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Contents

Pinout
Key specifications
Electrical characteristics
CAD (KiCad official)
Provenance

README

markdown

MAX13223EEUP+T

Analog Devices Inc Maxim Integrated · RS232 ICs · TSSOP-20

MAX13223EEUP+T from Analog Devices Inc Maxim Integrated, in a TSSOP-20. 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 control input: drive low for normal operation, drive high to force R1OUT and R2OUT into a high-impedance state.
2	C1+	passive	Positive terminal of the voltage-doubler charge-pump capacitor C1.
3	V+	power_out	+5.5V supply generated by the doubling charge pump, which requires reservoir capacitor C3 (or C4 per the datasheet's capacitor table).
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.
6	C2-	passive	Negative terminal of the inverting charge-pump capacitor C2.
7	V-	power_out	-5.5V supply generated by the inverting charge pump, regulated regardless of VCC over the +3.0V to +5.5V range.
8	T2OUT	output	RS-232 transmitter 2 output, fault-protected to ±70V and forced to high-impedance when disabled.
9	R2IN	input	RS-232 receiver 2 input, fault-protected to the ±70V range.
10	R2OUT	output	Receiver 2 logic output, asserted low in shutdown when EN is low and high-impedance when EN is high.
11	INVALID	output	Valid-signal detector output that is high when a valid RS-232 level is present on any receiver input.
12	T2IN	input	Transmitter 2 TTL/CMOS logic input.
13	T1IN	input	Transmitter 1 TTL/CMOS logic input.
14	FORCEON	input	Active-high input that overrides AutoShutdown, keeping transmitters and charge pump on (FORCEOFF must be high).
15	R1OUT	output	Receiver 1 logic output, asserted low in shutdown when EN is low and high-impedance when EN is high.
16	R1IN	input	RS-232 receiver 1 input, fault-protected to the ±70V range.
17	T1OUT	output	RS-232 transmitter 1 output, fault-protected to ±70V and forced to high-impedance when disabled.
18	GND	power_in	Ground reference for the device; all voltages are referenced to GND.
19	VCC	power_in	+3.0V to +5.5V supply voltage; bypass with a 0.1µF ceramic capacitor located as close to the device as possible.
20	FORCEOFF	input	Active-low input that shuts down transmitters, receivers, and on-board charge pumps, overriding AutoShutdown and FORCEON.

Key specifications

Parameter	Value
Manufacturer	Analog Devices Inc Maxim Integrated
Package	TSSOP-20
Category	Communication Interface Chip/UART/485/232
Pins	20

