If we have a way to put logic signals into a circuit, it makes sense that we will want a way to get them out. I've gone with the tried and true method of using the logic signals to drive a collection of LEDs. A 74244 is used to buffer the signals*. LEDs are power hungry and driving them from arbitrary signals in our circuit could draw too much current and cause incorrect behaviour. Using the buffer presents a single TTL load to the circuit while at the same time providing plenty of current to make the LEDs happy.

* See a later guide in this series for more information on this handy chip.

This guide was first published on Mar 29, 2018. It was last updated on Mar 29, 2018.

This page (Logic Level Outputs) was last updated on Apr 06, 2021.

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