AT89S52-24AU

{
  "schema_version": 1,
  "type": "component",
  "slug": "at89s52-24au",
  "title": "AT89S52-24AU",
  "brief": "Microchip Tech Microcontrollers (MCU/MPU/SOC), TQFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "embedded processors & controllers",
    "at89s52-24au",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "AT89S52-24AU",
    "manufacturer": "Microchip Tech",
    "package": "TQFP-44(10x10)",
    "pin_count": 44,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586172741158645760",
    "parts": {
      "symbol": "at89s52-24au.kicad_sym",
      "footprint": "at89s52-24au.kicad_mod",
      "model_3d": "at89s52-24au-hero.glb",
      "model_3d_plain": "at89s52-24au-etched.glb",
      "model_3d_step": "at89s52-24au-etched.step",
      "model_3d_step_plain": "at89s52-24au.step",
      "lbr": "at89s52-24au.lbr"
    },
    "distributor_links": {
      "lcsc": "C8731",
      "digikey": "AT89S52-24AU-ND",
      "mouser": "556-A89S52-24AU"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T06:36:53Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT89S52-24AU-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-A89S52-24AU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "P1.5",
        "type": "bidirectional",
        "description": "Port 1 bit 5 with internal pull-ups; also serves as MOSI for In-System Programming."
      },
      {
        "number": "2",
        "name": "P1.6",
        "type": "bidirectional",
        "description": "Port 1 bit 6 with internal pull-ups; also serves as MISO for In-System Programming."
      },
      {
        "number": "3",
        "name": "P1.7",
        "type": "bidirectional",
        "description": "Port 1 bit 7 with internal pull-ups; also serves as SCK for In-System Programming."
      },
      {
        "number": "4",
        "name": "RST",
        "type": "input",
        "description": "Reset input; a high for two machine cycles while the oscillator runs resets the device, and the pin is driven high for 98 oscillator periods after a Watchdog timeout unless DISRTO is set."
      },
      {
        "number": "5",
        "name": "P3.0",
        "type": "bidirectional",
        "description": "Port 3 bit 0 with internal pull-ups; serial data input of the UART."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected; no internal connection to the die as marked on the pin diagram."
      },
      {
        "number": "7",
        "name": "P3.1",
        "type": "bidirectional",
        "description": "Port 3 bit 1 with internal pull-ups; serial data output of the UART."
      },
      {
        "number": "8",
        "name": "P3.2",
        "type": "bidirectional",
        "description": "Port 3 bit 2 with internal pull-ups; external interrupt 0 input."
      },
      {
        "number": "9",
        "name": "P3.3",
        "type": "bidirectional",
        "description": "Port 3 bit 3 with internal pull-ups; external interrupt 1 input."
      },
      {
        "number": "10",
        "name": "P3.4",
        "type": "bidirectional",
        "description": "Port 3 bit 4 with internal pull-ups; external input to Timer/Counter 0."
      },
      {
        "number": "11",
        "name": "P3.5",
        "type": "bidirectional",
        "description": "Port 3 bit 5 with internal pull-ups; external input to Timer/Counter 1."
      },
      {
        "number": "12",
        "name": "P3.6",
        "type": "bidirectional",
        "description": "Port 3 bit 6 with internal pull-ups; external data memory write strobe."
      },
      {
        "number": "13",
        "name": "P3.7",
        "type": "bidirectional",
        "description": "Port 3 bit 7 with internal pull-ups; external data memory read strobe."
      },
      {
        "number": "14",
        "name": "XTAL2",
        "type": "output",
        "description": "Crystal oscillator output pin; the provided pages show the pin label but no electrical limits."
      },
      {
        "number": "15",
        "name": "XTAL1",
        "type": "input",
        "description": "Crystal oscillator input pin; the provided pages show the pin label but no electrical limits."
      },
      {
        "number": "16",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "17",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "18",
        "name": "P2.0 (A8)",
        "type": "bidirectional",
        "description": "Port 2 bit 0 with internal pull-ups; emits the high-order address byte during external program fetches and 16-bit MOVX accesses."
