# DS3231MZ+TRL

**Analog Devices Inc Maxim Integrated** · Real Time Clocks · SOIC-8

DS3231MZ+TRL from Analog Devices Inc Maxim Integrated, in a SOIC-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 | 32KHZ | output | 32.768kHz output (50% duty cycle). Open-drain; requires an external pullup (up to 5.5V). Enabled via the EN32KHZ bit in the Status register (0Fh); operates on either VCC or VBAT. Leave open if unused. |
| 2 | VCC | power_in | DC power pin for primary power supply (2.3V-5.5V). Decouple with a 0.1µF-1.0µF capacitor. Tie to GND if not used (VBAT-only operation). |
| 3 | INT/SQW | output | Active-low interrupt or 1Hz square-wave output. Open-drain; requires an external pullup to ≤5.5V. Function selected by the INTCN bit in Control register (0Eh): INTCN=0 outputs 1Hz square wave; INTCN=1 outputs alarm-match interrupt. Defaults to interrupt with alarms disabled at power-up. Leave open if unused. |
| 4 | RST | bidirectional | Active-low reset I/O. Open-drain output driven low when VCC < VPF; released high through an internal ~50kΩ pullup (RPU) to VCC after tRST once VCC exceeds VPF. Also acts as a debounced pushbutton input - pulling it low triggers a reset request. No external pullup required. If the oscillator is disabled, tREC is bypassed and RST immediately goes high. |
| 5 | GND | power_in | Device ground reference. |
| 6 | VBAT | power_in | Backup power-supply input (2.3V-5.5V). Provides continuous timekeeping when VCC falls below VPF. Decouple with a 0.1µF-1.0µF low-leakage capacitor when used as primary supply; no cap required when used only as backup. Tie to GND if unused. UL-recognized against reverse charging for use with primary lithium cells. |
| 7 | SDA | bidirectional | I2C serial data input/output. Open-drain; requires an external pullup (may be pulled to any voltage up to 5.5V regardless of VCC). Supports fast-mode (400kHz) and standard-mode I2C. |
| 8 | SCL | input | I2C serial clock input. Synchronizes data on the I2C bus. Pullup voltage may be up to 5.5V regardless of VCC. Supports 400kHz fast-mode I2C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc Maxim Integrated |
| Package | SOIC-8 |
| Category | Clock/Timing |
| Pins | 8 |

## Ordering variants

Same part, different packaging or reel option.

- `DS3231MZ+TRL`
- `DS3231MZ+TRLMZ/V+`
- `DS3231MZ+TRLM+`

## CAD (KiCad official)

- Symbol: `DS3231MZ+TRL`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ds3231mz-trl-etched.step` / `ds3231mz-trl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ds3231mz-trl.step` / `ds3231mz-trl.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Analog Devices Inc Maxim Integrated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586180066687012864) (20 pp, sha256 `dcc1cd00b353b9f3`, 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/ds3231mz-trl-datasheet.pdf)