I would like to have the rise and fall transition rate specification clarified. This item is found in the recommended operating conditions section and is defined as a max of 100ns/V. Can you verify that this is means, in my own words, that the transition time from low to high must be faster than 100ns/V? What will the part do (or not do) if the transition time is slower than 100ns/V?
The value shown in the datasheet is the MAXIMUM transistion time for the two input pins. It is probably easier to think of the reciprical of this value which would then be the MINIMUM slew rate for the input pins. The minimum slew rate is 1V/us. The slew rate must be higher than this in order for the device to recognize the input. If the slew rate is too slow then the device may not recognize the /MR or WDI inputs and issue false resets or no reset at all.
I was going to post a similar question on the TPS3801 until I found this post and reply.
I don't get it. These are power supply supervisors with reset. Why is the maximum input transition rise time 100 ns/V?
On page one of the data sheet under "typical application" it shows a push button switch going directly to MR. How can this possibly be 100 ns/V max? Its an input switch. Am I misinterpreting the data sheet?
Thanks,
Loren Hunt
Yes, the same answer applies to the TPS3801 as well.
ALL CONTENT AND MATERIALS ON THIS SITE ARE PROVIDED "AS IS". TI AND ITS RESPECTIVE SUPPLIERS 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.
Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI and its suppliers reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.