DS1488 Quad Line Driver General Description Features The DS1488 is a quad line driver which converts standard TTL input logic levels through one stage of inversion to output levels which meet EIA Standard RS-232D and CCITT Recommendation V.24. n n n n n Current limited output: ± 10 mA typ Power-off source impedance: 300Ω min Simple slew rate control with external capacitor Flexible operating supply range 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 © 1999 National Semiconductor Corporation DS005776 www.national.com DS1488 Quad Line Driver July 1999 Absolute Maximum Ratings (Note 2) 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 SO Package 974 mW Lead Temperature (Soldering, 4 sec.) 260˚C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage V+ V− Input Voltage (VIN) +15V −15V −15V ≤ VIN ≤ 7.0V ± 15V Output Voltage 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 −0.8 −1.3 mA 0.005 10.0 µA IIL Logical “0” Input Current IIH Logical “1” Input Current VOH High Level Output Voltage VIN = 0V VIN = +5.0V RL = 3.0 kΩ, Low Level Output Voltage VIN = 0.8V RL = 3.0 kΩ, −6.0 7.0 V −9.0 −10.6 V High Level Output VIN = 1.9V V+ = 13.2V, V− = −13.2V VOUT = 0V, VIN = 0.8V −6.0 −10.0 −12.0 mA VOUT = 0V, VIN = 1.9V 6.0 10.0 12.0 mA V+ = V− = 0V, VOUT = ± 2V VIN = 1.9V V+ = 9.0V, V− = −9.0V V+ = 12V, V− = −12V 300 11.6 20.0 mA 15.7 25.0 mA 19.4 34.0 mA 3.4 6.0 mA 4.1 7.0 mA VOL IOS+ V+ = 9.0V, V− = −9.0V V+ = 13.2V, V− = −13.2V V+ = 9.0V, V− = −9.0V 6.0 7.1 V 9.0 10.7 V Short-Circuit Current IOS− Low Level Output Short-Circuit Current ROUT Output Resistance ICC+ Positive Supply Current (Output Open) VIN = 0.8V ICC− Negative Supply Current VIN = 1.9V V+ = 15V, V− = −15V V+ = 9.0V, V− = −9.0V V+ = 12V, V− = −12V VIN = 0.8V V+ = 15V, V− = −15V V+ = 9.0V, V− = −9.0V V+ = 12V, V− = −12V (Output Open) Pd Power Dissipation V+ = 15V, V− = −15V V+ = 9.0V, V− = −9.0V V+ = 12V, V− = −12V V+ = 15V, V− = −15V V+ = 9.0V, V− = −9.0V V+ = 12V, V− = −12V Ω 9.1 12.0 mA −10.8 −17.0 mA −14.6 −23.0 mA −18.3 −34.0 mA −0.001 −0.100 mA −0.001 −0.100 mA −0.01 −2.5 mA 252 333 mW 444 576 mW Switching Characteristics (VCC = 9V, VEE = −9V, TA = 25˚C) Symbol Parameter tpd1 Propagation Delay to a Logical “1” tpd0 Propagation Delay to a Logical “0” tr Rise Time tf Fall Time Conditions RL = 3.0 kΩ, CL = 15 pF, TA = 25˚C RL = 3.0 kΩ, CL = 15 pF, TA = 25˚C RL = 3.0 kΩ, CL = 15 pF, TA = 25˚C RL = 3.0 kΩ, CL = 15 pF, TA = 25˚C Min Typ Max Units 187 350 ns 45 175 ns 63 100 ns 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 RS-232C specifies that the output slew rate must not exceed 30V per microsecond. Using the worst case output short circuit current of 12 mA in the above equation, calculations result in a required capacitor of 400 pF connected to each output. See Typical Performance Characteristics. 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 appropriate capacitor value may be calculated using the following relationship C = ISC (∆T/∆V) where C is the required capacitor, ISC is the short circuit current value, and ∆V/∆T is the slew rate. Typical Applications RS-232C Data Transmission DS005776-3 Note 5: Optional for noise filtering DTL/TTL-to-MOS Translator DTL/TTL-to-HTL Translator DS005776-5 DS005776-4 DTL/TTL-to-RTL Translator DS005776-6 3 www.national.com AC Load Circuit and Switching Time Waveforms DS005776-7 *CL includes probe and jig capacitance. DS005776-8 tr and tf are measured between 10% and 90% of the output waveform. Typical Performance Characteristics TA = +25˚C unless otherwise noted DS005776-9 FIGURE 1. Transfer Characteristics vs Power Supply Voltage DS005776-10 FIGURE 2. Short-Circuit Output Current vs Temperature DS005776-11 DS005776-12 FIGURE 3. Output Slew Rate vs Load Capacitance www.national.com FIGURE 4. Output Voltage and Current-Limiting Characteristics 4 Physical Dimensions inches (millimeters) unless otherwise noted SO Package (M) Order Number DS1488M NS Package Number M14A Molded Dual-In-Line Package (N) Order Number DS1488N NS Package Number N14A 5 www.national.com DS1488 Quad Line Driver Notes 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. 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