UC2875: DWP Package: Slope Pin 26

Did you measure the resistance between two pins without powering IC? Why is the resistance important? It is not a datasheet parameter.

We will get back to you on the tolerance soon.

Can you clarify the test condition? what is the voltage you are forcing when measure the resistance?

Please also share the LTC with us so we can look into this in detail. We need both 230k and 207k samples

The resistance was measured without powering the IC.

The resistance value is important as this simple check has indicated a pass or fail with our internal testing.

The 230k LTC was 47Z228V and the 207k was 37Z17RV.

what is the test condition? can you share?

There is a 174k pull up resistor connected between pin 26 and pin 15 of the IC. The pull up resistor measures ~8% lower than expected. It was confirmed that the resistor itself is not an issue.

Can you share the bias condition when you measure the resistance? are you using multimeter to measure the resistance between pin 26 and GND, which means the voltage on pin26 is unknown? pin15 is Vin. I thought Vin is not powered. Why would that pull up resistor impact the resistance between pin 26 and GND?

Yes, the resistance value was measured using a multimeter with + on pin 26. The value of the pull up resistor does not impact the resistance between pin 26 and GND. For a bit more context, we measure the pull up resistor (~174k). When UC2875DWP LTC 47Z228V is installed, the pull up resistor reads ~174k (pass). When LTC 37Z17RV is installed the pull up resistor reads ~8% less ("fail"). Taking a look at UC2875DWP, it was noticed that when the test "failed" it had a lower reading between pin 26 and GND, swapping the IC caused the resistor to read ~174k. The thought was there might be some variance on the input of pin 26, but are unsure what is an allowable variance/tolerance.