DS1307MM

{
  "schema_version": 1,
  "type": "component",
  "slug": "ds1307mm",
  "title": "DS1307MM",
  "brief": "HGSEMI Real Time Clocks, MSOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "clock-timing",
    "ds1307mm",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "DS1307MM",
    "manufacturer": "HGSEMI",
    "package": "MSOP-8",
    "pin_count": 8,
    "category": "Clock/Timing",
    "subcategory": "Real Time Clocks",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8756372542519160832",
    "parts": {
      "symbol": "ds1307mm.kicad_sym",
      "footprint": "ds1307mm.kicad_mod",
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      "model_3d_step": "ds1307mm-etched.step",
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      "lbr": "ds1307mm.lbr"
    },
    "distributor_links": {
      "lcsc": "C20618051"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T12:28:35Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "X1",
        "type": "passive",
        "description": "32.768 kHz crystal pin; the datasheet specifies a crystal load capacitance (CL) of 12.5 pF, and when the device is driven by an external 32.768 kHz oscillator, this pin is the oscillator input."
      },
      {
        "number": "2",
        "name": "X2",
        "type": "passive",
        "description": "32.768 kHz crystal pin; it is left floating when the device is driven by an external 32.768 kHz oscillator on X1."
      },
      {
        "number": "3",
        "name": "VBAT",
        "type": "power_in",
        "description": "+3V lithium battery or other battery input that must be held between 2.0 V and 3.5 V for proper operation, and it keeps the RTC and RAM powered when VCC falls below VBAT."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "5",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Serial data input/output of the I2C interface; it is an open-drain pin that requires an external pull-up resistor."
      },
      {
        "number": "6",
        "name": "SCL",
        "type": "input",
        "description": "Serial clock input of the I2C interface; it is an open-drain pin that requires an external pull-up resistor."
      },
      {
        "number": "7",
        "name": "SQW/OUT",
        "type": "output",
        "description": "Square-wave output driver (1 Hz, 4.096 kHz, 8.192 kHz or 32.768 kHz when SQWE=1) or a static output level controlled by the OUT bit when square-wave output is disabled; it is an open-drain pin that requires an external pull-up resistor."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply input of +5 V; the datasheet specifies VCC from 4.5 V to 5.5 V."
      }
    ],
    "provenance": {
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        "pages_sent": 14,
        "cost_usd": 0.059,
        "at": "2026-10-18T12:26:28"
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        "total": 8,
        "described": 8,
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
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  "metadata": {
    "specs": {
      "Manufacturer": "HGSEMI",
      "Package": "MSOP-8",
      "Category": "Clock/Timing",
      "Pins": "8"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "99d95856b4d3f840893b52984a7b764d02ed4be716e26e677ba24fa01b9e4333",
      "rows": [
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          "name": "Supply voltage (recommended)",
          "symbol": "VCC",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4.5,
          "typ": 5,
          "max": 5.5,
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        },
        {
          "name": "Logic 1 input voltage",
          "symbol": "VIH",
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          "min": 2.2,
          "typ": null,
          "max": null,
          "conditions": "Max printed as VCC+0.3",
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        },
        {
          "name": "Logic 0 input voltage",
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          "typ": null,
          "max": 0.8,
          "conditions": "",
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        {
          "name": "Battery voltage",
          "symbol": "VBAT",
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          "unit": "V",
          "min": 2,
          "typ": null,
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        {
          "name": "Input leakage current (SCL)",
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        {
          "name": "I/O leakage current (SDA and SQW/OUT)",
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        {
          "name": "Logic 0 output voltage",
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          "min": null,
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          "max": 0.4,
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        },
        {
          "name": "Operating supply current",
          "symbol": "ICCA",
          "kind": "electrical",
          "unit": "mA",
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          "typ": null,
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        },
        {
          "name": "Standby current",
          "symbol": "ICCS",
          "kind": "electrical",
          "unit": "µA",
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          "typ": null,
          "max": 200,
          "conditions": "note 1: VCC, SDA and SCL = 5.0V",
          "source_page": 3,
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        },
        {
          "name": "Battery current (OSC ON, SQW/OUT OFF)",
          "symbol": "IBAT1",
          "kind": "electrical",
          "unit": "nA",
          "min": null,
          "typ": 300,
          "max": 500,
          "conditions": "SQW/OUT OFF; note 2: VCC=0V, VBAT=3V",
          "source_page": 3,
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        },
        {
          "name": "Battery current (OSC ON, SQW/OUT ON 32kHz)",
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          "min": null,
          "typ": 480,
          "max": 800,
          "conditions": "SQW/OUT ON (32kHz)",
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        },
        {
          "name": "Power-fail voltage",
          "symbol": "VPF",
          "kind": "electrical",
          "unit": "V",
          "min": 1.216,
          "typ": 1.25,
          "max": 1.284,
          "conditions": "Printed as 1.216×VBAT / 1.25×VBAT / 1.284×VBAT; note 8: VBAT=3.0V",
          "source_page": 3,
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        },
        {
          "name": "SCL clock frequency",
          "symbol": "fSCL",
          "kind": "timing",
          "unit": "kHz",
          "min": 0,
          "typ": null,
          "max": 100,
          "conditions": "",
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        },
        {
          "name": "Bus free time between STOP and START",
          "symbol": "tBUF",
          "kind": "timing",
          "unit": "µs",
          "min": 4.7,
          "typ": null,
          "max": null,
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        },
        {
          "name": "START condition hold time",
          "symbol": "tHDSTA",
          "kind": "timing",
          "unit": "µs",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "note 3",
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        {
          "name": "SCL low period",
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        {
          "name": "SCL high period",
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          "unit": "µs",
          "min": 4,
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        {
          "name": "START condition setup time",
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          "kind": "timing",
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          "min": 4.7,
          "typ": null,
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        },
        {
          "name": "Data hold time",
          "symbol": "tHDDAT",
          "kind": "timing",
          "unit": "µs",
          "min": 0,
          "typ": null,
          "max": null,
          "conditions": "notes 4, 5",
          "source_page": 4,
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        },
        {
          "name": "Data setup time",
          "symbol": "tSUDAT",
          "kind": "timing",
          "unit": "ns",
          "min": 250,
          "typ": null,
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        {
          "name": "SDA and SCL rise time",
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        {
          "name": "SDA and SCL fall time",
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          "kind": "timing",
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        {
          "name": "STOP condition setup time",
          "symbol": "tSUSTO",
          "kind": "timing",
          "unit": "µs",
          "min": 4.7,
          "typ": null,
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          "source": "datasheet"
        },
        {
          "name": "Capacitive load per bus",
          "symbol": "CB",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": null,
          "max": 400,
          "conditions": "note 6: sum of bus capacitances",
          "source_page": 4,
          "source": "datasheet"
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        {
          "name": "I/O capacitance",
          "symbol": "CI/O",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": null,
          "max": 10,
          "conditions": "TA=25℃",
          "source_page": 4,
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        },
        {
          "name": "Specified crystal load capacitance",
          "symbol": "",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 12.5,
          "max": null,
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          "source_page": 4,
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        {
          "name": "Storage temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 3,
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        {
          "name": "Voltage on any pin to GND",
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          "unit": "V",
          "min": -0.5,
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        },
        {
          "name": "Operating temperature (DS1307, non-Z grade)",
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          "kind": "absolute_maximum",
          "unit": "℃",
          "min": 0,
          "typ": null,
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          "conditions": "DS1307 commercial grade; DS1307Z (-40 to +85) excluded",
          "source_page": 3,
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        {
          "name": "Soldering temperature",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
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          "conditions": "10 s",
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    "name": "Ray",
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