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DRV8871: The maximum rise time and fall time of IN1/2(logic input)

Tao_2199
Genius 5770 points
Part Number: DRV8871

Hello,

 

Regarding to IN1/2(logic input) on DRV8871, my customer is asking a question.

(Question)

･How is rise time and fall time in IN1/2?

I am understanding that generally, the maximum rise time and fall time of CMOS logic(Vcc5V) are approximately 20ns/V.

Is it same as above value?

They use very slow rise time and fall time(20us~) signal as IN1/2 and they are facing the anomalous oscillation on this device output.

 

Regards,

Tao2199

  • 0
    TI__Guru** 114905 points
    Hi Tao2199,

    We expect the inputs to be controlled by an mcu, which has outputs in the 20ns/V range.

    What type of anomalous oscillation is observed? This could be due to noise causing the inputs to switch between a logic low and logic high when the input is between 0.5V and 1.5V.