In my datasheet are under "Absolute Max. Ratings" two items that might apply.
first: DC voltage applied to oputputs in Hig-Z : -0.5V to Vcc +0.5V. In your case Vcc is 0V
second: DC voltage to any input pin with a note #15 saying DO NOT POWER I/O WHITH CHIP POWER OFF
So you are on rough, not on fairway.
Yes. You should not power I/Os with out powering the chip.
Thank you all.
Trying to get some more detail on what "Do not power the I/O without powering the 68013" actually means.
We are using the 68013a as a usb to parallel port adapter for a specific legacy product. I am in the process of cleaning up the design, and there is a transistor setup to pull up the Data lines after the chip comes up. What about when the chip is connected (As a product) to a parallel port, would this also be a problem, and if so, how would one over come the issue?
Trying to understand why the I/O lines can't be powered (other than the obvious) or what kind of powering can they take .