DS26F31M Quad High Speed Differential Line Drivers General Description The DS26F31 is a quad differential line driver designed for digital data transmission over balanced lines. The DS26F31 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 DS26F31 offers improved performance due to the use of state-of-the-art L-FAST bipolar technology. The L-FAST technology allows for higher speeds and lower currents by utilizing extremely short gate delay times. Thus, the DS26F31 features lower power, extended temperature range, and improved specifications. The circuit provides an enable and disable function common to all four drivers. The DS26F31M features TRI-STATE ® outputs and logical OR-ed complementary enable inputs. The inputs are all LS compatible and are all one unit load. The DS26F31M offers optimum performance when used with the DS26F32 Quad Differential Line Receiver. Features n n n n n n n n n Military temperature range Output skew — 2.0 ns typical Input to output delay — 10 ns Operation from single +5.0V supply 16-lead ceramic DIP Package Outputs won’t load line when VCC = 0V Output short circuit protection Meets the requirements of EIA standard RS-422 High output drive capability for 100Ω terminated transmission lines Connection and Logic Diagrams 16-Lead Dual-In-Line Package DS009614-2 FIGURE 1. Logic Symbol 20-Lead Ceramic Leadless Chip Carrier (E) DS009614-1 Top View For Complete Military Product Specifications, refer to the appropriate SMD or MDS. Order Number DS26F31ME/883, DS26F31MJ/883, or DS26F31MW/883 See NS Package Numbers E20A, J16A, or W16A DS009614-7 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS009614 www.national.com DS26F31MQuad High Speed Differential Line Drivers May 1999 Absolute Maximum Ratings (Note 2) Supply Voltage Input Voltage Output Voltage If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. 7.0V 7.0V 5.5V Operating Range Storage Temperature Range Ceramic DIP −65˚C to +175˚C Lead Temperature Ceramic DIP (Soldering, 60 sec.) 300˚C Maximum Power (Note 1) Dissipation at 25˚C Cavity Package 1500 mW DS26F31M Temperature Supply Voltage −55˚C to +125˚C 4.5V to 5.5V Note 1: Derate cavity package 10 mW/˚C above 25˚C. Electrical Characteristics (Notes 3, 4) over operating range, unless otherwise specified Symbol Parameter VOH Output Voltage HIGH V CC VOL Output Voltage LOW V CC VIH Input Voltage HIGH V CC VIL Input Voltage LOW V CC CC Conditions = Min, IOH = −20 mA = Min, IOL = 20 mA = Min IIL Input Current LOW V Input Current HIGH V CC IIR Input Reverse Current V CC Off State (High Impedance) VCC = Max VIC Input Clamp Voltage V CC Output Short Circuit V CC ICCX Supply Current V CC V CC ICC tPLH tPHL = Min, II = −18 mA = Max (Note 5) = Max, All Outputs Disabled V 0.8 V −0.10 −0.20 mA 0.5 20 µA 0.001 0.1 mA 0.5 20 µA 0.5 −20 V 2.0 V −1.5 V mA 50 mA 40 mA 10 15 ns 10 15 ns 2.0 4.5 ns = 5.0V, TA = 25˚C, = 10 pF L V CC = 5.0V, TA = 25˚C, C L = 10 pF 23 32 ns 15 25 ns V CC = 5.0V, TA = 25˚C, Load = (Note 6) V CC = 5.0V, TA = 25˚C, Load = (Note 6) 20 30 ns 23 32 ns CC −30 = Max, All Outputs Enabled = 5.0V, TA = 25˚C, Input to Output Enable to Output 0.5 0.32 −150 Load = (Notes 6, 7) V CC = 5.0V, TA = 25˚C, tLZ Units −60 V Output to Output Max −0.8 Input to Output SKEW 3.2 VO = 2.5V VO = 0.5V Output Current IOS Typ 2.5 = Max = Max, VI = 0.4V = Max, VI = 2.7V = Max, VI = 7.0V IIH IOZ Min Load = (Note 6) V CC = 5.0V, TA = 25˚C, Load = (Notes 6, 7) V CC C tHZ Enable to Output tZL Enable to Output tZH Enable to Output 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 DS26F31M and across the O˚C to +70˚C range for the DS26F31C. All typicals are given for V CC = 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: Only one output at a time should be shorted. Note 6: CL = 30 pF, V I = 1.3V to VO = 1.3V, VPULSE = 0V to +3V (See AC Load Test Circuit for TRI-STATE Outputs). Note 7: Skew is defined as the difference in propagation delays between complementary outputs at the 50% point. www.national.com 2 Test Circuit and Timing Waveforms DS009614-3 FIGURE 2. AC Load Test Circuit for TRI-STATE Outputs DS009614-4 FIGURE 3. Propagation Delay (Notes 2, 4) DS009614-5 FIGURE 4. Enable and Disable Times (Notes 3, 4) Note 8: Diagram shown for Enable Low. Switches S1 and S2 open. Note 9: S1 and S2 of Load Circuit are closed except where shown. Note 10: Pulse Generator for all Pulses: Rate ≤ 1.0 MHz, ZO = 50Ω, tr ≤ 6.0 ns, tf ≤ 6.0 ns. Note 11: CL includes probe and jig capacitance. Typical Application DS009614-6 FIGURE 5. Typical Application 3 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Ceramic Leadless Chip Carrier (E) DS26F31ME/883 NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) DS26F31MJ/883 NS Package Number J16A www.national.com 4 DS26F31MQuad High Speed Differential Line Drivers Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Ceramic Flatpak (W) DS26F31MW/883 NS Package Number W16A 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. 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