component
DS89C21TMX
Public Made by Adomby adom
Texas Instruments RS-485 / RS-422 ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+44@@ -0,0 +1,44 @@+# DS89C21TMX++**Texas Instruments** · RS-485 / RS-422 ICs · SOIC-8++DS89C21TMX from Texas Instruments, in a SOIC-8. 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 | VCC | power_in | Supply voltage pin; recommended operating range 4.50V to 5.50V, absolute maximum 7V. |+| 2 | RO | output | Receiver TTL/CMOS-compatible output; drives HIGH (VOH 3.8-4.9V typ, IOH=-6mA) when RI-RI* differential input is ≥+200mV or open, and LOW (VOL ≤0.3V, IOL=6mA) when differential input is ≤-200mV. |+| 3 | DI | input | Driver TTL/CMOS-compatible input; VIH 2.0V to VCC, VIL GND to 0.8V; HIGH level drives DO high and DO* low. |+| 4 | GND | power_in | Ground reference pin for the device. |+| 5 | DO* | output | Inverting (complementary) differential driver output; differential output voltage 2.0-3.0V into a 100Ω load, complementary to DO. |+| 6 | DO | output | Non-inverting differential driver output; unloaded output voltage 4.2-6.0V, differential output voltage 2.0-3.0V into a 100Ω load, follows DI input state. |+| 7 | RI* | input | Inverting differential receiver input; differential threshold ±200mV, absolute maximum input voltage ±14V, input impedance 5.0-9.5kΩ. |+| 8 | RI | input | Non-inverting differential receiver input; differential threshold ±200mV (failsafe HIGH output when open/non-terminated), absolute maximum input voltage ±14V, input impedance 5.0-9.5kΩ. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-8 |+| Category | Interface |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `DS89C21TMX`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)+- 3D model files: `ds89c21tmx-etched.step` / `ds89c21tmx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ds89c21tmx.step` / `ds89c21tmx.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ds89c21) (16 pp, sha256 `b726d09ebb2243f6`, retrieved 2026-09-24, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-sonnet-5` (text+vision), consensus `claude-opus-4-8` (agreed), 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/ds89c21tmx-datasheet.pdf)
page.jsonadded+143@@ -0,0 +1,143 @@+{+ "slug": "ds89c21tmx",+ "version": "0.1.0",+ "type": "component",+ "description": "Texas Instruments RS-485 / RS-422 ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",+ "tags": [+ "component",+ "interface",+ "ds89c21tmx",+ "factory-2.0.0",+ "extractor-text"+ ],+ "dependencies": {},+ "hero": {+ "type": "image",+ "path": "docs/hero.png"+ },+ "files": [+ "page.json",+ "README.md",+ "ds89c21tmx.kicad_sym",+ "ds89c21tmx.kicad_mod",+ "ds89c21tmx.glb",+ "ds89c21tmx.step",+ "ds89c21tmx.lbr",+ "docs/hero.png",+ "docs/ds89c21tmx-datasheet.pdf",+ "viewers/symbol.html",+ "viewers/footprint.html"+ ],+ "component": {+ "mpn": "DS89C21TMX",+ "manufacturer": "Texas Instruments",+ "package": "SOIC-8",+ "pin_count": 8,+ "category": "Interface",+ "subcategory": "RS-485 / RS-422 ICs",+ "datasheet": "https://www.ti.com/cn/lit/gpn/ds89c21",+ "parts": {+ "symbol": "ds89c21tmx.kicad_sym",+ "footprint": "ds89c21tmx.kicad_mod",+ "model_3d": "ds89c21tmx-etched.glb",+ "model_3d_plain": "ds89c21tmx.glb",+ "model_3d_step": "ds89c21tmx-etched.step",+ "model_3d_step_plain": "ds89c21tmx.step",+ "lbr": "ds89c21tmx.lbr"+ },+ "distributor_links": {+ "lcsc": "C181541"+ },+ "pins": [+ {+ "number": "1",+ "name": "VCC",+ "type": "power_in",+ "description": "Supply voltage pin; recommended operating range 4.50V to 5.50V, absolute maximum 7V."+ },+ {+ "number": "2",+ "name": "RO",+ "type": "output",+ "description": "Receiver TTL/CMOS-compatible output; drives HIGH (VOH 3.8-4.9V typ, IOH=-6mA) when RI-RI* differential input is ≥+200mV or open, and LOW (VOL ≤0.3V, IOL=6mA) when differential input is ≤-200mV."+ },+ {+ "number": "3",+ "name": "DI",+ "type": "input",+ "description": "Driver TTL/CMOS-compatible input; VIH 2.0V to VCC, VIL GND to 0.8V; HIGH level drives DO high and DO* low."+ },+ {+ "number": "4",+ "name": "GND",+ "type": "power_in",+ "description": "Ground reference pin for the device."+ },+ {+ "number": "5",+ "name": "DO*",+ "type": "output",+ "description": "Inverting (complementary) differential driver output; differential output voltage 2.0-3.0V into a 100Ω load, complementary to DO."+ },+ {+ "number": "6",+ "name": "DO",+ "type": "output",+ "description": "Non-inverting differential driver output; unloaded output voltage 4.2-6.0V, differential output voltage 2.0-3.0V into a 100Ω load, follows DI input state."+ },+ {+ "number": "7",+ "name": "RI*",+ "type": "input",+ "description": "Inverting differential receiver input; differential threshold ±200mV, absolute maximum input voltage ±14V, input impedance 5.0-9.5kΩ."+ },+ {+ "number": "8",+ "name": "RI",+ "type": "input",+ "description": "Non-inverting differential receiver input; differential threshold ±200mV (failsafe HIGH output when open/non-terminated), absolute maximum input voltage ±14V, input impedance 5.0-9.5kΩ."+ }+ ],+ "provenance": {+ "extractor": "extract_pins 0.2",+ "factory_chain": {+ "factory": "2.0.0",+ "extractor": "extract_pins 0.2",+ "primary_model": "claude-sonnet-5",+ "primary_mode": "text+vision",+ "consensus_model": "claude-opus-4-8",+ "consensus": "agreed",+ "guards": "pin_guards 0.1: passed",+ "guard_notes": [+ "vision extraction: provenance cannot be text-verified; needs consensus"+ ],+ "pages_sent": 16,+ "cost_usd": 0.4876,+ "at": "2026-09-24T08:21:21"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/ds89c21",+ "pages": 16,+ "sha256": "b726d09ebb2243f6",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 8,+ "described": 8,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ }+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}