The TUSB2036 hub is a 3.3-V CMOS device that provides up to three downstream ports in compliance with the USB 2.0 specification。 Because this device is implemented with a digital state machine instead of a microcontroller，no firmware programming is required。 Fully-compliant USB transceivers are integrated into the ASIC for all upstream and downstream ports。The downstream ports support both full-speed and low-speed devices by automatically setting the slew rate according to the speed of the device attached to the ports。 The configuration of the BUSPWR terminal selects either the bus-powered or the self-powered mode。 The introduction of the DP0 pullup resistor disable terminal， DP0PUR，makes it much easier to implement an onboard bus/self-power dynamic-switching circuitry。 With the new function terminal， the end-equipment vendor can reduce the total board cost while adding additional product value。

文档内容节选

wwwticom SLLS372F MARCH 2000REVISED SEPTEMBER 2013 23PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE Check for Samples TUSB2036 TUSB2036 Output Terminal Available to Disable External Pullup Resister on DP0 for 3 ms After Reset or After Change on BUSPWR and Enable Easy Implementation of OnBoard BusSelfPower Dynamic Switching Circuitry No Special Driver Requirements Works Seamlessly With Any Operating System With USB Stack Support Available in 32Terminal LQFP Package......