STC90C516AD-40I-LQFP44

{
  "schema_version": 1,
  "type": "component",
  "slug": "stc90c516ad-40i-lqfp44",
  "title": "STC90C516AD-40I-LQFP44",
  "brief": "STC Micro Microcontrollers (MCU/MPU/SOC), LQFP-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",
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  "component": {
    "mpn": "STC90C516AD-40I-LQFP44",
    "manufacturer": "STC Micro",
    "package": "LQFP-44(10x10)",
    "pin_count": 44,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586172911534792704",
    "parts": {
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      "lbr": "stc90c516ad-40i-lqfp44.lbr"
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    "distributor_links": {
      "lcsc": "C8769"
    },
    "distributor_check": {
      "checked_at": "2026-10-20T17:32:14Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "P1.5",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port pin PORT1[5]; no alternate function is listed for this pin in the LQFP44 table."
      },
      {
        "number": "2",
        "name": "P1.6",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port pin PORT1[6]; no alternate function is listed for this pin in the LQFP44 table."
      },
      {
        "number": "3",
        "name": "P1.7",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port pin PORT1[7]; no alternate function is listed for this pin in the LQFP44 table."
      },
      {
        "number": "4",
        "name": "RST",
        "type": "input",
        "description": "Reset pin: holding it high for at least 24 clock cycles plus 10 µs puts the MCU into reset, and it starts from 0000H when pulled back low."
      },
      {
        "number": "5",
        "name": "P3.0/RxD",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT3[0]; serves as RxD, the serial port 1 data receive input."
      },
      {
        "number": "6",
        "name": "P4.3/INT2",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT4[3]; serves as external interrupt 2 input (falling-edge or low-level triggered)."
      },
      {
        "number": "7",
        "name": "P3.1/TxD",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT3[1]; serves as TxD, the serial port 1 data transmit output."
      },
      {
        "number": "8",
        "name": "P3.2/INT0",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT3[2]; serves as external interrupt 0 input, falling-edge or low-level triggered."
      },
      {
        "number": "9",
        "name": "P3.3/INT1",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT3[3]; serves as external interrupt 1 input, falling-edge or low-level triggered."
      },
      {
        "number": "10",
        "name": "P3.4/T0",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT3[4]; serves as external count input to Timer/Counter 0."
      },
      {
        "number": "11",
        "name": "P3.5/T1",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT3[5]; serves as external count input to Timer/Counter 1."
      },
      {
        "number": "12",
        "name": "P3.6/WR",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT3[6]; serves as WR, the external data memory write strobe."
      },
      {
        "number": "13",
        "name": "P3.7/RD",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT3[7]; serves as RD, the external data memory read strobe."
      },
      {
        "number": "14",
        "name": "XTAL2",
        "type": "output",
        "description": "Output of the internal clock inverting amplifier for the external crystal; may be left floating when an external clock drives XTAL1."
      },
      {
        "number": "15",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the internal clock inverting amplifier for the external crystal; acts as the external clock input when an external clock source is used directly."
      },
      {
        "number": "16",
        "name": "Gnd",
        "type": "power_in",
        "description": "Power supply negative terminal (ground)."
      },
      {
        "number": "17",
        "name": "P4.0",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT4[0] (Port 4 is bit-addressable at SFR address E8H)."
      },
      {
        "number": "18",
        "name": "P2.0",
        "type": "bidirectional",
        "description": "Port 2 bit 0 with internal pull-up; I/O pin, or low-order high address bit A8 when external memory is used."
      },
      {
        "number": "19",
        "name": "P2.1",
        "type": "bidirectional",
        "description": "Port 2 bit 1 with internal pull-up; I/O pin, or address bit A9 when external memory is used."
      },
      {
        "number": "20",
        "name": "P2.2",
        "type": "bidirectional",
        "description": "Port 2 bit 2 with internal pull-up; I/O pin, or address bit A10 when external memory is used."
      },
      {
        "number": "21",
        "name": "P2.3",
        "type": "bidirectional",
        "description": "Port 2 bit 3 with internal pull-up; I/O pin, or address bit A11 when external memory is used."
      },
      {
        "number": "22",
        "name": "P2.4",
        "type": "bidirectional",
        "description": "Port 2 bit 4 with internal pull-up; I/O pin, or address bit A12 when external memory is used."
      },
      {
        "number": "23",
        "name": "P2.5",
        "type": "bidirectional",
        "description": "Port 2 bit 5 with internal pull-up; I/O pin, or address bit A13 when external memory is used."
      },
      {
        "number": "24",
        "name": "P2.6",
        "type": "bidirectional",
        "description": "Port 2 bit 6 with internal pull-up; I/O pin, or address bit A14 when external memory is used."
