At 01:26 PM 12/15/99 -0600, you wrote:
>        A lot of present commonly-available logic devices are 5-volt.
>Are there chips that do bidirectional 3/5-volt interfacing so
>everything sees the levels it should?
YES there are! very low power CMOS.  74LHC and a74LVC series as I recall.
Power with 3.5 volts.  Inputs can go to 7.
Kelly



William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems
<borsum@dascor.com> & <www.dascor.com>San Diego, California, USA