# RS244YS20

**Jiangsu RUNIC Tech** · Buffer/Driver/Transceiver · SOP-20

RS244YS20 from Jiangsu RUNIC Tech, in a SOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | 1OE | input | Active-low output enable for the 1Y outputs; pulling it HIGH places all 1Y outputs in the high-impedance 3-state mode. |
| 2 | 1A0 | input | Non-inverting data input of the 1A0 channel, passed to its Y output when the output enable is LOW. |
| 3 | 2Y0 | output | 3-state buffered output that follows its A-port input when enabled and goes high-impedance when its output enable is HIGH. |
| 4 | 1A1 | input | Non-inverting data input of the 1A1 channel, passed to its Y output when the output enable is LOW. |
| 5 | 2Y1 | output | 3-state buffered output that follows its A-port input when enabled and goes high-impedance when its output enable is HIGH. |
| 6 | 1A2 | input | Non-inverting data input of the 1A2 channel, passed to its Y output when the output enable is LOW. |
| 7 | 2Y2 | output | 3-state buffered output that follows its A-port input when enabled and goes high-impedance when its output enable is HIGH. |
| 8 | 1A3 | input | Non-inverting data input of the 1A3 channel, passed to its Y output when the output enable is LOW. |
| 9 | 2Y3 | output | 3-state buffered output that follows its A-port input when enabled and goes high-impedance when its output enable is HIGH. |
| 10 | GND | power_in | Ground reference for the device. |
| 11 | 2A3 | input | Non-inverting data input of the 2A3 channel, passed to its Y output when the output enable is LOW. |
| 12 | 1Y3 | output | 3-state buffered output that follows its A-port input when enabled and goes high-impedance when its output enable is HIGH. |
| 13 | 2A2 | input | Non-inverting data input of the 2A2 channel, passed to its Y output when the output enable is LOW. |
| 14 | 1Y2 | output | 3-state buffered output that follows its A-port input when enabled and goes high-impedance when its output enable is HIGH. |
| 15 | 2A1 | input | Non-inverting data input of the 2A1 channel, passed to its Y output when the output enable is LOW. |
| 16 | 1Y1 | output | 3-state buffered output that follows its A-port input when enabled and goes high-impedance when its output enable is HIGH. |
| 17 | 2A0 | input | Non-inverting data input of the 2A0 channel, passed to its Y output when the output enable is LOW. |
| 18 | 1Y0 | output | 3-state buffered output that follows its A-port input when enabled and goes high-impedance when its output enable is HIGH. |
| 19 | 2OE | input | Active-low output enable for the 2Y outputs; pulling it HIGH places all 2Y outputs in the high-impedance 3-state mode. |
| 20 | VCC | power_in | Supply voltage, specified from 1.65 V to 5.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOP-20 |
| Category | Logic ICs |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `RS244YS20`
- Footprint: `Package_SO:SOP-20_7.5x12.8mm_P1.27mm`
- 3D model: SOP-20 (KiCad packages3D, STEP)
- 3D model files: `rs244ys20-etched.step` / `rs244ys20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs244ys20.step` / `rs244ys20.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Jiangsu RUNIC Tech datasheet](docs/rs244ys20-datasheet.pdf) (14 pp, sha256 `f42c0f1a0eb2c483`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/rs244ys20-datasheet.pdf)