This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hello,Bus-Switch Application: Save bidirectional FPGA I/O pins from too high or too low negative voltages coming from the I/O interface. The Digital Bus Switch Decision Tree in the Digital Bus Switch Selection Guide claims that all listed bus-switch families will clamp undershoots at -0.5V when the switch is on. Is this really true? I thouhgt only the CBTS family has such a feature? Or will the CBTS family already start clamping at -0.3V and all others at -0.5V? Mind: I don't care about undershoot things when the switch is Off. In the application, the switch will always be On. Thanks
All of the switches will have a clamp diode to gnd. The problem with switches is that if you go much below gnd the switch will turn on. (Connect input to output)
We have switches with a C-rev at the end that can prevent turn on.
Buffers would be best for cleaning up overshoot and undershoot.
In reply to Chris Cockrill:
regarding buffers: I would need auto-direction mode, and it seems that these ones are not able to drive some mA and so they don't seem suitable for an I/O interface (card edge). That's why I'm looking at the bus-switches. I think I will spend some extra TVS devices against undershoots along with a bus-switch.
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.