      },
      {
        "number": "19",
        "name": "P2.1 (A9)",
        "type": "bidirectional",
        "description": "Port 2 bit 1 with internal pull-ups; emits the high-order address byte during external program fetches and 16-bit MOVX accesses."
      },
      {
        "number": "20",
        "name": "P2.2 (A10)",
        "type": "bidirectional",
        "description": "Port 2 bit 2 with internal pull-ups; emits the high-order address byte during external program fetches and 16-bit MOVX accesses."
      },
      {
        "number": "21",
        "name": "P2.3 (A11)",
        "type": "bidirectional",
        "description": "Port 2 bit 3 with internal pull-ups; emits the high-order address byte during external program fetches and 16-bit MOVX accesses."
      },
      {
        "number": "22",
        "name": "P2.4 (A12)",
        "type": "bidirectional",
        "description": "Port 2 bit 4 with internal pull-ups; emits the high-order address byte during external program fetches and 16-bit MOVX accesses."
      },
      {
        "number": "23",
        "name": "P2.5 (A13)",
        "type": "bidirectional",
        "description": "Port 2 bit 5 with internal pull-ups; emits the high-order address byte during external program fetches and 16-bit MOVX accesses."
      },
      {
        "number": "24",
        "name": "P2.6 (A14)",
        "type": "bidirectional",
        "description": "Port 2 bit 6 with internal pull-ups; emits the high-order address byte during external program fetches and 16-bit MOVX accesses."
      },
      {
        "number": "25",
        "name": "P2.7 (A15)",
        "type": "bidirectional",
        "description": "Port 2 bit 7 with internal pull-ups; emits the high-order address byte during external program fetches and 16-bit MOVX accesses."
      },
      {
        "number": "26",
        "name": "PSEN",
        "type": "output",
        "description": "Program store enable output; the provided pages list the pin but do not state its timing or limits."
      },
      {
        "number": "27",
        "name": "ALE/PROG",
        "type": "bidirectional",
        "description": "Address Latch Enable output pulse at 1/6 the oscillator frequency for latching the low address byte; serves as the program pulse input (PROG) during Flash programming."
      },
      {
        "number": "28",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected; no internal connection as marked on the pin diagram."
      },
      {
        "number": "29",
        "name": "EA/VPP",
        "type": "input",
        "description": "External access enable/programming voltage pin as labelled on the pin diagram; the provided pages do not state its logic levels or limits."
      },
      {
        "number": "30",
        "name": "P0.7 (AD7)",
        "type": "bidirectional",
        "description": "Open-drain bidirectional Port 0 bit 7; can sink eight TTL inputs and is the multiplexed address/data bus during external memory access, with external pull-ups required for program verification."
      },
      {
        "number": "31",
        "name": "P0.6 (AD6)",
        "type": "bidirectional",
        "description": "Open-drain bidirectional Port 0 bit 6; can sink eight TTL inputs and is the multiplexed address/data bus during external memory access, with external pull-ups required for program verification."
      },
      {
        "number": "32",
        "name": "P0.5 (AD5)",
        "type": "bidirectional",
        "description": "Open-drain bidirectional Port 0 bit 5; can sink eight TTL inputs and is the multiplexed address/data bus during external memory access, with external pull-ups required for program verification."
      },
      {
        "number": "33",
        "name": "P0.4 (AD4)",
        "type": "bidirectional",
        "description": "Open-drain bidirectional Port 0 bit 4; can sink eight TTL inputs and is the multiplexed address/data bus during external memory access, with external pull-ups required for program verification."
      },
      {
        "number": "34",
        "name": "P0.3 (AD3)",
        "type": "bidirectional",
        "description": "Open-drain bidirectional Port 0 bit 3; can sink eight TTL inputs and is the multiplexed address/data bus during external memory access, with external pull-ups required for program verification."
      },
      {
        "number": "35",
        "name": "P0.2 (AD2)",
        "type": "bidirectional",
        "description": "Open-drain bidirectional Port 0 bit 2; can sink eight TTL inputs and is the multiplexed address/data bus during external memory access, with external pull-ups required for program verification."
      },
      {
        "number": "36",
        "name": "P0.1 (AD1)",
        "type": "bidirectional",
        "description": "Open-drain bidirectional Port 0 bit 1; can sink eight TTL inputs and is the multiplexed address/data bus during external memory access, with external pull-ups required for program verification."
      },
      {
        "number": "37",
        "name": "P0.0 (AD0)",
        "type": "bidirectional",
        "description": "Open-drain bidirectional Port 0 bit 0; can sink eight TTL inputs and is the multiplexed address/data bus during external memory access, with external pull-ups required for program verification."
      },
      {
        "number": "38",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage; 4.0V to 5.5V for the -24 speed grade per the ordering information."
      },
      {
        "number": "39",
        "name": "NC",
        "type": "unconnected",
        "description": "Not connected; no internal connection as marked on the pin diagram."
      },
      {
        "number": "40",
        "name": "P1.0 (T2)",
        "type": "bidirectional",
        "description": "Port 1 bit 0 with internal pull-ups; external count input to Timer/Counter 2 and clock-out."
      },
      {
        "number": "41",
        "name": "P1.1",
        "type": "bidirectional",
        "description": "Port 1 bit 1 with internal pull-ups; Timer/Counter 2 capture/reload trigger and direction control input."
      },
      {
        "number": "42",
        "name": "P1.2",
        "type": "bidirectional",
        "description": "General-purpose Port 1 bit 2 with internal pull-ups; output buffers sink/source four TTL inputs."
      },
      {
        "number": "43",
        "name": "P1.3",
        "type": "bidirectional",
        "description": "General-purpose Port 1 bit 3 with internal pull-ups; output buffers sink/source four TTL inputs."
      },
      {
        "number": "44",
        "name": "P1.4",
        "type": "bidirectional",
        "description": "General-purpose Port 1 bit 4 with internal pull-ups; output buffers sink/source four TTL inputs."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "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 44-lead TQFP pin numbers and pin labels are extracted as separate lists on page 2, so the number; XTAL1 and XTAL2 appear only as labels on the pin diagram; the provided pages give no electrical desc; PSEN is labelled on the pin diagram only; the provided pages do not describe its function, timing or",
          "3/44 pins cited to the wrong page (name found elsewhere): ['13:P3.7 (RD)@p5', '15:XTAL1@p2', '27:ALE/PROG@p5']",
          "1/44 pin names appear NOWHERE in the datasheet text: ['14:XTAL2@p2']"
        ],
        "pages_sent": 9,
        "cost_usd": 0.0829,
        "at": "2026-10-18T06:30:52"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586172741158645760",
        "pages": 38,
        "sha256": "6f1fe5ec41885436",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 44,
        "described": 44,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "at89s52-24au.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          12,
          12,
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "61ecec1147f835d2c9d165c450b1c8d53e65b038f6ca1dac3066a2dfb1bbbb85",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "at89s52-24au-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
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        "seat": "z = 0",
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        "centre_offset_mm": 0,
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        "sha256": "0adfdb62bff5a69d30328d4e4d5df7ac8c3337369bc6aea5b32d19528059f728",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "TQFP-44(10x10)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "44"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "6f1fe5ec418854368a25018ef8831d05dfe254a3265112cef9397105e4564a57",
      "rows": [
        {
          "name": "Input Low Voltage (Except EA)",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": null,
          "conditions": "TA = -40°C to 85°C, VCC = 4.0V to 5.5V",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Input Low Voltage (EA)",
          "symbol": "VIL1",
          "kind": "electrical",
          "unit": "V",
          "min": -0.5,
          "typ": null,
          "max": null,
          "conditions": "TA = -40°C to 85°C, VCC = 4.0V to 5.5V",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Output Low Voltage (Ports 1,2,3)",
          "symbol": "VOL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.45,
          "conditions": "IOL = 1.6 mA",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Output Low Voltage (Port 0, ALE, PSEN)",
          "symbol": "VOL1",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.45,
          "conditions": "IOL = 3.2 mA",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Output High Voltage (Ports 1,2,3, ALE, PSEN)",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.4,
          "typ": null,
          "max": null,
          "conditions": "IOH = -60 µA, VCC = 5V ± 10%",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Output High Voltage (Port 0 in External Bus Mode)",
          "symbol": "VOH1",
          "kind": "electrical",
          "unit": "V",
          "min": 2.4,
          "typ": null,
          "max": null,
          "conditions": "IOH = -800 µA, VCC = 5V ± 10%",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Logical 0 Input Current (Ports 1,2,3)",
          "symbol": "IIL",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": -50,
          "conditions": "VIN = 0.45V",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Logical 1 to 0 Transition Current (Ports 1,2,3)",
          "symbol": "ITL",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": -300,
          "conditions": "VIN = 2V, VCC = 5V ± 10%",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Input Leakage Current (Port 0, EA)",
          "symbol": "ILI",
          "kind": "electrical",
          "unit": "µA",
          "min": -10,
          "typ": null,
          "max": 10,
          "conditions": "0.45 < VIN < VCC",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Reset Pulldown Resistor",
          "symbol": "RRST",
          "kind": "electrical",
          "unit": "KΩ",
          "min": 50,
          "typ": null,
          "max": 300,
          "conditions": "",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Pin Capacitance",
          "symbol": "CIO",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "Test Freq. = 1 MHz, TA = 25°C",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Power Supply Current, Active Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 25,
          "conditions": "Active Mode, 12 MHz",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Power Supply Current, Idle Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 6.5,
          "conditions": "Idle Mode, 12 MHz",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Power Supply Current, Power-down Mode",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "VCC = 5.5V",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Voltage on Any Pin with Respect to Ground",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -1,
          "typ": null,
          "max": 7,
          "conditions": "",
          "source_page": 29,
          "source": "datasheet"
        },
        {
          "name": "Maximum Operating Voltage",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 6.6,
          "conditions": "",
          "source_page": 29,
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        },
        {
          "name": "DC Output Current",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 15,
          "conditions": "",
          "source_page": 29,
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        },
        {
          "name": "Supply Voltage (24 MHz speed grade)",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4,
          "typ": null,
          "max": 5.5,
          "conditions": "Ordering info: speed 24 MHz, 4.0V to 5.5V",
          "source_page": 34,
          "source": "datasheet"
        },
        {
          "name": "Operating Temperature (Industrial)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "Industrial operation range",
          "source_page": 34,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Frequency (Serial Programming)",
          "symbol": "1/tCLCL",
          "kind": "timing",
          "unit": "MHz",
          "min": 3,
          "typ": null,
          "max": 33,
          "conditions": "TA = -40°C to 85°C, VCC = 4.0-5.5V",
          "source_page": 28,
          "source": "datasheet"
        },
        {
          "name": "Oscillator Period",
          "symbol": "tCLCL",
          "kind": "timing",
          "unit": "ns",
          "min": 30,
          "typ": null,
          "max": null,
          "conditions": "TA = -40°C to 85°C, VCC = 4.0-5.5V",
          "source_page": 28,
          "source": "datasheet"
        },
        {
          "name": "SCK Low to MISO Valid",
          "symbol": "tSLIV",
          "kind": "timing",
          "unit": "ns",
          "min": 10,
          "typ": 16,
          "max": 32,
          "conditions": "TA = -40°C to 85°C, VCC = 4.0-5.5V",
          "source_page": 28,
          "source": "datasheet"
        },
        {
          "name": "Chip Erase Instruction Cycle Time",
          "symbol": "tERASE",
          "kind": "timing",
          "unit": "ms",
          "min": null,
          "typ": null,
          "max": 500,
          "conditions": "TA = -40°C to 85°C, VCC = 4.0-5.5V",
          "source_page": 28,
          "source": "datasheet"
        },
        {
          "name": "Programming Supply Voltage",
          "symbol": "VPP",
          "kind": "electrical",
          "unit": "V",
          "min": 11.5,
          "typ": null,
          "max": 12.5,
          "conditions": "TA = 20°C to 30°C, VCC = 4.5 to 5.5V",
          "source_page": 25,
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