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SN74AVC8T245: Direction and enable control

Ashutosh Nahar
Intellectual 640 points
Part Number: SN74AVC8T245
Other Parts Discussed in Thread: ASH

Hi,

I am using SN74AVC8T245RHLR part in my board.Previously there was requirement of data transmission is in only one direction so I was making DIR pin low and signal is going from B port to A Port.

But now new requirement came in which data should flow in both the direction, so for this I tied the DIR pin to one of GPIO pin. When I set GPIO as LOW  then data transmission is from B to A.

And if I set the GPIO pin as HIGH then the direction should be  A to B but I am not able to read proper output.

I have one doubt that Can i toggle the DIR pin of level translator when the enable pin is LOW(active state) or first I need to put the enable pin as tristate and then I need to toggle the direction and then I need to

make enable as low again.

Thanks

Ash

  • 0
    TI__Guru* 97046 points
    Hi Ash,
    The direction pin can be changed when the enable is in either state. It's important to note that the direction pin is referenced to VCCA, so the voltage on that side should be used for switching the direction.

    There is also some timing involved - note the delays listed in section 6.6 (and later) in the datasheet.