8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

8.1 Application Information

In this application, a 2-input XOR gate is used as a phase difference detector as shown in Typical Application

Block Diagram. The remaining three gates can be used for other applications in the system, or the inputs can be

grounded and the channels left unused.

The SN74ACT86-Q1 is used to identify phase difference between a reference clock and another input clock.

Whenever the clock states are different, the XOR output will pulse HIGH until the clocks return to the same state.

The output is fed into a low-pass filter to obtain a DC representation of the phase difference.

8.2 Typical Application

C

R

Output

Input Clock

Reference Clo ck

Figure 8-1. Typical Application Block Diagram

SN74ACT86-Q1

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