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 RS-422 and Federal Standard 1020. It is designed to provide unipolar differential drive to twisted-pair or parallel-wire transmission lines. The circuit provides an enable and disable function common to all four drivers. The DS26LS31 features TRI-STATE (R) outputs and logically ANDed complementary outputs. The inputs are all LS compatible and are all one unit load. n n n n n 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 DS005778-1 Dual-In-Line Package DS005778-2 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 (R) is a registered trademark of National Semiconductor Corporation. (c) 2000 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 Input Voltage Output Voltage Output Voltage (Power OFF) Maximum Power Dissipation (Note 1) at 25C Cavity Package Molded DIP Package SO Package Supply Voltage, VCC DS26LS31M DS26LS31 Temperature, TA DS26LS31M DS26LS31 7V 7V 5.5V -0.25 to 6V Min Max Units 4.5 4.75 5.5 5.25 V V -55 0 +125 +70 C C Note 1: Derate cavity package 10.1 mW/C above 25C; derate molded DIP package 11.9 mW/C above 25C; derate SO package 8.41 mW/C above 25C. 1509 mW 1476 mW 1051 mW Electrical Characteristics (Notes 3, 4, 5) Symbol Parameter VOH Output High Voltage VOL Output Low Voltage VIH Input High Voltage VIL Input Low Voltage IIL Input Low Current IIH Input High Current II Input Reverse Current IO TRI-STATE Output Current VCL Input Clamp Voltage ISC Output Short-Circuit Current ICC Power Supply Current Conditions IOH = -20 mA IOL = 20 mA Min Typ Max 2.5 Units V 0.5 2.0 V V VIN = 0.4V VIN = 2.7V VIN = 7V -40 VO = 2.5V VO = 0.5V IIN = -18 mA -30 All Outputs Disabled 0.8 V -200 A 20 A 0.1 mA 20 A -20 A -1.5 V -150 mA 60 mA 35 or Active Switching Characteristics VCC = 5V, TA = 25C Symbol Parameter tPLH Input to Output tPHL Input to Output Skew Output to Output tLZ Enable to Output tHZ Enable to Output tZL Enable to Output tZH Enable to Output Conditions CL = 30 pF CL = 30 pF CL = 30 pF CL = 10 pF, S2 Open CL = 10 pF, S1 Open CL = 30 pF, S2 Open CL = 30 pF, S1 Open Min Typ Max Units 10 15 ns 10 15 ns 2.0 6.0 ns 15 35 ns 15 25 ns 20 30 ns 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 -55C to +125C temperature range for the DS726LS31M and across the 0C to +70C range for the DS26LS31. All typicals are given for V CC = 5V and TA = 25C. 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 DS005778-3 S1 and S2 of load circuit are closed except where shown. FIGURE 1. AC Test Circuit DS005778-4 f = 1 MHz, tr 15 ns, tf 6 ns FIGURE 2. Propagation Delays DS005778-5 f = 1 MHz, tr 15 ns, tf 6 ns FIGURE 3. Enable and Disable Times Typical Applications Two-Wire Balanced System, RS-422 DS005778-6 Note 6: RT is optional although highly recommended to reduce reflection. 3 www.national.com DS26LS31C/DS26LS31M Typical Performance Characteristics DS26LS31CN Unloaded IC vs Frequency vs TA DS26LS31 ICC vs VCC vs TA DS005778-7 DS26LS31CN VOH vs IOH vs TA DS005778-8 DS26LS31CN VOL vs IOL vs TA DS005778-10 DS005778-9 DS26LS31CN VOD vs IO vs TA DS005778-11 www.national.com 4 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 5 www.national.com 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 www.national.com 6 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. 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. 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) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790 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. 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