MAX3222EEWN+ from Maxim Integrated, in a SOIC-18-300mil. 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; driving EN high places the receiver outputs into a high-impedance state.
2	C1+	passive	Positive terminal of the voltage-doubler charge-pump flying capacitor C1.
3	V+	power_out	Doubled charge-pump output of +5.5V generated from VCC, decoupled by reservoir 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.
6	C2-	passive	Negative terminal of the inverting charge-pump flying capacitor C2.
7	V-	power_out	Inverting charge-pump output of -5.5V generated internally by the charge pump.
8	T2OUT	output	RS-232 transmitter 2 output that may be driven up to ±12V in shutdown and is forced high-impedance when SHDN = GND.
9	R2IN	input	RS-232 receiver 2 input with a absolute voltage limit of ±25V to GND.
10	R2OUT	output	TTL/CMOS receiver 2 output that is inverting, three-state, and high-impedance when EN is high.
11	T2IN	input	TTL/CMOS transmitter 2 input with no pullup resistor; connect unused inputs to GND or VCC.
12	T1IN	input	TTL/CMOS transmitter 1 input with no pullup resistor; connect unused inputs to GND or VCC.
13	R1OUT	output	TTL/CMOS receiver 1 output that is inverting, three-state, and high-impedance when EN is high.
14	R1IN	input	RS-232 receiver 1 input with an absolute voltage limit of ±25V to GND.
15	T1OUT	output	RS-232 transmitter 1 output that may be driven up to ±12V in shutdown and is forced high-impedance when SHDN = GND.
16	GND	power_in	Ground reference for the device.
17	VCC	power_in	Supply voltage, +3.0V to +5.5V.
18	SHDN	input	Shutdown control, active low; SHDN = GND disables the transmitters and forces their outputs high-impedance while the MAX3222E receivers stay active.

Key specifications

Parameter	Value
Manufacturer	Maxim Integrated
Package	SOIC-18-300mil
Category	Interface ICs
Pins	18

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply Current			0.3	1	mA	SHDN = VCC, no load; MAX3222E	2
Shutdown Supply Current			1	10	µA	SHDN = GND	2
Input Logic Low				0.8	V	T_IN, EN, SHDN, MBAUD	2
Input Logic High		2			V	VCC = +3.3V; T_IN, EN, SHDN, MBAUD	2
Input Logic High		2.4			V	VCC = +5.0V; T_IN, EN, SHDN, MBAUD	2
Input Leakage Current		-1	0.01	1	µA	T_IN, EN, SHDN; MAX3222E/MAX3232E/MAX3241E/MAX3246E	2
Output Leakage Current (R_OUT)		-10	0.05	10	µA	EN = VCC, receivers disabled; MAX3222E	3
Output-Voltage Low				0.4	V	IOUT = 1.6mA (MAX3222E/MAX3232E/MAX3241E/MAX3246E)	3
Input Voltage Range		-25		25	V		3
Input Threshold Low		0.6	1.1		V	TA = +25°C, VCC = +3.3V	3
Input Threshold Low		0.8	1.5		V	TA = +25°C, VCC = +5.0V	3
Input Threshold High		1.5	2.4		V	TA = +25°C, VCC = +3.3V	3
Input Threshold High		2	2.4		V	TA = +25°C, VCC = +5.0V	3
Input Resistance		3	5	7	kΩ	TA = +25°C	3
Output Voltage Swing		-5	5.4		V	All transmitter outputs loaded with 3kΩ to ground	3
Output Resistance		300			Ω	VCC = 0V, transmitter output = ±2V	3
Output Resistance				50	kΩ	VCC = 0V, transmitter output = ±2V	3
Output Short-Circuit Current		-60		60	mA		3
Output Leakage Current (transmitter)		-25		25	µA	VCC = 0V or +3.0V to +5.5V, VOUT = ±12V, transmitters disabled (MAX3222E/MAX3232E/MAX3241E/MAX3246E)	3
ESD Human Body Model (R_IN, T_OUT)		-15		15	kV	R_IN, T_OUT	3
ESD IEC 1000-4-2 Air-Gap Discharge (R_IN, T_OUT)		-15		15	kV	R_IN, T_OUT; except MAX3237E	3
ESD IEC 1000-4-2 Contact Discharge (R_IN, T_OUT)		-8		8	kV	R_IN, T_OUT; except MAX3237E	3
Maximum Data Rate		250			kbps	RL = 3kΩ, CL = 1000pF, one transmitter switching, TA = TMIN to TMAX (MAX3222E/MAX3232E/MAX3241E)	4
Receiver Propagation Delay tPHL	tPHL			0.15	µs	Receiver input to receiver output, CL = 150pF	4
Receiver Propagation Delay tPLH	tPLH			0.15	µs	Receiver input to receiver output, CL = 150pF	4
Receiver Output Enable Time				200	ns	Normal operation (except MAX3232E)	4
Receiver Output Disable Time				200	ns	Normal operation (except MAX3232E)	4
Transmitter Skew	/tPHL - tPLH/			100	ns	Note 7	4
Receiver Skew	/tPHL - tPLH/			50	ns		4
Transition-Region Slew Rate		6		30	V/µs	VCC = +3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF, one transmitter switching	4
Supply Voltage VCC to GND	VCC	-0.3		6	V		2
V+ to GND	V+	-0.3		7	V	Note 1	2
V- to GND	V-	-7		0.3	V	Note 1	2
V+ + /V-/				13	V	Note 1	2
Input Voltages T_IN, EN, SHDN, MBAUD to GND		-0.3		6	V		2
Input Voltage R_IN to GND		-25		25	V		2
Output Voltage T_OUT to GND		-13.2		13.2	V		2
Storage Temperature Range		-65		150	°C		2
Lead Temperature (soldering, 10s)				300	°C	soldering, 10s	2
Soldering Temperature (reflow)				260	°C	reflow	2
Supply Voltage VCC	VCC	3		5.5	V	C1-C4 = 0.1µF, TA = TMIN to TMAX	2
Operating Temperature Range (MAX32__EE__)		-40		85	°C	Extended grade (EE), applies to MAX3222EEWN+	2

CAD (KiCad official)

Symbol: MAX3222EEWN+
Footprint: Package_SO:SOIC-18W_7.5x11.6mm_P1.27mm
3D model: SOIC-18-300mil (KiCad packages3D, STEP)
3D model files: max3222eewn-etched.step / max3222eewn-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max3222eewn.step / max3222eewn.glb are the bare package body.

Provenance

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

Datasheet: Maxim Integrated datasheet (22 pp, sha256 773dd6aa67273c10, retrieved 2026-10-30, tier: manufacturer)
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

MAX3222EEWN+

Verified MAX3222EEWN+

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3D Model

Symbol & Footprint

Schematic Symbol

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Datasheet

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