SSP3485

@@ -0,0 +1,48 @@+# SSP3485++**Shanghai Siproin Microelectronics** · RS-485 / RS-422 ICs · SOP-8++SSP3485 from Shanghai Siproin Microelectronics, 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 | RO | output | Receiver output. Drives high when A-B ≥ -0.05 V, low when A-B ≤ -0.2 V, and high when A and B are open or shorted (fail-safe). High-Z when the receiver is disabled (RE high). |+| 2 | RE | input | Active-low receiver output enable. Receiver output RO is enabled when RE is low and is high-impedance when RE is high. TTL/CMOS input (VIH ≥ 2.0 V, VIL ≤ 0.8 V). |+| 3 | DE | input | Driver output enable. Driver outputs A and B are enabled when DE is high and are high-impedance when DE is low. TTL/CMOS input (VIH ≥ 2.0 V, VIL ≤ 0.8 V). |+| 4 | DI | input | Driver input. A low on DI forces A low and B high; a high on DI forces A high and B low (when DE is high). TTL/CMOS input with ~100 mV typical hysteresis. |+| 5 | GND | power_in | Ground reference (0 V) for the device. |+| 6 | A | bidirectional | Non-inverting RS-485/RS-422 bus pin. Receiver differential input and driver differential output. ±15 kV HBM ESD protected; withstands -7 V to +12 V common-mode; 96 kΩ minimum input resistance (1/8 unit load). |+| 7 | B | bidirectional | Inverting RS-485/RS-422 bus pin. Receiver differential input and driver differential output. ±15 kV HBM ESD protected; withstands -7 V to +12 V common-mode; 96 kΩ minimum input resistance (1/8 unit load). |+| 8 | VDD | power_in | Supply voltage input, +5 V nominal (absolute max -0.3 V to +7 V). Bypass to GND with a 0.1 µF ceramic capacitor close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shanghai Siproin Microelectronics |+| Package | SOP-8 |+| Category | Interface |+| Pins | 8 |++## Ordering variants++- `SSP3485`+- `SSP3485U`++## CAD (KiCad official)++- Symbol: `SSP3485`+- 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:** [Shanghai Siproin Microelectronics datasheet](docs/ssp3485-datasheet.pdf) (11 pp, sha256 `b727d1cfb78b48a8`, 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/ssp3485-datasheet.pdf)

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