Showing posts with label ttl. Show all posts
Showing posts with label ttl. Show all posts
Wednesday, April 10, 2013
Multiplexer with TTL IC 74251
Actually you can not bother to design a multiplexer using logic gates because it has many special IC which functioned for a multiplexer.
One of the TTL ICs from the family that you can use to fulfill the function of a multiplexer is IC 74 251. At the IC there are 8 input channels and 3-bit selector and the other lane as a control reset and inverting output. As a note if you are using TTL ICs for your electronic circuit, the voltage supply that is allowed a maximum of 5 volts. So you can be more familiar with the workings of this multiplexer ic, IC74251 consider the truth table below:
C | B | A | G | Y | W |
X | X | X | 1 | Z | Z |
0 | 0 | 0 | 0 | D0 | D0’ |
0 | 0 | 1 | 0 | D1 | D1’ |
0 | 1 | 0 | 0 | D2 | D2’ |
0 | 1 | 1 | 0 | D3 | D3’ |
1 | 0 | 0 | 0 | D4 | D4’ |
1 | 0 | 1 | 0 | D5 | D5’ |
1 | 1 | 0 | 0 | D6 | D6’ |
1 | 1 | 1 | 0 | D7 | D7’ |
Z = High impedance (off) | |||||
D0,D1…D7 = Representing the output of the input lines D | |||||
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