Henry C. Ott wrote:
>
>  Hi Folks,
>
>  Does anybody know the difference between the 16C554 and the 16C554A?
>  I went over the data sheets and the only obvious difference I can see is
> that the 'A' series has a more restricted voltage range.
>

<snip>

The A denotes die shrink. "A" version chips are smaller die, so cheaper
to make, so all new designs should be of this type.

Russell