# SN65C3221IPWRQ1

**Texas Instruments** · Pre-ordered Chips · TSSOP-16

SN65C3221IPWRQ1 from Texas Instruments, 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 | Receiver enable control input (VIH 2 V min at 3.3 V, 2.4 V min at 5 V; VIL 0.8 V max); low enables ROUT, high puts ROUT in high impedance. |
| 2 | C1+ | passive | Positive terminal of charge-pump capacitor C1 (0.1 µF for VCC = 3.3 V ± 0.3 V, 0.047 µF for 5 V ± 0.5 V). |
| 3 | V+ | power_out | Positive charge-pump output supply for RS-232 drivers, with capacitor C3 to VCC or GND; absolute maximum 7 V. |
| 4 | C1− | passive | Negative terminal of charge-pump capacitor C1 (0.1 µF for VCC = 3.3 V ± 0.3 V, 0.047 µF for 5 V ± 0.5 V). |
| 5 | C2+ | passive | Positive terminal of charge-pump capacitor C2 (0.1 µF at 3.3 V, 0.33 µF at 5 V). |
| 6 | C2− | passive | Negative terminal of charge-pump capacitor C2 (0.1 µF at 3.3 V, 0.33 µF at 5 V). |
| 7 | V− | power_out | Negative charge-pump output supply for RS-232 drivers, with capacitor C4 to GND; absolute maximum −7 V. |
| 8 | RIN | input | RS-232 receiver input with 5 kΩ nominal input resistance, ±25 V input range and ±15 kV HBM ESD protection. |
| 9 | ROUT | output | Logic-level receiver output, high impedance when EN is high; VOH of VCC−0.6 V min at −1 mA. |
| 10 | INVALID | output | Valid-signal output, high when receiver input is above 2.7 V or below −2.7 V (or within ±0.3 V for less than 30 µs) and low when between −0.3 V and 0.3 V for more than 30 µs. |
| 11 | DIN | input | Logic-level driver input (VIH 2 V min at 3.3 V, 2.4 V min at 5 V; VIL 0.8 V max), accepts 5.5 V maximum. |
| 12 | FORCEON | input | Logic input that with FORCEOFF high disables auto-powerdown when high; auto-powerdown functions when FORCEON is low. |
| 13 | DOUT | output | RS-232 driver output with ±15 kV HBM ESD protection, ±5 V minimum swing into 3 kΩ and high impedance when powered off. |
| 14 | GND | power_in | Ground reference for all voltages. |
| 15 | VCC | power_in | Supply voltage input, 3 V to 5.5 V operation with 0.1 µF bypass capacitor. |
| 16 | FORCEOFF | input | Logic input that shuts off driver and charge pump when low (supply current reduced to 1 µA with EN high); high enables operation with auto-powerdown. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-16 |
| Category | Interface ICs |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `SN65C3221IPWRQ1`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files: `sn65c3221ipwrq1-etched.step` / `sn65c3221ipwrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn65c3221ipwrq1.step` / `sn65c3221ipwrq1.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn65c3221-q1.pdf) (18 pp, sha256 `58557f6d20cfa0e3`, 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/sn65c3221ipwrq1-datasheet.pdf)