MAX3227ECUE+ from Maxim Integrated, in a TSSOP-16. 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	Active-high ready-to-transmit output that goes high when V- falls below -4V and the device is ready to transmit.
2	C1+	passive	Positive terminal of the voltage-doubler charge-pump capacitor.
3	V+	power_out	+5.5V supply generated by the charge pump.
4	C1-	passive	Negative terminal of the voltage-doubler charge-pump capacitor.
5	C2+	passive	Positive terminal of the inverting charge-pump capacitor.
6	C2-	passive	Negative terminal of the inverting charge-pump capacitor.
7	V-	power_out	-5.5V supply generated by the charge pump.
8	R1IN	input	RS-232 receiver input, protected to ±15kV ESD.
9	R1OUT	output	TTL/CMOS receiver output.
10	INVALID	output	Valid signal detector output, active low; a logic high indicates a valid RS-232 level is present on a receiver input.
11	T1IN	input	TTL/CMOS transmitter input with no pullup resistor; connect unused inputs to GND or VCC.
12	FORCEON	input	Active-high force-on input; drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high).
13	T1OUT	output	RS-232 transmitter output, protected to ±15kV ESD.
14	GND	power_in	Ground.
15	VCC	power_in	+3.0V to +5.5V single supply voltage.
16	FORCEOFF	input	Active-low force-off input; when low, transmitters are high impedance, charge pumps are shut down and receivers are active, overriding AutoShutdown Plus and FORCEON.

Key specifications

Parameter	Value
Manufacturer	Maxim Integrated
Package	TSSOP-16
Category	Interface ICs
Pins	16

