Figure 9-1 shows that the SN74CB3Q3305 can be used as bidirectional switch. The controller operates at 5 V and the peripheral can accept 5 V. Even with a V_CC of 3 V on the SN74CB3Q3305, the two ports can be connected to pass the 5 V signal. The controller uses the OE pin control the switch. This is a very generic example and could apply to many situations. For applications that require only 1 bit (for example, one channel), tie the unused OE low and tie the unused ports A and B to either high or low (not shown).