# DS1307M

**HGSEMI** · Real Time Clocks · SOP-8

DS1307M from HGSEMI, 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 | passive | 32.768 kHz crystal connection pin with 12.5 pF specified load capacitance, or external oscillator input |
| 2 | X2 | passive | 32.768 kHz crystal connection pin; leave floating when external oscillator is connected to X1 |
| 3 | VBAT | power_in | Battery backup power supply input; operating voltage 2.0 V to 3.5 V |
| 4 | GND | power_in | Ground reference potential |
| 5 | SDA | bidirectional | I2C serial data input/output; open-drain pin requires external pull-up resistor |
| 6 | SCL | bidirectional | I2C serial clock input; open-drain pin requires external pull-up resistor and supports 0 to 100 kHz frequency |
| 7 | SQW/OUT | tri_state | Programmable square wave output or fixed logic level; selectable frequencies 1 Hz/4.096 kHz/8.192 kHz/32.768 kHz; open-drain requires external pull-up resistor |
| 8 | VCC | power_in | Power supply input; operating voltage range 4.5 V to 5.5 V with typical 5.0 V |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HGSEMI |
| Package | SOP-8 |
| Category | Clock/Timing |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `DS1307M`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `ds1307m-etched.step` / `ds1307m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ds1307m.step` / `ds1307m.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [HGSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8756372549431508992) (14 pp, sha256 `99d95856b4d3f840`, retrieved 2026-09-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ds1307m-datasheet.pdf)