General Description Features The DS75121 is a monolithic dual line driver designed to drive long lengths of coaxial cable, strip line, or twisted pair transmission lines having impedances from 50Ω to 500Ω. It is compatible with standard TTL logic and supply voltage levels. The DS75121 will drive terminated low impedance lines due to the low-impedance emitter-follower outputs. In addition the outputs are uncommitted allowing two or more drivers to drive the same line. Output short-circuit protection is incorporated to turn off the output when the output voltage drops below approximately 1.5V. n Designed for digital data transmission over 50Ω to 500Ω coaxial cable, strip line, or twisted pair transmission lines n TTL compatible n Open emitter-follower output structure for party-line operation n Short-circuit protection n AND-OR logic configuration n High speed (max propagation delay time 20 ns) n Plug-in replacement for the SN75121 and the 8T13 Connection Diagram Typical Performance Characteristics Deal-In-Line Package DS75121 DS75121 Dual Line Drivers DS75121 Dual Line Drivers March 1992 DS005788-2 DS005788-1 Truth Table Top View Order Number DS75121N See NS Package Number N16A Inputs Output A B C D E F Y H H H H X X H X X X X H H H All Other Input L Combinations H = High Level, L = Low Level, X = Irrelevant © 1997 National Semiconductor Corporation www.national.com DS005788 PrintDate=1997/04/28 PrintTime=10:12:52 6137 ds005788 Rev. No. 1 Proof 1 1 AC Test Circuit and Switching Time Waveforms DS005788-4 DS005788-3 Note 1: The pulse generators have the following characteristics: ZOUT ≈ 50Ω, tW = 200 ns, duty cycle = 50%, tr, = tf = 5.0 ns. Note 2: CL includes probe and jig capacitance. www.national.com PrintDate=1997/04/28 PrintTime=10:12:53 6137 ds005788 Rev. No. 1 2 Proof 2 Absolute Maximum Ratings (Note 4) Lead Temperature (Soldering, 4 seconds) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage, VCC Input Voltage Output Voltage Output Current Maximum Power Dissipation (Note 3) at 25˚C Molded Package 260˚C Operating Conditions 6.0V 6.0V 6.0V −75 mA Supply Voltage, VCC Temperature, TA DS75121 Min 4.75 Max 5.25 Units V 0 +75 ˚C Note 3: Derate molded package 10.2 n/w/˚C above 25˚C. 1280 mW Electrical Characteristics (Notes 5, 6) VCC = 4.75V to 5.25V (unless otherwise noted) Symbol Parameter VIH High Level Input Voltage VIL Low Level Input Voltage Conditions VI Input Clamp Voltage Input Current at Max Input Voltage VOH High Level Output Voltage IOH High Level Output Current IOL Low Level Output Current IO(OFF) Off State Output Current IIH High Level Input Current IIL Low Level Input Current IOS Short Circuit Output Current Supply Current, Outputs High ICCL Supply Current, Outputs Low Typ Max Units 0.8 V 2.0 II ICCH Min VCC = 5.0V, II = −12 mA VCC = 5.25V, VIN = 5.5V VIH = 2.0V, IOH = −75 mA (Note 7) VCC = 5.0V, VIH = 4.75V, VOH = 2.0V, V V 1 mA 2.4 V −100 −250 TA = 25˚C (Note 7) VIL = 0.8V, VOL = 0.4V (Note 7) VCC = 0V, VO = 3.0V VI = 4.5V VI = 0.4V VCC = 5.0V, TA = 25˚C VCC = 5.25V, All Inputs at 2.0V, Outputs Open VCC = 5.25V, All Inputs at 0.8V, Outputs Open −1.5 −0.1 mA −800 µA 500 µA 40 µA −1.6 mA −30 mA 28 mA 60 mA Switching Characteristics VCC = 5.0V, TA = 25˚C Symbol tPLH Parameter Min Propagation Delay Time, and Switching Time Waveforms) RL = 37Ω, (See AC Test Circuit High-to-Low Level Output and Switching Time Waveforms) CL = 1000 pF Low-to-High Level Output tPHL Conditions RL = 37Ω, (See AC Test Circuit CL = 15 pF CL = 1000 pF CL = 15 pF Propagation Delay Time, Typ Max Units 11 20 ns 22 50 ns 8.0 20 ns 20 50 ns Note 4: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Except for “Operating Temperature Range” they are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation. Note 5: Unless otherwise specified min/max limits apply across the 0˚C to +70˚C range for the DS75121. All typical values are for TA = 25˚C and VCC = 5V. Note 6: All currents into device pins shown as positive, out of device pins as negative, all voltages referenced to ground unless otherwise noted. All values shown as max or min on absolute value basis. Note 7: The output voltage and current limits are guaranteed for any appropriate combination of high and low inputs specified by the truth table for the desired output. 3 PrintDate=1997/04/28 PrintTime=10:12:55 6137 ds005788 Rev. No. 1 Book Extract End www.national.com Proof 3 DS75121 Dual Line Drivers Physical Dimensions inches (millimeters) Molded Dual-In-Line Packge (N) Order Number DS75121N NS Package Number N16A 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. 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. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 www.national.com 4 National Semiconductor Europe Fax: (+49) 0-180-530 85 86 Email: cnjwge@tevm2.nsc.com Deutsch Tel: (+49) 0-180-530 85 85 English Tel: (+49) 0-180-532 78 32 Français Tel: (+49) 0-180-532 93 58 Italiano Tel: (+49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-043-299-2308 Fax: 81-043-299-2408 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. PrintDate=1997/04/28 PrintTime=10:12:55 6137 ds005788 Rev. No. 1 Proof 4