DS96172/DS96174 RS-485/RS-422 Quad Differential Line Drivers General Description Features The DS96172 and DS96174 are high speed quad differential line drivers designed to meet EIA Standard RS-485. The devices have TRI-STATE ® outputs and are optimized for balanced multipoint data bus transmission at rates up to 10 Mbps. The drivers have wide positive and negative common mode range for multipoint applications in noisy environments. Positive and negative current-limiting is provided which protects the drivers from line fault conditions over a +12V to −7.0V common mode range. A thermal shutdown feature is also provided and occurs at junction temperature of approximately 160˚C. The DS96172 features an active high and active low Enable, common to all four drivers. The DS96174 features separate active high Enables for each driver pair. Compatible RS-485 receivers, transceivers, and repeaters are also offered to provide optimum bus performance. The respective device types are DS96173, DS96175, DS96176 AND DS96177. n n n n n n n n n Meets EIA Standard RS-485 and RS-422A Monotonic differential output switching Transmission rate to 10 Mbs TRI-STATE outputs Designed for multipoint bus transmission Common mode output voltage range: −7V to +12V Operates from single +5V supply Thermal shutdown protection DS96172/DS96174 are lead and function compatible with the SN75172/75174 or the AM26LS31/MC3487 respectively Connection Diagrams 16-Lead DIP DS96172 16-Lead DIP DS96174 DS009626-1 Top View DS009626-2 Top View Order Number DS96172CN or DS96174CN See NS Package Number N16E TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS009626 www.national.com DS96172/DS96174 RS-485/RS-422 Quad Differential Line Drivers June 1998 Absolute Maximum Ratings (Note 2) N-Molded Package If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Molded DIP Operating Temperature Range Lead Temperature Molded DIP (soldering, 10 sec.) Supply Voltage Enable Input Voltage Maximum Power Dissipation (Note 1) 1.98W Recommended Operating Conditions −65˚C to +150˚C 0˚C to +70˚C Supply Voltage (VCC) Common Mode Output Voltage (VOC) Output Current HIGH (IOH) Output Current LOW (IOL) Operating Temperature (TA) 265˚C 7V 5.5V Min 4.75 Typ 5 Max 5.25 Units V 25 +12 −60 60 70 V mA mA ˚C −7 0 Note 1: Derate molded DIP package 16mW/˚C above 25˚C. 25˚C Electrical Characteristics (Notes 3, 4) over recommended temperature and supply voltage ranges, unless otherwise specified Symbol Parameter VIH Input Voltage HIGH VIL Input Voltage LOW Conditions Min Typ Max Units 0.8 V 2 V VOH Output Voltage HIGH IOH = −20 mA 3.1 V VOL Output Voltage LOW IOL = 20 mA 0.8 V VIC Input Clamp Voltage II = −18 mA |VOD1| Differential Output Voltage IO = 0 mA |VOD2| Differential Output Voltage ∆|VOD| Change in Magnitude of Differential −1.5 V 6 V RL = 54Ω, Figure 1 1.5 2 V RL = 100Ω, Figure 1 2 2.3 V RL = 54Ω or 100Ω, Figure 1 ± 0.2 V Output Voltage (Note 5) VOC Common Mode Output Voltage (Note 6) ∆|VOC| Change in Magnitude of Common Mode RL = 54Ω, Figure 1 3 V ± 0.2 V ± 100 ± 200 µA Output Voltage (Note 5) IO Output Current with Power Off VCC = 0V, VO = −7.0V to 12V IOZ High Impedance State Output Current VO = −7.0V to 12V IIH Input Current HIGH VI = 2.7V 20 µA IIL Input Current LOW VI = 0.5V −100 µA IOS Short Circuit Output Current VO = −7.0V −250 (Note 7) VO = 0V −150 VO = VCC 150 ± 50 VO = 12V ICC Supply Current (All Drivers) No Load µA mA 250 Outputs Enabled 50 70 Output Disabled 50 60 mA Switching Characteristics VCC = 5V, TA = 25˚C Symbol Parameter tDD Differential Output Delay Time tTD Differential Output Transition Time tPLH Propagation Delay Time, Conditions RL = 60Ω, Figure 2 RL = 27Ω, Figure 3 Min Typ Max Units 15 25 ns 15 25 ns 12 20 ns 12 20 ns Low-to-High Level Output tPHL Propagation Delay Time, High-to-Low Level Output tPZH Output Enable Time to High Level RL = 110Ω, Figure 4 30 45 ns tPZL Output Enable Time to Low Level RL = 110Ω, Figure 5 30 45 ns www.national.com 2 Switching Characteristics (Continued) VCC = 5V, TA = 25˚C Typ Max Units tPHZ Symbol Output Disable Time from High Level Parameter RL = 110Ω, Figure 4 Conditions Min 25 35 ns tPLZ Output Disable Time from Low Level RL = 110Ω, Figure 5 30 45 ns Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation. Note 3: Unless otherwise specified min/max limits apply across the 0˚C to +70˚C range for the DS96172/DS96174. All typicals are given for VCC = 5V and TA = 25˚C. Note 4: All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground unless otherwise specified. Note 5: ∆ |VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC respectively, that occur when the input is changed from a high level to a low level. Note 6: In EIA Standards RS-422A and RS-485, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS. Note 7: Only one output at a time should be shorted. Parameter Measurement Information DS009626-4 FIGURE 1. Differential and Common Mode Output Voltage DS009626-5 DS009626-6 FIGURE 2. Differential Output Delay and Transition Times DS009626-7 DS009626-8 FIGURE 3. Propagation Delay Times 3 www.national.com Parameter Measurement Information (Continued) DS009626-10 DS009626-9 FIGURE 4. tPZH and tPHZ DS009626-12 DS009626-11 FIGURE 5. tPZL and tPLZ Note 8: The input pulse is supplied by a generator having the following characteristics: PRR = 1.0 MHz, duty cycle = 50%, tr ≤ 5.0 ns, tf ≤ 5.0 ns, ZO = 50Ω. Note 9: CL includes probe and jig capacitance. Note 10: DS96172 with active high and active low Enables is shown here. DS96174 has active high Enable only. Note 11: To test the active low Enable E of DS96172, ground E and apply an inverted waveform to E . DS96174 has active high Enable only. Function Tables DS96174 DS96172 Input Enables Outputs Input Enable Outputs A E E Y Z H H X H L H H H L L H X L H L H L H H X L H L X L Z Z L X L L H X L H Z Z www.national.com Y H = High Level X = Immaterial L = Low Level Z = High Impedance (off) 4 Z Typical Application DS009626-13 Note: The line length should be terminated at both ends in its characteristic impedance. Stub lengths off the main line should be kept as short as possible. FIGURE 6. 5 www.national.com DS96172/DS96174 RS-485/RS-422 Quad Differential Line Drivers Physical Dimensions inches (millimeters) unless otherwise noted Molded Dual-In-Line Package (N) Order Number DS96172CN or DS96174CN NS Package Number N16E 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. 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