CD4066B: CD4066BM Chip output issue.

Hi Reed,

What does pin 9 output look like? 

If I am understanding this properly, the "bad batch" was removed and replaced with a previous batch; Meaning no alterations, just a drop in replacement and the device worked properly?

Thank you,
Arya 

Hi Arya,

Yes, replacing this batch of products with the previous batch of products will solve the problem without changing any hardware. The output waveform of PIN9 is as follows:

Hi Reed,

I am currently looking into the LOT information on the two batches. In regards to the pictures for pin9 output, you are saying the image on the right is the expected output and the image on the left is the abnormal one?

Thank you,

Arya

Hi Arya,

Yes, The output waveforms measured for two different batches of products are different.

Hi Arya,

Thanks. 

This is a new batch LOT with output issues,

Old batch LOT not found.

Hi Reed,

Thank you for this information. I will update you when I can find more information on this LOT.

Thank you,

Arya

Hi Reed,

I was able to find information on both batches. Was all the devices in the newer batch reel used to see if it all had the same output? 

Thank you,

Arya 

Hi Arya,

Yes, all the new batches have this issue.

Hi Arya,

I am the field team FAE for this customer.

Is there any PCN between these two batches? Since this issue happened to all the new-batch devices. And for the customers, they have 25195pcs new version that they couldn't use. Could you help check their schematic again to confirm if this issue could be solved by changing components?

Best regards,

Winnie

Hi Winnie, 

Ok, I will review the schematic again and get a second opinion.

Thank you,

Arya

Hi Winnie,

I do have some questions regarding the schematic:

1. Is it possible to tie down all the floating I/O pins to prevent potential noise or unwanted behavior?

2. What is the intended function of these control pins with floating I/O connections? Are they being connected to VSS (-8V) elsewhere in the circuit?

3. How are these devices interfacing with the main board? I've noticed Pin 9 appears to simply output the input wave from Pin 8, which suggests the logic might be held high permanently rather than receiving the expected square wave input.

Thank you,

Arya