When a timeout condition occurs, the I2CALERT terminal is pulsed low for 200 μs. A timeout condition is defined as per SMBUS 2.0, t_TIMEOUT. In addition to SCL, a timeout condition also occurs when the SDA line is asserted low. If the timeout condition persists, I2CALERT continues to pulse every t_TIMEOUT. The TPS65400 never intentionally pulls the SCL low beyond t_LOW:SEXT⁽¹⁾, as that violates timing specifications. Therefore, the I2CALERT terminal acts as a watchdog for other devices sharing the same bus that violate the cumulative clock low extend time. On a system level, it can be seen as a non-maskable interrupt (NMI) signal for the I²C bus.