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COSMAX3222

Public Made by Adom

by adom

COSINE RS232 ICs, TSSOP-20. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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COSMAX3222

COSINE · RS232 ICs · TSSOP-20

COSMAX3222 from COSINE, in a TSSOP-20. 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 Enable (active-LOW, EN\overline). Drive LOW for normal receiver operation; drive HIGH to place receiver outputs in high-impedance (tri-state).
2 C1+ passive Positive terminal of the voltage-doubler charge-pump flying capacitor (C1, typ. 0.1 uF).
3 V+ power_out +5.5 V output generated by the internal charge pump. Bypass to GND with a 0.1 uF capacitor (C3).
4 C1- passive Negative terminal of the voltage-doubler charge-pump flying capacitor (C1).
5 C2+ passive Positive terminal of the inverting charge-pump flying capacitor (C2, typ. 0.1 uF).
6 C2- passive Negative terminal of the inverting charge-pump flying capacitor (C2).
7 V- power_out -5.5 V output generated by the internal inverting charge pump. Bypass to GND with a 0.1 uF capacitor (C4).
8 T2OUT output RS-232 driver #2 output. Inverted RS-232-level (nominally +/-5 V) transmit line for connection to the serial port.
9 R2IN input RS-232 receiver #2 input. Accepts +/-15 V RS-232 signaling from the serial port; internal 5 kOhm pulldown commits output HIGH when input is open.
10 R2OUT tri_state TTL/CMOS receiver #2 output. Inverted logic-level output of receiver 2; tri-stated when EN\overline is HIGH.
11 NC unconnected No internal connection. Leave floating or tie to GND.
12 T2IN input TTL/CMOS driver #2 input. Must be a valid HIGH or LOW; no internal pullup, so unused inputs should be tied to VCC or GND.
13 T1IN input TTL/CMOS driver #1 input. Must be a valid HIGH or LOW; no internal pullup, so unused inputs should be tied to VCC or GND.
14 NC unconnected No internal connection. Leave floating or tie to GND.
15 R1OUT tri_state TTL/CMOS receiver #1 output. Inverted logic-level output of receiver 1; tri-stated when EN\overline is HIGH.
16 R1IN input RS-232 receiver #1 input. Accepts +/-15 V RS-232 signaling from the serial port; internal 5 kOhm pulldown commits output HIGH when input is open.
17 T1OUT output RS-232 driver #1 output. Inverted RS-232-level (nominally +/-5 V) transmit line for connection to the serial port.
18 GND power_in Device ground / 0 V reference.
19 VCC power_in Positive supply, 3.0 V to 5.5 V. Bypass to GND with a 0.1 uF capacitor.
20 SHDN input Shutdown control input (active-LOW, SHDN\overline). Drive HIGH for normal device operation. Drive LOW to shut down the drivers (high-Z outputs) and disable the on-chip charge pumps; supply current falls below 1 uA.

Key specifications

Parameter Value
Manufacturer COSINE
Package TSSOP-20
Category Interface
Pins 20

Ordering variants

Same part, different packaging or reel option.

  • COSMAX3222SR
  • COSMAX3222

CAD (KiCad official)

  • Symbol: COSMAX3222
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: cosmax3222-etched.step / cosmax3222-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cosmax3222.step / cosmax3222.glb are the bare package body.

Provenance

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

  • Datasheet: COSINE datasheet (11 pp, sha256 fb0a0d94b62f6d61, retrieved 2026-08-17, tier: lcsc)
  • 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