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TRS3318EIPWR
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Texas Instruments RS232 ICs, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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TRS3318EIPWR
Texas Instruments · RS232 ICs · TSSOP-20
TRS3318EIPWR from Texas Instruments, in a TSSOP-20. 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 | READY | output | Ready-to-transmit output, active high; it is enabled high when V− goes below −3.5 V and the device is ready to transmit. |
| 2 | C1+ | passive | Positive terminal of the voltage-doubler charge-pump capacitor; the datasheet specifies four 0.1-µF charge-pump capacitors. |
| 3 | V+ | power_out | Charge-pump output at 2 × VCC generated internally; it requires an external 0.1-µF reservoir capacitor per the typical application circuit. |
| 4 | C1− | passive | Negative terminal of the voltage-doubler charge-pump capacitor; the datasheet specifies four 0.1-µF charge-pump capacitors. |
| 5 | C2+ | passive | Positive terminal of the inverting charge-pump capacitor; the datasheet specifies four 0.1-µF charge-pump capacitors. |
| 6 | C2− | passive | Negative terminal of the inverting charge-pump capacitor; the datasheet specifies four 0.1-µF charge-pump capacitors. |
| 7 | V− | power_out | Charge-pump output at −2 × VCC generated internally; absolute maximum V− to GND is −7 V to 0.3 V. |
| 8 | DOUT2 | output | RS-232 driver output 2; absolute maximum DOUT to GND is ±13.2 V and the output is continuously short-circuit protected to GND. |
| 9 | RIN2 | input | RS-232 receiver input 2; the recommended receiver input voltage range is −25 V to 25 V. |
| 10 | ROUT2 | output | CMOS receiver output 2, referenced to VCC (absolute maximum −0.3 V to VCC + 0.3 V). |
| 11 | INVALID | output | Valid-signal detector output, active low; a logic high indicates a valid RS-232 level is present on a receiver input, and it is driven low when all receiver inputs stay between −0.3 V and 0.3 V for more than 30 µs. |
| 12 | DIN2 | input | CMOS driver input 2; with VCC = 2.5 V to 3 V it requires VIH of at least 0.7 × VCC and VIL of at most 0.3 × VCC, with a maximum input of 5.5 V. |
| 13 | DIN1 | input | CMOS driver input 1; with VCC = 2.5 V to 3 V it requires VIH of at least 0.7 × VCC and VIL of at most 0.3 × VCC, with a maximum input of 5.5 V. |
| 14 | FORCEON | input | Force-on input, active high; driving it high overrides auto-powerdown and keeps the transmitters on, provided FORCEOFF is high, with absolute maximum input −0.3 V to 6 V. |
| 15 | ROUT1 | output | CMOS receiver output 1, referenced to VCC (absolute maximum −0.3 V to VCC + 0.3 V). |
| 16 | RIN1 | input | RS-232 receiver input 1; the recommended receiver input voltage range is −25 V to 25 V. |
| 17 | DOUT1 | output | RS-232 driver output 1; absolute maximum DOUT to GND is ±13.2 V and the output is continuously short-circuit protected to GND. |
| 18 | GND | power_in | Ground reference for the device; VCC to GND absolute maximum is −0.3 V to 6 V. |
| 19 | VCC | power_in | Single-supply input of 2.25 V to 3 V; VCC to GND absolute maximum is −0.3 V to 6 V. |
| 20 | FORCEOFF | input | Force-off input, active low; driving it low powers down the transmitters and charge pump and overrides auto-powerdown and FORCEON, with absolute maximum input −0.3 V to 6 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Interface |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
TRS3318EIPWR - Footprint:
Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm - 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files:
trs3318eipwr-etched.step/trs3318eipwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);trs3318eipwr.step/trs3318eipwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (23 pp, sha256
