AT89C4051-12PU

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  "type": "component",
  "slug": "at89c4051-12pu",
  "title": "AT89C4051-12PU",
  "brief": "Microchip Tech Pre-ordered MCUs, PDIP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.2",
  "license": "CC-BY-SA-4.0",
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  "component": {
    "mpn": "AT89C4051-12PU",
    "manufacturer": "Microchip Tech",
    "package": "PDIP-20",
    "pin_count": 20,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Pre-ordered MCUs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/32518bbd29f048caa64e52b063a36c82.pdf",
    "parts": {
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      "lbr": "at89c4051-12pu.lbr"
    },
    "distributor_links": {
      "lcsc": "C613480",
      "digikey": "AT89C4051-12PU-ND",
      "mouser": "556-A89C405112PU"
    },
    "distributor_check": {
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    },
    "pins": [
      {
        "number": "1",
        "name": "RST/VPP",
        "type": "input",
        "description": "Reset input: holding RST high for two machine cycles while the oscillator runs resets the device, and it is raised to 12V to enable Flash programming."
      },
      {
        "number": "2",
        "name": "P3.0 (RXD)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O pin with internal pullup that serves as the serial input port RXD."
      },
      {
        "number": "3",
        "name": "P3.1 (TXD)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O pin with internal pullup that serves as the serial output port TXD, and is pulled low to indicate BUSY during programming."
      },
      {
        "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 pin with internal pullup that serves as external interrupt 0 and is pulsed to program a byte during Flash programming."
      },
      {
        "number": "7",
        "name": "P3.3 (INT1)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O pin with internal pullup that serves as external interrupt 1 and is used for programming control."
      },
      {
        "number": "8",
        "name": "P3.4 (T0)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O pin with internal pullup that serves as the external input to timer 0 and is used for programming control."
      },
      {
        "number": "9",
        "name": "P3.5 (T1)",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O pin with internal pullup that serves as the external input to timer 1 and is used for programming control."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "11",
        "name": "P3.7",
        "type": "bidirectional",
        "description": "Port 3 bidirectional I/O pin with internal pullup that is also used for Flash programming and verification control."
      },
      {
        "number": "12",
        "name": "P1.0 (AIN0)",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O pin that requires an external pullup, sinks up to 20 mA, and serves as the positive input of the on-chip analog comparator."
      },
      {
        "number": "13",
        "name": "P1.1 (AIN1)",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O pin that requires an external pullup, sinks up to 20 mA, and serves as the negative input of the on-chip analog comparator."
      },
      {
        "number": "14",
        "name": "P1.2",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O pin with internal pullup whose output buffer can sink 20 mA and drive LED displays directly."
      },
      {
        "number": "15",
        "name": "P1.3",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O pin with internal pullup whose output buffer can sink 20 mA and drive LED displays directly."
      },
      {
        "number": "16",
        "name": "P1.4",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O pin with internal pullup whose output buffer can sink 20 mA and drive LED displays directly."
      },
      {
        "number": "17",
        "name": "P1.5",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O pin with internal pullup whose output buffer can sink 20 mA and drive LED displays directly."
      },
      {
        "number": "18",
        "name": "P1.6",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O pin with internal pullup whose output buffer can sink 20 mA and drive LED displays directly."
      },
      {
        "number": "19",
        "name": "P1.7",
        "type": "bidirectional",
        "description": "Port 1 bidirectional I/O pin with internal pullup whose output buffer can sink 20 mA and drive LED displays directly."
      },
      {
        "number": "20",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage, specified for operation from 2.7V to 6.0V for the AT89C4051-12PU."
      }
    ],
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [],
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        "cost_usd": 0.0773,
        "at": "2026-11-11T02:23:49"
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      "pins": {
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        "described": 20,
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        "refuses_to_fabricate": true
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    "package_dims": {
      "package_code": "20P3",
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  "metadata": {
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      "Manufacturer": "Microchip Tech",
      "Package": "PDIP-20",
      "Category": "Embedded Processors & Controllers",
      "Pins": "20"
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          "conditions": "IOL = 10 mA, VCC = 2.7V",
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          "name": "Output High-voltage (Ports 1, 3)",
          "symbol": "VOH",
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          "name": "Input Leakage Current (Port P1.0, P1.1)",
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          "name": "Comparator Input Offset Voltage",
          "symbol": "VOS",
          "kind": "electrical",
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          "max": 20,
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          "kind": "electrical",
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          "name": "Reset Pulldown Resistor",
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          "kind": "electrical",
          "unit": "KΩ",
          "min": 50,
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          "kind": "electrical",
          "unit": "pF",
          "min": null,
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          "conditions": "Test Freq. = 1 MHz, TA = 25°C",
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          "name": "Power Supply Current, Active Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 15,
          "conditions": "Active Mode, 12 MHz, VCC = 6V",
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          "name": "Power Supply Current, Active Mode",
          "symbol": "ICC",
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          "symbol": "ICC",
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          "unit": "mA",
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          "name": "Power Supply Current, Idle Mode",
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        {
          "name": "Power Supply Current, Power-down Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "µA",
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          "conditions": "VCC = 6V, P1.0 & P1.1 = 0V or VCC",
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          "name": "Power Supply Current, Power-down Mode",
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          "conditions": "VCC = 3V, P1.0 & P1.1 = 0V or VCC",
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          "name": "Oscillator Frequency",
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          "name": "High Time",
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          "kind": "timing",
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          "name": "Rise Time",
          "symbol": "tCLCH",
          "kind": "timing",
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          "name": "Serial Port Clock Cycle Time",
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          "name": "Output Data Setup to Clock Rising Edge",
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          "name": "Output Data Hold after Clock Rising Edge",
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          "symbol": "VPP",
          "kind": "electrical",
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          "typ": null,
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          "name": "VPP Setup to PROG Low",
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          "name": "VPP Hold after PROG",
          "symbol": "tGHSL",
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          "name": "ENABLE Low to Data Valid",
          "symbol": "tELQV",
          "kind": "timing",
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          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "TA = 20°C to 30°C, VCC = 5.0 ± 10%",
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          "name": "Data Float after ENABLE",
          "symbol": "tEHQZ",
          "kind": "timing",
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          "typ": null,
          "max": 1,
          "conditions": "TA = 20°C to 30°C, VCC = 5.0 ± 10%",
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        {
          "name": "PROG High to BUSY Low",
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          "kind": "timing",
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          "min": null,
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