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Ray Set visibility: public 34beb9c 5d ago
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{
  "schema_version": 1,
  "type": "component",
  "slug": "at28hc256-70su",
  "title": "AT28HC256-70SU",
  "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": [
    "component",
    "embedded processors & controllers",
    "at28hc256-70su",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "AT28HC256-70SU",
    "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/69487d138f6dfa367cf13259c029e406.pdf",
    "parts": {
      "symbol": "at28hc256-70su.kicad_sym",
      "footprint": "at28hc256-70su.kicad_mod",
      "model_3d": "at28hc256-70su-hero.glb",
      "model_3d_plain": "at28hc256-70su-etched.glb",
      "model_3d_step": "at28hc256-70su-etched.step",
      "model_3d_step_plain": "at28hc256-70su.step",
      "lbr": "at28hc256-70su.lbr"
    },
    "distributor_links": {
      "lcsc": "C609689",
      "digikey": "AT28HC256-70SU-ND",
      "mouser": "556-AT28HC256-70SU"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T20:32:04Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT28HC256-70SU-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-AT28HC256-70SU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A14",
        "type": "input",
        "description": "Address input A14."
      },
      {
        "number": "2",
        "name": "A12",
        "type": "input",
        "description": "Address input A12."
      },
      {
        "number": "3",
        "name": "A7",
        "type": "input",
        "description": "Address input A7."
      },
      {
        "number": "4",
        "name": "A6",
        "type": "input",
        "description": "Address input A6."
      },
      {
        "number": "5",
        "name": "A5",
        "type": "input",
        "description": "Address input A5."
      },
      {
        "number": "6",
        "name": "A4",
        "type": "input",
        "description": "Address input A4."
      },
      {
        "number": "7",
        "name": "A3",
        "type": "input",
        "description": "Address input A3."
      },
      {
        "number": "8",
        "name": "A2",
        "type": "input",
        "description": "Address input A2."
      },
      {
        "number": "9",
        "name": "A1",
        "type": "input",
        "description": "Address input A1."
      },
      {
        "number": "10",
        "name": "A0",
        "type": "input",
        "description": "Address input A0."
      },
      {
        "number": "11",
        "name": "I/O0",
        "type": "bidirectional",
        "description": "Data input/output bit 0."
      },
      {
        "number": "12",
        "name": "I/O1",
        "type": "bidirectional",
        "description": "Data input/output bit 1."
      },
      {
        "number": "13",
        "name": "I/O2",
        "type": "bidirectional",
        "description": "Data input/output bit 2."
      },
      {
        "number": "14",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "15",
        "name": "I/O3",
        "type": "bidirectional",
        "description": "Data input/output bit 3."
      },
      {
        "number": "16",
        "name": "I/O4",
        "type": "bidirectional",
        "description": "Data input/output bit 4."
      },
      {
        "number": "17",
        "name": "I/O5",
        "type": "bidirectional",
        "description": "Data input/output bit 5."
      },
      {
        "number": "18",
        "name": "I/O6",
        "type": "bidirectional",
        "description": "Data input/output bit 6."
      },
      {
        "number": "19",
        "name": "I/O7",
        "type": "bidirectional",
        "description": "Data input/output bit 7; used for DATA Polling to detect end of write."
      },
      {
        "number": "20",
        "name": "CE",
        "type": "input",
        "description": "Chip Enable input; deselecting the device puts it in standby."
      },
      {
        "number": "21",
        "name": "A10",
        "type": "input",
        "description": "Address input A10."
      },
      {
        "number": "22",
        "name": "OE",
        "type": "input",
        "description": "Output Enable input."
      },
      {
        "number": "23",
        "name": "A11",
        "type": "input",
        "description": "Address input A11."
      },
      {
        "number": "24",
        "name": "A9",
        "type": "input",
        "description": "Address input A9."
      },
      {
        "number": "25",
        "name": "A8",
        "type": "input",
        "description": "Address input A8."
      },
      {
        "number": "26",
        "name": "A13",
        "type": "input",
        "description": "Address input A13."
      },
      {
        "number": "27",
        "name": "WE",
        "type": "input",
        "description": "Write Enable input."
