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 901-5727
製造零件編號R1LV1616RBG-7SI#B0
HK$226.50
單位
16Mbit 1M x 16 bit, 2M x 8 bit 1M, 2M 8 bit, 16 bit 70ns 8 bit, 16 bit 1MHz - - Surface Mount TFBGA 48 7.5 x 8.5 x 0.8mm 0.8mm
RS庫存編號 811-5226
製造零件編號IS62WV5128BLL-55HLI
BrandISSI
HK$45.44
/個 (每包:2個)
單位
4Mbit 512k x 8 512k 8bit 55ns 19bit - Yes - Surface Mount STSOP 32 11.9 x 8.1 x 1.05mm 1.05mm
RS庫存編號 181-1549
製造零件編號CY7C1041GN30-10ZSXI
HK$30.98
Each (In a Tray of 135)
單位
4Mbit 256 kB x 16 256k 8bit 10ns 16bit 100MHz - Asynchronous Surface Mount TSOP 44 18.51 x 10.26 x 1.04mm 1.04mm
RS庫存編號 124-2950
製造零件編號CY7C109D-10VXI
HK$26.01
/個 (每包:2個)
單位
1Mbit 128K x 8 bit 128K 8bit 10ns 8bit 100MHz Yes Asynchronous Surface Mount SOJ 32 0.83 x 0.405 x 0.12in 3.05mm
RS庫存編號 170-2047
製造零件編號IS62C256AL-45ULI
BrandISSI
HK$11.907
Each (In a Tray of 120)
單位
256kbit 32K words x 8 bit 32K 8bit 45ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.24 x 8.53 x 2.84mm 2.84mm
RS庫存編號 181-8270
製造零件編號CY14B101PA-SFXI
HK$85.559
毎管:46 個
單位
1Mbit 128K x 8 bit 128K 8bit - - 104MHz Yes Synchronous Surface Mount SOIC 16 10.49 x 7.59 x 2.36mm 2.36mm
RS庫存編號 126-6979
製造零件編號RMLV0416EGSB-4S2#AA1
HK$49.88
單位
4Mbit 256K words x 16 bit 256K 16bit 45ns 18bit - Yes - Surface Mount TSOP 44 18.54 x 10.29 x 1.05mm 1.05mm
RS庫存編號 125-6969
製造零件編號CY62126EV30LL-45ZSXI
HK$21.56
/個 (每包:5個)
單位
1Mbit 64K x 16 bit 64K 16bit 45ns 16bit - Yes - Surface Mount TSOP 44 18.517 x 10.262 x 1.044mm 1.044mm
RS庫存編號 170-2043
製造零件編號IS62WV25616BLL-55TLI
BrandISSI
HK$38.941
Each (In a Tray of 135)
單位
4Mbit 256K words x 16 bit 256K 16bit 55ns 18bit - Yes Asynchronous Surface Mount TSOP 44 18.52 x 10.29 x 1.05mm 1.05mm
RS庫存編號 577-727
製造零件編號R1LP0408CSB-5SI#BT
HK$161.00
單位
4Mbit 512K x 8 bit 512K 8bit 55ns 19bit - Yes Asynchronous Surface Mount TSOP 32 - -
RS庫存編號 182-3294
製造零件編號CY7C1041GN30-10BVXI
HK$35.609
Each (In a Tray of 480)
單位
4Mbit 256K x 16 bit 256K 16bit 10ns - 100MHz - Asynchronous Surface Mount BGA 48 8 x 6 x 0.79mm 0.79mm
RS庫存編號 126-6972
製造零件編號R1LV5256ESA-5SI#B1
HK$31.09
單位
256kbit 32K words x 8 bit 32K 8bit 55ns 15bit - Yes - Surface Mount SOP 28 11.9 x 8.1 x 1mm 1mm
RS庫存編號 181-8377
製造零件編號CY14B101PA-SFXI
HK$94.63
單位
1Mbit 128K x 8 bit 128K 8bit - - 104MHz Yes Synchronous Surface Mount SOIC 16 10.49 x 7.59 x 2.36mm 2.36mm
RS庫存編號 391-731
製造零件編號IS61C1024AL-12JLI
BrandISSI
HK$18.115
/個 (每包:2個)
單位
1Mbit 128K words x 8 bit 128K 8bit 12ns 17bit - Yes Asynchronous Surface Mount SOJ 32 21.08 x 7.75 x 2.67mm 2.67mm
RS庫存編號 181-8359
製造零件編號CY7C1069G30-10ZSXI-CYP
HK$404.83
單位
16Mbit 2M x 8 bit 2M 8bit 10ns - 100MHz - Asynchronous Surface Mount TSOP 54 22.51 x 10.26 x 1.05mm 1.05mm
RS庫存編號 744-4542
製造零件編號AS6C1008-55PCN
HK$19.14
單位
1Mbit 128K x 8 bit 128K 8bit 55ns 17bit - Yes Asynchronous Through Hole PDIP 32 41.91 x 13.818 x 3.81mm 3.81mm
RS庫存編號 391-640
製造零件編號IS62C256AL-45ULI
BrandISSI
HK$15.343
/個 (每包:4個)
單位
256kbit 32K words x 8 bit 32K 8bit 45ns 15bit - Yes Asynchronous Surface Mount SOP 28 18.24 x 8.53 x 2.84mm 2.84mm
RS庫存編號 797-9398
製造零件編號DS1245AB-100+
HK$245.91
單位
1024kbit 128K x 8 bit 128K 8bit 70ns 8bit - Yes - Through Hole EDIP 32 44.2 x 18.8 x 10.92mm 10.92mm
全新
RS庫存編號 188-5332
製造零件編號CY7C1009D-10VXI
HK$23.62
毎管:23 個
單位
1Mbit 128k x 8 bit 128k 8bit 10ns - 100MHz - Asynchronous Surface Mount SOJ 32 0.83 x 0.305 x 0.11in 2.79mm
RS庫存編號 901-5723
製造零件編號R1LV1616RBG-5SI#B0
HK$231.35
單位
16Mbit 1M x 16 bit 1M 16bit 55ns - - Yes Asynchronous Surface Mount FBGA 48 7.5 x 8.5 x 0.8mm 0.8mm