DS26LS31C/DS26LS31M Quad High Speed Differential Line Driver General Description Features The DS26LS31 is a quad differential line driver designed for digital data transmission over balanced lines. The DS26LS31 meets all the requirements of EIA Standard RS422 and Federal Standard 1020. It is designed to provide unipolar differential drive to twisted-pair or parallel-wire transmission lines. n n n n n The circuit provides an enable and disable function common to all four drivers. The DS26LS31 features TRI-STATE ® outputs and logically ANDed complementary outputs. The inputs are all LS compatible and are all one unit load. n n n n n Output skew — 2.0 ns typical Input to output delay — 10 ns typical Operation from single 5V supply Outputs won’t load line when VCC = 0V Four line drivers in one package for maximum package density Output short-circuit protection Complementary outputs Meets the requirements of EIA Standard RS-422 Pin compatible with AM26LS31 Available in military and commercial temperature range Logic and Connection Diagrams 00577801 Dual-In-Line Package 00577802 Top View Order Number DS26LS31CM, or DS26LS31CN See NS Package M16A or N16E For Complete Military Product Specifications, refer to the appropriate SMD or MDS. Order Number DS26LS31MJ/883, DS26LS31ME/883 or DS26LS31MW/883 See NS Package E20A, J16A or W16A TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS005778 www.national.com DS26LS31C/DS26LS31M Quad High Speed Differential Line Driver June 1998 DS26LS31C/DS26LS31M Absolute Maximum Ratings (Note 2) Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 7V Input Voltage 7V Output Voltage Molded DIP Package 1476 mW SO Package 1051 mW DS26LS31M 4.5 5.5 V DS26LS31 4.75 5.25 V −55 +125 ˚C 0 +70 ˚C DS26LS31 Maximum Power Dissipation (Note 1) at 25˚C 1509 mW Units DS26LS31M −0.25 to 6V Cavity Package Max Temperature, TA 5.5V Output Voltage (Power OFF) Min Supply Voltage, VCC Note 1: Derate cavity package 10.1 mW/˚C above 25˚C; derate molded DIP package 11.9 mW/˚C above 25˚C; derate SO package 8.41 mW/˚C above 25˚C. Electrical Characteristics (Notes 3, 4, 5) Symbol Parameter Conditions Min Typ Max Units VOH Output High Voltage IOH = −20 mA VOL Output Low Voltage IOL = 20 mA VIH Input High Voltage VIL Input Low Voltage IIL Input Low Current VIN = 0.4V IIH Input High Current VIN = 2.7V 20 µA II Input Reverse Current VIN = 7V 0.1 mA IO TRI-STATE Output Current VO = 2.5V 20 µA VO = 0.5V −20 µA VCL Input Clamp Voltage ISC Output Short-Circuit Current ICC Power Supply Current 2.5 V 0.5 2.0 V V −40 IIN = −18 mA −30 All Outputs Disabled 0.8 V −200 µA −1.5 V −150 mA 60 mA 35 or Active Switching Characteristics VCC = 5V, TA = 25˚C Typ Max Units tPLH Symbol Input to Output Parameter CL = 30 pF Conditions Min 10 15 ns tPHL Input to Output CL = 30 pF 10 15 ns Skew Output to Output CL = 30 pF 2.0 6.0 ns tLZ Enable to Output CL = 10 pF, S2 Open 15 35 ns tHZ Enable to Output CL = 10 pF, S1 Open 15 25 ns tZL Enable to Output CL = 30 pF, S2 Open 20 30 ns tZH Enable to Output CL = 30 pF, S1 Open 20 30 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 −55˚C to +125˚C temperature range for the DS726LS31M and across the 0˚C to +70˚C range for the DS26LS31. All typicals are given for V CC = 5V and TA = 25˚C. Note 4: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified. Note 5: Only one output at a time should be shorted. www.national.com 2 DS26LS31C/DS26LS31M AC Test Circuit and Switching Time Waveforms 00577803 S1 and S2 of load circuit are closed except where shown. FIGURE 1. AC Test Circuit 00577804 f = 1 MHz, tr ≤ 15 ns, tf ≤ 6 ns FIGURE 2. Propagation Delays 00577805 f = 1 MHz, tr ≤ 15 ns, tf ≤ 6 ns FIGURE 3. Enable and Disable Times 3 www.national.com DS26LS31C/DS26LS31M Typical Applications Two-Wire Balanced System, RS-422 00577806 Note 6: RT is optional although highly recommended to reduce reflection. Typical Performance Characteristics DS26LS31CN Unloaded IC vs Frequency vs TA DS26LS31 ICC vs VCC vs TA 00577807 00577808 DS26LS31CN VOH vs IOH vs TA DS26LS31CN VOL vs IOL vs TA 00577810 00577809 www.national.com 4 DS26LS31C/DS26LS31M Typical Performance Characteristics (Continued) DS26LS31CN VOD vs IO vs TA 00577811 5 www.national.com DS26LS31C/DS26LS31M Physical Dimensions inches (millimeters) unless otherwise noted Small Outline Package (M) Order Number DS26LS31CM NS Package Number M16A Molded Dual-In-Line Package (N) Order Number DS26LS31CN NS Package Number N16E www.national.com 6 DS26LS31C/DS26LS31M Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16 Lead Ceramic Flatpak (F) Order Number DS26LS31MW/883 NS Package Number W16A 16 Lead Ceramic Dual-in-Line Package (J) Order Number DS26LS31MJ/883 NS Package Number J16A 7 www.national.com DS26LS31C/DS26LS31M Quad High Speed Differential Line Driver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20 Lead Ceramic Leadless Chip Carrier (E) Order Number DS26LS31MJE/883 NS Package Number E20A 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. 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