1) What is the ESD level of ADM2486? Does it pass HBM 1000V or higher than
2) My customer tests with a new part to measure the resistor between Vcc2 and
Gnd2 pins and get 170KOhm, and the resistor between A and B pins is 75KOhm.
Then they power up the part to let it work for a certain time. After that, the
resistor between Vcc2 and Gnd2 pins changes to 20KOhm, and the resistor between
A and B pins changes to 60~40KOhm. Although, the part can still work as normal,
the customer just want to confirm whether this kind of test make sense and why
the resistor value changes.
The ADM2486 ESD level is 1500 V HBM.
In answer to the resistance questions:
- A and B are in high impedance state when the device is powered off, in order
not to interfere with the bus
- Measurements of resistance between Vcc2 and Gnd2 would be different depending
on Vcc2 powered on/off, but the measurements may not be meaningful.