3758ceb856a8087f, retrieved 2026-10-08, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# TRS3318EIPWR
**Texas Instruments** · RS232 ICs · TSSOP-20
TRS3318EIPWR from Texas Instruments, in a TSSOP-20. 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 | READY | output | Ready-to-transmit output, active high; it is enabled high when V− goes below −3.5 V and the device is ready to transmit. |
| 2 | C1+ | passive | Positive terminal of the voltage-doubler charge-pump capacitor; the datasheet specifies four 0.1-µF charge-pump capacitors. |
| 3 | V+ | power_out | Charge-pump output at 2 × VCC generated internally; it requires an external 0.1-µF reservoir capacitor per the typical application circuit. |
| 4 | C1− | passive | Negative terminal of the voltage-doubler charge-pump capacitor; the datasheet specifies four 0.1-µF charge-pump capacitors. |
| 5 | C2+ | passive | Positive terminal of the inverting charge-pump capacitor; the datasheet specifies four 0.1-µF charge-pump capacitors. |
| 6 | C2− | passive | Negative terminal of the inverting charge-pump capacitor; the datasheet specifies four 0.1-µF charge-pump capacitors. |
| 7 | V− | power_out | Charge-pump output at −2 × VCC generated internally; absolute maximum V− to GND is −7 V to 0.3 V. |
| 8 | DOUT2 | output | RS-232 driver output 2; absolute maximum DOUT to GND is ±13.2 V and the output is continuously short-circuit protected to GND. |
| 9 | RIN2 | input | RS-232 receiver input 2; the recommended receiver input voltage range is −25 V to 25 V. |
| 10 | ROUT2 | output | CMOS receiver output 2, referenced to VCC (absolute maximum −0.3 V to VCC + 0.3 V). |
| 11 | INVALID | output | Valid-signal detector output, active low; a logic high indicates a valid RS-232 level is present on a receiver input, and it is driven low when all receiver inputs stay between −0.3 V and 0.3 V for more than 30 µs. |
| 12 | DIN2 | input | CMOS driver input 2; with VCC = 2.5 V to 3 V it requires VIH of at least 0.7 × VCC and VIL of at most 0.3 × VCC, with a maximum input of 5.5 V. |
| 13 | DIN1 | input | CMOS driver input 1; with VCC = 2.5 V to 3 V it requires VIH of at least 0.7 × VCC and VIL of at most 0.3 × VCC, with a maximum input of 5.5 V. |
| 14 | FORCEON | input | Force-on input, active high; driving it high overrides auto-powerdown and keeps the transmitters on, provided FORCEOFF is high, with absolute maximum input −0.3 V to 6 V. |
| 15 | ROUT1 | output | CMOS receiver output 1, referenced to VCC (absolute maximum −0.3 V to VCC + 0.3 V). |
| 16 | RIN1 | input | RS-232 receiver input 1; the recommended receiver input voltage range is −25 V to 25 V. |
| 17 | DOUT1 | output | RS-232 driver output 1; absolute maximum DOUT to GND is ±13.2 V and the output is continuously short-circuit protected to GND. |
| 18 | GND | power_in | Ground reference for the device; VCC to GND absolute maximum is −0.3 V to 6 V. |
| 19 | VCC | power_in | Single-supply input of 2.25 V to 3 V; VCC to GND absolute maximum is −0.3 V to 6 V. |
| 20 | FORCEOFF | input | Force-off input, active low; driving it low powers down the transmitters and charge pump and overrides auto-powerdown and FORCEON, with absolute maximum input −0.3 V to 6 V. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-20 |
| Category | Interface |
| Pins | 20 |
## CAD (KiCad official)
- Symbol: `TRS3318EIPWR`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `trs3318eipwr-etched.step` / `trs3318eipwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `trs3318eipwr.step` / `trs3318eipwr.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/cn/lit/gpn/trs3318e) (23 pp, sha256 `3758ceb856a8087f`, retrieved 2026-10-08, 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/trs3318eipwr-datasheet.pdf)