ST75185 MULTIPLE RS-232 DRIVERS AND RECEIVERS ■ ■ ■ ■ 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 ST75185 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 ST75185 provides a rugged low-cost solution for this function at the expense of quiescent power and external passive components relative to the ST75C185. The ST75185 complies with the requirements of the EIA/TIA 232-E and ITU (formally CCITT) v.28 N D (Plastic Package) (Micro Package) ORDER CODES : ST75185CN ST75185CD standards. These standards are for data interchange between a host computer and peripheral at signalling rates up to 20k-bits/s. The switching speeds of the ST75185 are fast enough to support rates up to 120K-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 interoperability 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 ST75185 is characterized for operation over the range of 0oC to 70oC. PIN CONNECTION IEC LOGIC SYMBOL AND LOGIC DIAGRAM June 2000 1/12 ST75185 ORDER CODES T ype T emp eratu re Range Package Comments ST75185CN 0 to 70 oC DIP-20 20 parts per tube / 50 tubes per box ST75185CD 0 to 70 oC SO-20 (Tube) 40 parts per tube / 25 tubes per box ST75185CDR 0 to 70 C SO-20 (Tape & Reel) 1000 parts per reel o PIN DESCRIPTION 2/12 PIN No SYMBOL 1 VDD Supply Voltage (+12V) NAME AND F UNCTIO N 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 FourthReceiver 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 (+5V) ST75185 ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE (unless otherwise specified) Symbol Value Unit VDD Supply Voltage (Note 1) Parameter 15 V VSS Supply Voltage (Note 1) -15 V VCC Supply Voltage (Note 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 Tstg Storage Temperature Range 0 to 70 o -65 to +150 o 260 o Lead Temperature 1.6mm from case for 10 sec TL C C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. NOTE1:All voltage are with respect to the network ground terminal. DISSIPATION RATING TABLE Packag e Po wer Rating at TA ≤ 25 o C Derating Factor above TA = 25 oC (*) Po wer Rating at TA ≤ 70 o C MICROPACKAGE (D) 1125 mW 9.0 mW/oC 720 mW DIP (N) 1150 mW 9.2 mW/oC 736 mW (*) This is the reverse of the traditional junction-case thermal resistance RtJ-C 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 VIN Driver Input Voltege 0 VCC V IOH High Level Output Current -6 mA IOL Low Level Output Current TA Operating Free-Air Temperature DRIVER RECEIVER -0.5 DRIVER 6 RECEIVER mA 16 0 70 o C 3/12 ST75185 SUPPLY CURRENTS Symb ol Parameter Test Con dition s VDD IDD ISS ICC Supply Current from VDD Supply Current from VSS Supply Current from VCC 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 Value Min . T yp. Un it Max. No load. All inputs at 1.9V 15 No load. All inputs at 0.8V 4.5 No load. All inputs at 1.9V -15 No load. All inputs at 0.8V -3.2 19 mA 25 mA 5.5 9 -19 mA -25 mA -3.2 -3.2 30 No load. All inputs at 5V VCC = 5V mA DRIVER ELECTRICAL CHARACTERISTICS OVER OPERATING FREE-AIR TEMPERATURE RANGE (VDD = 9V, VSS = -9V, VCC = 5V, unless otherwise specified) Symb ol Parameter Test Con dition s VOH High Level Output Voltage VIL = 0.8 V R L = 3KΩ (See Figure 1) VOL Low Level Output Voltage (Note 3) VIH = 1.9 V R L = 3KΩ (See Figure 1) IIH High Level Input Current VI = 5 V (See Figure 2) IIL Value Min . T yp. 6 7.5 -7.5 Un it Max. V -6 V 10 µA Low Level Input Current VI = 0 V (See Figure 2) -1.6 mA IOS(H) High Level Short Circuit Output Current (Note 4) VIL = 0.8 V VO = 0 V (See Figure 1) -4.5 -12 -19.5 mA IOS(L) Low Level Short Circuit Output Current VIH = 2 V V O = 0 V (See Figure 1) 4.5 12 19.5 mA Output Resistance VDD = VSS = VCC = 0 V VO = -2 to 2 V (Note 5) 300 RO Ω NOTE 3: The algebraic convention, where the more positive (less negative) limitis designated as maximum, is used in this datasheet for logic levels only (e.g. if -10V is a maximum, the typical value is a more negative voltage). NOTE 4: Output short circuit conditions must mantain the total power dissipation below absolute maximum ratings. NOTE 5: Testconditions are those specified by EIA-232-E and as listed above. 