SL8563T from Slkor SLKORMICRO Elec, 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 terminal of the external 32.768 kHz crystal. Internal 12.5 pF load capacitor is provided so no external load caps are required. Crystal ESR must be <= 70 kΩ.
2	OSCO	output	32.768 kHz crystal oscillator output. Connect to the other terminal of the external 32.768 kHz crystal. Works with OSCI to form the DTCXO reference; internal 12.5 pF load cap included.
3	INTN	output	Interrupt output, N-channel open-drain structure. Requires an external pull-up resistor to VDD. Asserts on programmed alarm, periodic, or time-update interrupt events. VOL <= 0.3 V @ IOH = -1 mA.
4	VSS	power_in	Ground reference for the device (0 V).
5	SDA	bidirectional	I2C bus serial data line. Open-drain, requires external pull-up resistor to VDD. Supports Fast-mode (up to 400 kHz). VIL = 0 to 0.3·VDD; VIH = 0.7·VDD to VDD.
6	SCL	input	I2C bus serial clock input. Supports Fast-mode clock rates up to 400 kHz. Requires external pull-up resistor to VDD.
7	CLKOUT	output	Programmable clock output, CMOS push-pull. Selectable frequency 32.768 kHz / 1024 Hz / 1 Hz. Can drive up to 30 pF load capacitance; 50% duty cycle over 1.6 V to 5.5 V.
8	VDD	power_in	Positive supply pin. Clock circuit operating range 1.6 V to 5.5 V; I2C interface operating range 2.0 V to 5.5 V. Typical quiescent current 2.3 μA @ 3 V with CLKOUT disabled. Decouple with a 1 μF capacitor to VSS.

Key specifications

Parameter	Value
Manufacturer	Slkor SLKORMICRO Elec
Package	SOP-8
Category	RTC
Pins	8

CAD (KiCad official)

Symbol: SL8563T
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Slkor SLKORMICRO Elec datasheet (2 pp, sha256 c9a89f64f50fe4e3, 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