# TXS0108E 8-Bit Level Shifter Molecule

An Adom molecule breakout for the **Texas Instruments TXS0108E**, an 8-bit bidirectional voltage-level translator. Designed for the Adom machine-pin ecosystem with medium-pitch contacts.

## Overview

The TXS0108E translates 8 channels bidirectionally between two voltage domains (VCCA: 1.2–3.6 V, VCCB: 1.65–5.5 V). This molecule breaks out all 8 data channels plus power and OE to Adom machine-pin contacts for plug-in use on baseboard layouts.

| Parameter | Value |
|-----------|-------|
| IC | TXS0108ERGYR (TI, VQFN-20) |
| Channels | 8 bidirectional |
| VCCA range | 1.2 V – 3.6 V |
| VCCB range | 1.65 V – 5.5 V |
| Data rate | Up to 110 Mbps (push-pull) |
| OE pin | Active-high output enable |

## Pin Map

| Contact | Signal | Side | Description |
|---------|--------|------|-------------|
| A1 | VCCA | Left | Low-voltage supply |
| A2 | A1 | Left | Port A channel 1 |
| A3 | A2 | Left | Port A channel 2 |
| A4 | A3 | Left | Port A channel 3 |
| A5 | A4 | Left | Port A channel 4 |
| A6 | A5 | Left | Port A channel 5 |
| A7 | A6 | Left | Port A channel 6 |
| A8 | A7 | Left | Port A channel 7 (active low on silk) |
| B1 | VCCB | Right | High-voltage supply |
| B2 | B1 | Right | Port B channel 1 |
| B3 | B2 | Right | Port B channel 2 |
| B4 | B3 | Right | Port B channel 3 |
| B5 | B4 | Right | Port B channel 4 |
| B6 | B5 | Right | Port B channel 5 |
| B7 | B6 | Right | Port B channel 6 |
| B8 | B7 | Right | Port B channel 7 |
| GND | GND | Bottom-left | Ground |
| OE | OE | Bottom-right | Output enable (active high, pulled high via 100 kΩ) |

## Components

| Ref | Value | Package | Library |
|-----|-------|---------|---------|
| U4 | TXS0108ERGYR | IC_TXS0108ERGYR | TXS0108ERGYR |
| C3 | 100 nF | 0603 (CAPC1608X85) | Adom JLCPCB Library |
| C4 | 100 nF | 0603 (CAPC1608X85) | Adom JLCPCB Library |
| R5 | 100 kΩ | 0603 | Adom JLCPCB Library |
| A1–A8 | Machine pin contact | CONTACT_MED | Adom_Library_Master |
| B1–B8 | Machine pin contact | CONTACT_MED | Adom_Library_Master |
| GND, OE, VCCA, VCCB | Machine pin (short) | MACH_PIN_MED_SHORT | Adom_Library_Master |

## Design Notes

- **Bypass caps** (C3, C4) are 100 nF ceramic on both VCCA and VCCB rails, placed close to the IC
- **OE pull-up** (R5) is 100 kΩ to VCCB — output enable defaults to active (high) so the level shifter is always on unless OE is driven low
- **Bidirectional auto-direction sensing** — no direction pin needed; the TXS0108E detects which side is driving
- **Machine pin contacts** use the medium-pitch Adom contact system for plug-in integration with baseboards

## Fusion 360 Cloud Location

```
Main > Molecules > XRP > TimeOfFlightVL53L8 > TXS0108E_8bitLevelShifter.fprj
```

## Export Files

Available in the Fusion 360 Output folder on Google Drive:

- `TXS0108E_8bitLevelShifter v23.brd` — EAGLE board file
- `TXS0108E_8bitLevelShifter v14.sch` — Schematic file
- `TXS0108E_8bitLevelShifter v23.f3d` — Fusion 360 archive (3D)
- `TXS0108E_8bitLevelShifter v23.usdz` — 3D model for AR/Hydrogen
- Silkscreen top/bottom PNGs
- `board_parts.json`, `board_outline.json`, `board_netlist.json`