LMC555CMX

{
  "schema_version": 1,
  "type": "component",
  "slug": "lmc555cmx",
  "title": "LMC555CMX",
  "brief": "Texas Instruments Timers / Clock Oscillators, SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "lmc555cmx"
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  "component": {
    "mpn": "LMC555CMX",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "RTC",
    "subcategory": "Timers / Clock Oscillators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lmc555cmx.pdf",
    "parts": {
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      "footprint": "lmc555cmx.kicad_mod",
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      "model_3d_step": "lmc555cmx-etched.step",
      "model_3d_step_plain": "lmc555cmx.step",
      "lbr": "lmc555cmx.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference voltage. All voltages in the datasheet are measured with respect to this pin."
      },
      {
        "number": "2",
        "name": "TRIG",
        "type": "input",
        "description": "Trigger input (active low). Responsible for transition of the flip-flop from set to reset. A negative-going pulse below 1/3 Vcc sets the output high. Typical trigger voltage ~1.67 V at Vs = 5 V; trigger current ~10 pA."
      },
      {
        "number": "3",
        "name": "OUT",
        "type": "output",
        "description": "Output driven waveform. CMOS/TTL-compatible push-pull output rated to source/sink up to ~50 mA at 5 V supply (tested at -10 mA / 50 mA output current levels)."
      },
      {
        "number": "4",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset input. Negative pulse applied to this pin disables or resets the timer. When not used for reset purposes it should be tied to V+ to avoid false triggering. VRES typ 0.7 V at Vs = 1.5 V (Vs must be >= 2.0 V if RESET is used at -20 degC or below)."
      },
      {
        "number": "5",
        "name": "CTRL",
        "type": "input",
        "description": "Control voltage input. Sets the threshold and trigger comparator levels (nominally 2/3 Vcc). Typically bypassed to GND with a 0.01 uF capacitor; can be driven externally to modulate the output waveform."
      },
      {
        "number": "6",
        "name": "THRES",
        "type": "input",
        "description": "Threshold input. Compares the applied voltage against the internal 2/3 Vcc reference; when exceeded, the flip-flop is reset and the output goes low. Threshold input current ~10 pA at Vs = 5 V."
      },
      {
        "number": "7",
        "name": "DISCH",
        "type": "output",
        "description": "Open-drain discharge output. Discharges the external timing capacitor between intervals (in phase with OUT). Toggles from high-impedance to low when the timing capacitor voltage reaches 2/3 Vcc. Discharge saturation voltage typ 150 mV at IDIS = 10 mA (Vs = 5 V)."
      },
      {
        "number": "8",
        "name": "V+",
        "type": "power_in",
        "description": "Positive supply voltage with respect to GND. Recommended operating range 1.5 V to 15 V (absolute max 15 V). Typical supply current 100 uA at Vs = 5 V."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/lmc555cmx.pdf",
        "pages": 30,
        "sha256": "3ac8d41ac202b0b0",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
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      "footprint": "viewers/footprint.html"
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    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
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        "units": "mm",
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        "seat": "z = 0",
        "extents_mm": [
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
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        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "SOIC-8",
      "Category": "RTC",
      "Pins": "8"
    }
  },
  "sections": [
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    "readme",
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    "info"
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  "discovery_triggers": [
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  "discovery_pitch": "LMC555CMX (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
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  "visibility": {
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  "variants": [
    {
      "mpn": "LMC555CMX",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXIM",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXIMX",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXCMM",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXCMMX",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXIMM",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXIMMX",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXCN",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXN",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXTP",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMXTPX",
      "kind": "packaging"
    }
  ],
  "updated_at": "2026-09-28T17:13:17.793Z"
}