If the junction temperature of the device exceeds the thermal shut down threshold, the device turns off the CAN driver circuits thus blocking the TXD to the bus transmission path. The shutdown condition is cleared when the junction temperature of the device drops below the thermal shutdown temperature of the device. If the fault condition that caused the thermal shutdown is still present, the temperature may rise again causing the device to reenter thermal shut down. Prolonged operation with thermal shutdown conditions may affect device reliability. The thermal shutdown circuit includes hysteresis to avoid oscillation of the driver output. This fault is indicated via the TSD flag shown on the nFAULT terminal.