Part Number: SN74LVC1G123
My customer is evaluating SN74LVC123 and encountering a problem.
I would be grateful if you could advise.
In SN74LVC1G123DCUR, one pulse signal of about 80ms is output from output terminal Q at 0.93V
on the way from Vcc = 0V to 5V.
(In the system, the circuit in the subsequent stage will operate due to the influence of the output signal.)
(1)Could you please let us know the cause of the phenomenon.
(2)We'd like to know how the risig and falling edge of the A, B and CLR determined.
Could you please see the waveform and schematic.
Question about SN74LVC1G123DCUR.xlsx
According to the Function Table, a pulse may be output when the IC_B or CLR transitions from L to H.
However, 0.93V is out of the operating rating.
We are looking forward to waiting your advice.
I appreciate your great help in advance.
Thanks for the details you provided. This device should have a clear circuit to keep the output from powering up High. Can you test without the output load? Also can you add a scope channel to the Rext/Cext pin?
What is happening to the A input? I don't see what its all connected, but what I can see is an RC circuit connected between it and Vcc so I wouldn't expect it to track the supply like it does.
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.
In reply to Dylan Hubbard:
Thank you for your reply.
I'll confirm with the customer about your comment.
When I get information, I'll feedback to you.
I appreciate your great help and cooperation.
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.