RX8025T-UB

@@ -0,0 +1,53 @@+# RX8025T-UB++**Seiko Epson** · Real-time Clocks (RTC) · SOP-14-208mil++RX8025T-UB from Seiko Epson, in a SOP-14-208mil. 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 | T1/CE | input | Manufacturer test pin (T1, also labeled CE). Must be left unconnected externally. |+| 2 | SCL | input | I2C serial clock input. Fmax = 400 kHz (Fast-mode). Requires external pull-up to VDD; no internal ESD diode to VDD, allowing level-shifted operation. |+| 3 | FOUT | output | CMOS 32.768 kHz clock output. Enabled when FOE = H (outputs 32.768 kHz); when disabled the pin is Hi-Z. Drive per DC characteristics (e.g. VOH >= 2.9 V at IOH = -100 uA, VDD = 3 V). |+| 4 | NC | unconnected | Not connected to the internal IC. Leave open or tie to GND or VDD. |+| 5 | TEST | input | Manufacturer test pin. Must be left unconnected externally. |+| 6 | VDD | power_in | Positive supply pin. Interface operating range 1.6-5.5 V (typ. 3.0 V); time-keeping down to 1.2 V. Bypass with at least 0.1 uF between VDD and GND. |+| 7 | FOE | input | FOUT output enable. Level 'H' enables the 32.768 kHz FOUT output; level 'L' places FOUT in Hi-Z. VIH >= 0.8*VDD, VIL <= 0.2*VDD. |+| 8 | NC | unconnected | Not connected to the internal IC. Leave open or tie to GND or VDD. |+| 9 | NC | unconnected | Not connected to the internal IC. Leave open or tie to GND or VDD. |+| 10 | /INT | output | Open-drain interrupt output for alarm, fixed-cycle timer, and time-update events. Asserts low when an interrupt fires; requires external pull-up. VOL <= GND+0.25 V at IOL = 1 mA, VDD = 5 V. |+| 11 | GND | power_in | Module ground reference (0 V). |+| 12 | T2/VPP | passive | Manufacturer test pin (T2, also labeled VPP). Must be left unconnected externally. |+| 13 | SDA | bidirectional | I2C serial data (address/data/ACK). N-channel open-drain output; requires external pull-up sized for the bus capacitance. No internal VDD diode, supports level-shifted buses. |+| 14 | NC | unconnected | Not connected to the internal IC. Leave open or tie to GND or VDD. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Seiko Epson |+| Package | SOP-14-208mil |+| Category | RTC |+| Pins | 14 |++## Ordering variants++- `RX8025T-UBUB`++## CAD (KiCad official)++- Symbol: `RX8025T-UB`+- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`+- 3D model: SOP-14-208mil (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Seiko Epson datasheet](docs/rx8025t-ub-datasheet.pdf) (33 pp, sha256 `e061d6f8feb4ec7e`, 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/rx8025t-ub-datasheet.pdf)

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