DS96177

DS96177 NSC | Alldatasheet

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n Meets EIA Standard RS-422A and RS-485 n Designed for multipoint transmission on long bus lines in noisy environments n TRI-STATE outputs n Bus voltage range −7.0V to +12V n Positive and negative current limiting n Driver output capability±60 mA max n Driver thermal shutdown protection n Receiver input high impedance n Receiver input sensitivity of±200 mV n Receiver input hysteresis of 50 mV typical n Operates from single 5.0V supply n Low power requirements Connection Diagram Function Table Differential Inputs Enable Outputs A – B E TYZ VID ≥ 0.2V H H H L VID ≤ −0.2V H L L H X L ZZZ Note:T is an output pin only, monitoring the BUS (RO). H = High Level L = Low Level X = Immaterial Z = High Impedance (off) TRI-STATE® is a registered trademark of National Semiconductor Corporation. 8-Lead Dual-In-Line Package DS009644-1 Top View Order Number DS96177CN See NS Package Number N08E October 1993 DS96177 RS-485/RS-422 Differential Bus Repeater © 1999 National Semiconductor Corporation DS009644 www.national.com

Absolute Maximum Ratings(Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Ceramic DIP −65˚C to +175˚C Molded DIP −65˚C to +150˚C Lead Temperature Ceramic DIP (Soldering, 60 sec.) 300˚C Molded DIP (Soldering, 10 sec.) 265˚C Maximum Power Dissipation (Note 1) at 25˚C Molded Package 930 mW Supply Voltage 7.0V Input Voltage 5.5V Recommended Operating Conditions Min Typ Max Units Supply Voltage (VCC ) 4.75 5.0 5.25 V Voltage at any Bus Terminal (Separately or Common −7.0 12 V Mode) (V I or VCM ) Differential Input Voltage (VID) ±12 V Output Current HIGH (IOH ) Driver −60 mA Receiver −400 µA Output Current LOW (I OL ) Driver 60 mA Receiver 16 Operating Temperature (T A) 0 25 70 ˚C Note 1:Derate molded DIP package 7.5 mW/˚C above 25˚C. Electrical Characteristics(Notes 3, 4) Over recommended temperature, common mode input voltage, and supply voltage ranges, unless otherwise specified Symbol Parameter Conditions Min Typ Max Units DRIVER SECTION V IH Input Voltage HIGH 2.0 V VIL Input Voltage LOW 0.8 V VIC Input Clamp Voltage I I = −18 mA −1.5 V |VOD1 | Differential Output Voltage I O = 0 mA 6.0 V |VOD2 | Differential Output Voltage R L = 100Ω ,Figure 1 2.0 2.25 V R L = 54Ω ,Figure 1and Figure 2 1.5 2.0 Δ|VOD2 | Change in Magnitude of Differential R L = 100Ω ,Figure 1 ±0.2 V Output Voltage (Note 5) R L = 54Ω Figure 1 and Figure 2 VCM = 0V VOC Common Mode Output Voltage (Note 6) R L = 54Ω or 100Ω 3.0 V Δ|VOC | Change in Magnitude of Common Mode Figure 1 ±0.2 V Output Voltage (Note 5) IO Output Current with Power Off V CC = 0V, VO = −7.0V to +12V ±100 µA IOZ High Impedance State Output Current V O = −7.0V to +12V ±50 ±200 µA IIH Input Current HIGH V I = 2.7V 20 µA IIL Input Current LOW V I = 0.5V −100 µA IOS Short Circuit Output Current V O = −7.0V −250 (Note 10) V O = 0V −150 mA VO = VCC 150 VO = 12V 250 ICC Supply Current No Load Outputs Enabled 35 mA Outputs Disabled 40 RECEIVER SECTION V TH Differential Input V O = 2.7V, IO = −0.4 mA 0.2 V High Threshold Voltage VTL Differential Input Low V O = 0.5V, IO = 8.0 mA −0.2 V Threshold Voltage (Note 7) VT+−V T− Hysteresis (Note 8) V CM = 0V 50 mV VIH Enable Input Voltage HIGH 2.0 V VIL Enable Input Voltage LOW 0.8 V www.national.com 2

