DS89C21TMX

{
  "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"
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    "ds89c21tmx.step",
    "ds89c21tmx.lbr",
    "docs/hero.png",
    "docs/ds89c21tmx-datasheet.pdf",
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  "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": {
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      "footprint": "ds89c21tmx.kicad_mod",
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      "model_3d_step": "ds89c21tmx-etched.step",
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      "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": {
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        "primary_mode": "text+vision",
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        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
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        "cost_usd": 0.4876,
        "at": "2026-09-24T08:21:21"
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      "datasheet": {
        "url": "https://www.ti.com/cn/lit/gpn/ds89c21",
        "pages": 16,
        "sha256": "b726d09ebb2243f6",
        "source_tier": "lcsc"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
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        "zmin_mm": -0.0,
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}