UM3488EESA

@@ -0,0 +1,50 @@+# UM3488EESA++**Union Semiconductor** · RS-485/RS-422 ICs · SOP-8++UM3488EESA from Union Semiconductor, 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 input. Operating range 3.135V ≤ VCC ≤ 3.465V (nominal +3.3V ±5%). Absolute maximum +7V. Typical quiescent current 180µA. |+| 2 | RO | output | Receiver output. RO is high when the receiver differential input A−B ≥ −50mV, and low when A−B ≤ −200mV. CMOS-level output; VOH ≥ VCC−0.4V at IO=−4mA, VOL ≤ 0.4V at IO=4mA. |+| 3 | DI | input | Driver input. A logic low on DI forces the non-inverting output (Y) low and the inverting output (Z) high; a logic high on DI drives Y high and Z low. VIH ≥ 2.0V, VIL ≤ 0.8V, ~100mV input hysteresis. |+| 4 | GND | power_in | Device ground reference. All voltages are referred to this pin unless otherwise noted. |+| 5 | Y | output | Non-inverting differential driver output (RS-422). Driven high or low relative to Z per DI state, always enabled on UM3488 (no DE pin). ±15kV HBM ESD protected; short-circuit current ±250mA. |+| 6 | Z | output | Inverting differential driver output (RS-422), complementary to Y. Always enabled on UM3488. ±15kV HBM ESD protected; short-circuit current ±250mA. |+| 7 | B | input | Inverting differential receiver input (RS-422). Together with A forms the receiver differential pair; VTH typ −125mV. Fail-safe guarantees RO=high if the bus is open, shorted, or terminated with no active driver. 1/8-unit-load input (RIN ≥ 96kΩ) allowing 256 transceivers on the bus. |+| 8 | A | input | Non-inverting differential receiver input (RS-422). Together with B forms the receiver differential pair. Common-mode range −7V to +12V; ±15kV HBM ESD protected; 1/8-unit-load (RIN ≥ 96kΩ). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Union Semiconductor |+| Package | SOP-8 |+| Category | Comm/UART |+| Pins | 8 |++## Ordering variants++- `UM3488EESA`+- `UM3488EESAEEPA`+- `UM3488EESAEESE`+- `UM3488EESAEEPE`++## CAD (KiCad official)++- Symbol: `UM3488EESA`+- 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:** [Union Semiconductor datasheet](docs/um3488eesa-datasheet.pdf) (17 pp, sha256 `64342b95d538e6d2`, 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/um3488eesa-datasheet.pdf)

@@ -0,0 +1,34 @@+{+  "slug": "um3488eesa",+  "version": "0.1.0",+  "type": "component",+  "description": "Union Semiconductor RS-485/RS-422 ICs, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.",+  "tags": [+    "component",+    "comm-uart",+    "um3488eesa"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "um3488eesa.kicad_sym",+    "um3488eesa.kicad_mod",+    "um3488eesa.glb",+    "um3488eesa.step",+    "um3488eesa.lbr",+    "docs/hero.png",+    "docs/um3488eesa-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file