管:22 個
單位
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庫存編號 538-160
製造零件編號AS6C4008-55SIN
HK$34.80
單位
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 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 538-186
製造零件編號AS6C6264-55SIN
HK$18.15
/個 (每包:2個)
單位
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庫存編號 767-5979
製造零件編號R1RP0416DSB-2PI#D0
HK$181.83
單位
4Mbit 256K words x 16 bit 256K 16bit 12ns - - Yes Asynchronous Surface Mount TSOP 32 21.05 x 10.26 x 1mm 1mm
全新
RS庫存編號 188-5334
製造零件編號CY7C1021D-10ZSXI
HK$21.646
Each (In a Tray of 135)
單位
1Mbit 128k x 8 bit 128k 8bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS庫存編號 177-5532
製造零件編號AS7C4098A-12TIN
HK$35.259
Each (In a Tray of 135)
單位
4Mbit 256K words x 16 bit 256K 16bit 12ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS庫存編號 538-287
製造零件編號AS7C256A-12JIN
HK$16.285
/個 (每包:2個)
單位
256kbit 32K words x 8 bit 32K 8bit 12ns 15bit - Yes Asynchronous Surface Mount SOJ 28 18.54 x 7.75 x 2.67mm 2.67mm