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/ATTM and compatibles Designed to support data rates up to 120 kbps Pinout compatible with ST75C185 SO-20 TSSOP20 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/ATTM 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. 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 0C to 70 C. 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). Interoperability 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 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 April 2009 Doc ID 6228 Rev 18 1/22 www.st.com 22 Contents ST75185C 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 2/22 Doc ID 6228 Rev 18 ST75185C Pin configuration 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) Doc ID 6228 Rev 18 3/22 Maximum ratings ST75185C 2 Maximum ratings Table 3. Absolute maximum ratings over operating free-air temperature range Symbol Parameter Value Unit VDD Supply voltage (1) 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 TA Operating free-air temperature range TSTG See dissipation rating table Storage temperature range Lead temperature 1.6 mm. from case for 10 sec. TL 0 to 70 C -65 to + 150 C 260 C 1. All voltage are with respect to the network ground terminal. Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 4. Dissipation rating table Package Power rating at TA 25C Derating factor above TA = 25C Power rating at TA 70C MICROPACKAGE (D) 1125 mW 9.0 mW/C 720 mW Table 5. Symbol Thermal data Parameter RthJC Thermal resistance junction-case RthJA Thermal resistance junction-ambient 1. This value is referred to single-layer PCB, JEDEC standard test board. 4/22 Doc ID 6228 Rev 18 TSSOP20 Unit 27.22 C/W 114.5 (1) C/W ST75185C Table 6. Maximum ratings 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 0 VCC V VI Driver input voltage IOH High level output current IOL Low level output current TA Operating free-air temperature range Driver -6 mA Receiver -0.5 Driver 6 Receiver 16 mA Doc ID 6228 Rev 18 0 70 C 5/22 Electrical characteristics ST75185C 3 Electrical characteristics Table 7. Supply currents Test conditions Symbol IDD ISS ICC 6/22 Value Parameter Supply current from VDD Supply current from VSS Supply current from VCC Unit VDD VSS 9 -9 12 -12 15 -15 9 -9 12 -12 15 -15 9 -9 12 -12 15 -15 9 -9 12 -12 15 -15 Min. No load. all inputs at 1.9V No load. all inputs at 0.8V No load. all inputs at 1.9V No load. all inputs at 0.8V No load. All inputs at 5V VCC = 5V Doc ID 6228 Rev 18 Typ. Max. 15 19 mA 25 4.5 5.5 mA 9 -15 -19 mA -25 -3.2 -3.2 mA -3.2 30 mA ST75185C Electrical characteristics VDD = 9 V, VSS = -9 V, VCC = 5 V, unless otherwise specified. Table 8. Driver electrical characteristics over operating free-air temperature range Value Symbol Parameter Test conditions VOH High level output voltage VIL = 0.8 V, RL = 3k (See Figure 3) VOL Low level output voltage (Note 3) VIH = 1.9 V, RL = 3k (See Figure 3) IIH High level input current IIL Unit Min. Typ. 6 7.5 Max. V -6 V VI = 5 V (See Figure 4) 10 A 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 VIH = 2 V VO = 0 V current (See Figure 3) 4.5 12 19.5 mA Output resistance RO Note: VDD = VSS = VCC = 0 V VO = -2 to 2 V (Note 3) -7.5 300 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 Table 9. Driver switching characteristics Value Symbol Parameter Test conditions Unit Min. Typ. Max. tPLH Propagation Delay Time, Low to High Level Output RL = 3 to 7 k CL = 15 pF (See Figure 5, Figure 6) 315 500 ns tPHL Propagation Delay Time, High to Low Level Output RL = 3 to 7 k CL = 15 pF (See Figure 5, Figure 6) 75 175 ns RL = 3 to 7 k CL = 15 pF (See Figure 5, Figure 6) 60 100 ns tTLH Transition Time Low to High Level Output RL = 3 to 7 k CL = 2500 pF (Note 4, Figure 5, Figure 6) 1.7 2.5 s RL = 3 to 7 k CL = 15 pF (See Figure 5, Figure 6) 40 7.5 ns RL = 3 to 7 k CL = 2500 pF (Note 4, Figure 5, Figure 6) 1.5 2.5 s Transition Time High to Low Level Output tTHL 4 Measured between -3 V and 3 V points of output waveform (EIA-232-E conditions), all unused inputs are tied. Doc ID 6228 Rev 18 7/22 Electrical characteristics Table 10. ST75185C Receiver electrical characteristics over operating conditions Value Symbol Parameter Test conditions Unit Min. VT+ Positive going threshold voltage (See Figure 9) VT- Negative going threshold voltage TA = 25 C (See Figure 9) Vhys Input hysteresis (VT+ - VT-) VOH High level output voltage VOL Low level output voltage IIH High level input current IIL Low level input current