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Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

MAX3222IDWR

Texas Instruments · RS232 ICs · SOIC-20-300mil

MAX3222IDWR from Texas Instruments, in a SOIC-20-300mil. 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, active low: EN low turns on both ROUT outputs and EN high puts both ROUT pins into the high-impedance state.
2	C1+	passive	Charge-pump capacitor pin (C1 positive terminal) for the external charge-pump capacitor.
3	V+	power_out	Charge-pump positive output supply; the absolute maximum rating for V+ is −0.3 V to 7 V.
4	C1-	passive	Charge-pump capacitor pin (C1 negative terminal) for the external charge-pump capacitor.
5	C2+	passive	Charge-pump capacitor pin (C2 positive terminal) for the external charge-pump capacitor.
6	C2-	passive	Charge-pump capacitor pin (C2 negative terminal) for the external charge-pump capacitor.
7	V-	power_out	Charge-pump negative output supply; the absolute maximum rating is listed in the datasheet table as 0.3 to -7 V.
8	DOUT2	output	RS-232 driver output 2; driver output voltage is limited to ±13.2 V.
9	RIN2	input	RS-232 receiver 2 input; receiver input voltage range is −25 V to 25 V.
10	ROUT2	output	Receiver 2 logic output; it goes high-impedance when EN is high.
11	NC	unconnected	No internal connection.
12	DIN2	input	Driver 2 logic input, which must be held at a valid low (≤0.8 V) or high level (≥2 V at VCC = 3.3 V, ≥2.4 V at VCC = 5 V).
13	DIN1	input	Driver 1 logic input, which must be held at a valid low (≤0.8 V) or high level (≥2 V at VCC = 3.3 V, ≥2.4 V at VCC = 5 V).
14	NC	unconnected	No internal connection.
15	ROUT1	output	Receiver 1 logic output; it goes high-impedance when EN is high.
16	RIN1	input	RS-232 receiver 1 input; receiver input voltage range is −25 V to 25 V.
17	DOUT1	output	RS-232 driver output 1; driver output voltage is limited to ±13.2 V.
18	GND	power_in	Ground reference; all voltages in the datasheet are referenced to network GND.
19	VCC	power_in	Supply voltage: 3 V to 3.6 V (3.3 V nominal) or 4.5 V to 5.5 V (5 V nominal); the device operates from 3 V to 5.5 V.
20	PWRDOWN	input	Driver disable, active low: PWRDOWN low turns the drivers off (high-impedance) and reduces supply current to 1 µA typical.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-20-300mil
Category	Interface
Pins	20

CAD (KiCad official)

Symbol: MAX3222IDWR
Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
3D model: SOIC-20-300mil (KiCad packages3D, STEP)
3D model files: max3222idwr-etched.step / max3222idwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max3222idwr.step / max3222idwr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (29 pp, sha256 7d758e2084f5e5d4, retrieved 2026-10-11, 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