      },
      {
        "number": "25",
        "name": "P2.7",
        "type": "bidirectional",
        "description": "Port 2 bit 7 with internal pull-up; I/O pin, or high-order address bit A15 when external memory is used."
      },
      {
        "number": "26",
        "name": "P4.4/PSEN",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT4[4]; labelled PSEN on the pinout diagram, with no further function described in the pin table."
      },
      {
        "number": "27",
        "name": "P4.5/ALE",
        "type": "bidirectional",
        "description": "ALE address latch enable output by default; can be set to standard I/O P4.5 in the ISP programmer, and also serves as programming pulse input."
      },
      {
        "number": "28",
        "name": "P4.1",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT4[1]."
      },
      {
        "number": "29",
        "name": "P4.6/EA",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT4[6]; labelled EA on the pinout diagram, with no further function described in the pin table."
      },
      {
        "number": "30",
        "name": "P0.7",
        "type": "bidirectional",
        "description": "Port 0 bit 7, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed data/address bus line AD7 when used as bus."
      },
      {
        "number": "31",
        "name": "P0.6",
        "type": "bidirectional",
        "description": "Port 0 bit 6, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD6 when used as bus."
      },
      {
        "number": "32",
        "name": "P0.5",
        "type": "bidirectional",
        "description": "Port 0 bit 5, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD5 when used as bus."
      },
      {
        "number": "33",
        "name": "P0.4",
        "type": "bidirectional",
        "description": "Port 0 bit 4, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD4 when used as bus."
      },
      {
        "number": "34",
        "name": "P0.3",
        "type": "bidirectional",
        "description": "Port 0 bit 3, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD3 when used as bus."
      },
      {
        "number": "35",
        "name": "P0.2",
        "type": "bidirectional",
        "description": "Port 0 bit 2, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD2 when used as bus."
      },
      {
        "number": "36",
        "name": "P0.1",
        "type": "bidirectional",
        "description": "Port 0 bit 1, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD1 when used as bus."
      },
      {
        "number": "37",
        "name": "P0.0",
        "type": "bidirectional",
        "description": "Port 0 bit 0, open-drain after power-on reset; needs an external 10K-4.7K pull-up when used as I/O, and is the multiplexed bus line AD0 when used as bus."
      },
      {
        "number": "38",
        "name": "Vcc",
        "type": "power_in",
        "description": "Power supply positive terminal."
      },
      {
        "number": "39",
        "name": "P4.2/INT3",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT4[2]; serves as external interrupt 3 input, falling-edge or low-level triggered."
      },
      {
        "number": "40",
        "name": "P1.0/T2",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT1[0]; serves as external input to Timer/Counter 2."
      },
      {
        "number": "41",
        "name": "P1.1/T2EX",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT1[1]; serves as T2EX, the Timer/Counter 2 capture/reload trigger control input."
      },
      {
        "number": "42",
        "name": "P1.2",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT1[2]; no alternate function is listed for this pin in the LQFP44 table."
      },
      {
        "number": "43",
        "name": "P1.3",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT1[3]; no alternate function is listed for this pin in the LQFP44 table."
      },
      {
        "number": "44",
        "name": "P1.4",
        "type": "bidirectional",
        "description": "Standard I/O port pin PORT1[4]; no alternate function is listed for this pin in the LQFP44 table."
      }
    ],
    "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 page 2 LQFP44 drawing text is scrambled in extraction, so the pin-number mapping was taken from ; Pin 6 is labelled INT3 in the pin description text but INT2 in the pinout diagram and in the P4.3 ro; Pins 26 (P4.4/PSEN) and 29 (P4.6/EA) are listed as standard I/O in the pin table, while the pinout d",
          "2/44 pins cited to the wrong page (name found elsewhere): ['14:XTAL2@p26', '15:XTAL1@p26']"
        ],
        "pages_sent": 114,
        "cost_usd": 1.0897,
        "at": "2026-10-20T17:30:18"
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      "datasheet": {
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        "sha256": "1875b8d4226f5c42",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 44,
        "described": 44,
        "cites_pages": true,
        "refuses_to_fabricate": true
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      "Manufacturer": "STC Micro",
      "Package": "LQFP-44(10x10)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "44"
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        "quote": "Accumulator contents and the contents of a sixteen-bit base register, which may be either the Data Pointer or the PC. In the latter case, the PC is incremented to the address of the",
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          "name": "Storage temperature",
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          "name": "Operating temperature (I)",
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          "name": "Operating Voltage",
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          "name": "Input Low voltage (RESET, XTAL1)",
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          "name": "Sinking Current for output low (P1,P2,P3,P4)",
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          "name": "Logic 1 to 0 transition current (P1,P2,P3,P4)",
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