/diy/ - Do It Yourself

Anonymous Tue Mar 28 23:00:33 2017 No.1152501 [View]
File: 3 KB, 325x302, TTL NAND.png [View same] [iqdb] [saucenao] [google]

>>1152451
Under 9.2.2
>2.Recommend output Conditions:
>Load currents should not exceed 25 mA per output and 50 mA total for the part.

I think with TTL, floating output is considered "high". To actually make a positive voltage, you need a pull-up resistor.

Not sure if this applies to 74HC.
Slap a 1K resistor between output and ground and see if it drops ~5V with a "high" output

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/diy/ - Do It Yourself

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