Surge protection for differential input / output interfaces Surge protection

摘要

The integrated circuit device (200) includes first and second differential I / O pins (TRXP / TRXN) and a surge protection circuit (400). The surge protection circuit (400) includes a protection transistor (MN0), a positive polarity surge detection circuit (510), and a negative polarity surge detection circuit (520). The protection transistor is connected between the first and second I / O pins and has a gate for receiving a control signal (CTRL). The protection transistor has a negative polarity surge detection circuit that detects positive polarity surge energy at either of the I / O pins and / or a negative polarity surge detection circuit at either of the I / O pins. In the event of detection of sexual surge energy, it is turned on to connect the I / O pins together.