AT28HC64B-70SU

{
  "schema_version": 1,
  "type": "component",
  "slug": "at28hc64b-70su",
  "title": "AT28HC64B-70SU",
  "brief": "Microchip Tech Pre-ordered MCUs, SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "embedded processors & controllers",
    "at28hc64b-70su",
    "factory-2.0.0",
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  "component": {
    "mpn": "AT28HC64B-70SU",
    "manufacturer": "Microchip Tech",
    "package": "SOIC-28-300mil",
    "pin_count": 28,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Pre-ordered MCUs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/a229aed44259947456af62519294a0a0.pdf",
    "parts": {
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      "lbr": "at28hc64b-70su.lbr"
    },
    "distributor_links": {
      "lcsc": "C609694",
      "digikey": "AT28HC64B-70SU-ND",
      "mouser": "556-AT28HC64B70SU"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T16:14:16Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT28HC64B-70SU-ND",
        "status": "found"
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      "mouser": {
        "pn": "556-AT28HC64B70SU",
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    },
    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; this pin has no internal connection and is left unconnected."
      },
      {
        "number": "2",
        "name": "A12",
        "type": "input",
        "description": "Address input A12 selects the memory location, and A6 to A12 must hold the same page address during a page write."
      },
      {
        "number": "3",
        "name": "A7",
        "type": "input",
        "description": "Address input A7 selects the memory location, and A6 to A12 must hold the same page address during a page write."
      },
      {
        "number": "4",
        "name": "A6",
        "type": "input",
        "description": "Address input A6 selects the memory location, and A6 to A12 must hold the same page address during a page write."
      },
      {
        "number": "5",
        "name": "A5",
        "type": "input",
        "description": "Address input A5 selects the memory location, and A0 to A5 specify which bytes within the page are written."
      },
      {
        "number": "6",
        "name": "A4",
        "type": "input",
        "description": "Address input A4 selects the memory location, and A0 to A5 specify which bytes within the page are written."
      },
      {
        "number": "7",
        "name": "A3",
        "type": "input",
        "description": "Address input A3 selects the memory location, and A0 to A5 specify which bytes within the page are written."
      },
      {
        "number": "8",
        "name": "A2",
        "type": "input",
        "description": "Address input A2 selects the memory location, and A0 to A5 specify which bytes within the page are written."
      },
      {
        "number": "9",
        "name": "A1",
        "type": "input",
        "description": "Address input A1 selects the memory location, and A0 to A5 specify which bytes within the page are written."
      },
      {
        "number": "10",
        "name": "A0",
        "type": "input",
        "description": "Address input A0 selects the memory location, and A0 to A5 specify which bytes within the page are written."
      },
      {
        "number": "11",
        "name": "I/O0",
        "type": "bidirectional",
        "description": "Data input/output bit 0; outputs are high-impedance when CE or OE is high."
      },
      {
        "number": "12",
        "name": "I/O1",
        "type": "bidirectional",
        "description": "Data input/output bit 1; outputs are high-impedance when CE or OE is high."
      },
      {
        "number": "13",
        "name": "I/O2",
        "type": "bidirectional",
        "description": "Data input/output bit 2; outputs are high-impedance when CE or OE is high."
      },
      {
        "number": "14",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "15",
        "name": "I/O3",
        "type": "bidirectional",
        "description": "Data input/output bit 3; outputs are high-impedance when CE or OE is high."
      },
      {
        "number": "16",
        "name": "I/O4",
        "type": "bidirectional",
        "description": "Data input/output bit 4; outputs are high-impedance when CE or OE is high."
      },
      {
        "number": "17",
        "name": "I/O5",
        "type": "bidirectional",
        "description": "Data input/output bit 5; outputs are high-impedance when CE or OE is high."
      },
      {
        "number": "18",
        "name": "I/O6",
        "type": "bidirectional",
        "description": "Data input/output bit 6; it toggles during a write cycle and is used for Toggle Bit end-of-write detection."
      },
      {
        "number": "19",
        "name": "I/O7",
        "type": "bidirectional",
        "description": "Data input/output bit 7; during a write it presents the complement of the written data for DATA Polling."
      },
      {
        "number": "20",
        "name": "CE",
        "type": "input",
        "description": "Chip enable; with OE low and WE high, CE low selects the device for read, and CE high deselects it and puts outputs in high-impedance."
      },
      {
        "number": "21",
        "name": "A10",
        "type": "input",
        "description": "Address input A10 selects the memory location."
      },
      {
        "number": "22",
        "name": "OE",
        "type": "input",
        "description": "Output enable; with CE low and WE high, the addressed data is driven onto I/O0 to I/O7."
      },
      {
        "number": "23",
        "name": "A11",
        "type": "input",
        "description": "Address input A11 selects the memory location, and A6 to A12 must hold the same page address during a page write."
      },
      {
        "number": "24",
        "name": "A9",
        "type": "input",
        "description": "Address input A9; raising it to 12 V ±0.5 V enables access to the 64-byte device identification block at 1FC0H to 1FFFH."
      },
      {
        "number": "25",
        "name": "A8",
        "type": "input",
        "description": "Address input A8 selects the memory location, and A6 to A12 must hold the same page address during a page write."
      },
      {
        "number": "26",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; this pin has no internal connection and is left unconnected."
      },
      {
        "number": "27",
        "name": "WE",
        "type": "input",
        "description": "Write enable; a low pulse on WE with CE low initiates a write cycle."
      },
      {
        "number": "28",
        "name": "VCC",
        "type": "power_in",
        "description": "Single 5 V ±10% power supply."
      }
    ],
    "provenance": {
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        "primary_model": "claude-haiku-5-5",
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        "guards": "pin_guards 0.1: passed",
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        "cost_usd": 0.0249,
        "at": "2026-10-28T16:14:00"
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        "sha256": "4d1c81d44d8fce71",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 28,
        "described": 28,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "SOIC-28-300mil",
      "Category": "Embedded Processors & Controllers",
      "Pins": "28"
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    "characteristics": {
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          "conditions": "f = 1 MHz, T = 25°C; VIN = 0 V",
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          "name": "Address Hold Time",
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          "name": "Toggle Bit Data Hold Time",
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