Tool/software:
Hi everyone,
The reason why I'm asking is because the datasheet is a bit vague on that aspect. In table 5.9 the test conditions for the input high and input low voltages are VCC = 3.3V for the logic inputs.
However at the top of that page it states that the table is applicable for both 5V and 3.3V applications. So I just want to make sure, can the UCC21710QDWRQ1 be powered on VCC with 5V, whilst having 3.3V PWM, RDY, FLT and RST#EN signals. Thanks!
Hi Mike,
Yes, you can apply 3.3V logic whilst using a 5V supply. You can refer to the Logic Inputs section of the datasheet for the input thresholds and hysteresis values:
There are other drivers that have supply-referred input thresholds, such as UCC5350M, and you will have to be more careful with this.
Best regards,
Sean
Thanks Sean for your quick support. Yes As Sean noted, 3.3V logic is very close of the threshold limit for 5V supply. However it will be good to be aware that the thresholds are proportional to the supply voltage as shown in recommended conditions section
As the high level input voltage min is 0.7*Vcc, which is 3.5V. Though at room temp, a nominal unit may work well, there is a possibility that at corner condition, it may create issues. So it is recommended to design to follow the min, max conditions.
Thanks
Sasi
