We're building Ben Eater's CPU. We have voltage on the bus of ~1.4V.
We isolated a 74LS273 and wired it like so:
At VM, we're measuring 1.2 V even with a 10k pulldown resistor.
Why is that and how do I get it closer to 0V? I need the voltage below ~0.3V so that other components as the 74LS157 will properly detect it as a digital LOW.
Of course I can replace the pulldown resistor by 0 Ohm (we tried and it worked), but then the input becomes completely unusable.
This is in a less professional environment. We have ESD protection, but I cannot completely ensure it has always been used. Is it an indicator that the 74LS273 is broken?