Part Number: SN74LVC1T45
Our customer is using a SN74LVC1T45 to drive an input to us which we have pulled up through a 49.9K to 3.3V and goes to a FET gate. They are concerned that our pull-up can back drive their transceiver when they are powered down and cause it to power up and latch the output low. I don't believe this is a real concern, but I'm trying to get some confirmation of whether this is a concern or not. Any help is greatly appreciated.
This FAQ should clear up the concern here.
Check out our new AXC family of Voltage Translators!
Watch the Introduction to AXC Family to find out more about the family.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
This FAQ discusses Ioff for partial power down where only one of the supplies is on and if you backdrive the device. Does this still apply if both supplies are off? If both supplies are off and I back drive the output with 3.3V then is the output still high Z with an Ioff maximum current draw of only 2uA?
In reply to Jeremy Richardson:
Yes, this applies when both supplies are off. From the datasheet EC table:
The highlighted values are for the V_CCA and V_CCB columns.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.