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UM213EEASR

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Union Semiconductor RS232 ICs, SSOP-28. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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UM213EEASR

Union Semiconductor · RS232 ICs · SSOP-28

UM213EEASR from Union Semiconductor, in a SSOP-28. 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 TOUT3 output RS-232 driver 3 output, protected to ±15kV ESD.
2 TOUT1 output RS-232 driver 1 output, protected to ±15kV ESD.
3 TOUT2 output RS-232 driver 2 output, protected to ±15kV ESD.
4 RIN2 input RS-232 receiver 2 input, tolerates ±30V and protected to ±15kV ESD.
5 ROUT2 tri_state Receiver 2 TTL/CMOS output, high-impedance in shutdown or when EN is low.
6 TIN2 input Driver 2 TTL/CMOS input, logic low below 0.8V and high above 2.4V.
7 TIN1 input Driver 1 TTL/CMOS input, logic low below 0.8V and high above 2.4V.
8 R1OUT tri_state Receiver 1 TTL/CMOS output, high-impedance in shutdown or when EN is low.
9 R1IN input RS-232 receiver 1 input, tolerates ±30V and protected to ±15kV ESD.
10 GND power_in Ground.
11 VCC power_in +4.5V to +5.5V supply voltage input; bypass to ground with at least 0.1µF.
12 C1+ passive Positive terminal of charge pump capacitor C1 (0.1µF).
13 V+ power_out Charge pump output regulated to +6.5V; pulled to VCC in shutdown.
14 C1- passive Negative terminal of charge pump capacitor C1 (0.1µF).
15 C2+ passive Positive terminal of charge pump capacitor C2 (0.1µF).
16 C2- passive Negative terminal of charge pump capacitor C2 (0.1µF).
17 V- power_out Charge pump output regulated to -6.5V; pulled to ground in shutdown.
18 RIN5 input RS-232 receiver 5 input, stays active in shutdown, tolerates ±30V.
19 ROUT5 tri_state Receiver 5 TTL/CMOS output, remains active in shutdown when EN is high.
20 TIN3 input Driver 3 TTL/CMOS input, logic low below 0.8V and high above 2.4V.
21 TIN4 input Driver 4 TTL/CMOS input, logic low below 0.8V and high above 2.4V.
22 ROUT4 tri_state Receiver 4 TTL/CMOS output, remains active in shutdown when EN is high.
23 RIN4 input RS-232 receiver 4 input, stays active in shutdown, tolerates ±30V.
24 EN input Receiver enable, active high; low puts receiver outputs in high-impedance, no effect on drivers or charge pumps.
25 SHDN input Active-low shutdown; low turns off charge pumps and transmitters, reducing supply current to about 1µA.
26 ROUT3 tri_state Receiver 3 TTL/CMOS output, high-impedance in shutdown or when EN is low.
27 RIN3 input RS-232 receiver 3 input, tolerates ±30V and protected to ±15kV ESD.
28 TOUT4 output RS-232 driver 4 output, protected to ±15kV ESD.

Key specifications

Parameter Value
Manufacturer Union Semiconductor
Package SSOP-28
Category Interface
Pins 28

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
VCC Supply Voltage VCC -0.3 6 V 3
Voltage on V+ V+ 9 V 3
Voltage on V- V- -9 0.3 V 3
Voltage on RIN_ -30 30 V 3
Continuous Power Dissipation SSOP28 PD 762 mW TA=70°C 3
Operating Temperature Range TA -40 85 °C 3
Storage Temperature Range TSTG -65 165 °C 3
Maximum Lead Temperature for Soldering TL 300 °C 10 seconds 3
Voltage on ROUT_ -0.3 V Max is (VCC+0.3) 3
Voltage on TIN_ -0.3 V Max is (VCC+0.3) 3
Supply Voltage Input VCC (operating) VCC 4.5 5.5 V 6
Output Voltage Swing 5 6 V All transmitter outputs loaded with 3kΩ to ground 4
VCC Power Supply Current ICC 0.6 1 mA No load 4
Shutdown Supply Current (UM213) 0.1 50 μA UM213 4
Input Logic Threshold Low 0.8 V TIN, EN, SHDN 4
Input Logic Threshold High 2.4 V TIN, EN, SHDN 4
RS-232 Input Voltage Operating Range -30 30 V 4
Receiver Input Threshold Low (Active Mode) 0.8 1.2 V VCC=+5V, TA=25°C, Active Mode 4
Receiver Input Threshold Low (Shut down Mode) 0.6 1.5 V VCC=+5V, TA=25°C, Shut down Mode 4
Receiver Input Threshold High (Active Mode) 1.7 2.4 V VCC=+5V, TA=25°C, Active Mode 4
Receiver Input Threshold High (Shut down Mode) 1.5 2.4 V VCC=+5V, TA=25°C, Shut down Mode 4
Input Hysteresis 0.2 0.5 1 V VCC=+5V, no hysteresis in shutdown 4
Input Resistance 3 5 7 kΩ VCC=+5V, TA=25°C 4
TTL/CMOS Output Voltage Low 0.4 V IOUT=1.6mA 4
TTL/CMOS Output Voltage High 3.5 V IOUT=1.0mA 4
TTL/CMOS Output Leakage Current -10 0.05 10 μA EN=VCC, EN=0V, 0≤ROUT≤VCC 4
Output Enable Time (UM211/213) 600 ns UM211/213 4
Output Disable Time (UM211/213) 200 ns UM211/213 4
Receiver Propagation Delay (UM213) 4 40 μs SHDN=0V, UM213 4
Receiver Propagation Delay (UM213) 0.5 10 μs SHDN=VCC, UM213 4
Transmitter Output Resistance 300 Ω VCC=V+=V-=0V, VOUT=±2V 4
Transition Region Slew Rate 3 5.5 30 V/μs CL=50pF to 2500pF, RL=3kΩ to 7kΩ, VCC=+5V, TA=25°C, measured from +3V to -3V or -3V to +3V 4
RS-232 Output Short Circuit Current 10 30 mA 4
Maximum Data Rate 120 250 kbps RL=3kΩ to 7kΩ, CL=50pF to 1000pF, one transmitter 4

CAD (KiCad official)

  • Symbol: UM213EEASR
  • Footprint: Package_SO:SSOP-28_5.3x10.2mm_P0.65mm
  • 3D model: SSOP-28 (KiCad packages3D, STEP)
  • 3D model files: um213eeasr-etched.step / um213eeasr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); um213eeasr.step / um213eeasr.glb are the bare package body.

Provenance

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

  • Datasheet: Union Semiconductor datasheet (27 pp, sha256 95e79390224c6dfd, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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