When the data select A is HIGH at logic 1, the reverse happens and now input I 0 passes data to the output Q while input I 1 is blocked. The input A of this simple 2-1 line multiplexer circuit constructed from standard NAND gates acts to control which input ( I 0 or I 1 ) gets passed to the output at Q.įrom the truth table above, we can see that when the data select input, A is LOW at logic 0, input I 1 passes its data through the NAND gate multiplexer circuit to the output, while input I 0 is blocked. We can build a simple 2-line to 1-line (2-to-1) multiplexer from basic logic NAND gates as shown. Encoders are able to switch an n-bit input pattern to multiple output lines that represent the binary coded (BCD) output equivalent of the active input. ![]() Note that multiplexers are different in operation to Encoders. Normally, a multiplexer has an even number of 2 n data input lines and a number of “control” inputs that correspond with the number of data inputs. ![]() ![]() Generally, the selection of each input line in a multiplexer is controlled by an additional set of inputs called control lines and according to the binary condition of these control inputs, either “HIGH” or “LOW” the appropriate data input is connected directly to the output.
0 Comments
Leave a Reply. |