LK8563S from LANKE, in a MSOP-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	Oscillator input. Connects to one terminal of the external 32.768 kHz crystal. Internal load capacitance (C_INT) typ. 25 pF; recommended crystal Rs <= 40 kOhm, C_L = 12.5 pF.
2	OSCO	output	Oscillator output. Connects to the other terminal of the external 32.768 kHz crystal to form the RTC time base.
3	/INT	output	Active-low interrupt output, open-drain. Asserted by alarm, timer, or brown-out events; 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). Requires an external pull-up resistor (typ. 4.7 kOhm) to VDD. Slave address 0xA2 (write) / 0xA3 (read); up to 400 kbit/s.
6	SCL	input	I2C serial clock input. Requires an external pull-up resistor (typ. 4.7 kOhm) to VDD. Max clock 400 kHz.
7	CLKOUT	output	Programmable clock output, open-drain. Software-selectable frequencies: 32.768 kHz, 1024 Hz, 32 Hz, or 1 Hz. Requires an external pull-up resistor to VDD.
8	VDD	power_in	Positive supply. Operating range 1.2 V to 5.5 V for timekeeping; 1.8 V to 5.5 V for I2C at 400 kHz. Absolute maximum 6.5 V.

Key specifications

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

CAD (KiCad official)

Symbol: LK8563S
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lk8563s.step`	123 KB	You want the bare part, or you mark your own boards.
`lk8563s-etched.step`	1.9 MB	You want the part with `LK8563S` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 463 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