PCF8563

@@ -0,0 +1,52 @@+# PCF8563++**NXP Semiconductors** · I2C real-time clock (alarm + timer) · SO-8++A low-power CMOS real-time clock and calendar with an I2C interface, in SO-8, one of the most common RTCs after the DS series. It keeps seconds through years with automatic leap-year handling from a 32.768 kHz crystal on OSCI/OSCO, and adds a programmable alarm, a countdown timer, a programmable clock output (CLKOUT), and a low-voltage detector, all of which raise the open-drain INT pin so the host is interrupted rather than polling. Bus speed is up to 400 kbit/s. Its very low timekeeping current suits coin-cell backup. Runs 1.0-5.5 V.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | OSCI | input | Oscillator input. Connect one terminal of the 32.768 kHz quartz crystal here. The device has an integrated oscillator capacitor (C_OSCO) so typically only the crystal is required between OSCI and OSCO. |+| 2 | OSCO | output | Oscillator output. Connect the other terminal of the 32.768 kHz quartz crystal here. Together with OSCI drives the on-chip oscillator that clocks the RTC. |+| 3 | INT | output | Interrupt output, open-drain, active LOW. Signals alarm and timer events; requires an external pull-up resistor to VDD. |+| 4 | VSS | power_in | Ground (0 V) reference for the device. |+| 5 | SDA | bidirectional | I2C-bus serial data input/output (open-drain). Requires external pull-up. Bus operates up to 400 kbit/s at VDD = 1.8 V to 5.5 V. Target address: A2h (write) / A3h (read). |+| 6 | SCL | input | I2C-bus serial clock input. Requires external pull-up. Maximum 400 kHz. |+| 7 | CLKOUT | output | Programmable square-wave clock output (open-drain). Selectable 32.768 kHz (default), 1.024 kHz, 32 Hz, or 1 Hz via CLKOUT_control register (0Dh). High-impedance when disabled; requires an external pull-up when used. |+| 8 | VDD | power_in | Supply voltage. Clock operates 1.0 V to 5.5 V (at room temperature); I2C-bus operation requires 1.8 V to 5.5 V. Typical backup current 0.25 μA at 3.0 V, 25 °C. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | I2C real-time clock/calendar |+| Timekeeping | seconds to year, BCD, leap-year |+| Extras | alarm + countdown timer + CLKOUT |+| Interrupt | open-drain INT (alarm/timer/LVD) |+| Bus | I2C up to 400 kbit/s |+| Timebase | 32.768 kHz crystal (OSCI/OSCO) |+| Supply voltage | 1.0-5.5 V |+| Package | SO-8 |++## Ordering variants++- `PCF8563T/5,518 (SO-8)`+- `PCF8563TS (TSSOP-8)`++## CAD (KiCad official)++- Symbol: `Timer_RTC:PCF8563T`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [NXP Semiconductors datasheet](https://www.nxp.com/docs/en/data-sheet/PCF8563.pdf) (50 pp, sha256 `2ed5d1b0a1051d0e`, retrieved 2026-08-17, tier: manufacturer)+- **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/pcf8563-datasheet.pdf)

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