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DS9638 Dataheets PDF



Part Number DS9638
Manufacturers National Semiconductor
Logo National Semiconductor
Description RS-422 Dual High Speed Differential Line Driver
Datasheet DS9638 DatasheetDS9638 Datasheet (PDF)

DS9638 RS-422 Dual High Speed Differential Line Driver May 1998 DS9638 RS-422 Dual High Speed Differential Line Driver General Description 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.

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DS9638 RS-422 Dual High Speed Differential Line Driver May 1998 DS9638 RS-422 Dual High Speed Differential Line Driver General Description 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. Features 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 Absolute Maximum Ratings (Note 2) 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 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 Recommended Operating Conditions DS9638M Min Supply Voltage (VCC) Output Current HIGH (IOH ) Output Current LOW (IOL ) Operating Temperature (T A) −55 25 4.5 Typ 5.0 Max 5.5 −50 50 125 40 0 25 Min 4.75 DS9638C Typ 5.0 Max 5.25 −50 50 70 Units V mA mA ˚C 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 VIH VIL VIC VOH Parameter Input Voltage HIGH Input Voltage LOW Input Clamp Voltage Output Voltage HIGH 0˚C to +70˚C −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, V II IIH IIL IOS VT, V VT–V T T OS OS Conditions Min 2.0 Typ Max 0.8 0.5 Units V V V V −1.0 2.5 2.0 3.5 −1.2 VOL Output Voltage LOW Input Current at Maximum Input Voltage Input Current HIGH Input Current LOW Output Short Circuit Current Terminated Output Voltage Output Balance Output Offset Voltage Output Offset Balance Output Leakage Current Supply Current (Both Drivers) 0.5 50 25 −200 −50 2.0 0.4 3.0 0.4 −150 V µA µA µA mA V V V V µA = VIL Max, IOL = 40 mA V CC = Max, VI Max = 5.5V IL V V V CC CC CC = Max, VIH = 2.7V = Max, VIL = 0.5V = Max, VO = 0V (Note 4) See Figure 1 VOS, V VOS–V IX ICC T A = 25˚C 100 −0.25V < VX < 5.5V VCC = 5.5V, All input at 0V, No Load 45 65 mA 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 tPLH tf tr tPO–tPO Fall Time, 90%–10% Rise Time, 10%–90% Skew Between Outputs A/A and B/B Parameter Propagation Delay Conditions CL = 15 pF RL = 100Ω, See Figure 2 Min Typ 10 10 10 10 1.0 Max 20 20 20 20 Units ns ns ns ns ns 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 D.


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