ST232B ST232C 5 V powered multi-channel RS-232 drivers and receivers Features ■ Supply voltage range: 4.5 to 5.5 V ■ Supply current no load (typ.): 5 mA ■ Transmitter output voltage swing (typ): ±7.8 V ■ Controlled output slew rate DIP SOP ■ Receiver input voltage range: ± 30 V ■ Data rate (typ.): 220 kbps ■ Operating temperature range: – -40 ° to 85 °C – 0 ° to 70 °C SOP Large TSSOP ■ Compatible with MAX232 and MAX202 Description The ST232 is a 2 driver, 2 receiver device following EIA/TIA-232 and V.28 communication standard. It is particularly suitable for applications where ±12 V is not available. The ST232 uses a single 5 V power supply and only four external capacitors (0.1 µF). Typical applications are in: portable computers, low power modems, interfaces translation, battery powered RS-232 system, multi-drop RS-232 networks. Table 1. Device summary Temperature Order code Package Packaging range ST232CN 0 to 70 °C DIP-16 25 parts per tube / 40 tube per box ST232CDR 0 to 70 °C SO-16 (tape and reel) 2500 parts per reel ST232BDR -40 to 85 °C SO-16 (tape and reel) 2500 parts per reel ST232CWR 0 to 70 °C SO-16 Large (tape and reel) 1000 parts per reel ST232BWR -40 to 85 °C SO-16 Large (tape and reel) 1000 parts per reel ST232CTR 0 to 70 °C TSSOP16 (tape and reel) 2500 parts per reel ST232BTR -40 to 85 °C TSSOP16 (tape and reel) 2500 parts per reel February 2008 Rev 14 1/19 www.st.com 19

ST232B - ST232C Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19

ST232B - ST232C Pin configuration 1 Pin configuration Figure 1. Pin connections (top view) Table 2. Pin description Pin n° Symbol Note 1 C + Positive terminal for the first charge pump capacitor 1 2 V+ Doubled voltage terminal 3 C - Negative terminal for the first charge pump capacitor 1 4 C + Positive terminal for the second charge pump capacitor 2 5 C - Negative terminal for the second charge pump capacitor 2 6 V- Inverted voltage terminal 7 T2 Second transmitter output voltage OUT 8 R2 Second receiver input voltage IN 9 R2 Second receiver output voltage OUT 10 T2 Second transmitter input voltage IN 11 T1 First transmitter input voltage IN 12 R1 First receiver output voltage OUT 13 R1 First receiver input voltage IN 14 T1 First transmitter output voltage OUT 15 GND Ground 16 V Supply voltage CC 3/19

Maximum ratings ST232B - ST232C 2 Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit V Supply voltage -0.3 to 6 V CC T Transmitter input voltage range -0.3 to (V + 0.3) V IN CC R Receiver input voltage range ± 30 V IN T Transmitter output voltage range (V + 0.3) to (V - 0.3) V OUT + - R Receiver output voltage range -0.3 to (V + 0.3) V OUT CC T Short circuit duration on T infinite SCTOUT OUT T Storage temperature range -65 to + 150 STG Note: 1 Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 2 No external supply can be applied to V+ terminal and V- terminal. 4/19

ST232B - ST232C Electrical characteristics 3 Electrical characteristics Table 4. Electrical characteristics (C - C = 0.1 µF, V = 5 V ± 10 %, T = -40 to 85 °C, unless otherwise specified. Typical 1 4 CC A values are referred to T = 25 °C). A Symbol Parameter Test condition Min. Typ. Max. Unit I V Power supply current No Load, T = 25°C 5 10 mA SUPPLY CC A Table 5. Transmitter electrical characteristics (C - C = 0.1 µF, V = 5 V ± 10 %, T = -40 to 85 °C, unless otherwise specified. Typical 1 4 CC A values are referred to T = 25 °C). A Symbol Parameter Test condition Min. Typ. Max. Unit All transmitter outputs are loaded V Output voltage swing ± 5 ± 7.8 V TOUT with 3kΩ to GND I Input leakage current ± 40 µA TIL V Input logic threshold low 0.8 V TIL V Input logic threshold high 2 V TIH T = 25°C, V = 5V SR Transition slew rate A CC 7 30 V/µs T R = 3 to 7kΩ, C = 50 to 2500pF (1) L L D Data rate (2) 120 220 kbits/s R R Transmitter output resistance V = V+ = V- = 0V V = ± 2V 300 Ω TOUT CC OUT Transmitter output short circuit I One T to GND ±10 ±60 mA SC current XOUT 1. Measured from 3 V to -3 V or from -3 V to 3 V 2. One transmitter output is loaded with R = 3 kΩ to 7 kΩ, C = 50 to 1000 pF L L 5/19

