TUSB4020BI Two-Port USB 2.0 Hubs

Texas Instruments' TUSB4020BI are two-port USB 2.0 hubs. They provide USB high-speed/full-speed connections on the upstream port and provide high-speed, full-speed, or low-speed connections on the two downstream ports. When the upstream port is connected to an electrical environment that supports high-speed and full-speed/low-speed connections, high-speed and full-speed/low-speed USB connectivity is enabled on the downstream ports. When the upstream port is connected to an electrical environment that only supports full-speed/low-speed connections, high-speed connectivity is disabled on the downstream ports.

The TUSB4020BI support per port or ganged power switching and over-current protection.

Individual port-power-controlled hub switches power on or off to each downstream port as requested by the USB host. Also when an individual port-power-controlled hub senses an over-current event, only power to the affected downstream port will be switched off.

A ganged hub switches on power to all its downstream ports when power is required to be on for any port. The power to the downstream ports is not switched off unless all ports are in a state that allows power to be removed. Also when a ganged hub senses an over-current event, power to all downstream ports will be switched off.