SN74LVC8T245: The datasheet revC.

Kengo.Y

Part Number: SN74LVC8T245
Other Parts Discussed in Thread: SN74LXC8T245

Hi team,

The DS has been revised and the following text added at the power supply recommendation section.

>The recommendation is to first power-up the input supply rail to help avoid internal floating while the output supply rail ramps up. However, both power-supply rails can be ramped up simultaneously.

Does this lead to abnormal behavior if not followed?
We have been using it and need to change the design to comply with this.

BR.
Kengo.

over 1 year ago

+1 Clemens Ladisch over 1 year ago

Guru 317080 points

I'd guess similar effect as described in [FAQ] How does a slow or floating input affect a CMOS device?

The simplest change is to use the SN74LXC8T245 instead.

+1 Michael Ikwuyum over 1 year ago

TI__Guru 51346 points

Hi Kengo,

In addition to Clemens' feedback, the abnormal behavior that may occur is for the state of the outputs during power up i.e mainly during power up (which can be a quick glitch without damages) and once fully powered up, no concerns.

Hence, if you have been using it outside the recommendation and have not cared much about the state of the outputs during power up, you may continue to do so or may also use the LXC recommendation, thanks.

Best Regards,

Michael.

Logic

Logic forum

SN74LVC8T245: The datasheet revC.