DS1307Z+

{
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  "type": "component",
  "slug": "ds1307z",
  "title": "DS1307Z+",
  "brief": "Analog Devices Inc Maxim Integrated Real Time Clocks, SO-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",
    "ds1307z+",
    "factory-2.0.0",
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  "component": {
    "mpn": "DS1307Z+",
    "manufacturer": "Analog Devices Inc Maxim Integrated",
    "package": "SO-8",
    "pin_count": 8,
    "category": "Clock/Timing",
    "subcategory": "Real Time Clocks",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588926153226113024",
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    "distributor_links": {
      "lcsc": "C1520446",
      "digikey": "DS1307Z+-ND",
      "mouser": "700-DS1307Z"
    },
    "distributor_check": {
      "checked_at": "2026-10-20T23:08:12Z",
      "source": "Component Ocean /api/assign-pns",
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    "pins": [
      {
        "number": "1",
        "name": "X1",
        "type": "input",
        "description": "Input to the internal oscillator, designed for a 32.768kHz crystal with a specified 12.5pF load capacitance, and can optionally be driven by an external 32.768kHz oscillator."
      },
      {
        "number": "2",
        "name": "X2",
        "type": "passive",
        "description": "Output of the internal oscillator for the crystal connection, which is left floating when an external oscillator is connected to X1."
      },
      {
        "number": "3",
        "name": "VBAT",
        "type": "power_in",
        "description": "Backup supply input for a 3V lithium cell or other energy source, which must be held between 2.0V and 3.5V for proper operation, and must be grounded if no backup supply is used."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "5",
        "name": "SDA",
        "type": "bidirectional",
        "description": "Serial data input/output for the I2C interface; the open-drain pin requires an external pullup whose voltage can be up to 5.5V regardless of VCC."
      },
      {
        "number": "6",
        "name": "SCL",
        "type": "input",
        "description": "Serial clock input for the I2C interface, with a pullup voltage that can be up to 5.5V regardless of VCC."
      },
      {
        "number": "7",
        "name": "SQW/OUT",
        "type": "output",
        "description": "Open-drain square-wave/output driver that outputs one of four square-wave frequencies when enabled, requires an external pullup up to 5.5V regardless of VCC, and can be left floating if not used."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Primary power supply, specified at 4.5V to 5.5V; when a backup supply is connected and VCC is below VTP, reads and writes are inhibited while timekeeping continues."
      }
    ],
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        "guard_notes": [
          "extractor flagged: Square-wave frequencies differ within the datasheet: the SQW/OUT pin description lists 4kHz and 8kHz; The datasheet does not give an ERC class for X2. It is typed as passive because it is a crystal term; Pin numbers come from the PIN DESCRIPTION table on page 6. The pin configuration figure's text extra"
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        "at": "2026-10-20T23:05:58"
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        "total": 8,
        "described": 8,
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    "specs": {
      "Manufacturer": "Analog Devices Inc Maxim Integrated",
      "Package": "SO-8",
      "Category": "Clock/Timing",
      "Pins": "8"
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          "name": "Operating Temperature Range",
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          "name": "Storage Temperature Range",
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          "name": "Input Leakage (SCL)",
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          "name": "I/O Leakage (SDA, SQW/OUT)",
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          "name": "Logic 0 Output",
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          "conditions": "IOL = 5mA; VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
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        },
        {
          "name": "Active Supply Current",
          "symbol": "ICCA",
          "kind": "electrical",
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          "conditions": "fSCL = 100kHz; VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
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        {
          "name": "Standby Current",
          "symbol": "ICCS",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
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          "conditions": "Note 3: VCC = 5.0V, SDA and SCL = 5.0V; TA = 0°C to +70°C, TA = -40°C to +85°C",
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          "name": "VBAT Leakage Current",
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          "name": "Power-Fail Voltage (x VBAT)",
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          "conditions": "VBAT = 3.0V; VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
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          "name": "VBAT Data-Retention Current (Oscillator Off)",
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        {
          "name": "SCL Clock Frequency",
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          "kind": "timing",
          "unit": "kHz",
          "min": 0,
          "typ": null,
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          "conditions": "VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
          "source_page": 3,
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        {
          "name": "Bus Free Time Between a STOP and START Condition",
          "symbol": "tBUF",
          "kind": "timing",
          "unit": "µs",
          "min": 4.7,
          "typ": null,
          "max": null,
          "conditions": "VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
          "source_page": 3,
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        {
          "name": "Hold Time (Repeated) START Condition",
          "symbol": "tHD:STA",
          "kind": "timing",
          "unit": "µs",
          "min": 4,
          "typ": null,
          "max": null,
          "conditions": "Note 4; VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
          "source_page": 3,
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        },
        {
          "name": "LOW Period of SCL Clock",
          "symbol": "tLOW",
          "kind": "timing",
          "unit": "µs",
          "min": 4.7,
          "typ": null,
          "max": null,
          "conditions": "VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
          "source_page": 3,
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        },
        {
          "name": "HIGH Period of SCL Clock",
          "symbol": "tHIGH",
          "kind": "timing",
          "unit": "µs",
          "min": 4,
          "typ": null,
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          "conditions": "VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
          "source_page": 3,
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        },
        {
          "name": "Setup Time for a Repeated START Condition",
          "symbol": "tSU:STA",
          "kind": "timing",
          "unit": "µs",
          "min": 4.7,
          "typ": null,
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          "conditions": "VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
          "source_page": 3,
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        },
        {
          "name": "Data Hold Time",
          "symbol": "tHD:DAT",
          "kind": "timing",
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          "min": 0,
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          "conditions": "VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
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        {
          "name": "Data Setup Time",
          "symbol": "tSU:DAT",
          "kind": "timing",
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          "conditions": "Notes 5, 6; VCC = 4.5V to 5.5V; TA = 0°C to +70°C, TA = -40°C to +85°C",
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          "name": "Rise Time of Both SDA and SCL Signals",
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          "name": "Fall Time of Both SDA and SCL Signals",
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          "name": "Setup Time for STOP Condition",
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          "name": "Pin Capacitance (SDA, SCL)",
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          "name": "Capacitance Load for Each Bus Line",
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