# MAX3223EEAP+

**Maxim Integrated** · RS232 ICs · SSOP-20-208mil

MAX3223EEAP+ from Maxim Integrated, in a SSOP-20-208mil. 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 high to force the receiver outputs into a high-impedance state. |
| 2 | C1+ | passive | Positive terminal of the voltage doubler charge-pump capacitor, with 0.1µF required for 3.3V operation. |
| 3 | V+ | power_out | +5.5V supply generated by the charge pump. |
| 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 | -5.5V supply generated by the charge pump. |
| 8 | T2OUT | output | RS-232 transmitter output, guaranteed at least ±5.0V under loaded conditions and forced to high impedance when disabled. |
| 9 | R2IN | input | RS-232 receiver input with an input voltage range of ±25V. |
| 10 | R2OUT | output | TTL/CMOS inverting three-state receiver output. |
| 11 | INVALID | output | Output of the valid signal detector, enabled high when a valid RS-232 level is present on any receiver input. |
| 12 | T2IN | input | TTL/CMOS transmitter input, which has no pull-up resistor. |
| 13 | T1IN | input | TTL/CMOS transmitter input, which has no pull-up resistor. |
| 14 | FORCEON | input | Drive high to override the automatic circuitry and keep transmitters and charge pump on, provided FORCEOFF is high. |
| 15 | R1OUT | output | TTL/CMOS inverting three-state receiver output. |
| 16 | R1IN | input | RS-232 receiver input with an input voltage range of ±25V. |
| 17 | T1OUT | output | RS-232 transmitter output, guaranteed at least ±5.0V under loaded conditions and forced to high impedance when disabled. |
| 18 | GND | power_in | Ground reference for the device. |
| 19 | VCC | power_in | Supply voltage of +3.0V to +5.5V. |
| 20 | FORCEOFF | input | Force-off input, active low: drive low to shut down the transmitters and on-board charge pump, overriding AutoShutdown and FORCEON. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Maxim Integrated |
| Package | SSOP-20-208mil |
| Category | Interface ICs |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `MAX3223EEAP+`
- Footprint: `Package_SO:SSOP-20_5.3x7.2mm_P0.65mm`
- 3D model: SSOP-20-208mil (KiCad packages3D, STEP)
- 3D model files: `max3223eeap-etched.step` / `max3223eeap-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max3223eeap.step` / `max3223eeap.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/max3221e-max3243e.pdf) (19 pp, sha256 `05825bd0ffbc0555`, retrieved 2026-11-02, tier: manufacturer)
- **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/max3223eeap-datasheet.pdf)