{"schemaVersion":1,"slug":"ansi-wired-and-connection","name":"ANSI wired-AND connection","kind":"symbol","abbreviation":"WIRED-AND","aliases":["dot-AND","wired-AND bus","open-collector shared line"],"category":"logic-signals","drawingTypes":["Schematic"],"referenceFamilies":["IEEE / ANSI","Manufacturer"],"summary":"Several open-collector outputs joined on one pulled-up line, so any output pulling low makes the line low.","description":["A wired-AND connection is formed by joining open-collector or open-drain outputs to a single line with one pull-up. The line is high only when every output is off, so in positive logic the result is the AND of the individual output states. Some schematics draw a small AND outline around the junction to make the implied function visible.","Shared interrupt lines, ready signals and I2C-style buses rely on this arrangement. A drawing should show every output on the net, the single pull-up, and the supply, because adding or removing a driver changes the logic and the pull-up current.","The connection only works with open-circuit outputs. Joining push-pull outputs in the same way causes contention and possible damage, so the output type of each gate must be checked."],"readingNotes":["Check that every joined output is open collector or open drain.","There should be one pull-up for the whole net."],"drawingChecklist":["Show all contributing outputs on the shared net.","Draw a single pull-up with its value and supply.","Mark the open-circuit output type on each driver."],"distinction":"A wired-OR uses open-emitter outputs with a pull-down; wired-AND uses open-collector outputs with a pull-up.","facts":[{"label":"Required output type","value":"Open collector or open drain"},{"label":"Resulting function","value":"AND in positive logic"},{"label":"Artwork scope","value":"Original educational illustration; consult the applicable standard and the selected device documentation for the exact graphic"}],"references":[{"sourceId":"s28-ti-ieee91-logic-symbols","relevance":"States that open-collector outputs are capable of positive-logic wired-AND connection."},{"sourceId":"s28-ti-hc05","relevance":"Manufacturer open-drain output documentation."}],"related":["open-collector-buffer","ansi-open-collector-inverter","iec-open-circuit-output-l-type"],"artwork":"s28-ansi-wired-and-connection","publishedOn":"2026-10-28","updatedOn":"2026-10-28","provenance":"independent-public-research","symbolVariant":{"convention":"IEEE / ANSI","form":"Open-collector outputs joined to a common pulled-up line","reference":"Distinctive-shape form as used in IEEE/ANSI-style schematics and manufacturer data books. Independent educational drawing; exact standard geometry and compliance are not asserted."},"plainEnglish":{"title":"What does ANSI wired-AND connection mean?","introduction":"A wired-AND connection is formed by joining open-collector or open-drain outputs to a single line with one pull-up. The line is high only when every output is off, so in positive logic the result is the AND of the individual output states. Some schematics draw a small AND outline around the junction to make the implied function visible.","example":"Shared interrupt lines, ready signals and I2C-style buses rely on this arrangement. A drawing should show every output on the net, the single pull-up, and the supply, because adding or removing a driver changes the logic and the pull-up current.","drawings":"The connection only works with open-circuit outputs. Joining push-pull outputs in the same way causes contention and possible damage, so the output type of each gate must be checked.","terms":[{"name":"Terminal","meaning":"An identified point where a conductor connects."},{"name":"Signal","meaning":"Electrical information passed between devices, rather than necessarily the main power supply."},{"name":"Rating","meaning":"A value stating the conditions for which equipment is specified."}],"diagram":"flow","steps":["Identify the device and form","Read the connections and state","Check the equipment reference"],"caption":"A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram.","sources":[{"label":"Overview of IEEE Standard 91-1984: explanation of logic symbols (SDYZ001A)","url":"https://www.ti.com/lit/ml/sdyz001a/sdyz001a.pdf"},{"label":"SNx4HC05 hex inverters with open-drain outputs","url":"https://www.ti.com/lit/ds/symlink/sn74hc05.pdf"}],"detail":"Several open-collector outputs joined on one pulled-up line, so any output pulling low makes the line low. A wired-OR uses open-emitter outputs with a pull-down; wired-AND uses open-collector outputs with a pull-up.","profileId":"reviewed-symbol-20261028"},"url":"https://eloragrid.ai/symbols/ansi-wired-and-connection","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/ansi-wired-and-connection.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"s28-ti-ieee91-logic-symbols","title":"Overview of IEEE Standard 91-1984: explanation of logic symbols (SDYZ001A)","publisher":"Texas Instruments","url":"https://www.ti.com/lit/ml/sdyz001a/sdyz001a.pdf","type":"manufacturer","scope":"Public explanation of rectangular logic symbols, general qualifiers, input and output qualifiers, dependency notation, bistable elements and coders, consistent with IEC 617-12 work.","checkedOn":"2026-10-28","reuse":"link-only","relevance":"States that open-collector outputs are capable of positive-logic wired-AND connection."},{"id":"s28-ti-hc05","title":"SNx4HC05 hex inverters with open-drain outputs","publisher":"Texas Instruments","url":"https://www.ti.com/lit/ds/symlink/sn74hc05.pdf","type":"manufacturer","scope":"Device documentation for inverters with open-drain outputs.","checkedOn":"2026-10-28","reuse":"link-only","relevance":"Manufacturer open-drain output documentation."}]}