LK8563T from LANKE, 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	OSCI	input	32.768 kHz crystal oscillator input. Connect to one lead of an external 32.768 kHz quartz crystal (Rs=40 kΩ, CL=12.5 pF typical). Internal load capacitance is integrated (15/25/35 pF typical).
2	OSCO	output	32.768 kHz crystal oscillator output. Connect to the second lead of the external 32.768 kHz quartz crystal.
3	/INT	output	Open-drain interrupt output. Asserted low when an alarm (AF) or timer (TF) event occurs, per the TIE/AIE enable bits in control/status register 2. Requires an external pull-up resistor to VDD.
4	VSS	power_in	Ground reference (0 V).
5	SDA	bidirectional	I2C serial data line (open-drain). Slave addresses: 0A3H (read) / 0A2H (write). Bus speed up to 400 kHz. Requires external pull-up resistor (typ. 4.7 kΩ) to VDD.
6	SCL	input	I2C serial clock input, up to 400 kHz. Requires external pull-up resistor (typ. 4.7 kΩ) to VDD.
7	CLKOUT	output	Programmable open-drain clock output. Software-selectable frequency of 32.768 kHz (default), 1024 Hz, 32 Hz, or 1 Hz via the CLKOUT frequency register (0DH). High-impedance when disabled; requires external pull-up when enabled.
8	VDD	power_in	Positive supply voltage. Operating range 1.2 V to 5.5 V (1.8 V min for I2C at 400 kHz). Absolute maximum 6.5 V.

Key specifications

Parameter	Value
Manufacturer	LANKE
Package	SOP-8
Category	RTC
Pins	8

CAD (KiCad official)

Symbol: LK8563T
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lk8563t.step`	122 KB	You want the bare part, or you mark your own boards.
`lk8563t-etched.step`	1.7 MB	You want the part with `LK8563T` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 423 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: LANKE datasheet (17 pp, sha256 19c5303412fc54b3, retrieved 2026-08-17, 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: 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