Part Number: ISO7741-Q1
Good morning team,
I am working on an application with ISO7741-Q1 and ISO7721-Q1. In this system, during sleep mode, the supplies will be turned off and some of the input/output digital isolator pins will be pulled to +5V. In this case, is there a possibility of the input/output signal voltages feeding back to VCC1/VCC2 through the device's internal circuitry?
Thank you for sharing details regarding your query.
As mentioned in datasheet section 8.4.1, all I/O pins have protection diodes that bypass higher input voltage (INx > [VCC+0.5V]) to its supply. Hence device can potential power up from device I/O pin if the voltage exceeds supply voltage.
These protection diodes are designed to protect against ESD and are not meant for continuous voltage operation. Hence I do not recommend operating device in such conditions.
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. 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 respect to these materials. 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.