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MAX3221EUE+T

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Analog Devices Inc Maxim Integrated RS232 ICs, TSSOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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MAX3221EUE+T

Analog Devices Inc Maxim Integrated · RS232 ICs · TSSOP-16

MAX3221EUE+T from Analog Devices Inc 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 EN input Receiver enable control: drive low for normal operation and drive high to force the receiver outputs into a high-impedance state.
2 C1+ passive Positive terminal of the voltage doubler charge-pump capacitor (C1, 0.1µF for 3.3V operation).
3 V+ power_out +5.5V supply generated by the charge pump, which requires a reservoir capacitor (C3) and is regulated over the +3.0V to +5.5V VCC range.
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, which requires a reservoir capacitor (C4).
8 R1IN input RS-232 receiver input with an input voltage range of -25V to +25V and a typical input resistance of 5kΩ.
9 R1OUT output TTL/CMOS receiver output; the receiver is an inverting three-state output that goes high-impedance when EN is driven high.
10 INVALID output Output of the valid signal detector that is high when a valid RS-232 level is present on the receiver inputs and low when the device is in AutoShutdown.
11 T1IN input TTL/CMOS transmitter input with logic threshold low of 0.8V maximum and threshold high of 2.0V (VCC = 3.3V) or 2.4V (VCC = 5.0V).
12 FORCEON input Drive high to override the automatic circuitry and keep the transmitters on; FORCEOFF must be high for this to apply.
13 T1OUT output RS-232 transmitter output with a voltage swing of at least ±5.0V into a 3kΩ load, forced to high-impedance when the transmitters are disabled.
14 GND power_in Ground reference for the device.
15 VCC power_in Supply voltage of +3.0V to +5.5V.
16 FORCEOFF input Drive low to shut down the transmitters and on-board power supply; this overrides all automatic circuitry and FORCEON.

Key specifications

Parameter Value
Manufacturer Analog Devices Inc Maxim Integrated
Package TSSOP-16
Category Interface
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
Input Logic Threshold High (VCC = 3.3V) 2 V T_IN, EN, FORCEON, FORCEOFF; VCC = 3.3V 2
Input Logic Threshold High (VCC = 5.0V) 2.4 V T_IN, EN, FORCEON, FORCEOFF; VCC = 5.0V 2
Input Logic Threshold Low 0.8 V T_IN, FORCEON, FORCEOFF, EN (MAX3223) 2
Supply Current, AutoShutdown 1 10 µA VCC = 3.3V or 5.0V, TA = +25°C; All R_IN open, FORCEON = GND, FORCEOFF = VCC 2
Supply Current, Shutdown 1 10 µA FORCEOFF = GND 2
Supply Current, AutoShutdown Disabled 0.3 1 mA FORCEON = FORCEOFF = VCC, no load 2
Input Leakage Current -1 0.01 1 µA T_IN, EN, FORCEON, FORCEOFF 2
Output Leakage Current (receivers) -10 0.05 10 µA Receivers disabled 2
Output Voltage Low 0.4 V IOUT = 1.6mA 2
Receiver Input Thresholds to Transmitters Disabled -0.3 0.3 V 1μA supply current, Figure 5 2
INVALID Output Voltage Low 0.4 V IOUT = 1.6mA 2
Receiver Positive or Negative Threshold to INVALID High (tINVH) tINVH 1 µs Figure 5 3
Receiver Positive or Negative Threshold to INVALID Low (tINVL) tINVL 30 µs Figure 5 3
Receiver Threshold to Transmitters Enabled (tWU) tWU 250 µs Figure 5 2
Receiver Input Voltage Range -25 25 V 3
Input Threshold Low (VCC = 3.3V) 0.6 1.2 V TA = +25°C; VCC = 3.3V 3
Input Threshold Low (VCC = 5.0V) 0.8 1.5 V TA = +25°C; VCC = 5.0V 3
Input Threshold High (VCC = 3.3V) 1.5 2.4 V TA = +25°C; VCC = 3.3V 3
Input Threshold High (VCC = 5.0V) 1.8 2.4 V TA = +25°C; VCC = 5.0V 3
Input Resistance 3 5 7 kΩ TA = +25°C 3
Transmitter Output Voltage Swing 5 5.4 V All transmitter outputs loaded with 3kΩ to ground 3
Transmitter Output Resistance 300 10 MΩ VCC = V+ = V- = 0V, transmitter output = ±2V 3
Transmitter Output Short-Circuit Current 35 60 mA 3
Transmitter Output Leakage Current -25 25 µA VOUT = ±12V, VCC = 0V or 3.0V to 5.5V, transmitters disabled 3
Maximum Data Rate 120 235 kbps RL = 3kΩ, CL = 1000pF, one transmitter switching 3
Transmitter Skew (MAX3221/MAX3223) │tPHL, tPLH│ 200 ns MAX3221/MAX3223 3
Receiver Skew (MAX3221/MAX3223) │tPHL, tPLH│ 100 ns MAX3221/MAX3223 3
Transition-Region Slew Rate 4 8 30 V/µs VCC = 3.3V, RL = 3kΩ to 7kΩ, TA = +25°C, measured from +3V to -3V or -3V to +3V; CL = 200pF to 2500pF 3
Transition-Region Slew Rate 6 30 V/µs VCC = 3.3V, RL = 3kΩ to 7kΩ, TA = +25°C, measured from +3V to -3V or -3V to +3V; CL = 200pF to 1000pF 3
Supply Voltage VCC VCC 3 5.5 V C1-C4 = 0.1μF, TA = TMIN to TMAX 2
Operating Temperature Range (MAX32_ E _) TA -40 85 °C MAX32_ E _ (MAX3221EUE) 2
VCC VCC -0.3 6 V 2
V+ V+ -0.3 7 V Note 1 2
V- V- -7 0.3 V Note 1 2
V+ + /V-/ V+ + /V-/ 13 V Note 1 2
Input Voltage (T_IN, FORCEOFF, FORCEON, EN) -0.3 6 V T_IN, FORCEON, FORCEOFF, EN (MAX3223) 2
Input Voltage (R_IN) R_IN -25 25 V 2
Output Voltage (T_OUT) T_OUT -13.2 13.2 V 2
Output Voltage (R_OUT, INVALID) R_OUT, INVALID -0.3 V Upper limit printed as VCC + 0.3V 2
Storage Temperature Range -65 150 °C 2
Lead Temperature 300 °C Soldering, 10s 2
Thermal Resistance θJA (16 TSSOP, single layer board) θJA 106 °C/W 16 TSSOP (U16+1), single layer board 15
Thermal Resistance θJC (16 TSSOP, single layer board) θJC 27 °C/W 16 TSSOP (U16+1), single layer board 15
Thermal Resistance θJA (16 TSSOP, multi layer board) θJA 90 °C/W 16 TSSOP (U16+1), multi layer board 15
Thermal Resistance θJC (16 TSSOP, multi layer board) θJC 27 °C/W 16 TSSOP (U16+1), multi layer board 15

CAD (KiCad official)

  • Symbol: MAX3221EUE+T
  • Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
  • 3D model: TSSOP-16 (KiCad packages3D, STEP)
  • 3D model files: max3221eue-t-etched.step / max3221eue-t-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max3221eue-t.step / max3221eue-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 (16 pp, sha256 4b10ea08c7155060, retrieved 2026-10-19, 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