AT28BV256-20SU

{
  "schema_version": 1,
  "type": "component",
  "slug": "at28bv256-20su",
  "title": "AT28BV256-20SU",
  "brief": "Microchip Tech Pre-ordered Chips, 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",
    "interface ics",
    "at28bv256-20su",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "AT28BV256-20SU",
    "manufacturer": "Microchip Tech",
    "package": "SOIC-28-300mil",
    "pin_count": 28,
    "category": "Interface ICs",
    "subcategory": "Pre-ordered Chips",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/0c8445a498a8e601eaa112f522d37f6e.pdf",
    "parts": {
      "symbol": "at28bv256-20su.kicad_sym",
      "footprint": "at28bv256-20su.kicad_mod",
      "model_3d": "at28bv256-20su-hero.glb",
      "model_3d_plain": "at28bv256-20su-etched.glb",
      "model_3d_step": "at28bv256-20su-etched.step",
      "model_3d_step_plain": "at28bv256-20su.step",
      "lbr": "at28bv256-20su.lbr"
    },
    "distributor_links": {
      "lcsc": "C1348826",
      "digikey": "AT28BV256-20SU-ND",
      "mouser": "556-AT28BV25620SU"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T18:24:47Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT28BV256-20SU-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-AT28BV25620SU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "A14",
        "type": "input",
        "description": "Address input A14; with A6-A13 it selects the 64-byte page during a page write, and all bytes in a page write must share the same A6-A14 state."
      },
      {
        "number": "2",
        "name": "A12",
        "type": "input",
        "description": "Address input A12; part of the A6-A14 page address that must remain constant during a page write."
      },
      {
        "number": "3",
        "name": "A7",
        "type": "input",
        "description": "Address input A7; part of the A6-A14 page address that must remain constant during a page write."
      },
      {
        "number": "4",
        "name": "A6",
        "type": "input",
        "description": "Address input A6; the lowest page-address bit, which must remain constant during a page write."
      },
      {
        "number": "5",
        "name": "A5",
        "type": "input",
        "description": "Address input A5; one of the A0-A5 inputs that select which byte within the 64-byte page is written."
      },
      {
        "number": "6",
        "name": "A4",
        "type": "input",
        "description": "Address input A4; selects the byte within the 64-byte page during a page write."
      },
      {
        "number": "7",
        "name": "A3",
        "type": "input",
        "description": "Address input A3; selects the byte within the 64-byte page during a page write."
      },
      {
        "number": "8",
        "name": "A2",
        "type": "input",
        "description": "Address input A2; selects the byte within the 64-byte page during a page write."
      },
      {
        "number": "9",
        "name": "A1",
        "type": "input",
        "description": "Address input A1; selects the byte within the 64-byte page during a page write."
      },
      {
        "number": "10",
        "name": "A0",
        "type": "input",
        "description": "Address input A0; selects the byte within the 64-byte page during a page write."
      },
      {
        "number": "11",
        "name": "I/O0",
        "type": "bidirectional",
        "description": "Data input/output bit 0; outputs go to high impedance when CE or OE is high."
      },
      {
        "number": "12",
        "name": "I/O1",
        "type": "bidirectional",
        "description": "Data input/output bit 1; outputs go to high impedance when CE or OE is high."
      },
      {
        "number": "13",
        "name": "I/O2",
        "type": "bidirectional",
        "description": "Data input/output bit 2; outputs go to high impedance when CE or OE is high."
      },
      {
        "number": "14",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device; all input and output voltages are specified with respect to ground (-0.6V to VCC + 0.6V on outputs)."
      },
      {
        "number": "15",
        "name": "I/O3",
        "type": "bidirectional",
        "description": "Data input/output bit 3; outputs go to high impedance when CE or OE is high."
      },
      {
        "number": "16",
        "name": "I/O4",
        "type": "bidirectional",
        "description": "Data input/output bit 4; outputs go to high impedance when CE or OE is high."
