ST3222EB ST3222EC ± 15 kV ESD protected, 3 to 5.5 V low power, up to 250 Kbps, RS-232 drivers and receivers Features ■ ESD protection for RS-232 I/O pins ± 15 kV human body model, ± 8 kV IEC 1000-4-2 contact discharge ■ 300 µA supply current ■ 250KBps minimum guarantee data rate TSSOP SSOP ■ 6 V/µs minimum guarantee slew rate ■ Meet EIA/TIA-232 specification down to 3 V ■ Available in SSOP20 and TSSOP20 Description Typical applications are Notebook, Sub-notebook The ST3222E is a 3 V powered EIA/TIA-232 and and Palmtop Computers, Battery Powered V.28/V.24 communications interface with low Equipment, Hand-Held Equipment, Peripherals power requirements, high data-rate capabilities and Printers. and enhanced electrostatic discharge (ESD) protection to ± 8 kV using IEC1000-4-2 Contact Discharge and ±15 kV using the Human Body Model. ST3222E has a proprietary low dropout transmitter output stage providing true RS-232 performance from 3 to 5 V supplies with a dual charge pump. The charge pump requires only four small 0.1 mF external capacitors for operation form 3 V supply. The device has two receivers and two drivers. The ST3222E features a 1 mA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers can remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1 mA supply current. The device is guaranteed to run at data rates of 250 Kbps while maintaining RS-232 output levels. Table 1. Device summary Temperature Order codes Package Packaging range ST3222ECPR 0 to 70 °C SSOP20 (tape and reel) 1350 parts per reel ST3222EBPR -40 to 85 °C SSOP20 (tape and reel) 1350 parts per reel ST3222ECTR 0 to 70 °C TSSOP20 (tape and reel) 2500 parts per reel ST3222EBTR -40 to 85 °C TSSOP20 (tape and reel) 2500 parts per reel January 2008 Rev 8 1/15 www.st.com 15

Contents ST3222E Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15

ST3222E Pin configuration 1 Pin configuration Figure 1. Pin connection Table 2. Pin description Pin n° Symbol Name and function Receiver enable control. drive low for normal operation. Drive high to force the 1 EN receivers outputs (R_OUT) into a high-impedance state. 2 C + Positive terminal for the first charge pump capacitor 1 3 V+ 5.5V Generated by the charge pump. 4 C - Negative terminal for the first charge pump capacitor 1 5 C + Positive terminal for the second charge pump capacitor 2 6 C - Negative terminal for the second charge pump capacitor 2 7 V- -5.5V Generated by the charge pump. 8 T2 Second transmitter output voltage OUT 9 R2 Second receiver input voltage IN 10 R2 Second receiver output voltage OUT 11 NC Not connected 12 T2 Second transmitter input voltage IN 13 T1 First transmitter input voltage IN 14 NC Not connected 15 R1 First receiver output voltage OUT 16 R1 First receiver input voltage IN 17 T1 First transmitter output voltage OUT 18 GND Ground 19 V Supply voltage CC 20 SHDN Active low shutdown control input. drive low to shut-down transmitter and charge pump 3/15

Absolute maximum ratings ST3222E 2 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit V Supply voltage -0.3 to 6 V CC V+ Doubled voltage terminal (V - 0.3) to 7 V CC V- Inverted voltage terminal 0.3 to -7 V V+ +|V-| 13 V T Transmitter input voltage range -0.3 to 6 V IN R Receiver input voltage range ± 25 V IN T Transmitter output voltage range ± 13.2 V OUT R Receiver output voltage range -0.3 to (V + 0.3) V OUT CC t Transmitter output short to gnd time Continuous SHORT Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Externally applied V+ and V- can have a maximum magnitude of +7 V, but their absolute addition can not exceed 13 V. Running on internal charge pump, intrinsic self limitation allows exceeding those values without any damage. Startup voltage sequence (V , then V+, then V-) is critical, therefore it is not recommended CC to use this device using externally applied voltage to V+ and V-. Table 4. Shutdown and enable control truth table SHDN EN T-OUT R-OUT 0 0 High Z Active 0 1 High Z High Z 1 0 Active Active 1 1 Active High Z Table 5. ESD performance: transmitter outputs, receiver inputs Symbol Parameter Test conditions Min. Typ. Max. Unit ESD ESD protection voltage Human body model ±15 kV ESD ESD protection voltage IEC-1000-4-2 ±8 kV 4/15

ST3222E Electrical characteristics 3 Electrical characteristics Table 6. Electrical characteristics (C - C = 0.1 µF, V = 3 V to 5.5 V, T = -40 to 85 °C, unless 1 4 CC A otherwise specified. Typical values are referred to T = 25 °C) A Symbol Parameter Test conditions Min. Typ. Max. Unit I V power supply current No load, SHDN = V , T = 25°C 0.3 1 mA SUPPLY CC CC A I Shutdown supply current No load, SHDN = V , T = 25°C 1 10 µA SHDN CC A Table 7. Logic input electrical characteristics (C - C = 0.1 µF, V = 3 V to 5.5 V, 1 4 CC T = -40 to 85 °C, unless otherwise specified. Typical values are referred to T = 25 °C) A A Symbol Parameter Test conditions Min. Typ. Max. Unit V Input logic threshold low T-IN, EN, SHDN (Note: 1) 0.8 V IL V = 3.3 V 2 CC V Input logic threshold high V IH V = 5 V 2.4 CC Transmitter input V 0.25 V HYS hysteresis I Input leakage current T-IN, EN, SHDN ± 0.01 ± 1 µA IL Note: 1 Transmitter input hysteresis is typically 250 mV Table 8. Transmitter electrical characteristics (C - C = 0.1 µF V = 3 V to 5.5 V, 1 4 CC T = -40 to 85 °C, unless otherwise specified. Typical values are referred to T = 25 °C) A A Symbol Parameter Test conditions Min. Typ. Max. Unit All transmitter outputs are loaded with V Output voltage swing ± 5 ± 5.4 V TOUT 3 KΩ to GND Transmitter output R V = V+ = V- = 0 V, V = ± 2 V 300 10M Ω TOUT resistance CC OUT Output short circuit I ± 60 mA TSC current V = 0 or 3 V to 3.6 V, V = ± 12 V I Output leakage current CC OUT ± 25 µA TOL Transmitters disable 5/15

