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.
Part Number: CD4013B
I have been using CD4013 to control ON & OFF of a specific device. The turning OFF/ON is created by giving a positive edge voltage trigger at the clock pin of the IC. The output of the Q bar is connected to the D input, reset is grounded. This logic is working fine for most of the devices.
In some specific cases, the voltage at the clock pin is drifting which is causing the device to automatically ON/OFF. Can you please explain me the happenings of this?
The clock pin is a high-impedance CMOS input. If the voltage is not valid logic level, then either there is something wrong with the circuit that is driving this signal (please show the schematic), or the input has been damaged (probably by ESD or overvoltage).
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.
In reply to Clemens Ladisch:
We are handling the IC's in an ESD safe environment. Our assumption is that when the IC is assembled on to a board the chances of ESD failures are very less as there can be multiple paths. Is there any chance by which an ESD failure can occur when the IC Is assembled on a PCB?
In reply to Radel Design Team:
The built-in ESD protection is designed to handle ESD that happens during automated assembly. The driving circuit, or overvoltage coming from it, is the much more likely source of the problem. Please show the schematic.
Sorry for the late reply. Here is the schematic :
Unused CMOS inputs must not be left open.
The time constant of the RC filter at the switch is 100 µs. So the rising edge will exceed the trCL limit..
But neither of these is likely to damage the CLK input this way. I'd guess that you are getting ESD when the switch is being touched. Try adding some protection, e.g., series diodes from GND and to VCC, and a resistor in front of CLK.
Thanks Clemens Ladisch!
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.