passive-pulldown output

An output similar to an open-circuit except that, in addition to having an internal connection through an active device to a supply voltage, it also has an internal connection through a passive device, usually a resistor, to a second supply voltage that is more negative (less positive) than the first supply voltage.

NOTE According to the state of the active device, the output voltage can swing between levels approaching the two supply voltages.

Graphic symbol (ref. ANSI/IEEE Std 91 and IEC 617‑12):

NOTE The bar above the diamond indicates that the output is at the high logic level when the active device is in its on state.

References