ZHCSQ45A january 2023 – july 2023 THVD1454
PRODUCTION DATA
THVD1454 has in-built protection features such as supply undervoltage, bus short circuit and thermal shutdown.
Supply undervoltage protection is present on VCC supply. This maintains the bus output and receiver logic output in known driven state when the supply is above the rising undervoltage threshold. Table 8-5 describes the device behavior in various scenarios of supply levels.
| VCC | Driver Output | Receiver Output | Termination across bus pins AB |
|---|---|---|---|
| > UVVCC(rising) | Determined by DE and D inputs | Determined by RE and A-B | Determined by TERM pin |
| < UVVCC(falling) | High impedance | Undetermined | OFF |
Bus terminals are protected against high voltage short circuit events up to ± 16 V. Additionally, bus short circuit current is limited to 250 mA. In events like bus contention when multiple drivers are driving the bus simultaneously, the current through the bus terminals is internally limited. If the power dissipation makes the junction temperature cross 150°C, thermal shutdown is activated which disables the driver and receiver and reduces the on-chip power dissipation. The device is enabled once the junction temperature falls by the thermal shutdown hysteresis as specified in electrical parameter section of the data sheet.