# MAX221ECAE+T

**Analog Devices Inc Maxim Integrated** · RS232 ICs · SSOP-16-208mil

MAX221ECAE+T from Analog Devices Inc Maxim Integrated, in a SSOP-16-208mil. 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 | EN | input | Receiver Enable Control: drive low for normal operation, and drive high to force the receiver output (ROUT) into a high-impedance state. |
| 2 | C1+ | passive | Positive terminal of the voltage doubler charge-pump capacitor. |
| 3 | V+ | power_out | Positive voltage generated by the charge pump; in shutdown V+ is pulled to VCC. |
| 4 | C1- | passive | Negative terminal of the voltage doubler charge-pump capacitor. |
| 5 | C2+ | passive | Positive terminal of the inverting charge-pump capacitor. |
| 6 | C2- | passive | Negative terminal of the inverting charge-pump capacitor. |
| 7 | V- | power_out | Negative voltage generated by the charge pump; in shutdown V- is pulled to ground. |
| 8 | RIN | input | RS-232 receiver input; the AutoShutdown logic uses this input to detect valid levels (±2.7V trip, ±0.3V threshold region). |
| 9 | ROUT | output | TTL/CMOS receiver output (inverting, three-state). |
| 10 | INVALID | output | Output of the invalid signal detector; INVALID is pulled low if no valid RS-232 level is present on the receiver input. |
| 11 | TIN | input | TTL/CMOS transmitter input; the transmitter input has no pull-up resistor. |
| 12 | FORCEON | input | Drive high to override the automatic circuitry and keep the transmitter and charge pump on; FORCEOFF must be high (Table 1). |
| 13 | TOUT | output | RS-232 transmitter output; short-circuit duration is continuous and the output goes high-impedance when disabled. |
| 14 | GND | power_in | Ground. |
| 15 | VCC | power_in | Supply voltage, +4.5V to +5.5V. |
| 16 | FORCEOFF | input | Force-off input, active low: drive low to shut down the transmitter, receiver and on-board charge pump, overriding all automatic circuitry and FORCEON. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc Maxim Integrated |
| Package | SSOP-16-208mil |
| Category | Communication Interface Chip/UART/485/232 |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `MAX221ECAE+T`
- Footprint: `Package_SO:SSOP-16_5.3x6.2mm_P0.65mm`
- 3D model: SSOP-16-208mil (KiCad packages3D, STEP)
- 3D model files: `max221ecae-t-etched.step` / `max221ecae-t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max221ecae-t.step` / `max221ecae-t.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/8588923732534702080) (8 pp, sha256 `a03e770a885f02d4`, retrieved 2026-10-21, 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/max221ecae-t-datasheet.pdf)