DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers General Description Features The DS75176B is a high speed differential TRI-STATE ® bus/line transceiver designed to meet the requirements of EIA standard RS485 with extended common mode range (+12V to −7V), for multipoint data transmission. In addition, it is compatible with RS-422. The driver and receiver outputs feature TRI-STATE capability, for the driver outputs over the entire common mode range of +12V to −7V. Bus contention or fault situations that cause excessive power dissipation within the device are handled by a thermal shutdown circuit, which forces the driver outputs into the high impedance state. n Meets EIA standard RS485 for multipoint bus transmission and is compatible with RS-422. n Small Outline (SO) Package option available for minimum board space. n 22 ns driver propagation delays. n Single +5V supply. n −7V to +12V bus common mode range permits ± 7V ground difference between devices on the bus. n Thermal shutdown protection. n High impedance to bus with driver in TRI-STATE or with power off, over the entire common mode range allows the unused devices on the bus to be powered down. n Pin out compatible with DS3695/A and SN75176A/B. n Combined impedance of a driver output and receiver input is less than one RS485 unit load, allowing up to 32 transceivers on the bus. n 70 mV typical receiver hysteresis. DC specifications are guaranteed over the 0 to 70˚C temperature and 4.75V to 5.25V supply voltage range. Connection and Logic Diagram 00875901 Top View Order Number DS75176BN, DS75176BTN, DS75176BM or DS75176BTM See NS Package Number N08E or M08A TRI-STATE ® is a registered trademark of National Semiconductor Corp. © 2004 National Semiconductor Corporation DS008759 www.national.com DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers July 2004 DS75176B/DS75176BT Absolute Maximum Ratings (Note 1) ESD Rating (HBM) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage, VCC 7V Control Input Voltages 7V Driver Input Voltage 7V Driver Output Voltages +15V/ −10V Receiver Input Voltages (DS75176B) +15V/ −10V Receiver Output Voltage 500V Recommended Operating Conditions Min Supply Voltage, VCC Voltage at Any Bus Terminal +12 V (Separate or Common Mode) DS75176B Continuous Power Dissipation @ 25˚C DS75176BT 675 mW (Note 5) for N Package 900 mW (Note 4) Storage Temperature Range V −7 Operating Free Air Temperature TA 5.5V for M Package Max Units 4.75 5.25 0 +70 ˚C −40 +85 ˚C −12 +12 V Differential Input Voltage, VID (Note 6) −65˚C to +150˚C Lead Temperature (Soldering, 4 seconds) 260˚C Electrical Characteristics (Notes 2, 3) 0˚C ≤ TA≤ 70˚C, 4.75V < VCC < 5.25V unless otherwise specified Symbol VOD1 Parameter Conditions Differential Driver Output Min Typ Max Units IO = 0 5 V Voltage (Unloaded) VOD2 Differential Driver Output (Figure 1) R = 50Ω; (RS-422) (Note 7) Voltage (with Load) ∆VOD R = 27Ω; (RS-485) 2 V 1.5 V Change in Magnitude of Driver Differential Output Voltage For 0.2 V 3.0 V 0.2 V Complementary Output States VOC Driver Common Mode Output ∆|VOC| Change in Magnitude of Driver (Figure 1) R = 27Ω Voltage Common Mode Output Voltage For Complementary Output States VIH Input High Voltage VIL Input Low Voltage DI, DE, VCL Input Clamp Voltage RE , E IIL IIH IIN VTH 2 V 0.8 IIN = −18 mA −1.5 Input Low Current VIL = 0.4V −200 µA Input High Current VIH = 2.4V 20 µA VCC = 0V or 5.25V VIN = 12V +1.0 mA Current Input DO/RI, DO/RI DE = 0V VIN = −7V −0.8 mA Differential Input Threshold −7V ≤ VCM ≤ + 12V +0.2 V −0.2 Voltage for Receiver ∆VTH Receiver Input Hysteresis VCM = 0V VOH Receiver Output High Voltage IOH = −400 µA VOL Output Low Voltage IOZR RO 70 mV 2.7 V IOL = 16 mA (Note 7) 0.5 V ± 20 µA OFF-State (High Impedance) VCC = Max Output Current at