DS96176_15 TI1 | Alldatasheet
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DS96176 RS-485/RS-422 Differential Bus Transceiver Literature Number: SNLS393A Not Recommended For New Designs
RS-485/RS-422 Differential Bus Transceiver General Description The DS96176 Differential Bus Transceiver is a monolithic integrated circuit designed for bidirectional data communica- tion on balanced multipoint bus transmission lines. The transceiver meets EIA Standard RS-485 as well as RS-422A. The DS96176 combines a TRI-STATE ® differential line driver and a differential input line receiver, both of which operate from a single 5.0V power supply. The driver and receiver have an active Enable that can be externally connected to function as a direction control. The driver differential outputs and the receiver differential inputs are internally connected to form differential input/output (I/O) bus ports that are de- signed to offer minimum loading to the bus whenever the driver is disabled or when V CC = 0V. These ports feature wide positive and negative common mode voltage ranges, making the device suitable for multipoint applications in noisy environments. The driver is designed to handle loads up to 60 mA of sink or source current. The driver features positive and negative current-limiting and thermal shutdown for protection from line fault conditions. Thermal shutdown is designed to occur at junction temperature of approximately 160˚C. The receiver features a typical input impedance of 15 kΩ, an input sensi- tivity of ±200 mV, and a typical input hysteresis of 50 mV. The DS96176 can be used in transmission line applications employing the DS96172 and the DS96174 quad differential line drivers and the DS96173 and DS96175 quad differential line receivers.
Features
n Bidirectional transceiver n Meets EIA Standard RS-422A and RS-485 n Designed for multipoint transmission n TRI-STATE driver and receiver enables n Individual driver and receiver enables n Wide positive and negative input/output bus voltage ranges n Driver output capability ±60 mA Maximum n Thermal shutdown protection n Driver positive and Negative current-limiting n High impedance receiver input 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 Driver Input Enable Outputs DI DE A B HH H L LH L H XL Z Z Receiver Differential Inputs Enable Output A-B RE R VID ≥ 0.2V L H VID ≤ −0.2V L L XH Z H = High Level L = Low Level X = Immaterial Z = High Impedance (off) TRI-STATE® is a registered trademark of National Semiconductor Corporation. 8–Lead DIP DS009630-1 Top View Order Number DS96176CN See NS Package Number N08E May 1998 DS96176 RS-485/RS-422 Differential Bus Transceiver © 2001 National Semiconductor Corporation DS009630 www.national.com Not Recommended For New Designs
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 Molded DIP −65˚C to +150˚C Lead Temperature Molded DIP (soldering, 10 sec.) 265˚C Maximum Power Dissipation (Note 1) at 25˚C Molded Package 930 mW Supply Voltage 7.0V Differential Input Voltage +15V/−10V Enable 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 Mode) −7.0 12 V Differential Input Voltage (VID) ±12 V Output Current HIGH (IOH ) Driver −60 mA Receiver −400 µA Output Current LOW (IOL ) Driver 60 mA Receiver 16 mA 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 VIH Input Voltage HIGH 2.0 V VIL Input Voltage LOW 0.8 V VOH Output Voltage HIGH IOH = −20 mA 3.1 V VOL Output Voltage LOW IOL = 20 mA 0.85 V VIC Input Clamp Voltage II = −18 mA −1.5 V |VOD1 | Differential Output Voltage IO = 0 mA 6.0 V |VOD2 | Differential Output Voltage R L = 100Ω, Figure 1 2.0 2.25 V R L =5 4Ω ,Figure 1and Figure 2 1.5 2.0 Δ|VOD2 | Change in Magnitude of R L =5 4Ω Differential Output Voltage (Note 5) VCM =0 V Figure 1and Figure 2 ±0.2 V R L = 100Ω Figure 1 VOC Common Mode Output Voltage (Note 6) RL =5 4Ω or 100Ω,Figure 1 3.0 V Δ|VOC | Change in Magnitude of ±0.2 V Common Mode Output Voltage (Note 5) IO Output Current (Note 5) Output Disabled VO = 12V 1.0 mA (Includes Receiver II)V O = −7.0V −0.8 IIH Input Current HIGH VI = 2.4V 20 µA IIL Input Current LOW VI = 0.4V −100 µA IOS Short Circuit Output Current VO = −7.0V −250 (Note 10) VO = 0V −150 mA VO =V CC 150 VO = 12V 250 ICC Supply Current No Load Outputs Enabled 35 mA Outputs Disabled 40 RECEIVER SECTION V TH Differential Input High VO = 2.7V, IO = −0.4 mA 0.2 V Threshold Voltage VTL Differential Input Low VO = 0.5V, IO = 8.0 mA −0.2 V Threshold Voltage (Note 7) VT+ −V T− Hysteresis (Note 8) VCM =0 V 5 0 m V VIH Enable Input Voltage HIGH 2.0 V VIL Enable Input Voltage LOW 0.8 V VIC Enable Input Clamp Voltage II = −18 mA −1.5 V DS96176 www.national.com 2 Not Recommended For New Designs
Typical Performance Characteristics Driver Differential Propagation Delay vs VCC vs Temperature DS009630-22 Driver Differential Propagation Delay vs V CC vs Temperature DS009630-23 Driver Differential Rise Time vs V CC vs Temperature DS009630-24 Driver Differential Fall Time vs V CC vs Temperature DS009630-25 Driver Skew vs VCC vs Temperature (|tPLDH –tPHLD |) DS009630-26 DS96176 www.national.com7 Not Recommended For New Designs
FIGURE 15. Typical Curve Receiver Propagation Delay Timing
Physical Dimensionsinches (millimeters) unless otherwise noted 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. National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com Molded Dual-In-Line Package (N) Order Number DS96176CN DS96176 RS-485/RS-422 Differential Bus Transceiver 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. Not Recommended For New Designs
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