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Decoders and multiplexers are termed, medium scale integration (MSI) devices; this term implies that the device is complex in construction and usually its operation as well. Below is shown a block diagram of a 2 -> 4 decoder
The decoder can be thought of as a simple base 10 converter. The binary input's A, B select the base 10 equivalent output, namely O3-> O0. It should be noted that usually the decoder is active low outputs i.e. logic '0' for on and logic '1' for off. Various size decoders are available 2->4, 3->8, 4->16, and 4->10. The operation is made easy by considering the truth table for a 2->4 decoder: -
Within logic we also have sequential logic circuits, the building blocks of these MSI devices are flip flops. There are four basic flip flops namely: SR Flip flop JK Flip flop D-type T-type Note the following truth tables shown below are only valid if the clock is active (usually active low).The operation of these devices are simple in that the devices either stores the last value (i.e. doesn't change), resets, sets, or toggles (i.e. output inverts itself).
It should be noted that the CMOS and TTL logic families have sequential logic within their families and they usually have asynchronous preset (PR) and clear (CL). Let us consider some simple applications of sequential logic.
Q. Show the Subtraction Method? For this procedure (method), start with a weighted position value greater that the number. If the number is greater than the weighted position f
The electric roadway system shall utilize solar energy as the main power source. The electric roadway system shall negotiate with the power utility on backup power supply.
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Memory map of tpa in a personal computer and explain such of the areas in brief
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The Maximum clock frequency in 8086 is 5 MHz .
Q. Show Function of Compensating Plate in interferometer? In absence of plate G2 the reflected ray passes the plate G1 twice, whereas the transmitted ray does not passes even o
1.) A three phase, D0 HP, 1765 rpm, BA0 V induction motor operating at three quarter load has an efficiency of 91% and a power factor of 87%. Determine active power, apparent pow
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