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, AutoShutdown Plus			1	10	μA	FORCEON = GND, FORCEOFF = VCC, all R_IN idle, all T_IN idle; VCC = 3.3V or 5.0V, TA = +25°C	6
Supply Current, Shutdown			1	10	μA	FORCEOFF = GND; VCC = 3.3V or 5.0V, TA = +25°C	6
Supply Current, AutoShutdown Plus Disabled			0.3	1	mA	FORCEON = FORCEOFF = VCC, no load; VCC = 3.3V or 5.0V, TA = +25°C	6
Input Logic Threshold Low				0.8	V	T_IN, FORCEON, FORCEOFF	6
Input Logic Threshold High (VCC = 3.3V)		2			V	T_IN, FORCEON, FORCEOFF, VCC = 3.3V	6
Input Logic Threshold High (VCC = 5.0V)		2.4			V	T_IN, FORCEON, FORCEOFF, VCC = 5.0V	6
Transmitter Input Hysteresis			0.5		V		6
Input Leakage Current			0.01	1	μA	T_IN, FORCEON, FORCEOFF; printed ±0.01 typ, ±1 max	6
Output Voltage Low				0.4	V	IOUT = 1.6mA	6
Receiver Input Voltage Range		-25		25	V		6
Receiver Input Threshold Low (VCC = 3.3V)		0.6	1.2		V	TA = +25°C, VCC = 3.3V	6
Receiver Input Threshold Low (VCC = 5.0V)		0.8	1.5		V	TA = +25°C, VCC = 5.0V	6
Receiver Input Threshold High (VCC = 3.3V)			1.5	2.4	V	TA = +25°C, VCC = 3.3V	6
Receiver Input Threshold High (VCC = 5.0V)			1.8	2.4	V	TA = +25°C, VCC = 5.0V	6
Receiver Input Hysteresis			0.5		V		6
Receiver Input Resistance		3	5	7	kΩ	TA = +25°C	6
Transmitter Output Voltage Swing		5	5.4		V	All transmitter outputs loaded with 3kΩ to ground; printed ±5 min, ±5.4 typ	6
Output Short-Circuit Current			60		mA	printed ±60	6
Transmitter Output Leakage Current				25	µA	VCC = 0V or 3V to 5.5V, VOUT = ±12V, Transmitters disabled; printed ±25	6
ESD Protection R_IN, T_OUT, IEC 1000-4-2 Air Discharge			15		kV	printed ±15	7
ESD Protection R_IN, T_OUT, IEC 1000-4-2 Contact Discharge			8		kV	printed ±8	7
ESD Protection R_IN, T_OUT, Human Body Model			15		kV	printed ±15	7
Receiver Positive Threshold to INVALID Output High		2.7			V	Figure 4a, FORCEON = GND, FORCEOFF = VCC	7
Receiver Negative Threshold to INVALID Output High				-2.7	V	Figure 4a, FORCEON = GND, FORCEOFF = VCC	7
Receiver Input Threshold to INVALID Output Low		-0.3		0.3	V	Figure 4a, FORCEON = GND, FORCEOFF = VCC	7
INVALID, READY Output Voltage Low				0.4	V	IOUT = -1.6mA	7
Receiver Threshold to INVALID High	tINVH		1		μs	VCC = 5V, Figure 4b	7
Receiver Threshold to INVALID Low	tINVL		30		μs	VCC = 5V, Figure 4b	7
Receiver or Transmitter Edge to Transmitters Enabled	tWU		100		μs	VCC = 5V, Figure 5b (Note 2)	7
Receiver or Transmitter Edge to Transmitters Shutdown	tAUTOSHDN	15	30	60	s	VCC = 5V, Figure 5b (Note 2)	7
Maximum Data Rate		250			kbps	RL = 3kΩ, CL = 1000pF, one transmitter switching	8
Maximum Data Rate (VCC = 3.0V to 4.5V)		1000			kbps	VCC = 3.0V to 4.5V, RL = 3kΩ, CL = 250pF, one transmitter switching	8
Maximum Data Rate (VCC = 4.5V to 5.5V)		1000			kbps	VCC = 4.5V to 5.5V, RL = 3kΩ, CL = 1000pF, one transmitter switching	8
Receiver Propagation Delay tPHL	tPHL		0.15		μs	R_IN to R_OUT, CL = 150pF	8
Receiver Propagation Delay tPLH	tPLH		0.15		μs	R_IN to R_OUT, CL = 150pF	8
Transmitter Skew			25		ns	│tPHL - tPLH│ (Note 3)	8
Receiver Skew			50		ns	│tPHL - tPLH│	8
Transition-Region Slew Rate		24		150	V/μs	VCC = 3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF, measured from +3V to -3V or -3V to +3V, one transmitter switching	8
Supply Voltage Range	VCC	3		5.5	V	Electrical characteristics header VCC = +3V to +5.5V	6
Operating Temperature Range (MAX32__EC__)	TA	0		70	°C		2
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
T_IN, FORCEON, FORCEOFF to GND		-0.3		6	V	Input voltages	2
R_IN to GND		-25		25	V		2
T_OUT to GND		-13.2		13.2	V	Short-circuit duration continuous	2
R_OUT, INVALID, READY to GND		-0.3			V	Max is (VCC + 0.3V)	2
Storage Temperature Range		-65		160	°C		2
Lead Temperature (soldering, 10s)				300	°C		2
Soldering Temperature (reflow)				260	°C		2
Thermal Resistance Junction to Ambient, 16-TSSOP	θJA		106		°C/W	Single layer board, package U16+1	2
Thermal Resistance Junction to Case, 16-TSSOP	θJC		27		°C/W	Single layer board, package U16+1	2
Thermal Resistance Junction to Ambient, 16-TSSOP	θJA		90		°C/W	Four-layer board, package U16+1	2

CAD (KiCad official)

Symbol: MAX3227ECUE+
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)
3D model files: max3227ecue-etched.step / max3227ecue-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max3227ecue.step / max3227ecue.glb are the bare package body.

Provenance

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

Datasheet: Maxim Integrated datasheet (25 pp, sha256 8542587c6f3a36a5, retrieved 2026-10-31, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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

MAX3227ECUE+

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