Electrical characteristics ST232B - ST232C Table 6. Receiver electrical characteristics (C - C = 0.1 µF, V = 5 V ± 10 %, T = -40 to 85 °C, unless otherwise specified. Typical 1 4 CC A values are referred to T = 25 °C). A Symbol Parameter Test condition Min. Typ. Max. Unit Receiver input voltage V -30 30 V RIN operating range T = 25°C, V = 5 V, R RS-232 input resistance A CC 3 5 7 kΩ RIN V = 5V RIN V RS-232 input threshold low T = 25°C, V = 5 V 0.8 1.2 V RIL A CC V RS-232 input threshold high T = 25°C, V = 5 V 1.7 2.4 V RIH A CC V RS-232 input hysteresis V = 5V 0.2 0.5 1 V RIHYS CC V TTL/CMOS output voltage low I = 3.2mA (to V ) 0.4 V ROL OUT CC V TTL/CMOS output voltage high I = -1mA (to GND) 3.5 V -0.4 V ROH OUT CC Receiver output short circuit I ±10 mA SCR current t Receiver propagation delay C = 150pF (1) 0.3 1 µs DR L 1. RS-232 in to TTL-CMOS out (from 50% to 50%) 6/19

ST232B - ST232C Typical application 4 Typical application Figure 2. Application circuit (1) (2) 1. C capacitors can even be 1µF ones 1-4 2. C can be common or biased capacitors 1-4 Table 7. Capacitance value (µF) C1 C2 C3 C4 C5 0.1 0.1 0.1 0.1 0.1 7/19

Typical performance characteristics ST232B - ST232C 5 Typical performance characteristics (Unless otherwise specified T = 25 °C) J Figure 3. Supply current vs temperature Figure 4. Data rate vs temperature Figure 5. Receiver propagation delay Figure 6. Driver propagation delay Figure 7. High level output voltage swing vs Figure 8. Low level output voltage swing vs temperature temperature 8/19

ST232B - ST232C Typical performance characteristics Figure 9. High level transmitter output short Figure 10. Low level transmitter output short circuit current vs temperature circuit current vs temperature Figure 11. High level receiver output short Figure 12. Low level receiver output short circuit current vs temperature circuit current vs temperature 9/19

Package mechanical data ST232B - ST232C 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. 10/19

ST232B - ST232C Package mechanical data Plastic DIP-16 (0.25) mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. a1 0.51 0.020 B 0.77 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L 3.3 0.130 Z 1.27 0.050 P001C 11/19

Package mechanical data ST232B - ST232C SO-16 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 1.75 0.068 a1 0.1 0.25 0.004 0.010 a2 1.64 0.063 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45° (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M 0.62 0.024 S 8° (max.) 0016020D 12/19

ST232B - ST232C Package mechanical data SO-16L mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 2.65 0.104 a1 0.1 0.2 0.004 0.008 a2 2.45 0.096 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.012 C 0.5 0.020 c1 45° (typ.) D 10.1 10.5 0.397 0.413 E 10.0 10.65 0.393 0.419 e 1.27 0.050 e3 8.89 0.350 F 7.4 7.6 0.291 0.300 G L 0.5 1.27 0.020 0.050 M 0.75 0.029 S 8° (max.) PO13I 13/19

Package mechanical data ST232B - ST232C TSSOP16 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 4.9 5 5.1 0.193 0.197 0.201 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 0080338D 14/19

ST232B - ST232C Package mechanical data Tape & reel SO-16 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 6.45 6.65 0.254 0.262 Bo 10.3 10.5 0.406 0.414 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 15/19

Package mechanical data ST232B - ST232C Tape & reel SO-16L 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 10.8 11.0 0.425 0.433 Bo 10.7 10.9 0.421 0.429 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 16/19

ST232B - ST232C Package mechanical data Tape & reel TSSOP16 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 6.7 6.9 0.264 0.272 Bo 5.3 5.5 0.209 0.217 Ko 1.6 1.8 0.063 0.071 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 17/19

Revision history ST232B - ST232C 7 Revision history Table 8. Document revision history Date Revision Changes 02-Sep-2005 11 Mistake I max. on table 5. TIL 27-Oct-2006 12 Order codes updated. 14-Nov-2007 13 Added Table1. 08-Feb-2008 14 Modified: Table1 on page1. 18/19

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