Chapter 9 - Shift Registers

This 8-bit shift register appears to have a recirculating feature.

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In Figure 9-1, the 8-bit shift register represented by this block diagram could be implemented by cascading two 74194 universal 4-bit registers.

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The 74194 IC is called a universal shift register because it has several modes of operation such as parallel-load, shift-right, shift-left and inhibit (Hold).

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The 74194 IC has four mode-control inputs for implementing one of the four modes of operation.

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The 74194 IC is called a universal-shift register because it has several modes of operation such as count-up, count-down, quick-load, and increment.

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The 74194 IC can be used as a parallel-in parallel-out shift register.

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The 74194 IC can be used as either a shift-right or shift-left register by changing the logic levels on the two mode-control inputs and feeding data to the correct serial-data input.

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When the 74194 IC has both mode-control inputs LOW, it is said to be in the inhibit mode and will not shift right or left.

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The active-LOW clear input on the 74194 shift register IC overrides all other inputs when activated and clears outputs to 0000.

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The 74HC164 IC is called a universal-shift register because it has several modes of operation such as count-up, count-down, parallel-load, and inhibit.

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