GM490E

@@ -0,0 +1,43 @@+# GM490E++**GATEMODE** · RS-485/RS-422 ICs · SOP-8++GM490E from GATEMODE, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VCC | power_in | Positive supply. 4.75V ≤ VCC ≤ 5.25V (5V ±5%). Absolute max 6.5V. Bypass with a 0.1µF capacitor to GND. |+| 2 | RO | output | Receiver Output. If A−B > 200mV, RO is high; if A−B < −200mV, RO is low. VOH ≥ 3.5V at −4mA, VOL ≤ 0.4V at 4mA. Fail-safe high with open inputs. |+| 3 | DI | input | Driver Input. A low on DI forces output Y low and output Z high; a high on DI forces Y high and Z low. VIH ≥ 2.0V, VIL ≤ 0.8V. |+| 4 | GND | power_in | Device ground reference. All voltages are referenced to this pin. |+| 5 | Y | output | Non-inverting Driver Output (RS-485/RS-422 bus line). Differential driver output pair with Z; VOD ≥ 1.5V into 27Ω (RS-485) or ≥ 2V into 50Ω (RS-422). ±15kV HBM ESD protection, short-circuit current limited (35-250mA) with thermal shutdown. |+| 6 | Z | output | Inverting Driver Output (RS-485/RS-422 bus line). Complementary to Y. ±15kV HBM ESD protection, short-circuit current limited (35-250mA) with thermal shutdown. |+| 7 | B | input | Inverting Receiver Input (RS-485/RS-422 bus line). Differential input with A; ΔVTH ±200mV, 70mV typ hysteresis, 96kΩ min input resistance (1/8 unit load, allows up to 256 nodes). Input range −7V ≤ VCM ≤ 12V. ±15kV HBM ESD protection. |+| 8 | A | input | Non-inverting Receiver Input (RS-485/RS-422 bus line). Differential input with B; ΔVTH ±200mV, 70mV typ hysteresis, 96kΩ min input resistance (1/8 unit load). Input range −7V ≤ VCM ≤ 12V. ±15kV HBM ESD protection. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | GATEMODE |+| Package | SOP-8 |+| Category | Comm/UART |+| Pins | 8 |++## CAD (KiCad official)++- Symbol: `GM490E`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [GATEMODE datasheet](docs/gm490e-datasheet.pdf) (15 pp, sha256 `60d66baeea28e06f`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/gm490e-datasheet.pdf)

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