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CC2564C: CC2564C HCI I/F not working with SN74AXCH4T245

Part Number: CC2564C
Other Parts Discussed in Thread: SN74AXCH4T245, CC2564

Hi,  in my customer application the CC2564C PIN A33 HCI_TX is connected to our  SN74AXCH4T245 via a 22 Ohm series Resistor.  The appliaction basically is looking the same applicarion as described in our SN74XCH4T245 Application Diagram

The signal which the customer can measure  comming from the HCI_TX  Output at the Levelshifter input e.g. 2B1 is loking as follow and we do not understand why ist shows  form  beginning the 0.5-0.6V  offset before turnign high.  Both devices I/O voltge is powerd from the same 1.8V supply.

Questions therefore are:

1) Does this waveform look the same in other  application's

2) Where do you think this 0.6V offset might come from

3) If I understand the Datasheet correct the CC2564 HCI_TX is Hi-Z during powerdown and after power up it will turn to High. Do you see an option that the CC2564C could provide such a voltage level even in Powerdown.

4) if you see any other root cause for this offset, please let us know.

Thanks in advance,