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| DS1488 Quad Line Driver May 1998 DS1488 Quad Line Driver General Description 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. Features n n n n n Current limited output: 10 mA typ Power-off source impedance: 300 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 (c) 1998 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+ V- Input Voltage (VIN) Output Voltage +15V -15V -15V VIN 7.0V Operating Temperature Range 0C to +75C Storage Temperature Range -65C to +150C Maximum Power Dissipation (Note 1) at 25C Molded DIP Package 1280 mW SO Package 974 mW Lead Temperature (Soldering, 4 sec.) 260C Note 1: Derate molded DIP package 10.2 mW/C above 25C; derate SO package 7.8 mW/C above 25C. 15V Electrical Characteristics (Notes 3, 4) VCC+ = 9V, VCC- = -9V unless otherwise specified Symbol IIL IIH VOH VOL IOS+ IOS- ROUT ICC+ Parameter Logical "0" Input Current Logical "1" Input Current High Level Output Voltage Low Level Output Voltage High Level Output Short-Circuit Current Low Level Output Short-Circuit Current Output Resistance Positive Supply Current (Output Open) V+ = V- = 0V, VOUT = 2V VIN = 1.9V V+ = 9.0V, V- = -9.0V V+ = 12V, V- = -12V V+ = 15V, V- = -15V VIN = 0.8V V+ = 9.0V, V- = -9.0V V+ = 12V, V- = -12V 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 V+ = 15V, V- = -15V 300 15.0 19.0 25.0 4.5 5.5 8.0 -13.0 -18.0 -25.0 -0.001 -0.001 -0.01 252 444 20.0 25.0 34.0 6.0 7.0 12.0 -17.0 -23.0 -34.0 -0.015 -0.015 -2.5 333 576 mA mA mA mA mA mA mA mA mA mA mA mA mW mW VOUT = 0V, VIN = 1.9V 6.0 10.0 12.0 mA VIN = 0V VIN = +5.0V RL = 3.0 k, VIN = 0.8V RL = 3.0 k, Conditions Min Typ -1.0 0.005 V+ = 9.0V, V- = -9.0V V+ = 13.2V, V- = -13.2V V+ = 9.0V, V- = -9.0V 6.0 9.0 -6.0 -9.0 -6.0 7.0 10.5 -6.8 -10.5 -10.0 -12.0 Max -1.3 10.0 Units mA A V V V V mA VIN = 1.9V V+ = 13.2V, V- = -13.2V VOUT = 0V, VIN = 0.8V ICC- Negative Supply Current (Output Open) VIN = 1.9V VIN = 0.8V Pd Power Dissipation V+ = 9.0V, V- = -9.0V V+ = 12V, V- = -12V Switching Characteristics (VCC = 9V, VEE = -9V, TA = 25C) Symbol tpd1 tpd0 tr tf Parameter Propagation Delay to a Logical "1" Propagation Delay to a Logical '0" Rise Time Fall Time Conditions RL = 3.0 k, CL = 15 pF, TA = 25C RL = 3.0 k, CL = 15 pF, TA = 25C RL = 3.0 k, CL = 15 pF, TA = 25C RL = 3.0 k, CL = 15 pF, TA = 25C Min Typ 230 70 75 40 Max 350 175 100 75 Units ns ns ns 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 0C to +75C 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 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. 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. Typical Applications RS-232C Data Transmission DS005776-3 Note 5: Optional for noise filtering DTL/TTL-to-MOS Translator DTL/TTL-to-HTL Translator DS005776-4 DS005776-5 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 = +25C unless otherwise noted DS005776-10 DS005776-9 FIGURE 1. Transfer Characteristics vs Power Supply Voltage FIGURE 2. Short-Circuit Output Current vs Temperature DS005776-11 DS005776-12 FIGURE 3. Output Slew Rate vs Load Capacitance FIGURE 4. Output Voltage and Current-Limiting Characteristics www.national.com 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 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 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 Francais 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: 81-3-5620-6175 Fax: 81-3-5620-6179 www.national.com 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. |
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