DS9638 RS-422 Dual High Speed Differential Line Driver General Description Features The DS9638 is a Schottky, TTL compatible, dual differential line driver designed specifically to meet the EIA Standard RS-422 specifications. It is designed to provide unipolar differential drive to twisted pair or parallel wire transmission lines. The inputs are TTL compatible. The outputs are similar to totem pole TTL outputs, with active pull-up and pull-down. The device features a short circuit protected active pull-up with low output impedance and is specified to drive 50Ω transmission lines at high speed. The mini-DIP provides high package density. Single 5V supply Schottky technology TTL and CMOS compatible inputs Output short circuit protection Input clamp diodes Complementary outputs Minimum output skew ( < 1.0 ns typical) 50 mA output drive capability for 50Ω transmission lines Meets EIA RS-422 specifications Propagation delay of less than 10 ns “Glitchless” differential output Delay time stable with VCC and temperature variations ( < 2.0 ns typical) (Figure 3) n Extended temperature range n n n n n n n n n n n n Connection Diagram 8-Lead DIP DS009622-1 Top View Order Number DS9638CM or DS9638CN See NS Package Number M08A or N08E For Complete Military Product Specifications, refer to the appropriate SMD or MDS. Order Number DS9638MJ/883 See NS Package Number J08A © 1998 National Semiconductor Corporation DS009622 www.national.com DS9638 RS-422 Dual High Speed Differential Line Driver May 1998 Absolute Maximum Ratings (Note 2) Ceramic DIP (Soldering, 60 sec.) 300˚C Molded DIP (Soldering, 10 sec.) 265˚C Maximum Power Dissipation (Note 1) at 25˚C Cavity Package 1300 mW Molded Package 930 mW SO Package 810 mW −5V to 7V VCC Lead Potential to Ground Input Voltage −0.5V to +7V If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Ceramic DIP Molded DIP and SO-8 Lead Temperature −65˚C to +175˚C −65˚C to +150˚C Recommended Operating Conditions DS9638M Supply Voltage (VCC) DS9638C Min Typ Max Min Typ Max 4.5 5.0 5.5 4.75 5.0 5.25 V −50 mA 50 mA 70 ˚C Output Current HIGH (IOH ) −50 Output Current LOW (IOL ) Operating Temperature (T A) −55 25 50 40 125 0 25 Units Note 1: Derate cavity package 8.7 mW/˚C above 25˚C; derate molded DIP package 7.5 mW/˚C above 25˚C; derate SO package 6.5 mW˚C above 25˚C. Electrical Characteristics (Notes 3, 4) Over recommended operating temperature and supply voltage ranges, unless otherwise specified Symbol Parameter VIH Input Voltage HIGH VIL Input Voltage LOW VIC Input Clamp Voltage VOH Output Voltage HIGH VOL Output Voltage LOW Conditions Input Current at Maximum Typ Max 2.0 0.8 −55˚C to +125˚C V CC = Min, II = −18 mA VCC = Min, IOH = −10 mA VIH = VIH Min, IOH = −40 mA VIL = VIL Max V CC = Min, VIH = VIH Min, 0.5 −1.0 2.5 Units V 0˚C to +70˚C −1.2 V V 3.5 V 2.0 = VIL Max, IOL = 40 mA V CC = Max, VI Max = 5.5V V II Min 0.5 V 50 µA 25 µA IL Input Voltage = Max, VIH = 2.7V = Max, VIL = 0.5V = Max, VO = 0V (Note 4) IIH Input Current HIGH V CC IIL Input Current LOW V CC IOS Output Short Circuit Current V CC T Terminated Output Voltage See Figure 1 T Output Balance 0.4 V V VT, V VT–V −50 −200 µA −150 mA 2.0 V VOS, V OS Output Offset Voltage 3.0 VOS–V OS Output Offset Balance 0.4 V 100 µA 65 mA = 25˚C IX Output Leakage Current T ICC Supply Current −0.25V < VX < 5.5V VCC = 5.5V, (Both Drivers) All input at 0V, A 45 No Load 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 DS9638M and across the 0˚C to +70˚C range for the DS9638C. All typicals are given for VCC = 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. www.national.com 2 Switching Characteristics VCC = 5.0V, TA = 25˚C. Symbol tPHL Parameter Propagation Delay tPLH Conditions CL = 15 pF RL = 100Ω, See Figure 2 Min Typ Max 10 20 Units ns 10 20 ns tf Fall Time, 90%–10% 10 20 ns tr Rise Time, 10%–90% 10 20 ns tPO–tPO Skew Between Outputs 1.0 ns A/A and B/B DS009622-2 FIGURE 1. Equivalent Circuit DC Test Circuit DS009622-3 FIGURE 2. Terminated Output Voltage and Output Balance 3 www.national.com DC Test Circuit (Continued) DS009622-5 DS009622-4 Note 6: The pulse generator has the following characteristics: CL includes probe and jig capacitance. PRR = 500 kHz, tW = 100 ns, tr ≤ 5.0 ns, ZO = 50Ω. FIGURE 3. AC Test Circuit and Voltage Waveform DS009622-6 DS009622-7 FIGURE 4. Typical Delay Characteristics www.national.com 4 Physical Dimensions inches (millimeters) unless otherwise noted Ceramic Dual-In-Line Package (J) Order Number DS9638MJ/883 NS Package Number J08A Ceramic Dual-In-Line Package (M) Order Number DS9638CM NS Package Number M08A 5 www.national.com DS9638 RS-422 Dual High Speed Differential Line Driver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number DS9638CN NS Package Number N08E 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. 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