DRV8245-Q1: Reset pulse on nSLEEP

Hello,

I'm trying to use the DRV8245 in an application without a microcontroller and solve the pulse on nSLEEP with an NE555. The pulse width is OK at approx. 30µs. However, I still cannot activate the bridge.
I'm not sure when this pulse needs to happen. Is the time critical when it occurs after voltage is applied?

Thanks for your help!