SLVSJY8 November 2025 THVD4431A
PRODUCTION DATA
THVD4431A has a termination resistor of nominal 120Ω, across R3/R4 in RS-485 mode. Both termination resistors are enabled or disabled using pins as described in Table 7-2. This termination resistor can be enabled or disabled independent of the state of driver or receiver. Termination is OFF in RS-232 loopback, RS-232 3T5R, RS-485 loopback, unpowered and thermal shutdown modes.
| Signal state | Device mode | Function |
|---|---|---|
| TERM = VIO | Half and full duplex mode | 120? enabled between R3 and R4 |
| TERM = GND or floating | Half and full duplex mode | 120? disabled between R3 and R4 |
The on-chip 120? termination resistor is designed for minimum variation across temperature and across common mode voltage on bus pins. The termination block offers a resistive load to the bus, and does not alter the magnitude or phase of the bus signals from DC to 20Mbps signaling. See the typical characteristic curves for variation of termination resistor with voltage and temperature.