Improved noise immunity. 5vdc TTL vs 24vdc HTL design. With TTL you have A and B pulse along with the inverse signal (negated, A' and B'), and you can evaluate them against each other. With HTL you only have A and B.
Improved noise immunity. 5vdc TTL vs 24vdc HTL design. With TTL you have A and B pulse along with the inverse signal (negated, A' and B'), and you can evaluate them against each other. With HTL you only have A and B.
A few things that come to my mind when looking at 5Vdc vs. 24Vdc.
First is transition time. The time it takes to go from 0 to 5Vdc is much shorter than the time it takes to go from 0 to 24Vdc. Also at 24Vdc you need a system that can swing 48V (0 to 24 / 0 to -24).
The other thing involves noise. Whenever you go from driving current to off you are collapsing a magnetic field which generates its own current which will be induced on any nearby wires and look like noise. The bigger the swing the larger the effect. This also has an impact on PCB size. The lower the voltage the closer you can have PCB traces to each other and the smaller you can make the PCB without getting cross talk or inducing noise onto the PCB's ground plane.
There are a lot of "little details" that add up most of which favor lower voltages.