| Pin Name | 1/0 | Buffer Type | Active Level | Function |
| X1 CLK | I | 2.5V Input | | Crystal oscillator in or clock input |
| X2 | O | 2.5V Output | | Oscillator out |
| SYSRSTB | I | 5 V tolerant Schmitt Input | Low | Asynchronous chip reset |
| RPU | A (0) | USB Pull-up control | | External l.5 kQ pull-up resistor control |
| DP(7:1) | 1/0 | USB D+ signal l/0 | | USB's downstream facing port D+ signal |
| DM(7:1) | I/O | USB D- signall/0 | | USB's downstream facing port D- signal |
| DPU | 1/0 | USB D+ signall/0 | | USB's upstream facing port D+ signal |
| DMU | I/O | USB D- signall/0 | | USB's upstream facing port D- signal |
| LPWRM | I | 3.3 V Schmitt Input | | Local power monitor |
| RREF | A (0) | Analog | | Reference resistor |
| CSB(7:1) | I | 5 V tolerant Input | Low | Port's over-current status input |
| PPB(7:1) | O | 5 V tolerant N-ch open drain | Low | Port's power supply control output |
| VBUSM | I | 5 V tolerant Schmitt input | | VBUS monitor |
| SCL | 0 | 3.3V Output | | External serial ROM clock out |
| SDA/GANG B | 1/0 | 3.3 V Schmitt l/0 | | External serial ROM data 10 0r power management mode select |
| EXROM EN | I | 3.3 V Schmitt Input | | External serial ROM input enable |
| TEST | l | 3.3V Input | | Test signal |
| SCAN MODE | I | 3.3V Input | | Test signal |
| VDD33 | | | | 3.3V Voo |
| VDD25 | | | | 2.5V VDD |
| AVDD | | | | 2.5 V VDD for analog circuit |
| Vss | | | | Vss |
| AVss | | | | Vss for analog circuit |
| AVss(R) | | | | Vss for reference resistor. Connect to AVss. |
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