# ICL3221ECVZ

**RENESAS** · RS232 ICs · TSSOP-16

ICL3221ECVZ from RENESAS, 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 | EN | input | Active low receiver enable control. |
| 2 | C1+ | passive | External capacitor (voltage doubler) is connected to this lead. |
| 3 | V+ | power_out | Internally generated positive transmitter supply (+5.5V). |
| 4 | C1- | passive | External capacitor (voltage doubler) is connected to this lead. |
| 5 | C2+ | passive | External capacitor (voltage inverter) is connected to this lead. |
| 6 | C2- | passive | External capacitor (voltage inverter) is connected to this lead. |
| 7 | V- | power_out | Internally generated negative transmitter supply (-5.5V). |
| 8 | R1IN | input | ±15kV ESD protected, RS-232 compatible receiver input. |
| 9 | R1OUT | output | TTL/CMOS level receiver output. |
| 10 | INVALID | output | Active low output that indicates no valid RS-232 levels are present on any receiver input. |
| 11 | T1IN | input | TTL/CMOS compatible transmitter input. |
| 12 | FORCEON | input | Active high input to override automatic power-down circuitry, which keeps transmitters active (FORCEOFF must be high). |
| 13 | T1OUT | output | ±15kV ESD protected, RS-232 level (nominally ±5.5V) transmitter output. |
| 14 | GND | power_in | Ground connection. |
| 15 | VCC | power_in | System power supply input (3.0V to 5.5V). |
| 16 | FORCEOFF | input | Active low to shut down transmitters and on-chip power supply, which overrides any automatic circuitry and FORCEON. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | RENESAS |
| Package | TSSOP-16 |
| Category | Communication Interface Chip |
| Pins | 16 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | C2- External capacitor (voltage inverter) is connected to this lead TIN TTL/CMOS compatible transmitter inputs | 10 |

## CAD (KiCad official)

- Symbol: `ICL3221ECVZ`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files: `icl3221ecvz-etched.step` / `icl3221ecvz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `icl3221ecvz.step` / `icl3221ecvz.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [RENESAS datasheet](docs/icl3221ecvz-datasheet.pdf) (39 pp, sha256 `d263fc23b7ec8030`, retrieved 2026-10-23, tier: lcsc)
- **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/icl3221ecvz-datasheet.pdf)