The absolute maximum ratings forbid any I/O voltage exceeding the supply voltage, unless the current is limited to 20 mA.
Just use a device with overvoltage-tolerant inputs, e.g., SN74AHC245.
Are the legacy signals 5 V TTL or 5 V CMOS?
Because in the former case, 3.3 V is a valid high voltage, and you can simply run the transceiver with overvoltage-tolerant inputs at 3.3 V (and use a simpler one like the SN74AHC245).
Part Number: DP83867IS Other Parts Discussed in Thread: SN74AHC245 , Hi Team,
My customer wants to insert a buffer device such as SN74AHC245 between MAC and PHY because the interval is a little bit long(almost 5 inchs). In their system, They haven't gotten…
Part Number: SN74ABT245B Other Parts Discussed in Thread: SN74VMEH22501 , SN74AHCT245 , SN74LVC245A Tool/software: Hi Folks,
We are planning to use SN74ABT245B as a transceiver in new VME design.
Below are details of VME board which we are going to use…
A transceiver can transmit data in both directions (one direction is selected with a DIR pin).
AHC inputs are overvoltage tolerant, AHC outputs are not. For a transceiver like the SN74AHC24 5 , where all I/O pins have both input and output hardware, this…