| 摘要 |
An electrostatic discharge (ESD) switch circuit (100, 200) for an integrated circuit (IC) with multiple power inputs for improving pin-to-power isolation of the IC. The IC includes first and second positive power pins (TX VCC, RX VCC) and a corresponding first and second negative power pins (TX GND, RX GND). The IC also includes an ESD ring network with a high ESD bus and a low ESD bus. The IC further includes a control circuit indicating one of several operational modes. The ESD switch circuit (101, 201) includes a first switch circuit that couples the high ESD bus to the first positive power pin in a first operational mode and that couples the high ESD bus to the second positive power pin in a second operational mode. The ESD switch circuit further includes a second switch circuit that couples the low ESD bus to the first negative power pin in the first operational mode and that couples the low ESD bus to the second negative power pin in the second operational mode. When power is removed or when the IC is disconnected from other circuitry, the switch circuit disconnects the power inputs from the ESD buses so that ESD conduction operates as normal. |
