ST75185CTR

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April 2009 Doc ID 6228 Rev 18 1/22 22 ST75185C Multiple RS-232 drivers and receivers Features ■ Meets and exceeds the requirements of EIA/TIA-232-E and ITUV.28 standard ■ Single chip with easy interface between UART and serial port connector of IBM PC/AT™ and compatibles ■ Designed to support data rates up to 120 kbps ■ Pinout compatible with ST75C185 Description The ST75185C contains three drivers and five receivers. The pinout matches the DB9S connector design in order to decrease the part count, reduce the board space required and allow easy interconnection of the UART and serial port connector of IBM PC/AT™ and compatibles. The bipolar circuits and processing of the ST75185C provides a rugged low-cost solution for this function at the expense of quiescent power and external passive components relative to the ST75C185. The ST75185C complies with the requirements of the EIA/TIA 232-E and ITU (formally CCITT) v.28 standards. These standards are for data interchange between a host computer and peripheral at signalling rates up to 20 k-bits/s. The switching speeds of the ST75185C are fast enough to support rates up to 120 K-bits/s with lower capacitive loads (shorter cables). Inter- operability at the higher signalling rates cannot be assured unless the designer has design control of the cable and the interface circuits at the both ends. For inter-operability at signalling rates to 120 k-bits/s, use of EIA/ITA-423-B (ITU v.10) and EIA/ITA-422-B (ITU v.11) standards are recommended. The ST75185C is characterized for operation over the range of 0°C to 70 °C. SO-20 TSSOP20 Table 1. Device summary Order codes Temperature range Packages Packaging ST75185CTR 0 to 70 °C TSSOP20 (tape and reel) 2500 parts per reel ST75185CDR 0 to 70 °C SO-20 (tape and reel) 1000 parts per reel www.st.com

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Contents ST75185C 2/22 Doc ID 6228 Rev 18 Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 Application information: diodes on power supply . . . . . . . . . . . . . . . . 15 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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ST75185C Pin configuration Doc ID 6228 Rev 18 3/22 1 Pin configuration Figure 1. Pin connection IEC logic symbol and logic diagram Table 2. Pin description Pin n° Symbol Name and function 1 VDD Supply voltage (+12 V) 2 RA1 First receiver input 3 RA2 Second receiver input 4 RA3 Third receiver input 5 DY1 First driver output 6 DY2 Second driver output 7 RA4 Fourth receiver input 8 DY3 Third driver output 9 RA5 Fifth receiver input 10 VSS Supply voltage (-12V) 11 GND Ground 12 RY5 Fifth receiver output 13 DA3 Third driver input 14 RY4 Fourth receiver output 15 DA2 Second driver input 16 DA1 First driver input 17 RY3 Third receiver output 18 RY2 Second receiver output 19 RY1 First receiver output 20 VCC Supply voltage (+5 V)

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Maximum ratings ST75185C 4/22 Doc ID 6228 Rev 18 2 Maximum ratings Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3. Absolute maximum ratings over operating free-air temperature range Symbol Parameter Value Unit VDD Supply voltage (1) 1. All voltage are with respect to the network ground terminal. 15 V VSS Supply voltage (1) -15 V VCC Supply voltage (1) 10 V VI Input voltage range (Driver) -15 to 7 V VI Input voltage range (Receiver) -30 to 30 V VO Output voltage range (Driver) -15 to 15 V IO Receiver low level output current 20 mA PD Continuous total power dissipation See dissipation rating table TA Operating free-air temperature range 0 to 70 °C TSTG Storage temperature range -65 to + 150 °C TL Lead temperature 1.6 mm. from case for 10 sec. 260 °C Table 4. Dissipation rating table Package Power rating at TA ≤ 25°C Derating factor above TA = 25°C Power rating at TA ≤ 70°C MICROPACKAGE (D) 1125 mW 9.0 mW/°C 720 mW Table 5. Thermal data Symbol Parameter TSSOP20 Unit RthJC Thermal resistance junction-case 27.22 °C/W RthJA Thermal resistance junction-ambient 114.5 (1) °C/W 1. This value is referred to single-layer PCB, JEDEC standard test board.

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ST75185C Maximum ratings Doc ID 6228 Rev 18 5/22 Table 6. Recommended operating conditions Symbol Parameter Min. Max. Unit. VDD Supply voltage 7.5 15 V VSS Supply voltage -7.5 -15 V VCC Supply voltage 4.5 5.5 V VI Driver input voltage 0 VCC V IOH High level output current Driver -6 mA Receiver -0.5 IOL Low level output current Driver 6 mA Receiver 16 TA Operating free-air temperature range 0 70 °C

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Electrical characteristics ST75185C 6/22 Doc ID 6228 Rev 18 3 Electrical characteristics Table 7. Supply currents Symbol Parameter Test conditions Value Unit VDD VSS Min. Typ. Max. IDD Supply current from VDD 9 -9 No load. all inputs at 1.9V 15 mA12 -12 19 15 -15 25 9 -9 No load. all inputs at 0.8V 4.5 mA12 -12 5.5 15 -15 9 ISS Supply current from VSS 9 -9 No load. all inputs at 1.9V -15 mA12 -12 -19 15 -15 -25 9 -9 No load. all inputs at 0.8V -3.2 mA12 -12 -3.2 15 -15 -3.2 ICC Supply current from VCC No load. All inputs at 5V VCC = 5V 30 mA