      },
      {
        "number": "17",
        "name": "I/O5",
        "type": "bidirectional",
        "description": "Data input/output bit 5; outputs go to high impedance when CE or OE is high."
      },
      {
        "number": "18",
        "name": "I/O6",
        "type": "bidirectional",
        "description": "Data input/output bit 6; toggles during a write cycle when read as the toggle bit, and stops toggling when the write completes."
      },
      {
        "number": "19",
        "name": "I/O7",
        "type": "bidirectional",
        "description": "Data input/output bit 7; presents the complement of the last written data during Data Polling to indicate the end of a write cycle."
      },
      {
        "number": "20",
        "name": "CE",
        "type": "input",
        "description": "Chip enable (active low); CE low with OE low and WE high reads the array, and a high level deselects the device and inhibits writes; pulses shorter than 15 ns (typical) on CE are filtered."
      },
      {
        "number": "21",
        "name": "A10",
        "type": "input",
        "description": "Address input A10; part of the A6-A14 page address that must remain constant during a page write."
      },
      {
        "number": "22",
        "name": "OE",
        "type": "input",
        "description": "Output enable (active low); with CE low and WE high it enables the outputs, and OE and A9 are rated from -0.6V to +13.5V with respect to ground."
      },
      {
        "number": "23",
        "name": "A11",
        "type": "input",
        "description": "Address input A11; part of the A6-A14 page address that must remain constant during a page write."
      },
      {
        "number": "24",
        "name": "A9",
        "type": "input",
        "description": "Address input A9; rated from -0.6V to +13.5V, and raised to 12V ±0.5V to access the 64-byte device identification block at 7FC0H-7FFFH."
      },
      {
        "number": "25",
        "name": "A8",
        "type": "input",
        "description": "Address input A8; part of the A6-A14 page address that must remain constant during a page write."
      },
      {
        "number": "26",
        "name": "A13",
        "type": "input",
        "description": "Address input A13; part of the A6-A14 page address that must remain constant during a page write."
      },
      {
        "number": "27",
        "name": "WE",
        "type": "input",
        "description": "Write enable (active low); a low pulse on WE with CE low and OE high initiates a write cycle, and WE high inhibits writes."
      },
      {
        "number": "28",
        "name": "VCC",
        "type": "power_in",
        "description": "Device supply voltage; 2.7V to 3.6V for the AT28BV256-20 operating range."
      }
    ],
    "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 28S (SOIC) pin-to-number mapping was derived from the text extraction of the page 2 SOIC drawing; The page 2 text also contains a second label list (OE at pin 1, A2 at pin 28, GND at pin 22) that ma; The datasheet does not give a per-pin voltage limit for the I/O pins or the individual address pins "
        ],
        "pages_sent": 17,
        "cost_usd": 0.0655,
        "at": "2026-10-30T18:24:27"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/0c8445a498a8e601eaa112f522d37f6e.pdf",
        "pages": 17,
        "sha256": "f00f572c17dec02e",
        "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": [
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        "file": "at28bv256-20su.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": "at28bv256-20su-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
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        "sha256": "33b57c646af00a04e4a14c8f944b82928a66a9a768a7d2310df1d50f5467a04a",
        "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": "Interface ICs",
      "Pins": "28"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "f00f572c17dec02ee45555a343cbc0d445da376c0da19da22de832ec17413c40",
      "rows": [
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          "name": "Input Load Current",
          "symbol": "ILI",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "VIN = 0V to VCC + 1V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Output Leakage Current",
          "symbol": "ILO",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
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          "max": 10,
          "conditions": "VI/O = 0V to VCC",
          "source_page": 6,
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        },
        {
          "name": "VCC Standby Current CMOS",
          "symbol": "ISB",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "CE = VCC - 0.3V to VCC + 1V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VCC Active Current",
          "symbol": "ICC",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
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          "max": 15,
          "conditions": "f = 5 MHz; IOUT = 0 mA",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "Input Low Voltage",
          "symbol": "VIL",
          "kind": "electrical",
          "unit": "V",
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          "symbol": "VOL",
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          "conditions": "IOL = 1.6 mA",
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        },
        {
          "name": "Output High Voltage",
          "symbol": "VOH",
          "kind": "electrical",
          "unit": "V",
          "min": 2,
          "typ": null,
          "max": null,
          "conditions": "IOH = -100 µA",
          "source_page": 6,
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        },
        {
