Part Number: SN74LVCH16T245-EP
I am using SN74LVCH16T245-EP in one of my project. Here I am driving 16 IO's of SN74LVCH16T245 from B port to A port. A port is referenced to 3.3V and B port is referenced to 5V.
A and B ports of SN74LVCH16T245-EP do not have external pull-up or pull-down resistors in my system.
(I know that external pull-up resistor is not required because the device has a built-in bus hold function.)
Also, I applied a 5V signal to the B ports and kept the ~OE signal 'HIGH'(3.3V).
In this environment, the voltage level at B ports is 1.2V, not 5V.
why is the 1.2V voltage measured at B Ports?
(I know that the B ports stay 'Hi-Z' when the OE signal is 'HIGH'. Also, if 5V signal is supplied to B port in 'Hi-Z' state, I think it should keep 5V.)
Please answer in my question.
I will wait your answer.
When you are applying a 5 V signal to a B port pin, it should not be possible for the voltage at the pin to be anything but 5 V.
Where does that 5 V signal come from? Can you check whether a current flows?
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Can you provide a schematic and scope shot of your issue? This will help make sure to understand your issue completely.
A schematic with annotated voltages would be helpful if you do not have scope shots.
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