DS1307ZN+T&R

@@ -0,0 +1,52 @@+# DS1307ZN+T&R++**Analog Devices Inc Maxim Integrated** · Real Time Clocks · SOP-8++DS1307ZN+T&R from Analog Devices Inc Maxim Integrated, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | X1 | input | Connection for a standard 32.768kHz quartz crystal (specified CL = 12.5pF). X1 is the input to the internal oscillator; it can alternatively be driven by an external 32.768kHz oscillator (in which case X2 must be floated). |+| 2 | X2 | output | Output of the internal 32.768kHz oscillator; the other terminal of the external quartz crystal connects here. Must be left floating if an external oscillator is driving X1. |+| 3 | VBAT | power_in | Backup supply input for a standard 3V lithium cell or other energy source (2.0V to 3.5V, 3V typ). Nominal power-fail trip point is 1.25 x VBAT. Must be tied to ground if a backup supply is not used. A 48mAh lithium cell backs up the DS1307 for >10 years at +25 degC. |+| 4 | GND | power_in | Ground reference (0V) for the device. |+| 5 | SDA | bidirectional | I2C serial data input/output. Open-drain output requiring an external pullup resistor; pullup voltage may be up to 5.5V independent of VCC. Input logic thresholds: VIL max 0.8V, VIH min 2.2V; VOL max 0.4V at IOL = 5mA. |+| 6 | SCL | input | I2C serial clock input (0 to 100kHz), used to synchronize data movement on the serial interface. Pullup voltage may be up to 5.5V regardless of VCC. |+| 7 | SQW/OUT | output | Square-wave/output driver. When the SQWE control-register bit is set, the pin outputs one of four square-wave frequencies (1Hz, 4.096kHz, 8.192kHz, or 32.768kHz). Open-drain; requires an external pullup (up to 5.5V). Operates from either VCC or VBAT; may be left floating if unused. |+| 8 | VCC | power_in | Primary power supply input (4.5V to 5.5V, 5.0V typ). When VCC is above 1.25 x VBAT the device operates from VCC; when VCC falls below VBAT the device switches to battery-backup mode and inhibits reads/writes while continuing timekeeping. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Analog Devices Inc Maxim Integrated |+| Package | SOP-8 |+| Category | Clock/Timing |+| Pins | 8 |++## Ordering variants++Same part, different packaging or reel option.++- `DS1307ZN+T&RZ+`+- `DS1307ZN+T&R`+- `DS1307ZN+T&RZ+T&R`+- `DS1307ZN+T&R+`++## CAD (KiCad official)++- Symbol: `DS1307ZN+T&R`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Analog Devices Inc Maxim Integrated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8551101105892040704) (14 pp, sha256 `4114781b89b9a71a`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ds1307zn-t-r-datasheet.pdf)

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