Electrical characteristics ST3222E Table 9. Receiver electrical characteristics (C - C = 0.1 µF, V = 3 V to 5.5 V, 1 4 CC T = -40 to 85 °C, unless otherwise specified. Typical values are referred to T = 25 °C) A A Symbol Parameter Test conditions Min. Typ. Max. Unit I Output leakage current R-OUT, EN = V , receiver disabled ± 0.05 ± 10 µA OL CC Receiver input voltage V -25 25 V RIN operating range T = 25°C, V = 3.3 V 0.6 1.2 A CC V Input threshold low V RIL T = 25°C, V = 5 V 0.8 1.5 A CC T = 25°C, V = 3.3 V 1.5 2.4 A CC V Input threshold high V RIH T = 25°C, V = 5 V 1.8 2.4 A CC V Input hysteresis 0.5 V RIHYS R Input resistance T = 25°C 3 5 7 KΩ RIN A V Output voltage low I = 1.6 mA 0.4 V ROL OUT V - V Output voltage high I = -1 mA V -0.6 CC V ROH OUT CC 0.1 Table 10. Timing characteristics (C - C = 0.1 µF, V = 3 V to 5.5 V, T = -40 to 85 °C, unless 1 4 CC A otherwise specified. Typical values are referred to T = 25 °C) A Symbol Parameter Test conditions Min. Typ. Max. Unit R = 3 KΩ, C = 1000 pF D Data transfer rate L L2 250 Kbps R one transmitter switching t Propagation delay input to PHLR R to R , C = 150 pF 0.15 µs t output XIN XOUT L PLHR |t Transmitter propagation PHLT 200 ns - t | delay difference (1) THL Receiver output enable t Normal operation 50 ns OER time Receiver output disable t Normal operation 50 ns ODR time |t Receiver propagation PHLR 50 ns - t | delay difference THR T = 25°C R = 3 KΩ to 7 KΩ A L V = 3.3 V CC 6 30 V/µs measured from +3V to -3V or -3V to +3V C = 150 pF to 1000 pF L S Transition slew rate RT T = 25°C R = 3 KΩ to 7 KΩ A L V = 3.3 V CC 4 30 V/µs measured from +3V to -3V or -3V to +3V C = 150 pF to 2500 pF L 1. Transmitter Skew is measured at the transmitter zero cross points 6/15

ST3222E Application circuits 4 Application circuits Figure 2. Application schematic Table 11. C apacitance value (µF) V C1 C2 C3 C4 Cbypass CC 3.0 to 3.6 0.1 0.1 0.1 0.1 0.1 4.5 to 5.5 0.047 0.33 0.33 0.33 0.33 3.0 to 5.5 0.22 0.1 0.1 0.1 0.22 7/15

Typical performance characteristics ST3222E 5 Typical performance characteristics (unless otherwise specified T = 25 °C) J Figure 3. Output current vs output high Figure 4. Output current vs output high voltage voltage Figure 5. Output current vs output low Figure 6. Output current vs output low voltage voltage Figure 7. Voltage transfer characteristics for Figure 8. Receiver input resistance transmitter inputs 8/15

ST3222E Package mechanical data 6 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 9/15

Package mechanical data ST3222E SSOP20 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 2 0.079 A1 0.05 0.002 A2 1.65 1.75 1.85 0.065 0.069 0.073 b 0.22 0.38 0.009 0.015 c 0.09 0.25 0.004 0.010 D 6.9 7.2 7.5 0.272 0.283 0.295 E 7.4 7.8 8.2 0.291 0.307 0.323 E1 5 5.3 5.6 0.197 0.209 0.220 e 0.65 BSC 0.0256 BSC K 0° 4° 8° 0° 4° 8° L 0.55 0.75 0.95 0.022 0.030 0.037 A A2 K L A1 b e c E D E1 PIN 1 IDENTIFICATION 1 0061436C 10/15

ST3222E Package mechanical data TSSOP20 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 1.2 0.047 A1 0.05 0.15 0.002 0.004 0.006 A2 0.8 1 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 D 6.4 6.5 6.6 0.252 0.256 0.260 E 6.2 6.4 6.6 0.244 0.252 0.260 E1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 BSC 0.0256 BSC K 0° 8° 0° 8° L 0.45 0.60 0.75 0.018 0.024 0.030 A A2 K L A1 b e c E D E1 PIN 1 IDENTIFICATION 1 0087225C 11/15

Package mechanical data ST3222E Tape & reel SSOP20 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 0.882 Ao 8.4 8.6 0.331 0.339 Bo 7.7 7.9 0.303 0.311 Ko 2.9 3.1 0.114 0.122 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 12/15

ST3222E Package mechanical data Tape & reel TSSOP20 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 0.882 Ao 6.8 7 0.268 0.276 Bo 6.9 7.1 0.272 0.280 Ko 1.7 1.9 0.067 0.075 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 13/15

Revision history ST3222E 7 Revision history Table 12. Document revision history Date Revision Changes 22-Mar-2006 6 Order codes updated. 23-Aug-2007 7 Added Table1 in cover page. 21-Jan-2008 8 Added note on Table3. 14/15

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