          "name": "Address to Output Delay (AT28BV256-20)",
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        {
          "name": "CE to Output Delay (AT28BV256-20)",
          "symbol": "tCE",
          "kind": "timing",
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        {
          "name": "OE to Output Delay (AT28BV256-20)",
          "symbol": "tOE",
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        },
        {
          "name": "CE or OE to Output Float (AT28BV256-20)",
          "symbol": "tDF",
          "kind": "timing",
          "unit": "ns",
          "min": 0,
          "typ": null,
          "max": 55,
          "conditions": "CL = 5 pF",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "Output Hold from OE, CE or Address, whichever occurred first (AT28BV256-20)",
          "symbol": "tOH",
          "kind": "timing",
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          "typ": null,
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          "conditions": "",
          "source_page": 7,
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        },
        {
          "name": "Input Capacitance",
          "symbol": "CIN",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 4,
          "max": 6,
          "conditions": "f = 1 MHz, T = 25°C; VIN = 0V",
          "source_page": 8,
          "source": "datasheet"
        },
        {
          "name": "Output Capacitance",
          "symbol": "COUT",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 8,
          "max": 12,
          "conditions": "f = 1 MHz, T = 25°C; VOUT = 0V",
          "source_page": 8,
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        {
          "name": "Address, OE Set-up Time",
          "symbol": "tAS, tOES",
          "kind": "timing",
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        {
          "name": "Address Hold Time",
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          "min": 50,
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          "name": "Chip Select Set-up Time",
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        {
          "name": "Write Pulse Width (WE or CE)",
          "symbol": "tWP",
          "kind": "timing",
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        {
          "name": "Data Set-up Time",
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          "name": "Data, OE Hold Time",
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        {
          "name": "Write Cycle Time",
          "symbol": "tWC",
          "kind": "timing",
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          "name": "Address Hold Time (page mode)",
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          "name": "Data Set-up Time (page mode)",
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          "name": "Data Hold Time (page mode)",
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        {
          "name": "Byte Load Cycle Time",
          "symbol": "tBLC",
          "kind": "timing",
          "unit": "µs",
          "min": null,
          "typ": null,
          "max": 150,
          "conditions": "",
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        {
          "name": "Write Pulse Width High",
          "symbol": "tWPH",
          "kind": "timing",
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          "min": 100,
          "typ": null,
          "max": null,
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        {
          "name": "Data Hold Time (data polling)",
          "symbol": "tDH",
          "kind": "timing",
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          "min": 0,
          "typ": null,
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        {
          "name": "OE Hold Time (data polling)",
          "symbol": "tOEH",
          "kind": "timing",
          "unit": "ns",
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          "typ": null,
          "max": null,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Write Recovery Time (data polling)",
          "symbol": "tWR",
          "kind": "timing",
          "unit": "ns",
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          "typ": null,
          "max": null,
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        {
          "name": "Data Hold Time (toggle bit)",
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        {
          "name": "OE Hold Time (toggle bit)",
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        {
          "name": "OE High Pulse",
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        },
        {
          "name": "Write Recovery Time (toggle bit)",
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        },
        {
          "name": "VCC Power Supply",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2.7,
          "typ": null,
          "max": 3.6,
          "conditions": "DC and AC operating range, AT28BV256-20",
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          "name": "Operating Temperature (Case)",
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          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
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          "max": 85,
          "conditions": "DC and AC operating range, AT28BV256-20",
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        {
          "name": "Temperature under Bias",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
        },
        {
          "name": "Storage Temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -65,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 3,
          "source": "datasheet"
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