Tuesday, July 26, 2005

CD4069 and the T5's 3.3V output

Recently, a member of the german community Nexave wanted to connect an external peripheral to his T5. He beleived that the T5 would be easy to interface with as it used TTL levels, but no. It used 3.3V, which is starting to become increasingly common in logic circuits(TI discontinued sampling of all 5V logic lines a few weeks ago). Now, I decided to test how his circuit would react to 3.3V as the input using the breadboard I took with me on vacation. Read on for results.
First of all, here is the schematic. Click on it for a bigger version. It can also be downloaded in pdraft format for viewing on the Palm.


As you can see, the cicuit is straightforward. Most of the intelligence is comnained in the CD4069 IC which is a fairly common HEX Inverter IC(Datasheet). The image below shows the truth table of a hex inverter:

The 5k potentiometer works as an adjustable "voltage" source. Two Hex inverters were cascaded to create a buffer that mirrors on its output what it sees at its input. These two hex inverters drive a LED over a transistor as they are not strong enough alone. A test showed that the IC switched states at about 2.2V. So, it would be a safe way to convert data coming from the T5....
To finish it off, here is a possible way to build it with a breadboard(click to enlarge):

What do you think? Do you like breadboarding?

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