Electronic – Are bipolar logic familes like ECL/CML used currently for radiation hardened computing devices

Essentially, either works; A is probably better, B is more flexible.

A will drive the reset line to '1' faster, which could be an issue on a very large board.

B allows the option of adding other means of driving reset - hidden switch + paperclip, brownout monitor, watchdog timer, etc. It probably doesn't even cost the board space for a resistor, because a lot of microcontrollers have software configurable pullup resistors on each pin.

1. Using the saturated state means the output voltage doesn't depend on small variations of the input voltage.

2. Using the saturation region (or triode region for MOSFETs) can result in very low power consumption when the gate is kept stable in the 1 or 0 state.

3. However, there are logic families that use forward active mode for the output transistors in both 1 and 0 states. For example, ECL (emitter-coupled logic). The benefit of this is that the logic can switch more quickly due to no having to move enough charge in and out of the base region to move between the off and saturated states. The drawback is that ECL is more power-hungry than CMOS when the switching frequency is low.