Franco wrote:
>
> Excuse me, i know i am totally off-topic but i need this information:
> can you tell me something about the subject?

The HC series are C-MOS devices: 2 to 6V voltage range, fast logic

The LS series are TTL devices, 4.5 to 5.5V voltage range, slower.
standard logic.

The HCT series are also C-MOS, 4.5 to 5.5V voltage range and levels
compatible with TTL.

the 4000 series are C-MOS, 3 to 15 and even 18V

the C-MOS devices have a lower power consumption than TTL, and its
fan-out capacity is also smaller than TTL

> Thanks
You're welcome..


Gael