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SN74LV574A / OE pin connection

S.Satoshi
Guru 21685 points

Hi,

Please let me ask about /OE pin connection and behavior at power-up.

  1. Can you recommend to tie /OE pin to GND?
  2. Please let me know the output state after power-up with tying /OE pin to GND? Is it High, Low or indefinite High/Low?

Best Regards,

Sonoki / Japan Disty

  • 0
    TI__Guru* 97046 points

    Hi Satoshi-san,

    To answer your questions directly:

    1. The /OE pin should be tied to Vcc through a pull-up resistor as mentioned in the datasheet on page 2.

    2. To ensure the high-impedance state during power up/down, /OE should be tied to Vcc.  If the /OE pin is tied to ground, the output is undefined during power-up.

    There is an application note that explains the power-up state of clocked devices such as this here.

  • 0 in reply to Emrys Maier
    Guru 21685 points
    Hi, Emrys,

    Thank you for your comment. Please let me ask again regarding #1.

    Regarding #1, the customer does not need to ensure the high-impedance state during power up. They want to tie /OE pin to GND to simply their circuit. Now I'd like to know if there is possibility of damage by tying /OE pin to GND.

    Regarding #2, I understand that the output is undefined during power-up if the /OE pin is tied to GND.

    Best Regards,
    Sonoki