These devices are designed to operate in hot swap or hot pluggable applications. Key features for hot-pluggable applications are:

• Power-up
• Power-down glitch-free operation
• Default disabled input/output pins
• Receiver failsafe

As shown in Figure 7-9, an internal power-on reset circuit keeps the driver outputs in a high-impedance state until the supply voltage has reached a level at which the device reliably operates. This ensures that no spurious bits are transmitted on the bus pin outputs as the power supply turns on or turns off.

As shown in the Section 8.4, the enable inputs have the feature of default disable on both the driver enable and receiver enable. This ensures that the device neither drives the bus nor reports data on the R pin until the associated controller actively drives the enable pins.