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MAX3221CPWR

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by Ray

Texas Instruments RS232 ICs, TSSOP-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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PCB Footprint

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Datasheet

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Contents

README

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MAX3221CPWR

Texas Instruments · RS232 ICs · TSSOP-16

MAX3221CPWR from Texas Instruments, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 EN input Receiver output enable (active low). Low input enables the ROUT output; high input places ROUT in high impedance.
2 C1+ passive Positive terminal of the voltage-doubler charge-pump capacitor C1 (typ. 0.1 µF at VCC = 3.3 V, 0.047 µF at VCC = 5 V).
3 V+ power_out Positive charge-pump output, nominally +5.5 V generated internally. Bypass to GND with a reservoir capacitor (typ. 0.1 µF at 3.3 V / 0.33 µF at 5 V).
4 C1- passive Negative terminal of the voltage-doubler charge-pump capacitor C1.
5 C2+ passive Positive terminal of the inverting charge-pump capacitor C2 (typ. 0.1 µF at 3.3 V / 0.33 µF at 5 V).
6 C2- passive Negative terminal of the inverting charge-pump capacitor C2.
7 V- power_out Negative charge-pump output, nominally -5.5 V generated internally. Bypass to GND with a reservoir capacitor (typ. 0.1 µF at 3.3 V / 0.33 µF at 5 V).
8 RIN input RS-232 receiver input. Accepts ±25 V RS-232 line levels; protected to ±15 kV HBM ESD.
9 ROUT output Receiver output (CMOS/TTL levels referenced to VCC). Goes to high impedance when EN is high.
10 INVALID output Invalid receiver-input status output (active low). Output is low when all RIN inputs are unpowered / not driven by a valid RS-232 signal.
11 DIN input Driver (transmitter) logic input. CMOS/TTL-compatible; VIH ≥ 2 V (VCC = 3.3 V) or 2.4 V (VCC = 5 V), VIL ≤ 0.8 V.
12 FORCEON input Automatic power-down control input. When FORCEON is low and FORCEOFF is high, auto power-down is active; drive high to force the driver always on.
13 DOUT output RS-232 driver output. Swings between V+ and V- (typ. ±5.4 V into a 3-kΩ load); ±15-kV HBM ESD protected.
14 GND power_in Device ground reference.
15 VCC power_in Supply voltage, 3.0 V to 5.5 V (recommended 3.3 V or 5 V nominal). Bypass with 0.1 µF to GND.
16 FORCEOFF input Automatic power-down control input (active low). Drive low to force the drivers and charge pump off; high to allow normal / auto-power-down operation.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • MAX3221CPWR
  • MAX3221CPWRDB
  • MAX3221CPWRDBR

CAD (KiCad official)

  • Symbol: MAX3221CPWR
  • Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
  • 3D model: TSSOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
max3221cpwr.step 205 KB You want the bare part, or you mark your own boards.
max3221cpwr-etched.step 2.5 MB You want the part with MAX3221CPWR already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 635 faces against 255 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: Texas Instruments datasheet (25 pp, sha256 b386254cd61c7a40, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF