SN74AVC4T774: SN74AVC4T774 unused and DIR pins implementation

Sagar Kumar

Part Number: SN74AVC4T774

I am not using 2 I/O pins of this level translator. What to do with DIR3 and and DIR4 - need to float or connect to GND?

if I connect it with GND with 100K PD then on port B(B3 and B4) side do we need to provide PU/PD or both side of LS (including A3 and A4) do we need to provide PU/PD?

Thanks

Sagar

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 283720 points

Inputs must never float.

[FAQ] What should be done with unused I/O pins of the level translator devices? recommends grounding (without PD) the I/Os on both sides.

0 Sagar Kumar over 2 years ago in reply to Clemens Ladisch

Prodigy 30 points

Its clear about I/O pins it should be ground. What about DIR3 and DIR4?

0 Reed Smoot over 2 years ago in reply to Sagar Kumar

TI__Prodigy 360 points

Hi Sagar,

Since you are not using channels 3 or 4, I recommend tying those direction pins to ground directly.

Sincerely,

Reed Smoot

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SN74AVC4T774: SN74AVC4T774 unused and DIR pins implementation