What is the difference between TTL and CMOS?
369710
TTL (Transistor-Transistor Logic) is a name for type of logic circuits which are constructed using the bipolar transistors. \n\nIn general the bipolar transistors such as the NPN and PNP transistors are current operated devices. In these types of transistors, when used for digital logic circuits, typically the input voltage is applied across the Base-Emitter junction. As a result of this a small base current is produced in that junction. This small base current is magnified by the transistor's current gain factor B(called Beta), resulting in a large amount of collector-emitter current. This is basiclly how a TTL switch works.\n\nThe TTL family of circuits are generally very fast, but this speed comes at the cost of higher power dissipation. Also, a typical TTL logic gate circuit requires multiple transistors and other passive components such as resistors. This results in lower number of gates that can be put on an IC built using TTL family.\n\nThe CMOS(Complimentary Metal Oxide Semiconductor) family of logic circuits are buit using Metal Oxide Semiconductor(MOS) Field Effect Transistors (FET). These types of transistors are voltage operated devices. A typical CMOS logic gate circuit can be constructed using as little as two MOSFET transistors (A CMOS Inverter) resulting in a much higher density of logic gates that can be put on an IC.\n\nAlso, CMOS gates use much much lower power to operate compared to the TTL gates because no resistors are required to build such circuits.\n\nCMOS logic also allows much higher operating voltages compared to the TTL family.\n\nOne drawback of CMOS family is that they are slower than the TTL family, however these days this may no longer be true.
942553
depends on the retantion mechanism that it has. use a screwdriver it's simple. . be sure when replacing it u have the exact voltage .size..  of the cmos battery. ur pc can run without the battery although ull get ur bios cleared at every boot
1140630
The above answer is right but missing a detail (the carry bit if you need it).\n\nHS = X (XOR) Y\nCO = X (AND) Y\n\nwhere:\nHS => "half sum"\nCO => "carry out"\nX => input\nY => input\n\nNow, it seems you actually want to implement XOR and AND with discrete components (resistors, diodes, transistors)?  I would highly recommend buying packages rather than building them yourself.  You can get several gates on one small dual inline package that fits nicely on your breadboard or whatever.\n\nIf you really need to implement them with discrete components, I'm sure there are diagrams on the web showing XOR/AND gates for TTL and CMOS logic.
840344
Also known as a RTC/NVRAM or CMOS RAM, CMOS is short for Complementary Metal-Oxide Semiconductor. CMOS is an on-board semiconductor chip powered by a CMOS battery inside IBM compatible computers that stores information such as the system time and system settings for your computer. A CMOS is similar to the Apple Macintosh computer's PRAM.  If the battery dies then you can still boot your machine but there will be no settings saved. :)  The batteries are cheap...
911971
The majority of passive tags use EEPROM memory. Some are laser programmed at the silicon level. Many active tags utilize battery-backed SRAM.
5064
Each chip has a crystal (oscillator) which has an exact frequency. Knowing the frequency people calculate how many executions it takes (from that frequency) to get one second. That is then calibrated (programmed) in the chip and … internal clock become live :)
811444
CMOS battery is dead.  Just replace it with the same type.  Little coin battery on the motherboard.\n\nEdit -  these are watch batteries easily found at the nearest drug store.
100415
There is not enough information to answer this question. Switches and routers have a number of different components. Each component has a separate MTBF and MTTR. To answer the question fully would require knowledge of the individual components of the switch in question. In addition, you would need to know if any of the components have redundancies built in. \n\nI have tried to obtain this information in the past from different sources. The best place to get the information is to contact Cisco directly. You can contact their pre-sales department (obtain the number from their website).\n\nI obtained data from the 6500 series switches and they generally tend to be near 200,000 hours (MTBF).\n\nThe MTTR or mean time to repair is composed of two components, the time to respond and the time to fix. This can vary based upon a number of factors (IT operation procedures, sparing policies, weekend vs. weekday). In general, Cisco tends to default to a one hour MTTR when calculating the MTBF of the entire piece of equipment.
95879
They are completely different as it was explained above. But other important difference is that a PLC could accept Analog Signals, Microcontroller is digital.