Electrical Characteristics(Notes 3, 4) (Continued) Over recommended temperature, common mode input voltage, and supply voltage ranges, unless otherwise specified Symbol Parameter Conditions Min Typ Max Units RECEIVER SECTION V IC Enable Input Clamp Voltage I I = −18 mA −1.5 V VOH High Level Output Voltage V ID = 200 mV, IOH = −400 µA,Figure 3 2.7 V VOL Low Level Output Voltage V ID = −200 mV, I OL = 8.0 mA 0.45 V Figure 3 IOL = 16 mA 0.50 IOZ High-Impedance State Output V O = 0.4V −360 µA VO = 2.4V 20 II Line Input Current (Note 9) Other Input = 0V V I = 12V 1.0 mA VI = −7.0V −0.8 IIH Enable Input Current HIGH V IH = 2.7V 20 µA IIL Enable Input Current LOW V IL = 0.4V −100 µA R I Input Resistance 12 k Ω IOS Short Circuit Output Current (Note 10) −15 −85 mA ICC Supply Current (Total Package) No Load Outputs Enabled 35 mA Outputs Disabled 40 Drive Switching Characteristics VCC = 5.0V, TA = 25˚C Symbol Parameter Conditions Min Typ Max Units tDD Differential Output Delay Time R L = 60Ω ,Figure 4 15 25 ns tTD Differential Output Transition Time RL = 60Ω ,Figure 4 15 25 ns tPLH Propagation Delay Time, R L = 27Ω ,Figure 5 12 20 ns Low-to-High Level Output tPHL Propagation Delay Time, R L = 27Ω ,Figure 5 12 20 ns High-to-Low Level Output tPZH Output Enable Time to High Level R L = 110Ω ,Figure 6 25 45 ns tPZL Output Enable Time to Low Level R L = 110Ω ,Figure 7 25 40 ns tPHZ Output Disable Time from High Level RL = 110Ω ,Figure 6 20 25 ns tPLZ Output Disable Time from Low Level RL = 110Ω ,Figure 7 29 35 ns Receiver Switching Characteristics VCC = 5.0V, TA = 25˚C Symbol Parameter Conditions Min Typ Max Units tPLH Propagation Delay Time, V ID = 0V to 3.0V, 16 25 ns Low-to-High Level Output C L = 15 pF,Figure 8 tPHL Propagation Delay Time, 16 25 ns High-to-Low Level Output tPZH Output Enable Time to High Level C L = 15 pF,Figure 9 15 22 ns tPZL Output Enable Time to Low Level 15 22 ns tPHZ Output Disable Time from High Level C L = 5.0 pF,Figure 9 14 30 ns tPLZ Output Disable Time from Low Level 24 40 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 DS96177. 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:Δ|VOD | andΔ|VOC | are the changes in magnitude of VOD ,V OC 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:The algebraic convention, when the less positive (more negative) limit is designated minimum, is used in this data sheet for common mode input voltage and threshold voltage levels only. www.national.com3

Note 11:The input pulse is supplied by a generator having the following characteristics: PRR= 1.0 MHz, duty cycle≈ 50% ,tr ≤ 6.0 ns, tf≤ 6.0 ns, ZO = 50Ω . Note 12:C L includes probe and stray capacitance. Note 13:DS96177 Enable is active high. Note 14:All diodes are 1N916 or equivalent. FIGURE 9. Receiver Enable and Disable Times

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. Repeater control logic not shown FIGURE 10. www.national.com7

Physical Dimensionsinches (millimeters) unless otherwise noted LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or sys- tems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose fail- ure 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 rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 Molded Dual-In-Line Package (N) Order Number DS96177CN DS96177 RS-485/RS-422 Differential Bus Repeater National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.