LMC555CMMX

{
  "schema_version": 1,
  "type": "component",
  "slug": "lmc555cmmx",
  "title": "LMC555CMMX",
  "brief": "Texas Instruments Timers / Clock Oscillators, VSSOP-8-0.65mm. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "rtc",
    "lmc555cmmx"
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  "component": {
    "mpn": "LMC555CMMX",
    "manufacturer": "Texas Instruments",
    "package": "VSSOP-8-0.65mm",
    "pin_count": 8,
    "category": "RTC",
    "subcategory": "Timers / Clock Oscillators",
    "datasheet": "https://www.ti.com/lit/ds/symlink/lmc555cmmx.pdf",
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      "lbr": "lmc555cmmx.lbr"
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference (0 V) for the device. Connect to the negative supply rail."
      },
      {
        "number": "2",
        "name": "TRIG",
        "type": "input",
        "description": "Trigger input. A negative pulse below 1/3 V+ on this pin sets the internal flip-flop, driving OUT high and starting the timing cycle."
      },
      {
        "number": "3",
        "name": "OUT",
        "type": "output",
        "description": "Push-pull timer output. Swings between GND and V+ and can source or sink load current (typ. up to ~50 mA at V+ = 15 V)."
      },
      {
        "number": "4",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset. Pulling below ~0.7 V forces OUT low and discharges the timing capacitor regardless of TRIG. Tie to V+ when unused."
      },
      {
        "number": "5",
        "name": "CONT",
        "type": "input",
        "description": "Control voltage. Provides access to the internal 2/3 V+ threshold reference; can be driven externally to modulate timing or pulse width. Typically bypassed to GND via a 10 nF capacitor when unused."
      },
      {
        "number": "6",
        "name": "THRES",
        "type": "input",
        "description": "Threshold input. When the voltage on this pin exceeds 2/3 V+, the internal flip-flop is reset, driving OUT low and turning on the discharge transistor."
      },
      {
        "number": "7",
        "name": "DISCH",
        "type": "output",
        "description": "Discharge. Open-drain output from an internal N-channel MOSFET; used to discharge the external timing capacitor when OUT is low."
      },
      {
        "number": "8",
        "name": "V+",
        "type": "power_in",
        "description": "Positive supply voltage, 1.5 V to 15 V. Bypass to GND with a 100 nF ceramic capacitor placed close to the pin."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/lmc555cmmx.pdf",
        "pages": 32,
        "sha256": "23c01b550f0a28cb",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
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        -0.75
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "VSSOP-8_2.3x2mm_P0.5mm@sha256:dca72da69de3263a",
      "mark": "drawn"
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        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
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        "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": "VSSOP-8-0.65mm",
      "Category": "RTC",
      "Pins": "8"
    }
  },
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
    "info"
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  "discovery_triggers": [
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  "discovery_pitch": "LMC555CMMX (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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  "variants": [
    {
      "mpn": "LMC555CMMX",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMMXCMX",
      "kind": "packaging"
    },
    {
      "mpn": "LMC555CMMXCN",
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  ],
  "updated_at": "2026-09-28T17:13:10.109Z"
}