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Mixed voltage designs – interfacing components

To interface a 5V output to a 3.3V input on a slow signal, use a simple voltage divider.  Note, however, that these added resistors will slow the rise time of the signal.

For a faster signal, run the signal through a buffer in the VHC logic family.  These parts have 5V tolerant I/O even when powered by 3.3V.

To interface a 3.3V output to a 5V input, run the signal through a buffer in the HCT product family.  These parts have a TTL input stage with a Vih spec of 2V.

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