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SN74AVC4T774: VCCA and VCCB supply voltage

KG
Prodigy 10 points
Part Number: SN74AVC4T774

Hi Team,

From datasheet the typical connection are as below. Where VCCA = 1.8V; VCCB = 3.3V.

Is there any concern if I I connnect VCCA = 3.3V, DIR = 3.3V, VCCB = 1.8V?

  • +1
    TI__Guru* 96591 points

    Hello KG,

    There are basically two questions here:

    (1) Can VCCA > VCCB?

    Yes. From the datasheet feature description section:

    (2) Can DIR inputs be 1.8V with VCCA = 3.3V?

    No. The control inputs must exceed 2V with VCCA = 3.3V to be considered a logic HIGH.