SN74LS90DR

{
  "slug": "sn74ls90dr",
  "version": "0.1.0",
  "type": "component",
  "description": "Texas Instruments Counters, Dividers, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "logic",
    "sn74ls90dr",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "sn74ls90dr.kicad_sym",
    "sn74ls90dr.kicad_mod",
    "sn74ls90dr.glb",
    "sn74ls90dr.step",
    "sn74ls90dr.lbr",
    "docs/hero.png",
    "docs/sn74ls90dr-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "sn74ls90dr-hero.glb",
    "sn74ls90dr-hero.overlay.json"
  ],
  "component": {
    "mpn": "SN74LS90DR",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-14",
    "pin_count": 14,
    "category": "Logic",
    "subcategory": "Counters, Dividers",
    "datasheet": "https://www.ti.com/lit/ds/symlink/sn74ls90.pdf",
    "parts": {
      "symbol": "sn74ls90dr.kicad_sym",
      "footprint": "sn74ls90dr.kicad_mod",
      "model_3d": "sn74ls90dr-hero.glb",
      "model_3d_plain": "sn74ls90dr.glb",
      "model_3d_step": "sn74ls90dr-etched.step",
      "model_3d_step_plain": "sn74ls90dr.step",
      "lbr": "sn74ls90dr.lbr"
    },
    "distributor_links": {
      "lcsc": "C1848241",
      "digikey": "296-SN74LS90DRTR-ND",
      "mouser": "595-SN74LS90DR"
    },
    "distributor_check": {
      "checked_at": "2026-10-08T00:50:08Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "296-SN74LS90DRTR-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "595-SN74LS90DR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "CKB",
        "type": "input",
        "description": "Clock input B for the divide-by-five section, advancing on the high-to-low transition; connect to QA for full decade count."
      },
      {
        "number": "2",
        "name": "R0(1)",
        "type": "input",
        "description": "Gated zero-reset input 1; with R0(2) both high resets the counter to zero."
      },
      {
        "number": "3",
        "name": "R0(2)",
        "type": "input",
        "description": "Gated zero-reset input 2; with R0(1) both high resets the counter to zero."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "5",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply voltage."
      },
      {
        "number": "6",
        "name": "R9(1)",
        "type": "input",
        "description": "Gated set-to-nine input 1; with R9(2) both high sets the outputs to BCD nine."
      },
      {
        "number": "7",
        "name": "R9(2)",
        "type": "input",
        "description": "Gated set-to-nine input 2; with R9(1) both high sets the outputs to BCD nine."
      },
      {
        "number": "8",
        "name": "QC",
        "type": "output",
        "description": "Counter output C of the divide-by-five section."
      },
      {
        "number": "9",
        "name": "QB",
        "type": "output",
        "description": "Counter output B of the divide-by-five section."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "11",
        "name": "QD",
        "type": "output",
        "description": "Counter output D, the most significant bit of the divide-by-five section."
      },
      {
        "number": "12",
        "name": "QA",
        "type": "output",
        "description": "Counter output A of the divide-by-two section."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "No internal connection."
      },
      {
        "number": "14",
        "name": "CKA",
        "type": "input",
        "description": "Clock input A for the divide-by-two section, advancing on the high-to-low transition; count pulses are applied here."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The text pages give no electrical limits or detailed pin descriptions, so the descriptions come from",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 27,
        "cost_usd": 0.3798,
        "at": "2026-10-08T00:49:52"
      },
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/sn74ls90.pdf",
        "pages": 27,
        "sha256": "43d2e13b0f0e6ce2",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 14,
        "described": 14,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "sn74ls90dr.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          8.7,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "sn74ls90dr-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.0,
          8.7,
          1.75
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "c1e3efdac96b9178e2a8974446b6efd4dd769a0d8c915a6eec8924004140a7ee",
        "checked": "2026-10-08",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}