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 Voltage	VCC	3		5.5	V		2
Supply Current, AutoShutdown disabled			8	15	mA	FORCEON = FORCEOFF = VCC, no load	2
Supply Current AutoShutdown	IASD		1	10	µA	FORCEON = GND, FORCEOFF = VCC, R1IN and R2IN idle, T1IN and T2IN idle	2
Supply Current Shutdown	ISD		1	10	µA	FORCEOFF = GND	2
Input-Logic Low	VT_IN,LO			0.8	V	T_IN, EN, FORCEON, FORCEOFF, VCC = +3.3V to +3.6V, +5.0V to +5.5V	2
Input-Logic High	VT_IN,HI	2			V	T_IN, FORCEON, FORCEOFF, EN; VCC = +3.3V	2
Input-Logic High	VT_IN,HI	2.4			V	T_IN, FORCEON, FORCEOFF, EN; VCC = +5.0V	2
Input Leakage Current	IIN,LKG	-1	0.01	1	µA	T_IN, EN, FORCEON, FORCEOFF	2
Output Leakage Current	IRX,OUT,LKG	-10	0.05	10	µA	EN = VCC	2
Output-Voltage Low	VRX,OUT,LO			0.4	V	IOUT = 1.6mA	2
Receiver-Input Level to INVALID Output High, positive level	VRX_IN, INV_HI	2.7			V	Figure 6a; positive level	3
Receiver-Input Level to INVALID Output High, negative level	VRX_IN, INV_HI			-2.7	V	Figure 6a; negative level	3
Receiver-Input Level to INVALID Output Low	VRX_IN, INV_LO	-0.3		0.3	V	Figure 6a	3
INVALID Output-Voltage Low	VRX,INV_LO			0.4	V	IOUT = 1.6mA	3
Input-Voltage Range	VRX,IN	-70		70	V	Note 3	3
Overvoltage Threshold	/VRX,OVTHR/	24	28.3	32	V		3
Input Threshold Low	VRX,LO			0.6	V	VCC = +3.3V	3
Input Threshold Low	VRX,LO			0.8	V	VCC = +5.0V	3
Input Threshold High	VRX,HI	2.4			V	VCC = +3.3V	3
Input Resistance	RRX,INRES	3	5	7	kΩ	-24V < VR_IN < +24V (Note 3)	3
Input Resistance	RRX,INRES	35		250	kΩ	VCC = V+ = V- = 0V	3
Output-Voltage Swing	VO	-5	6	5	V	RL = 3kΩ, Figure 4	3
Output Resistance	RTX,ROUT	300			Ω	VCC = V+ = V- = 0V, VT_OUT = ±2V	3
Overvoltage Protection Threshold	/VTX,FB/	14		19	V		3
Output Short-Circuit Current	ITX,SHORT	-80		80	mA	T_OUT = GND	3
Overvoltage Current	ITX,IFBOUT			6	mA	VT_OUT > VTX,FB	3
Overvoltage Current	ITX,IFBOUT	-6			mA	VT_OUT < -VTX,FB	3
Output Leakage Current in Shutdown Mode	ITX,LKG	450		900	µA	VT_OUT = +12V	3
Output Leakage Current in Shutdown Mode	ITX,LKG	-150		-80	µA	T_OUT = -12V, VCC = 0V, or +3V to +5.5V in shutdown mode	3
Overvoltage Protection Range		-70		70	V	R1IN, R2IN, T1OUT, T2OUT	3
ESD, IEC 61000-4-2 Contact Discharge		-8		8	kV	R1IN, R2IN, T1OUT, T2OUT; IEC 61000-4-2 Contact Discharge	3
ESD, Human Body Model		-8		8	kV	R1IN, R2IN, T1OUT, T2OUT	3
ESD, Human Body Model, all other pins		-2		2	kV	All other pins	3
Maximum Data Rate	DR	250			kbps	RL = 3kΩ, CL = 1000pF, one transmitter switching, Figure 1	4
Receiver Positive or Negative Threshold to INVALID High	tINVH			1	µs	VCC = 5V, Figure 6b	4
Receiver Positive or Negative Threshold to INVALID Low	tINVL			30	µs	VCC = 5V, Figure 6b	4
Receiver Edge to Transmitters Enabled	tWU			135	µs	VCC = 5V, Figure 6b	4
Receiver-Output Enable Time	tRX,EN			200	ns	Normal operation	4
Receiver-Output Disable Time	tRX,DIS			200	ns	Normal operation	4
Receiver Skew	/tPRHL - tPRLH/			50	ns		4
Transmitter Skew	/tPTHL - tPTLH/			200	ns	Note 5	4
Transmitter Time to Exit Shutdown	tSHDN			100	µs	Figure 7	4
Output Recovery Time	tTX,REC			100	µs	CL = 1nF, RL = 5k (Note 6)	4
Transition-Region Slew Rate	SROUT	6		30	V/µs	VCC = +3.3V, RL = 3kΩ to 7kΩ, TA = +25ºC, measured from +3V to -3V or -3V to +3V, one transmitter switching, CL = 1nF	4
Supply Voltage, absolute maximum VCC	VCC	-0.3		7	V	Voltages referenced to GND	2
Supply Voltage, absolute maximum V+	V+	-0.3		7	V	Voltages referenced to GND	2
Supply Voltage, absolute maximum V-	V-	-7		0.3	V	Voltages referenced to GND	2
V+ to V- differential, absolute maximum	V+ to V-			13	V		2
Input Voltage, absolute maximum (T1IN, T2IN, EN, FORCEON, FORCEOFF)		-0.3		6	V		2
Input Voltage, absolute maximum (R1IN, R2IN)		-70		70	V		2
Output Voltage, absolute maximum (T1OUT, T2OUT)		-70		70	V		2
Operating Temperature Range		-40		85	°C		2
Junction Temperature				150	°C		2
Storage Temperature Range		-65		150	°C		2
Lead Temperature				300	°C	soldering, 10s	2

CAD (KiCad official)

Symbol: MAX13223EEUP+T
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)
3D model files: max13223eeup-t-etched.step / max13223eeup-t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max13223eeup-t.step / max13223eeup-t.glb are the bare package body.

Provenance

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

Datasheet: Analog Devices Inc Maxim Integrated datasheet (12 pp, sha256 94b909882a40ee2f, retrieved 2026-10-18, 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