Receiver 0.4V ≤ VO ≤ 2.4V RIN Receiver Input Resistance −7V ≤ VCM ≤ +12V ICC Supply Current No Load Driver Outputs Enabled 55 mA (Note 7) Driver Outputs Disabled 35 mA www.national.com 2 12 kΩ (Continued) 0˚C ≤ TA≤ 70˚C, 4.75V < VCC < 5.25V unless otherwise specified Symbol IOSD IOSR Parameter Conditions Min Typ Max Units Driver Short-Circuit VO = −7V (Note 7) −250 mA Output Current VO = +12V (Note 7) +250 mA Receiver Short-Circuit VO = 0V −85 mA −15 Output Current Note 1: “Absolute Maximum Ratings” are those beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 3: All typicals are given for VCC = 5V and TA = 25˚C. Note 4: Derate linearly at 5.56 mW/˚C to 650 mW at 70˚C. Note 5: Derate linearly @ 6.11 mW/˚C to 400 mW at 70˚C. Note 6: Differential - Input/Output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B. Note 7: All worst case parameters for which note 7 is applied, must be increased by 10% for DS75176BT. The other parameters remain valid for −40˚C < TA < +85˚C. Switching Characteristics VCC = 5.0V, TA = 25˚C Symbol Parameter Conditions Min Typ Max Units tPLH Driver Input to Output RLDIFF = 60Ω 12 22 ns tPHL Driver Input to Output CL1 = CL2 = 100 pF 17 22 ns tr Driver Rise Time RLDIFF = 60Ω 18 ns tf Driver Fall Time CL1 =CL2 = 100 pF 18 ns (Figure 3 and Figure 5) tZH Driver Enable to Output High CL = 100 pF (Figure 4 and Figure 6) S1 Open 29 100 ns tZL Driver Enable to Output Low CL = 100 pF (Figure 4 and Figure 6) S2 Open 31 60 ns tLZ Driver Disable Time from Low CL = 15 pF (Figure 4 and Figure 6) S2 Open 13 30 ns tHZ Driver Disable Time from High CL = 15 pF (Figure 4 and Figure 6) S1 Open 19 200 ns tPLH Receiver Input to Output CL = 15 pF (Figure 2 and Figure 7) 30 37 ns tPHL Receiver Input to Output S1 and S2 Closed 32 37 ns tZL Receiver Enable to Output Low CL = 15 pF (Figure 2 and Figure 8) S2 Open 15 20 ns tZH Receiver Enable to Output High CL = 15 pF (Figure 2 and Figure 8) S1 Open 11 20 ns tLZ Receiver Disable from Low CL = 15 pF (Figure 2 and Figure 8) S2 Open 28 32 ns tHZ Receiver Disable from High CL = 15 pF (Figure 2 and Figure 8) S1 Open 13 35 ns 3 www.national.com DS75176B/DS75176BT Electrical Characteristics (Notes 2, 3) DS75176B/DS75176BT AC Test Circuits 00875904 FIGURE 3. 00875902 FIGURE 1. 00875905 Note: Unless otherwise specified the switches are closed. FIGURE 4. 00875903 Note: S1 and S2 of load circuit are closed except as otherwise mentioned. FIGURE 2. Switching Time Waveforms 00875906 FIGURE 5. Driver Propagation Delays and Transition Times www.national.com 4 DS75176B/DS75176BT Switching Time Waveforms (Continued) 00875907 FIGURE 6. Driver Enable and Disable Times 00875908 Note: Differential input voltage may may be realized by grounding RI and pulsing RI between +2.5V and −2.5V FIGURE 7. Receiver Propagation Delays 00875909 FIGURE 8. Receiver Enable and Disable Times 5 www.national.com DS75176B/DS75176BT Function Tables DS75176B Transmitting Inputs Line Outputs RE DE DI Condition DO DO X 1 1 No Fault 0 1 X 1 0 No Fault 1 0 X 0 X X Z Z X 1 X Fault Z Z DS75176B Receiving Inputs Outputs RE DE RI-RI RO 0 0 ≥ +0.2V 1 0 0 ≤ −0.2V 0 0 0 Inputs Open** 1 1 0 X Z X — Don’t care condition Z — High impedance state Fault — Improper line conditons causing excessive power dissipation in the driver, such as shorts or bus contention situations **This is a fail safe condition Typical Application 00875911 www.national.com 6 DS75176B/DS75176BT Physical Dimensions inches (millimeters) unless otherwise noted Lit. # 103669 Molded Dual-In-Line Package (N) Order Number DS75176BN or DS75176BTN NS Package Number N08E 7 www.national.com DS75176B/DS75176BT Multipoint RS-485/RS-422 Transceivers Notes LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. 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