# DS4520E+TRL

**Maxim Integrated** · I/O Expanders · TSSOP-16

DS4520E+TRL from Maxim Integrated, in a TSSOP-16. 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 | I/O_0 | bidirectional | Input/Output 0, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 2 | I/O_1 | bidirectional | Input/Output 1, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 3 | I/O_2 | bidirectional | Input/Output 2, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 4 | I/O_3 | bidirectional | Input/Output 3, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 5 | I/O_4 | bidirectional | Input/Output 4, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 6 | A0 | input | I2C address input; A0, A1, and A2 determine the I2C slave address, with GND giving 0 and VCC giving 1. |
| 7 | A1 | input | I2C address input; A0, A1, and A2 determine the I2C slave address, with GND giving 0 and VCC giving 1. |
| 8 | VCC | power_in | Power-supply voltage, 2.7V to 5.5V, decoupled with a 0.1µF ceramic capacitor close to the pin. |
| 9 | SDA | bidirectional | I2C serial data open-drain input/output, rated -0.5V to +6.0V relative to ground. |
| 10 | SCL | input | I2C serial clock input, up to 400kHz, rated -0.5V to +6.0V relative to ground. |
| 11 | A2 | input | I2C address input; A0, A1, and A2 determine the I2C slave address, with GND giving 0 and VCC giving 1. |
| 12 | I/O_5 | bidirectional | Input/Output 5, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 13 | I/O_6 | bidirectional | Input/Output 6, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 14 | I/O_7 | bidirectional | Input/Output 7, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 15 | I/O_8 | bidirectional | Input/Output 8, bidirectional NV I/O pin with open-drain output (sinks up to 12mA) and selectable internal pullup. |
| 16 | GND | power_in | Ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Maxim Integrated |
| Package | TSSOP-16 |
| Category | Interface ICs |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `DS4520E+TRL`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files: `ds4520e-trl-etched.step` / `ds4520e-trl-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ds4520e-trl.step` / `ds4520e-trl.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Maxim Integrated datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/ds4520.pdf) (11 pp, sha256 `7a03872d5183fb98`, retrieved 2026-10-31, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/ds4520e-trl-datasheet.pdf)