Working with Peggy2 Board. Using the Truth Table on page 2 of datasheet, I get pins turning on that do not match the datasheet table. I have Atmegga328P connected to Decoder CD74HC154 as shown on attached schematic. Converting Pin connections to Arduino Pins: ATMEGA Arduino 74HC154 2 0 23 3 1 …

CD74HC154 Decoder - Why does it not follow Datasheet Truth Table?

LarryD April 23, 2018, 12:40am 4

With a DVM, confirm voltages on A0-A3 and pins 3 and 12, 24 and 19, 18 'ON the' 154.

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