公开(公告)号：US11626876B2

公开(公告)日：2023-04-11

申请号：US17393844

申请日：2021-08-04

Applicant: Rambus Inc.

Inventor： Panduka Wijetunga ,  Dhiraj Kumar

IPC: H03K19/007 ,  H03K19/003

Abstract: Push-pull integrated circuit output drivers may interfere with communication by other entities on a bus when an integrated circuit is powered down. When there is no power and/or when the bonding pad is externally driven above the internal supply voltage, the substrate/body/well of the p-channel field effect transistor (PFET) of the output driver is biased to prevent its drain diode from becoming forward biased thereby preventing interference with communication on the bus. Also, when there is no power, driver is powered down or pull up is disabled, the gate of the driver PFET is driven to a voltage that ensures the driver PFET remains off when the bonding pad is externally driven above the internal supply voltage.