SFFS780 February 2024 TUSB4020BI-Q1
The failure mode distribution estimation for the TUSB4020BI-Q1 in Table 3-1 comes from the combination of common failure modes listed in standards such as IEC 61508 and ISO 26262, the ratio of sub-circuit function size and complexity, and from best engineering judgment.
The failure modes listed in this section reflect random failure events and do not include failures resulting from misuse or overstress.
| Outputs of the TUSB4020BI-Q1 | Function | Die Failure Modes | Failure Mode Distribution (%) |
|---|---|---|---|
| USB2 Upstream | Communication | Upstream communication error | 18 |
| USB Downstream 1 | Communication | Downstream 1 communication error | 18 |
| USB Downstream 2 | Communication | Downstream 2 communication error | 18 |
| Both USB Downstream 1 and 2 | Communication | Both downstream 1 and 2 communication error | 2 |
| USB Downstream 1 | Charging control | Downstream 1 charging error | 14 |
| USB Downstream 2 | Charging control | Downstream 2 charging error | 14 |
| Both USB Downstream 1 and 2 | Charging control | Both downstream 1 and 2 charging error | 2 |
| I2C/SMBus | Communication | I2C/SMBus control communication error | 14 |