# MAX490ESA

**XBLW** · RS-485 / RS-422 ICs · SOP-8

MAX490ESA from XBLW, in a SOP-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 | Positive supply pin; the datasheet specifies 3.0 V ≦ VCC ≦ 5.5 V (absolute maximum 7 V). |
| 2 | RO | output | Receiver output: goes high when A-B ≥ -50 mV and low when A-B ≤ -200 mV, and is held high when the receiver input is open or shorted. |
| 3 | DI | input | Driver input: a low level forces Y low and Z high, and a high level forces Y high and Z low; absolute range is -0.3 V to VCC+0.3 V. |
| 4 | GND | power_in | Ground reference pin for the device. |
| 5 | Y | output | Driver non-inverting output that follows DI; the driver output voltage range is limited to -8 V to +13 V per the absolute maximum ratings. |
| 6 | Z | output | Driver inverting output, complementary to Y; the driver output voltage range is limited to -8 V to +13 V per the absolute maximum ratings. |
| 7 | B | input | Receiver inverting input; the receiver input voltage range is -8 V to +13 V with a nominal input impedance of 96 kΩ. |
| 8 | A | input | Receiver non-inverting input; the receiver input voltage range is -8 V to +13 V with a nominal input impedance of 96 kΩ. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | XBLW |
| Package | SOP-8 |
| Category | Interface |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 3 |  | 5.5 | V |  | 4 |
| Differential driver output (no load) | VOD1 | 1.5 |  | 5 | V | Figure 4 | 4 |
| Differential driver output (RS-422) | VOD2 | 2 |  | 5 | V | Figure 4, R=50Ω (RS-422) | 4 |
| Differential driver output (RS-485) | VOD2 | 1.5 |  | 5 | V | Figure 4, R=27Ω (RS-485) | 4 |
| Amplitude change in differential output voltage | ∆VOD |  |  | 0.2 | V | Figure 4, R=50Ω or R=27Ω | 4 |
| Drive common mode output voltage | VOC | 1 |  | 3 | V | Figure 4, R=50Ω or R=27Ω | 4 |
| Amplitude change in common mode voltage | ∆VOC |  |  | 0.2 | V | Figure 4, R=50Ω or R=27Ω | 4 |
| Input high voltage DE, DI, /RE | VIH1 | 2 |  |  | V |  | 4 |
| Input low voltage DE, DI, /RE | VIL1 |  |  | 0.8 | V |  | 4 |
| DI input lag | VHYS |  | 100 |  | mV |  | 4 |
| Input current (A,B) full duplex | IIN4 |  |  | 125 | µA | DE=GND, VCC=GND or VIN=12V | 4 |
| Receiver differential threshold voltage | VTH | -200 | -110 | -50 | mV | -7V≦VCM≦12V | 4 |
| Receiver input lag | ΔVTH |  | 30 |  | mV |  | 4 |
| Receiver output low voltage | VOL |  |  | 0.4 | V | IO=4mA, VID=-200mV | 4 |
| Three state output current at receiver end | IOZR | -1 |  | 1 | µA | 0.4V≦VO≦2.4V | 4 |
| Receiver input impedance | RIN |  | 96 |  | KΩ | -7V≦VCM≦12V | 4 |
| Supply current (static working current) | ICC |  | 270 | 600 | µA | No load, DI=0 or VCC | 4 |
| ESD electrostatic protection (HBM) | ESD HBM | 3000 |  |  | V |  | 4 |
| Drive input to output (high) | TDPLH | 250 | 720 | 900 | ns | Figures 5 and 6, RDIFF=54Ω, CL1=CL2=100p | 5 |
| Drive input to output (low) | TDPHL | 250 | 720 | 900 | ns | Figures 5 and 6, RDIFF=54Ω, CL1=CL2=100p | 5 |
| Drive output skew /tDPLH - tDPHL/ | TDHKEW | -100 | -3 | 100 | ns | Figures 5 and 6, RDIFF=54Ω, CL1=CL2=100p | 5 |
| Drive up or down time | tDR, tDF | 200 | 530 | 750 | ns | Figures 5 and 6, RDIFF=54Ω, CL1=CL2=100p | 5 |
| Maximum data rate | FMAX |  |  | 2.5 | M |  | 5 |
| Receiver input to output (low to high) | TRPLH |  | 127 | 200 | ns | Figures 7 and 8, /VID/ ≥ 2.0V, rise and fall times ≤ 15 ns | 5 |
| Receiver input to output (high to low) | TRPHL |  | 127 | 200 | ns | Figures 7 and 8, /VID/ ≥ 2.0V, rise and fall times ≤ 15 ns | 5 |
| Differential receiver skew /tDPLH - tDPHL/ | TRSKD | -30 | 3 | 30 | ns | Figures 7 and 8, /VID/ ≥ 2.0V, rise and fall times ≤ 15 ns | 5 |
| Supply voltage (absolute maximum) | VCC |  |  | 7 | V |  | 3 |
| Drive input voltage | DI | -0.3 |  |  | V |  | 3 |
| Receiver output voltage | RO | -0.3 |  |  | V |  | 3 |
| Continuous power consumption |  |  |  | 471 | mW | SOP-8 package | 3 |
| Storage temperature |  | -65 |  | 150 | ℃ |  | 3 |
| Soldering temperature |  |  |  | 245 | ℃ | 10 s | 3 |

## CAD (KiCad official)

- Symbol: `MAX490ESA`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `max490esa-etched.step` / `max490esa-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max490esa.step` / `max490esa.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [XBLW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603380675009658880) (10 pp, sha256 `a5821d8ad0c2488e`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/max490esa-datasheet.pdf)