4/12 ST75185 DRIVER SWITCHING CHARACTERISTICS (VDD = 12V, VSS = -12V, VCC = 5V TA = 25 oC) Symb ol Parameter Test Con dition s Value Min . Un it T yp. Max. tPLH Propagation Delay Time, Low to High Level Output R L = 3 to 7 KΩ CL = 15 pF (See Figures 3, 4) 315 500 tPHL Propagation Delay Time High to Low Level Output R L = 3 to 7 KΩ CL = 15 pF (See Figures 3, 4) 75 175 ns tTLH Transition Time Low to High Level Output R L = 3 to 7 KΩ CL = 15 pF (See Figures 3, 4) 60 100 ns R L = 3 to 7 KΩ CL = 2500 pF (Note 6, See Figure 3, 4) 1.7 2.5 µs R L = 3 to 7 KΩ CL = 15 pF (See Figure 3, 4) 40 7.5 ns R L = 3 to 7 KΩ CL = 2500 pF (Note 6, See Figure 3, 4) 1.5 2.5 µs tTHL Transition Time High to Low Level Output ns NOTE 6: Measured between -3V and 3V points of output waveform (EIA-232-E conditions), all unused inputs are tied. RECEIVER ELECTRICAL CHARACTERISTICS OVER OPERATING CONDITIONS Symb ol Parameter Test Con dition s VT+ Positive Going Threshold Voltage (See Figure 6) VT- Negative Going Threshold Voltage TA = 25 oC (See Figure 6) Vhys Input Hysteresis (VT+ - VT-) VOH High Level Output Voltage VOL IIH IIL IOS Value T yp. Max. 2.2 2.4 0.75 0.97 V IH = 0.75 V 2.6 Inputs Open 2.6 VI = 3 V High Level Input Current VI = 25 V (See Figure 6) 3.6 VI = 3 V (See Figure 6) 0.43 Short-Circuit Output Current IOL = 10 mA VI = -25 V (See Figure 6) -3.6 VI = -3 V (See Figure 6) -0.43 VI = 0 V VO = 0 V (See Figure 5) V V 0.5 IOH = -0.5mA Low Level Output Voltage Low Level Input Current Un it Min . V 4 5 0.2 0.45 V 8.3 mA -8.3 mA -12 mA -3.4 V Alltypical values are at TA = 25 oC, VCC = 5V, VDD = 9Vand VSS = -9V RECEIVER SWITCHING CHARACTERISTICS (VDD = 12V, VSS = -12V, VCC = 5V TA = 25 oC) Symbo l Parameter T est Cond ition s Value Min. Unit Typ . Max. tPLH Propagation Delay Time, Low to High Level Output R L = 5 KΩ CL = 50 pF (See Figure 6) 400 1000 tPHL Propagation Delay Time High to Low Level Output R L = 5 KΩ CL = 50 pF (See Figure 6) 70 150 ns tTLH Transition Time Low to High Level Output R L = 5 KΩ CL = 50 pF (See Figure 6) 200 525 ns tTHL Transition Time High to Low Level Output R L = 5 KΩ CL = 50 pF (See Figure 6) 20 60 ns ns 5/12 ST75185 APPLICATION CIRCUITS TTL LEVEL RS232 LEVEL Vdd +12 V Vcc +5 V ST75185 100nF 100nF Vcc Vdd 1 20 DCD UART (16550) 38 19 DSR 37 18 RXD 21 17 RTS TXD CTS DTR RI 32 11 36 33 39 Rout1 Rout2 Rin1 DCD 6 3 DSR Rout3 Ri n3 Din1 Dout1 Di n2 Dout2 2 4 RXD 7 5 16 CL RTS 6 15 Rin4 Din3 Dout3 Rout5 Rin5 8 7 CTS 8 13 CL 4 DTR 9 9 12 GND PC Serial Port 3 TXD CL Rout4 14 11 1 2 Ri n2 RI Vss 5 10 100nF Vss -12V GND Dib9 Serial Port Connector To CPU FIGURE 1: Driver Test Circuit for VOH, VOL, ISO(H) and ISO(L) 6/12 FIGURE 2: Driver Test Circuitfor IIH and IIL ST75185 FIGURE 3:Driver Test Circuit FIGURE 4: Driver Voltage Waveforms FIGURE 5: Receiver Test Circuit for IOS FIGURE 6: Receiver Test Circuit for VT, VOH, VOL FIGURE 7: Receiver Test Circuit FIGURE 8: Receiver Voltage Waveforms NOTE A: The pulse generator has the following characteristics: tW = 25 µs,PRR = 20 KHz, ZO = 50 Ω, tr = tf < 50ns. NOTE B: CL includes probe and jig capacitance. 7/12 ST75185 Driver Voltage Transfer Characteristics Driver Output Current vs Output Voltage Driver Short Circuit Output Current vs Free-Air Temperature Driver Output Slew Rate vs Load Capacitance Device Supply Current vs Temperature Receiver Threshold vs Temperature 8/12 ST75185 Receiver Threshold vs Supply Voltage APPLICATION INFORMATION: DIODES ON POWER SUPPLY Diodes placed in series with the VDD and VSS leads protect the ST75185 in the fault condition in which the devices output are shorted to ±15V and the power supplies are at low state and provide low-impedance path to ground (see Figure below) +VDD Output ST75185 Output shorted to ±15V Output ST75185 -VSS Low impedance in the power off condition. 9/12 ST75185 Plastic DIP-20 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.254 B 1.39 TYP. inch MAX. MIN. TYP. MAX. 0.010 1.65 0.055 0.065 b 0.45 0.018 b1 0.25 0.010 D 25.4 1.000 E 8.5 0.335 e 2.54 0.100 e3 22.86 0.900 F 7.1 0.280 I 3.93 0.155 L Z 3.3 0.130 1.34 0.053 P001J 10/12 ST75185 SO-20 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 2.65 0.10 0.104 0.20 a2 MAX. 0.004 0.007 2.45 0.096 b 0.35 0.49 0.013 0.019 b1 0.23 0.32 0.009 0.012 C 0.50 0.020 c1 45 (typ.) D 12.60 13.00 0.496 0.512 E 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 11.43 0.450 F 7.40 7.60 0.291 0.299 L 0.50 1.27 0.19 0.050 M S 0.75 0.029 8 (max.) P013L 11/12 ST75185 Information furnished is believed to be accurate and reliable. However, STMicroelectronic s assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems withoutexpress written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com . 12/12