      },
      {
        "number": "28",
        "name": "VCC",
        "type": "power_in",
        "description": "Device power supply, single 5V ± 10%."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: AT28HC256-70SU (no E/F option, 70 ns) is not listed in the ordering tables on pages 30-31, which onl"
        ],
        "pages_sent": 14,
        "cost_usd": 0.1002,
        "at": "2026-10-30T20:31:54"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/69487d138f6dfa367cf13259c029e406.pdf",
        "pages": 34,
        "sha256": "9fbfb62b758b1eb8",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 28,
        "described": 28,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "at28hc256-70su.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          17.9,
          2.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "b889a13dbe9ec59e79fa9f1b5118b00bfa54f9582392335ff3365b64afc264b1",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "at28hc256-70su-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          17.9,
          2.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "cfe1a933d30708217584f75f79f7b1599dee550fdb50225e8930e3667bcd71cf",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "SOIC-28-300mil",
      "Category": "Embedded Processors & Controllers",
      "Pins": "28"
    },
    "appearance": {
      "contacts": {
        "quote": "U = -40°C to +85°C Industrial Temperature Grade, 100% Matte Sn Terminal Finish AT28 HC 256 ( )- 90 JU-T",
        "page": 30,
        "doc": "ds.pdf",
        "plating": "tin"
      },
      "version": 1,
      "datasheet_sha256": "9fbfb62b758b1eb8387cdd60e3dcce95268f1a86cf78f7f3ac643eab3131b191"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "9fbfb62b758b1eb8387cdd60e3dcce95268f1a86cf78f7f3ac643eab3131b191",
      "rows": [
        {
          "name": "VCC Standby Current TTL (AT28HC256-70)",
          "symbol": "ISB1",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 60,
          "conditions": "CE = 2.0V to VCC",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Input Load Current",
          "symbol": "ILI",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "VIN = 0V to VCC + 1V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output Leakage Current",
          "symbol": "ILO",
          "kind": "electrical",
          "unit": "μA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "VI/O = 0V to VCC",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "VCC Active Current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 80,
          "conditions": "f = 5 MHz; IOUT = 0 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Input Low Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
          "min": null,
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          "max": 0.8,
          "conditions": "",
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        {
          "name": "Input High Voltage",
          "symbol": "VIH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
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        {
          "name": "Output Low Voltage",
          "symbol": "VOL",
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          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.45,
          "conditions": "IOL = 6.0 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output High Voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 2.4,
          "typ": null,
          "max": null,
          "conditions": "IOH = -4 mA",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Address to Output Delay",
          "symbol": "tACC",
          "kind": "timing",
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          "min": null,
          "typ": null,
          "max": 70,
          "conditions": "AT28HC256-70",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "CE to Output Delay",
          "symbol": "tCE",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 70,
          "conditions": "AT28HC256-70",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "OE to Output Delay",
          "symbol": "tOE",
          "kind": "timing",
          "unit": "ns",
          "min": 0,
          "typ": null,
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          "conditions": "AT28HC256-70",
          "source_page": 11,
          "source": "datasheet"
        },
        {
          "name": "CE or OE to Output Float",
          "symbol": "tDF",
          "kind": "timing",
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          "conditions": "AT28HC256-70",
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          "source": "datasheet"
        },
        {
          "name": "Output Hold from OE, CE or Address",
          "symbol": "tOH",
          "kind": "timing",
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          "typ": null,
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          "conditions": "AT28HC256-70",
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          "source": "datasheet"
        },
        {
          "name": "Address, OE Setup Time",
          "symbol": "tAS, tOES",
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          "max": null,
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        {
          "name": "Address Hold Time",
          "symbol": "tAH",
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        {
          "name": "Chip Select Setup Time",
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        {
          "name": "Chip Select Hold Time",
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          "source": "datasheet"
        },
        {
          "name": "Write Pulse Width (WE or CE)",
          "symbol": "tWP",
          "kind": "timing",
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          "source": "datasheet"
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        {
          "name": "Data Setup Time",
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        {
          "name": "Data, OE Hold Time",
          "symbol": "tDH, tOEH",
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          "typ": null,
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        {
          "name": "Write Cycle Time",
          "symbol": "tWC",
          "kind": "timing",
          "unit": "ms",
          "min": null,
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          "max": 10,
          "conditions": "AT28HC256 (standard option)",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Byte Load Cycle Time",
          "symbol": "tBLC",
          "kind": "timing",
          "unit": "µs",
          "min": null,
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          "max": 150,
          "conditions": "",
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        },
        {
          "name": "Write Pulse Width High",
          "symbol": "tWPH",
          "kind": "timing",
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          "typ": null,
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          "conditions": "",
          "source_page": 14,
          "source": "datasheet"
        },
        {
          "name": "Data Polling Data Hold Time",
          "symbol": "tDH",
          "kind": "timing",
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          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "Data Polling",
          "source_page": 18,
          "source": "datasheet"
        },
        {
          "name": "Data Polling OE Hold Time",
          "symbol": "tOEH",
          "kind": "timing",
          "unit": "ns",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "Data Polling",
          "source_page": 18,
          "source": "datasheet"
        },
        {
          "name": "Data Polling Write Recovery Time",
          "symbol": "tWR",
          "kind": "timing",
          "unit": "ns",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "Data Polling",
          "source_page": 18,
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        },
        {
          "name": "Toggle Bit Data Hold Time",
          "symbol": "tDH",
          "kind": "timing",
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          "max": null,
          "conditions": "Toggle Bit",
          "source_page": 19,
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        },
        {
          "name": "Toggle Bit OE Hold Time",
          "symbol": "tOEH",
          "kind": "timing",
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          "min": 10,
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          "max": null,
          "conditions": "Toggle Bit",
          "source_page": 19,
          "source": "datasheet"
        },
        {
          "name": "Toggle Bit OE High Pulse",
          "symbol": "tOEHP",
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          "min": 150,
          "typ": null,
          "max": null,
          "conditions": "Toggle Bit",
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        {
          "name": "Toggle Bit Write Recovery Time",
          "symbol": "tWR",
          "kind": "timing",
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          "max": null,
          "conditions": "Toggle Bit",
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        },
        {
          "name": "Input Capacitance",
          "symbol": "CIN",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 4,
          "max": 6,
          "conditions": "VIN = 0V; f = 1 MHz, TA = 25°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Output Capacitance",
          "symbol": "COUT",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 8,
          "max": 12,
          "conditions": "VOUT = 0V; f = 1 MHz, TA = 25°C",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Temperature under bias",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "",
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          "unit": "°C",
          "min": -65,
          "typ": null,
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        },
        {
          "name": "All input voltages (including NC pins) with respect to ground",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.6,
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          "max": 6.25,
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        },
        {
          "name": "All output voltages with respect to ground",
          "symbol": "",
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          "unit": "V",
          "min": -0.6,
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          "conditions": "Upper limit VCC + 0.6V",
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          "source": "datasheet"
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