1. Very recently I started using SN74AXC4T774EVM for SPI lines between a microcontroller (3V) and a sensor(1.8V). I am receiving proper signals as expected from PW package but not from RSV package. I was not able to find any difference in configuration of the two package in the user guide. DIR1, DIR2 and DIR3 are connected to VCCA using pull up (A->B), while DIR4 is grounded (B->A).
My connection is accordingly.
VCCA = 3V
VCCB = 1.8V
A1-> Chip select
When I am using RSV package, I am only able to receive proper signal from B1,B3 and B4. While the B2 signal line is corrupted with some noise of ground issue, which I am not able to identify. When using PW package with the same configuration, all signal lines looks good.
Here are the screenshots from my scope.
This is the MOSI line from A2.
This is the MOSI line from B2. as you can see the signal is not restored.
What could be the reason for such a behavior? The PW package is working properly.
Thank you for your time.