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ST75185C Electrical characteristics Doc ID 6228 Rev 18 7/22 VDD = 9 V, VSS = -9 V, VCC = 5 V, unless otherwise specified. Note: 1 The algebraic convention, where the more positive (less negative) limits designated as maximum, is used in this datasheet for logic levels only (e.g. if - 10 V is a maximum, the typical value is a more negative voltage). 2 Output short circuit conditions must maintain the total power dissipation below absolute maximum ratings. 3 Test conditions are those specified by EIA-232-E and as listed above. VDD = 12 V, VSS = -12 V, VCC = 5 V, TA = 25 °C 4 Measured between -3 V and 3 V points of output waveform (EIA-232-E conditions), all unused inputs are tied. Table 8. Driver electrical characteristics over operating free-air temperature range Symbol Parameter Test conditions Value Unit Min. Typ. Max. VOH High level output voltage VIL = 0.8 V, RL = 3kΩ (See Figure 3) 6 7.5 V VOL Low level output voltage (Note 3) VIH = 1.9 V, RL = 3kΩ (See Figure 3) -7.5 -6 V IIH High level input current VI = 5 V (See Figure 4) 10 µA IIL Low level input current VI = 0 V (See Figure 4) −1.6 mA IOS(H) High level short circuit output current (Note 4) VIL = 0.8 V, VO = 0 V (See Figure 3) -4.5 −12 −19.5 mA IOS(L) Low level short circuit output current VIH = 2 V VO = 0 V (See Figure 3) 4.5 12 19.5 mA RO Output resistance VDD = VSS = VCC = 0 V VO = -2 to 2 V (Note 3) 300 Ω Table 9. Driver switching characteristics Symbol Parameter Test conditions Value Unit Min. Typ. Max. tPLH Propagation Delay Time, Low to High Level Output RL = 3 to 7 kΩ CL = 15 pF (See Figure 5, Figure 6) 315 500 ns tPHL Propagation Delay Time, High to Low Level Output RL = 3 to 7 kΩ CL = 15 pF (See Figure 5, Figure 6) 75 175 ns tTLH Transition Time Low to High Level Output RL = 3 to 7 kΩ CL = 15 pF (See Figure 5, Figure 6) 60 100 ns RL = 3 to 7 kΩ CL = 2500 pF (Note 4, Figure 5, Figure 6) 1.7 2.5 µs tTHL Transition Time High to Low Level Output RL = 3 to 7 kΩ CL = 15 pF (See Figure 5, Figure 6) 40 7.5 ns RL = 3 to 7 kΩ CL = 2500 pF (Note 4, Figure 5, Figure 6) 1.5 2.5 µs

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Electrical characteristics ST75185C 8/22 Doc ID 6228 Rev 18 Note: All typical values are at TA = 25 °C, VCC = 5 V, VDD = 9 V and VSS = -9 V VDD = 12 V, VSS = -12 V, VCC = 5 V TA = 25 °C Table 10. Receiver electrical characteristics over operating conditions Symbol Parameter Test conditions Value Unit Min. Typ. Max. VT+ Positive going threshold voltage (See Figure 9) 2.2 2.4 V VT- Negative going threshold voltage TA = 25 °C (See Figure 9) 0.75 0.97 V Vhys Input hysteresis (VT+ - VT-) 0.5 V VOH High level output voltage IOH = -0.5mA VIH = 0.75 V 2.6 4 5 V Inputs Open 2.6 VOL Low level output voltage VI = 3 V IOL = 10 mA 0.2 0.45 V IIH High level input current VI = 25 V (See Figure 9) 3.6 8.3 mA VI = 3 V (See Figure 9) 0.43 IIL Low level input current VI = -25 V (See Figure 9) -3.6 -8.3 mA VI = -3 V (See Figure 9) -0.43 IOS Short-circuit output current VI = 0 V VO = 0 V (See Figure 7) -3.4 -12 mA Table 11. Receiver switching characteristics Symbol Parameter Test conditions Value Unit Min. Typ. Max. tPLH Propagation delay time low to high level output RL = 5 kΩ CL = 50 pF (See Figure 9) 400 1000 ns tPHL Propagation delay time high to low level output RL = 5 kΩ CL = 50 pF (See Figure 9) 70 150 ns tTLH Transition time low to high level output RL = 5 kΩ CL = 50 pF (See Figure 9) 200 525 ns tTHL Transition time high to low level output RL = 5 kΩ CL = 50 pF (See Figure 9) 20 60 ns

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ST75185C Typical application Doc ID 6228 Rev 18 9/22 4 Typical application Figure 2. Application circuits Figure 3. Driver test circuit for VOH, ISO(H) and ISO(L)