# MAX3490ESA

**Analog Devices Inc Maxim Integrated** · RS-485 / RS-422 ICs · SOIC-8

MAX3490ESA from Analog Devices Inc Maxim Integrated, in a SOIC-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, 3.0V ≤ VCC ≤ 3.6V. |
| 2 | RO | output | Receiver output: high if A > B by 200mV, low if A < B by 200mV. |
| 3 | DI | input | Driver input: low forces Y low and Z high, high forces Y high and Z low. |
| 4 | GND | power_in | Ground. |
| 5 | Y | output | Noninverting driver output. |
| 6 | Z | output | Inverting driver output. |
| 7 | B | input | Inverting receiver input. |
| 8 | A | input | Noninverting receiver input. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc Maxim Integrated |
| Package | SOIC-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 |
|---|---|---|---|---|---|---|---|
| Receiver Output Low Voltage | VOL |  |  | 0.4 | V | IOUT = 2.5mA, VID = 200mV, Figure 6 | 2 |
| Receiver Differential Threshold Voltage | VTH | -0.2 |  | 0.2 | V | -7V ≤ VCM ≤ 12V | 2 |
| Receiver Input Resistance | RIN | 12 |  |  | kΩ |  | 2 |
| Differential Driver Output Voltage | VOD | 1.5 |  |  | V | RL = 54Ω (RS-485), Figure 4 | 2 |
| Change in Magnitude of Differential Driver Output Voltage for Complementary Output States | ΔVOD |  |  | 0.2 | V |  | 2 |
| Driver Common-Mode Output Voltage | VOC |  |  | 3 | V | RL = 54Ω or 100Ω, Figure 4 | 2 |
| Change in Magnitude of Common-Mode Output Voltage | ΔVOC |  |  | 0.2 | V |  | 2 |
| Input High Voltage | VIH | 2 |  |  | V |  | 2 |
| Input Low Voltage | VIL |  |  | 0.8 | V |  | 2 |
| Logic Input Current | IIN1 | -2 |  | 2 | µA | DE, DI, RE | 2 |
| Input Current (A, B) | IIN2 | -0.8 |  | 1 | mA | VIN = -7V (min), VIN = 12V (max) | 2 |
| Receiver Three-State (High Impedance) Output Current at Receiver | IOZR | -1 |  | 1 | µA |  | 2 |
| Driver Short-Circuit Output Current | IOSD | -250 |  | 250 | mA | VOUT = -7V (min), VOUT = 12V (max) | 3 |
| Receiver Short-Circuit Output Current | IOSR | -60 |  | 60 | mA | 0V ≤ VRO ≤ VCC | 3 |
| Supply Current | ICC |  | 0.95 | 1.9 | mA | No load, DI = 0V or VCC | 3 |
| Supply Current | ICC |  | 1.1 | 2.2 | mA | No load, DI = 0V or VCC | 3 |
| Driver Propagation Delay, Low-to-High Level | tPLH | 7 | 22 | 35 | ns | RL = 27Ω, Figure 8 | 3 |
| Driver Differential Output Transition Time | tTD | 3 | 8 | 25 | ns | RL = 60Ω, Figure 7 | 3 |
| Driver Differential Output Delay | tDD | 1 | 22 | 35 | ns | RL = 60Ω, Figure 7 | 3 |
| Driver Output Enable Time from Shutdown to High Level | tPSH |  | 650 | 900 | ns | RL = 110Ω, Figure 9 | 3 |
| Driver Output Enable Time from Shutdown to Low Level | tPSL |  | 650 | 900 | ns | RL = 110Ω, Figure 10 | 3 |
| Driver Output Disable Time from High Level | tPHZ |  | 40 | 80 | ns | RL = 110Ω, Figure 9 | 3 |
| Driver Propagation Delay, High-to-Low Level | tPHL | 7 | 22 | 35 | ns | RL = 27Ω, Figure 8 | 3 |
| Driver Propagation Delay Skew | tPDS |  |  | 8 | ns | RL = 27Ω, Figure 8 | 3 |
| Driver Output Enable Time to Low Level | tPZL |  | 45 | 90 | ns | RL = 110Ω, Figure 10 | 3 |
| Driver Output Enable Time to High Level | tPZH |  | 45 | 90 | ns | RL = 110Ω, Figure 9 | 3 |
| Driver Output Disable Time from Low Level | tPLZ |  | 40 | 80 | ns | RL = 110Ω, Figure 10 | 3 |
| Absolute Maximum Supply Voltage | VCC |  |  | 7 | V |  | 2 |
| Control Input Voltage (RE, DE) |  | -0.3 |  | 7 | V |  | 2 |
| Driver Input Voltage (DI) |  | -0.3 |  | 7 | V |  | 2 |
| Driver Output Voltage (A, B, Y, Z) |  | -7.5 |  | 12.5 | V |  | 2 |
| Receiver Input Voltage (A, B) |  | -7.5 |  | 12.5 | V |  | 2 |
| Receiver Output Voltage (RO) |  | -0.3 |  |  | V | Upper limit printed as VCC + 0.3V | 2 |
| Storage Temperature Range |  | -65 |  | 160 | °C |  | 2 |
| Lead Temperature (soldering) |  |  |  | 300 | °C | 10 sec | 2 |
| Supply Voltage | VCC | 3 | 3.3 | 3.6 | V | 3.0V ≤ VCC ≤ 3.6V (pin description); DC tests at VCC = 3.3V ±0.3V | 6 |
| Operating Temperature Range (MAX34__E__) |  | -40 |  | 85 | °C | E-grade suffix | 2 |

## CAD (KiCad official)

- Symbol: `MAX3490ESA`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `max3490esa-etched.step` / `max3490esa-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max3490esa.step` / `max3490esa.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Analog Devices Inc Maxim Integrated datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590254255274684416) (17 pp, sha256 `4b4eb68a9602eafc`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+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/max3490esa-datasheet.pdf)