{"schemaVersion":1,"slug":"power-rail-sequencer","name":"Power-rail sequencer","kind":"symbol","abbreviation":"SEQ","aliases":["Power-rail sequencer","Power-rail sequencer functional block","Power-rail sequencer schematic reference"],"category":"logic-signals","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"A power sequencer controls the order in which selected supply rails are enabled or disabled.","description":["A power sequencer controls the order in which selected supply rails are enabled or disabled.","A controller board can bring its supplies up in the order required by its devices.","Show each rail-enable output and any feedback used to decide the next step. An ordered command is different from proof that a supply reached its intended condition. The drawing should therefore distinguish the requested sequence, actual rail voltages and the status inputs used by the controller. This is original functional artwork, not a certified standard graphic or device pinout."],"readingNotes":["Identify each controlled rail and enable output.","Show feedback used to advance or stop the sequence.","Reference startup, shutdown and fault sequencing.","An ordered enable signal does not itself prove that a rail reached its intended voltage."],"drawingChecklist":["Identify each controlled rail and enable output.","Show feedback used to advance or stop the sequence.","Reference startup, shutdown and fault sequencing."],"distinction":"An ordered enable signal does not itself prove that a rail reached its intended voltage.","facts":[{"label":"Representation type","value":"Original functional block; not a certified IEC or IEEE graphic"},{"label":"Concept input","value":"Start and supply-status inputs"},{"label":"Concept output","value":"Ordered rail-enable outputs"}],"references":[{"sourceId":"expansion-20261027-sequencer","relevance":"Power supply sequencing: public technical context for the named function. Product and compliance details remain with the publisher."}],"related":["plc-io","power-rail-enable-interface","power-converter","terminal"],"artwork":"expanded-power-rail-sequencer","publishedOn":"2026-10-27","updatedOn":"2026-10-27","provenance":"independent-public-research","plainEnglish":{"title":"What does Power-rail sequencer mean?","introduction":"A power sequencer controls the order in which selected supply rails are enabled or disabled.","example":"A controller board can bring its supplies up in the order required by its devices.","drawings":"Show each rail-enable output and any feedback used to decide the next step. An ordered command is different from proof that a supply reached its intended condition. The drawing should therefore distinguish the requested sequence, actual rail voltages and the status inputs used by the controller.","terms":[{"name":"Rail","meaning":"A named supply connection or voltage domain."},{"name":"Sequence","meaning":"The defined order and conditions of the controlled actions."}],"diagram":"flow","caption":"Original functional explanation. Arrows show information or energy roles; two-headed arrows identify two-way interfaces. This is not a pinout, certified standards graphic or complete circuit.","sources":[{"label":"Power supply sequencing","url":"https://www.ti.com/product-category/power-management/sequencers/overview.html"}],"profileId":"researched-functional-reference","checklist":["Identify each controlled rail and enable output.","Show feedback used to advance or stop the sequence.","Reference startup, shutdown and fault sequencing."],"questions":[{"question":"Does enabling rail two prove rail one is ready?","answer":"Only if the selected sequence actually checks the required condition. A timed command alone and a feedback-qualified sequence provide different information, so show the implemented control method."}],"steps":["Start and supply-status inputs","Rail sequencing control","Ordered rail-enable outputs"],"bidirectional":false},"url":"https://eloragrid.ai/symbols/power-rail-sequencer","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/power-rail-sequencer.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"expansion-20261027-sequencer","title":"Power supply sequencing","publisher":"Texas Instruments","url":"https://www.ti.com/product-category/power-management/sequencers/overview.html","type":"manufacturer","scope":"Public functional documentation. Original explanatory text and educational block artwork; no publisher graphics or files reproduced.","checkedOn":"2026-10-27","reuse":"link-only","relevance":"Power supply sequencing: public technical context for the named function. Product and compliance details remain with the publisher."}]}