SN74AVC2T245: any risk to connect OE pin to ground directly?

Yangbo

Part Number: SN74AVC2T245

Hi,

There is no IO available to control the OE pin of SN74AVC2T245. So i am wondering if it is OK to connect OE pin to ground directly. Is there any risk? A port is 1.8V and B port is 3.3V.

Regards,

Yangbo

over 5 years ago

0 Clemens Ladisch over 5 years ago

Guru 318700 points

The datasheet says:

To ensure the high-impedance state during power up or power down, OE must be connected to V_CC through a pull-up resistor.

If you do not care about the state of the I/O pins during power up or power down, then you can connect OE directly to ground.

0 jack rao over 5 years ago

Prodigy 100 points

yes you can directly connect OE pin to ground but the better way is you can use 1k resistor OR 100r resistor in the series of ground . like as pullup down

0 Yangbo over 5 years ago in reply to jack rao

TI__Intellectual 1690 points

Hi Jack,

Thanks.

Why do you recommend to add a resistor? what is that for?

0 jack rao over 5 years ago in reply to Yangbo

Prodigy 100 points

Because datasheet says{

To ensure the high-impedance state during power up or power down, OE must be connected to V_CC through a pull-up resistor.}

it better that you use a resistor because when you get power your ic high-impedance state during power up or power down

as safety you must use a resistor in series it is also called pull-up or pull-down

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SN74AVC2T245: any risk to connect OE pin to ground directly?