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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.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 (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