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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownDS89C21TMX
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ds89c21tmx.step/ds89c21tmx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (16 pp, sha256
b726d09ebb2243f6, retrieved 2026-09-24, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-sonnet-5(text+vision), consensusclaude-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).