IOS Short-circuit output current Note: 0.75 Typ. Max. 2.2 2.4 0.97 V 0.5 IOH = -0.5mA VI = 3 V VIH = 0.75 V 2.6 Inputs Open 2.6 V 4 5 V IOL = 10 mA 0.2 VI = 25 V (See Figure 9) 3.6 VI = 3 V (See Figure 9) 0.43 VI = -25 V (See Figure 9) -3.6 VI = -3 V -0.43 (See Figure 9) V 0.45 V 8.3 mA -8.3 mA VI = 0 V VO = 0 V (See Figure 7) -3.4 -12 mA 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 11. Receiver switching characteristics Value Symbol Parameter Test conditions Unit Min. Typ. Max. tPLH Propagation delay time low to high level output RL = 5 k CL = 50 pF (See Figure 9) 400 1000 ns tPHL Propagation delay time high to low level output RL = 5 k CL = 50 pF (See Figure 9) 70 150 ns tTLH Transition time low to high level output RL = 5 k CL = 50 pF (See Figure 9) 200 525 ns tTHL Transition time high to low level output RL = 5 k CL = 50 pF (See Figure 9) 20 60 ns 8/22 Doc ID 6228 Rev 18 ST75185C Typical application 4 Typical application Figure 2. Application circuits Figure 3. Driver test circuit for VOH, ISO(H) and ISO(L) Doc ID 6228 Rev 18 9/22 Typical application ST75185C Figure 4. Driver test circuit for IIH and IIL Figure 5. Driver test circuit Figure 6. Driver voltage waveforms 10/22 Doc ID 6228 Rev 18 ST75185C Typical application Figure 7. Receiver test circuit for IOS Figure 8. Receiver test circuit for VT, VOH, VOL Figure 9. Receiver test circuit Doc ID 6228 Rev 18 11/22 Typical application ST75185C Figure 10. Receiver voltage waveforms Note: 12/22 1 The pulse generator has the following characteristics: tW = 25 s, PRR = 20 kHz, ZO = 50 , tr = tf < 50 ns 2 CL includes probe and jig capacitance. Doc ID 6228 Rev 18 ST75185C 5 Typical characteristics Typical characteristics Figure 11. Driver voltage transfer characteristics Figure 12. Driver short circuit output current vs. free-air temperature Figure 13. Device supply current vs. temperature Figure 14. Driver output current vs. output voltage Doc ID 6228 Rev 18 13/22 Typical characteristics ST75185C Figure 15. Driver output slew rate vs. load capacitance Figure 16. Receiver threshold vs. temperature Figure 17. Receiver threshold vs. supply voltage 14/22 Doc ID 6228 Rev 18 ST75185C 6 Application information: diodes on power supply Application information: diodes on power supply Diodes placed in series with the VDD and VSS leads protect the ST75185C in the fault condition in which the devices output are shorted to 15 V and the power supplies are at low state and provide low-impedance path to ground (see Figure 18). Figure 18. Diodes on power supply Doc ID 6228 Rev 18 15/22 Package mechanical data 7 ST75185C Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 16/22 Doc ID 6228 Rev 18 ST75185C Package mechanical data SO-20 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 2.35 2.65 0.093 0.104 A1 0.1 0.30 0.004 0.012 B 0.33 0.51 0.013 0.020 C 0.23 0.32 0.009 0.013 D 12.60 13.00 0.496 0.512 E 7.4 7.6 0.291 0.299 e 1.27 0.050 H 10.00 10.65 0.394 0.419 h 0.25 0.75 0.010 0.030 L 0.4 1.27 0.016 0.050 k 0 8 0 8 ddd 0.100 0.004 0016022D Doc ID 6228 Rev 18 17/22 Package mechanical data ST75185C TSSOP20 mechanical data mm. inch. Dim. Min. Typ. Max. A Min. Typ. Max. 1.2 A1 0.05 A2 0.8 b 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 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 1 e 0.65 BSC K 0 L 0.45 A 0.0256 BSC 0.60 8 0 0.75 0.018 8 0.024 0.030 A2 A1 b K e L E c D E1 PIN 1 IDENTIFICATION 1 0087225C 18/22 Doc ID 6228 Rev 18 ST75185C Package mechanical data Tape & reel SO-20 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 330 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Typ. 0.504 30.4 0.519 1.197 Ao 10.8 11 0.425 0.433 Bo 13.2 13.4 0.520 0.528 Ko 3.1 3.3 0.122 0.130 Po 3.9 4.1 0.153 0.161 P 11.9 12.1 0.468 0.476 Doc ID 6228 Rev 18 19/22 Package mechanical data ST75185C Tape & reel TSSOP20 mechanical data mm. inch. Dim. Min. A Max. Min. 330 13.2 Typ. Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 20/22 Typ. 0.504 22.4 0.519 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 Doc ID 6228 Rev 18 ST75185C Revision history 8 Revision history Table 12. Document revision history Date Revision Changes 28-Apr-2006 15 Order codes updated. 01-Jun-2006 16 Modified: Figure 2. 19-Dec-2007 17 Added: Table 5. 07-Apr-2009 18 Modified Table 5 on page 4. Doc ID 6228 Rev 18 21/22 ST75185C Please Read Carefully: Information in this document is provided solely in connection with ST products. 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