# MAX487-TD

**TDSEMIC** · RS-485 / RS-422 ICs · DIP-8

MAX487-TD from TDSEMIC, in a DIP-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 | RO | output | Receiver output: RO is high when A is more than 200mV above B, and low when A is more than 200mV below B. |
| 2 | RE | input | Receiver enable, active low; when RE is high the receiver output is high impedance. |
| 3 | DE | input | Driver enable, active high; when DE is low the driver outputs are high impedance, and when DE is high the chip is in transmit mode (receive mode when DE and RE are both low). |
| 4 | DI | input | Driver data input: when DI is low A is high and B is low, and when DI is high the outputs are the opposite. |
| 5 | GND | power_in | Ground, negative supply terminal. |
| 6 | A | bidirectional | Non-inverting receiver input and non-inverting driver output. |
| 7 | B | bidirectional | Inverting receiver input and inverting driver output. |
| 8 | VCC | power_in | Positive power supply terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TDSEMIC |
| Package | DIP-8 |
| Category | Interface |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `MAX487-TD`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `max487-td-etched.step` / `max487-td-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max487-td.step` / `max487-td.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TDSEMIC datasheet](docs/max487-td-datasheet.pdf) (11 pp, sha256 `21d1f2cac87a9686`, retrieved 2026-10-19, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (vision), consensus `claude-opus-5-5` (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).

[Datasheet PDF](docs/max487-td-datasheet.pdf)