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Do the P_Vio / S_Vio pins control the output voltage or the output driver levels?

April 26, 2017CONTROL driver levels output pins voltage

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Do the P_Vio / S_Vio pins control the output voltage or the output driver levels?

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P_Vio and S_Vio pins at our bridges control “output driving strength”, which is related to current not voltage levels. The V/I curves between 3.3 V signaling and 5V signaling spec differ, and our exact pullup and pulldown curves can be viewed from our IBIS model, where “high drive” is with (P/S)_Vio input of 5V and “low drive” is (P/S)_Vio input of 3.3V.