AT89C2051-12SU

{
  "schema_version": 1,
  "type": "component",
  "slug": "at89c2051-12su",
  "title": "AT89C2051-12SU",
  "brief": "Microchip Tech Pre-ordered MCUs, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.1",
  "license": "CC-BY-SA-4.0",
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    "embedded processors & controllers",
    "at89c2051-12su",
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  "component": {
    "mpn": "AT89C2051-12SU",
    "manufacturer": "Microchip Tech",
    "package": "SOIC-20-300mil",
    "pin_count": 20,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Pre-ordered MCUs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/50457c73a99b43f9b2ed97c385bfb4d3.pdf",
    "parts": {
      "symbol": "at89c2051-12su.kicad_sym",
      "footprint": "at89c2051-12su.kicad_mod",
      "model_3d": "at89c2051-12su-hero.glb",
      "model_3d_plain": "at89c2051-12su-etched.glb",
      "model_3d_step": "at89c2051-12su-etched.step",
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      "lbr": "at89c2051-12su.lbr"
    },
    "distributor_links": {
      "lcsc": "C614903",
      "digikey": "AT89C2051-12SU-ND",
      "mouser": "556-A89C205112SU"
    },
    "distributor_check": {
      "checked_at": "2026-11-11T00:42:50Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT89C2051-12SU-ND",
        "status": "found"
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      "mouser": {
        "pn": "556-A89C205112SU",
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    },
    "pins": [
      {
        "number": "1",
        "name": "RST/VPP",
        "type": "input",
        "description": "Reset input: all I/O pins go to 1s as soon as RST goes high, and holding it high for two machine cycles while the oscillator runs resets the device; it is raised to 12 V to enable Flash programming."
      },
      {
        "number": "2",
        "name": "P3.0 (RXD)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O with internal pull-up, alternate function RXD serial input port; output buffers can sink 20 mA."
      },
      {
        "number": "3",
        "name": "P3.1 (TXD)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O with internal pull-up, alternate function TXD serial output port; during programming it is pulled low while busy (RDY/BSY)."
      },
      {
        "number": "4",
        "name": "XTAL2",
        "type": "output",
        "description": "Output from the inverting oscillator amplifier; left unconnected when XTAL1 is driven by an external clock."
      },
      {
        "number": "5",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the inverting oscillator amplifier and to the internal clock operating circuit."
      },
      {
        "number": "6",
        "name": "P3.2 (INT0)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O with internal pull-up, alternate function external interrupt 0; pulsed to program a byte during Flash programming."
      },
      {
        "number": "7",
        "name": "P3.3 (INT1)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O with internal pull-up, alternate function external interrupt 1."
      },
      {
        "number": "8",
        "name": "P3.4 (T0)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O with internal pull-up, alternate function timer 0 external input."
      },
      {
        "number": "9",
        "name": "P3.5 (T1)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O with internal pull-up, alternate function timer 1 external input; pulled low for signature byte reads."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "11",
        "name": "P3.7",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O with internal pull-up; output buffers can sink 20 mA."
      },
      {
        "number": "12",
        "name": "P1.0 (AIN0)",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O that requires an external pull-up; also the positive input (AIN0) of the on-chip analog comparator; output buffers can sink 20 mA and drive LEDs directly."
      },
      {
        "number": "13",
        "name": "P1.1 (AIN1)",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O that requires an external pull-up; also the negative input (AIN1) of the on-chip analog comparator; output buffers can sink 20 mA."
      },
      {
        "number": "14",
        "name": "P1.2",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O with internal pull-up; output buffers can sink 20 mA and drive LEDs directly."
      },
      {
        "number": "15",
        "name": "P1.3",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O with internal pull-up; output buffers can sink 20 mA and drive LEDs directly."
      },
      {
        "number": "16",
        "name": "P1.4",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O with internal pull-up; output buffers can sink 20 mA and drive LEDs directly."
      },
      {
        "number": "17",
        "name": "P1.5",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O with internal pull-up; output buffers can sink 20 mA and drive LEDs directly."
      },
      {
        "number": "18",
        "name": "P1.6",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O with internal pull-up; output buffers can sink 20 mA and drive LEDs directly."
      },
      {
        "number": "19",
        "name": "P1.7",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O with internal pull-up; output buffers can sink 20 mA and drive LEDs directly."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, operating range 2.7 V to 6.0 V."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet gives one pin figure for 20-lead PDIP/SOIC (section 2.1) with no per-package drawing. ; Pin 9 and pin 8 alternate-function labels are printed as '(TO)' in the pin figure; the pin descripti; Port 3 pin P3.6 is not bonded out (internal comparator output) and is not listed in the pin figure, "
        ],
        "pages_sent": 19,
        "cost_usd": 0.0794,
        "at": "2026-11-11T00:42:38"
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        "pages": 19,
        "sha256": "2ef3a172c794a432",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "SOIC-20-300mil",
      "Category": "Embedded Processors & Controllers",
      "Pins": "20"
    },
    "characteristics": {
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      "source": "datasheet",
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      "rows": [
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        {
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        {
          "name": "Input Leakage Current (Port P1.0, P1.1)",
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        {
          "name": "Reset Pull-down Resistor",
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          "unit": "kΩ",
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          "conditions": "Test Freq. = 1 MHz, TA = 25°C",
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          "symbol": "ICC",
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          "name": "Input Data Hold after Clock Rising Edge",
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          "name": "P3.4 (ENABLE) High to VPP",
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