CDC421A156RGER

{
  "schema_version": 1,
  "type": "component",
  "slug": "cdc421a156rger",
  "title": "CDC421A156RGER",
  "brief": "Texas Instruments Clock Generators / Frequency Synthesizers / PLL, VQFN-24-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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    "rtc-clock chip",
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  "component": {
    "mpn": "CDC421A156RGER",
    "manufacturer": "Texas Instruments",
    "package": "VQFN-24-EP(4x4)",
    "pin_count": 25,
    "category": "RTC/Clock Chip",
    "subcategory": "Clock Generators / Frequency Synthesizers / PLL",
    "datasheet": "https://www.ti.com/lit/ds/symlink/cdc421a156rger.pdf",
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    "distributor_links": {
      "lcsc": "C2664542",
      "digikey": "CDC421A156RGER-ND",
      "mouser": "595-CDC421A156RGER"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T15:19:24Z",
      "source": "Component Ocean /api/assign-pns",
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        "pn": "CDC421A156RGER-ND",
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        "pn": "595-CDC421A156RGER",
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    },
    "pins": [
      {
        "number": "1",
        "name": "CE",
        "type": "input",
        "description": "Chip enable LVCMOS input: CE = 1 enables the device and outputs, while CE = 0 disables all current sources so LVPECL outputs go Hi-Z."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "3",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "5",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "6",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "7",
        "name": "OUTN",
        "type": "output",
        "description": "High-speed negative differential LVPECL output, enabled by the CE pin."
      },
      {
        "number": "8",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin for the device network ground."
      },
      {
        "number": "9",
        "name": "GND",
        "type": "power_in",
        "description": "Ground pin for the device network ground."
      },
      {
        "number": "10",
        "name": "OUTP",
        "type": "output",
        "description": "High-speed positive differential LVPECL output, enabled by the CE pin."
      },
      {
        "number": "11",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "12",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "13",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "14",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "15",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "16",
        "name": "VCC",
        "type": "power_in",
        "description": "3.3-V power supply; recommended supply range is 3.0 V to 3.60 V."
      },
      {
        "number": "17",
        "name": "VCC",
        "type": "power_in",
        "description": "3.3-V power supply; recommended supply range is 3.0 V to 3.60 V."
      },
      {
        "number": "18",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "19",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "20",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "21",
        "name": "XIN1",
        "type": "input",
        "description": "In crystal input mode connects to one end of the crystal; in LVCMOS single-ended driven mode it is the input reference."
      },
      {
        "number": "22",
        "name": "XIN2",
        "type": "input",
        "description": "Connects to the other end of the crystal in crystal mode; in LVCMOS single-ended driven mode it should be connected to GND."
      },
      {
        "number": "23",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "24",
        "name": "NC",
        "type": "unconnected",
        "description": "TI test pin; do not connect, leave floating."
      },
      {
        "number": "25",
        "name": "Thermal pad",
        "type": "passive",
        "description": "Exposed thermal pad on the package bottom; it must be soldered to the printed circuit board for thermal and mechanical performance."
      }
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        "at": "2026-10-28T15:19:10"
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        "described": 25,
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  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "VQFN-24-EP(4x4)",
      "Category": "RTC/Clock Chip",
      "Pins": "25"
    },
    "characteristics": {
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          "name": "Low-level CMOS input current",
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          "max": null,
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        {
          "name": "High-level CMOS input current",
          "symbol": "IH, CMOS",
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          "unit": "µA",
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          "conditions": "VCC = VCC, min, VIH = 3.7 V",
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        {
          "name": "Output rise time",
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          "kind": "timing",
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          "max": null,
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        {
          "name": "Output fall time",
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        {
          "name": "RMS jitter",
          "symbol": "tj",
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          "min": null,
          "typ": 1,
          "max": null,
          "conditions": "10 kHz to 20 MHz",
          "source_page": 3,
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        {
          "name": "Phase noise at 100 Hz",
          "symbol": "phn100",
          "kind": "electrical",
          "unit": "dBc/Hz",
          "min": null,
          "typ": -106,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
          "source_page": 6,
          "source": "datasheet"
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        {
          "name": "Phase noise at 1 kHz",
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          "kind": "electrical",
          "unit": "dBc/Hz",
          "min": null,
          "typ": -117,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
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        {
          "name": "Phase noise at 10 kHz",
          "symbol": "phn10k",
          "kind": "electrical",
          "unit": "dBc/Hz",
          "min": null,
          "typ": -126,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
          "source_page": 6,
          "source": "datasheet"
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          "name": "Phase noise at 100 kHz",
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          "kind": "electrical",
          "unit": "dBc/Hz",
          "min": null,
          "typ": -128,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
          "source_page": 6,
          "source": "datasheet"
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          "name": "Phase noise at 1 MHz",
          "symbol": "phn1M",
          "kind": "electrical",
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          "min": null,
          "typ": -139,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
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          "name": "Phase noise at 10 MHz",
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          "min": null,
          "typ": -147,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
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          "name": "Phase noise at 20 MHz",
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          "kind": "electrical",
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          "min": null,
          "typ": -147,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
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        {
          "name": "RMS jitter integrated from 12 kHz to 20 MHz",
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          "min": null,
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          "name": "Total jitter",
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          "kind": "timing",
          "unit": "ps",
          "min": null,
          "typ": 31.54,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
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          "name": "Deterministic jitter",
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          "min": null,
          "typ": 9.12,
          "max": null,
          "conditions": "LVCMOS input 31.2500 MHz; LVPECL output 156.25 MHz",
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