Intel® Agilex™ General-Purpose I/O and LVDS SERDES User Guide

ID 683780
Date 10/29/2021

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2.2.3. Programmable Open-Drain Output

Intel® Agilex™ devices support open-drain output on 1.2 V LVCMOS I/O standard. The programmable open-drain output provides a high-impedance state on output when logic to the output buffer is high. If logic to the output buffer is low, the output is low.

You can attach several open-drain outputs to a wire. This connection type is like a logical OR function and is commonly called an active-low wired-OR circuit. If at least one of the outputs is in logic 0 state (active), the circuit sinks the current and brings the line to low voltage.

You can use open-drain output if you are connecting multiple devices to a bus. For example, you can use the open-drain output for system-level control signals that can be asserted by any device or as an interrupt.

Do not pull the output voltage higher than the VI (DC) level.

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