DS1488

DS1488 NSC | Alldatasheet

Document overview

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Technical content

Features

n Current limited output:±10 mA typ n Power-off source impedance: 300Ω min n Simple slew rate control with external capacitor n Flexible operating supply range n Inputs are TTL/LS compatible Schematic and Connection Diagrams 1/4 Circuit DS005776-1 Dual-In-Line Package DS005776-2 Top View Order Number DS1488M or DS1488N See NS Package Number M14A or N14A July 1999 DS1488 Quad Line Driver © 1999 National Semiconductor Corporation DS005776 www.national.com

Absolute Maximum Ratings(Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage V + +15V V− −15V Input Voltage (VIN) −15V ≤ VIN ≤ 7.0V Output Voltage ±15V Operating Temperature Range 0˚C to +75˚C Storage Temperature Range −65˚C to +150˚C Maximum Power Dissipation (Note 1) at 25˚C Molded DIP Package 1280 mW Lead Temperature (Soldering, 4 sec.) 260˚C Note 1:Derate molded DIP package 10.2 mW/˚C above 25˚C; derate SO package 7.8 mW/˚C above 25˚C. Electrical Characteristics(Notes 3, 4) VCC + = 9V, VCC − = −9V unless otherwise specified Symbol Parameter Conditions Min Typ Max Units IIL Logical “0” Input Current VIN = 0V −0.8 −1.3 mA IIH Logical “1” Input Current VIN = +5.0V 0.005 10.0 µA IOS + High Level Output V OUT = 0V, VIN = 0.8V −6.0 −10.0 −12.0 mA Short-Circuit Current IOS − Low Level Output V OUT = 0V, VIN = 1.9V 6.0 10.0 12.0 mA Short-Circuit Current R OUT Output Resistance V + = V− = 0V, VOUT = ±2V 300 Ω (Output Open) V + = 12V, V− = −12V 15.7 25.0 mA V+ = 15V, V− = −15V 19.4 34.0 mA (Output Open) V + = 12V, V− = −12V −14.6 −23.0 mA Pd Power Dissipation V + = 9.0V, V− = −9.0V 252 333 mW V+ = 12V, V− = −12V 444 576 mW Switching Characteristics (VCC = 9V, VEE = −9V, TA = 25˚C) Symbol Parameter Conditions Min Typ Max Units tpd1 Propagation Delay to a Logical “1” R L = 3.0 kΩ ,C L = 15 pF, TA = 25˚C 187 350 ns tpd0 Propagation Delay to a Logical “0” R L = 3.0 kΩ ,C L = 15 pF, TA = 25˚C 45 175 ns tr Rise Time R L = 3.0 kΩ ,C L = 15 pF, TA = 25˚C 63 100 ns tf Fall Time R L = 3.0 kΩ ,C L = 15 pF, TA = 25˚C 33 75 ns Note 2:“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 3:Unless otherwise specified min/max limits apply across the 0˚C to +75˚C temperature range for the DS1488. Note 4: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. www.national.com 2

Applications

By connecting a capacitor to each driver output the slew rate can be controlled utilizing the output current limiting characteristics of the DS1488. For a set slew rate the ap- propriate capacitor value may be calculated using the fol- lowing relationship C = I SC (ΔT/ΔV) where C is the required capacitor, ISC is the short circuit current value, andΔV/ΔT is the slew rate. RS-232C specifies that the output slew rate must not ex- ceed 30V per microsecond. Using the worst case output short circuit current of 12 mA in the above equation, calcu- lations result in a required capacitor of 400 pF connected to each output. See Typical Performance Characteristics. Typical Applications RS-232C Data Transmission DS005776-3 Note 5:Optional for noise filtering DTL/TTL-to-MOS Translator DS005776-4 DTL/TTL-to-HTL Translator DS005776-5 DTL/TTL-to-RTL Translator DS005776-6 www.national.com3

Physical Dimensionsinches (millimeters) unless otherwise noted Order Number DS1488M Molded Dual-In-Line Package (N) Order Number DS1488N www.national.com5

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 Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com DS1488 Quad Line Driver 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.