SDLS967H may 2016 – july 2023 LSF0108-Q1
PRODMIX
For the bidirectional clamping configuration (higher voltage to lower voltage or lower voltage to higher voltage), the EN input must be connected to Vref_B and both pins pulled to HIGH side VCCB through a bias resistor (typically 200 kΩ). This allows Vref_B to regulate the EN input. A filter capacitor on Vref_B is recommended. The controller output driver can be push-pull or open-drain (pull-up resistors may be required) and the peripheral device output can be push-pull or open-drain (pull-up resistors are required to pull the Bn outputs to VPU).
Figure 9-1 shows how the reference supply voltage Vref_A is connected to the processor core power supply at 1.8 V and Vref_B is connected through a 200 kΩ resistor to a 5 V power supply. The output of A3 and B4 has a maximum output voltage equal to Vref_A, and the bidirectional interface (Ch5/6, MDIO, MDC) has a maximum output voltage equal to Vpu.