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Typo in schematics (74HC595 pinout) #22

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JeffreyDeanBrown opened this issue Sep 17, 2023 · 1 comment
Open

Typo in schematics (74HC595 pinout) #22

JeffreyDeanBrown opened this issue Sep 17, 2023 · 1 comment

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@JeffreyDeanBrown
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Pin 13 on the 74HC595 chips (the output enable pin, OE) is labeled as "G", and pin 8 (the ground pin, GND) is not labeled.
Both Pin 8 (GND) and Pin 13 (OE) need to be tied to ground for this design to work properly.

I saw "G" tied to ground and assumed that was referring to ground, and didn't give it a second thought. a couple hours later with the oscilloscope I finally figured out why it wasn't working for me- my OE pins were floating because I wasn't paying attention.

It's my own fault for not paying attention, but I'm submitting this just incase someone else has the same issue.

@SnappyRiffs
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U3 and U4 does not appear to have vcc and ground, could be an issue with kicad. "G" refers to OE yes, and I think it is just the fact that different IC manufacturers use different symbols (TI uses /OE)

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