364446
It varies and isn't really predictable like the Moore's Law.\nhttp://www.ask.com/web?q=moore's%20law
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("see-moss"), which stands for complementary metal-oxide-semiconductor, is a major class of integrated circuits. CMOS chips include microprocessor, microcontroller, static RAM, and other digital logic circuits. The central characteristic of the technology is that it only uses significant power when its transistors are switching between on and off states. Consequently, CMOS devices use little power and do not produce as much heat as other forms of logic. CMOS also allows a high density of logic functions on a chip.\n\nThe word "complementary" refers to the fact that the design uses pairs of transistors for logic functions, only one of which is switched on at any time.\n\nThe phrase "metal-oxide-semiconductor" is a reference to the nature of the fabrication process originally used to build CMOS chips. That process created field effect transistors having a metal gate electrode placed on top of an oxide insulator, which in turn is on top of a semiconductor material. Instead of metal, today the gate electrodes are almost always made from a different material, polysilicon, but the name CMOS nevertheless continues to be used for the modern descendants of the original process. (See also MOSFET.)\n\nA chip with a large number of CMOS transistors packed tightly together is sometimes known as CHMOS (for "Complementary High-density metal-oxide-semiconductor").\n\nThe combination of MEMS sensors with digital signal processing on one single CMOS chip is sometimes known an CMOSens.
1113613
Time to scrap that junk out dude! This is the 21st century! That unit came out just a little after the abacus! Seriously though, you need to replace the cmos battery. Everytime you shut down your bios looses data that would normally be saved. That is what the cmos battery is for.
304534
Well... that's kind of a broad question, but here's the basics both signals. \n\nDigital Signal\n----------------------------\nA digital signal is like an electronic representation of bianary.  it has 2 states, high and low.  It depends on the logic being used (CMOS, TTL, or ECL), but the lows can run anywhere from -5.2 VDC in ECL Logic, and the highs up to +5.2VDC in TTL Logic.  in the o'scope, all you will see looks a little like:\n_-_--____--_--__--_--_____-__-----_       <==== where you can see definate highs and lows.\n\n__--__--__--__--__--__--__--__--__--__ <== A typical digital clocking signal, like in your computer\n\nAnalog Signal\n------------------------\nAn analog signal is like what you see in your windows media player when you turn on the o'scope visualisation (do it, it's a good example of an analog signal).  The pure definition of an analog signal is a variable signal that is continuous in both time and amplitude.  It could be a perfect Sine, triangle, square, or sawtooth Wave ( http://en.wikipedia.org/wiki/Image:Waveforms.png ), a straight DC level, or what you see in the Media Player Example.
21479
Looks like OC3s run $30-50k/mo., while OC24s run around $100k/mo.
1154044
and or and not are logical functions but moreover they are gates not switches. Microcontrollers are made of thousands of transistors (sometimes referred to as switches.) as they are configured to create logical units and buffers. \n\nHowever to correct the author of the question, it is not a matter of switch type (transistor, such as HMOS, CMOS, NMOS for example) But more than that, one kind of switch could you not use to create a "CPU" and the answer to that is it depends on how slow  or fast it has to be. We could create one made up of Bi-polar Transistors it would be huge and very hot in comparison , however it can be done and has been. How do you think we got them to size and speed they are today..
334689
As much as i know, all IC's have certain numbers. There are many many IC's that are performing many many different jobs. so in order to recongize which IC is doing what job it has a different number than a IC doing a different job. For example a IC used in a radio can not do the job of a IC used in TV and similarly a IC used in TV cannot do the job for a IC in radio. hence they have different numbers . so if a IC is damagerd it can only be replced by another IC of the same number.\nfor example  \n 74LS xxx  is transistor transistor logic. so if you take a microscope and look into this kind of IC you will find a lot of transistors. \nand  74HCxxx  OR Cd40xxx  series of IC are MOSFET based and if you take a microscope and look deep into these series u will find alot of MOSFET's .\nthankyou/
1153692
Computers have TWO clocks built into them.. one being the CMOS clock,, the other being the Real Time clock..The battery keeps power going to those when the computer is not plugged into electric