CD4543B BCD-to-7-Segment Latch

{
  "schema_version": 1,
  "type": "component",
  "slug": "cd4543",
  "title": "CD4543B BCD-to-7-Segment Latch",
  "brief": "BCD-to-7-segment latch/decoder/driver for LCD and LED displays, 4000B CMOS.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "logic",
    "display-driver",
    "bcd",
    "seven-segment",
    "4000-series",
    "ti",
    "soic-16"
  ],
  "component": {
    "mpn": "CD4543B",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-16",
    "pin_count": 16,
    "category": "Logic",
    "subcategory": "Display Driver",
    "datasheet": "https://www.ti.com/lit/ds/symlink/cd4543b.pdf",
    "parts": {
      "symbol": "cd4543.kicad_sym",
      "footprint": "cd4543.kicad_mod",
      "model_3d": "cd4543-etched.glb",
      "model_3d_plain": "cd4543.glb",
      "model_3d_step": "cd4543-etched.step",
      "model_3d_step_plain": "cd4543.step",
      "lbr": "cd4543.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "LD",
        "type": "input",
        "description": "Latch Disable. When LD=1 the BCD inputs A-D are transparent to the decoder; when LD=0 the last BCD code is stored and the display is frozen. Minimum latch-disable pulse width tWH = 125 ns typ at VDD=5 V."
      },
      {
        "number": "2",
        "name": "C",
        "type": "input",
        "description": "BCD data input, weight 2^2 (bit 2). CMOS input with typ 5 pF input capacitance; VIH/VIL = 3.5/1.5 V at VDD=5 V."
      },
      {
        "number": "3",
        "name": "B",
        "type": "input",
        "description": "BCD data input, weight 2^1 (bit 1). CMOS input, latched by LD."
      },
      {
        "number": "4",
        "name": "D",
        "type": "input",
        "description": "BCD data input, weight 2^3 (MSB). CMOS input, latched by LD."
      },
      {
        "number": "5",
        "name": "A",
        "type": "input",
        "description": "BCD data input, weight 2^0 (LSB). CMOS input, latched by LD."
      },
      {
        "number": "6",
        "name": "PHASE",
        "type": "input",
        "description": "Phase / Ph input. Selects the polarity of the seven-segment outputs. For LCD drive, apply a square wave (common-plane signal). For common-cathode LEDs tie Ph=0; for common-anode LEDs tie Ph=1."
      },
      {
        "number": "7",
        "name": "BLANKING",
        "type": "input",
        "description": "Blanking (BI) input. When BI=1 all seven segment outputs are forced to the inactive state (display blanked). When BI=0 the decoded pattern (XOR'd with Ph) is presented on a-g. Tie to VSS for a pin-compatible replacement of the CD4056B."
      },
      {
        "number": "8",
        "name": "VSS",
        "type": "power_in",
        "description": "Negative supply / ground reference. Voltage range 0 V; all input/output voltages are referenced to VSS."
      },
      {
        "number": "9",
        "name": "a",
        "type": "output",
        "description": "Seven-segment output 'a'. CMOS push-pull driver; capable of driving two low-power TTL loads, two HTL loads, one low-power Schottky load, LCD segment (via square-wave Ph) or LED segment directly. IOL/IOH ~1 mA typ at VDD=5 V."
      },
      {
        "number": "10",
        "name": "b",
        "type": "output",
        "description": "Seven-segment output 'b'. CMOS push-pull segment driver, same characteristics as segment a."
      },
      {
        "number": "11",
        "name": "c",
        "type": "output",
        "description": "Seven-segment output 'c'. CMOS push-pull segment driver."
      },
      {
        "number": "12",
        "name": "d",
        "type": "output",
        "description": "Seven-segment output 'd'. CMOS push-pull segment driver."
      },
      {
        "number": "13",
        "name": "e",
        "type": "output",
        "description": "Seven-segment output 'e'. CMOS push-pull segment driver."
      },
      {
        "number": "14",
        "name": "g",
        "type": "output",
        "description": "Seven-segment output 'g' (center bar). CMOS push-pull segment driver."
      },
      {
        "number": "15",
        "name": "f",
        "type": "output",
        "description": "Seven-segment output 'f'. CMOS push-pull segment driver."
      },
      {
        "number": "16",
        "name": "VDD",
        "type": "power_in",
        "description": "Positive supply. Recommended VDD-VSS = 3 V to 18 V (absolute maximum 20 V). Quiescent IDD 0.04 µA typ at VDD=5 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/cd4543b.pdf",
        "pages": 20,
        "sha256": "a1121ae23a462a55",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "logic": {
      "family_id": "CD4543",
      "logic_family": "CD4000",
      "function_code": "4543",
      "function_class": "Decoder",
      "function_name": "BCD-to-7-Segment Latch/Decoder/Driver (LCD-capable)",
      "manufacturer": "Texas Instruments",
      "is_specialty": false
    },
    "models_3d": [
      {
        "file": "cd4543.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          9.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d5eeddb4c0b304dc61950919b126fc61d7586abd5f16ab71a2a79759ec6498bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cd4543-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "09c46f91b187b7491ed9ac100b63ca57b89d8d69fc6ef5ba4fba9cc5c9e6c95f",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "BCD-to-7-segment latch / decoder / driver",
      "Logic family": "4000B (CMOS)",
      "Display types": "LCD (with phase input) or LED",
      "Features": "Latch, ripple blanking, phase input",
      "Supply voltage": "3 V to 18 V",
      "Operating temperature": "-55 C to 125 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "BCD to 7-segment",
    "seven-segment driver",
    "LCD digit driver",
    "display decoder"
  ],
  "discovery_pitch": "Latch a BCD digit and drive a 7-segment LED or LCD display, with a phase input for LCD backplane drive.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "cd4543.kicad_sym",
    "cd4543.kicad_mod",
    "cd4543.glb",
    "cd4543.step",
    "cd4543.lbr",
    "docs/hero.png",
    "docs/cd4543-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "cd4543-etched.step"
  ],
  "variants": [
    {
      "mpn": "CD4543BE",
      "kind": "unknown"
    },
    {
      "mpn": "CD4543BM",
      "kind": "unknown"
    },
    {
      "mpn": "CD4543BM96",
      "kind": "unknown"
    },
    {
      "mpn": "CD4543BNSR",
      "kind": "unknown"
    },
    {
      "mpn": "CD4543BPW",
      "kind": "unknown"
    },
    {
      "mpn": "CD4543BPWR",
      "kind": "unknown"
    },
    {
      "mpn": "CD4543BMT",
      "kind": "unknown"
    }
  ]
}