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Shift Registers

Q1:

What does the output enable do on the 74395A chip?

A It determines when data can be loaded.

B It forces all outputs to go HIGH.

C It forces all outputs to go LOW.

D It activates the three-state buffer.

ANS:D - It activates the three-state buffer.

Output of a chip is serially connected with 3 state buffer. It has High, Low and High impedance (Z) state. In output disable buffer in high impedance state. If Output enables given then it gives high or low output based on output.



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