DS34C87T CMOS Quad TRI-STATE Differential Line Driver General Description Features The DS34C87T is a quad differential line driver designed for digital data transmission over balanced lines. The DS34C87T meets all the requirements of EIA standard RS-422 while retaining the low power characteristics of CMOS. This enables the construction of serial and terminal interfaces while maintaining minimal power consumption. The DS34C87T accepts TTL or CMOS input levels and translates these to RS-422 output levels. This part uses special output circuitry that enables the individual drivers to power down without loading down the bus. This device has separate enable circuitry for each pair of the four drivers. The DS34C87T is pin compatible to the DS3487T. All inputs are protected against damage due to electrostatic discharge by diodes to VCC and ground. n n n n n n n n n TTL input compatible Typical propagation delays: 6 ns Typical output skew: 0.5 ns Outputs won’t load line when VCC = 0V Meets the requirements of EIA standard RS-422 Operation from single 5V supply TRI-STATE outputs for connection to system buses Low quiescent current Available in surface mount Connection and Logic Diagrams Dual-In-Line Package 00857602 Truth Table Input 00857601 See Pin Description Table for details Top View Order Number DS34C87TM or DS34C87TN See NS Package Number M16A or N16E © 2002 National Semiconductor Corporation DS008576 Control Non-Inverting Inverting Input Output Output H H H L L H L H X L Z Z L = Low logic state H = High logic state X = Irrelevant Z = TRI-STATE (high performance) www.national.com DS34C87T CMOS Quad TRI-STATE Differential Line Driver April 2002 DS34C87T Absolute Maximum Ratings (Notes 1, 2) Plastic “N” Package 1736 mW SOIC Package 1226 mW Lead Temperature (TL) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Soldering 4 sec) 260˚C This device does not meet 2000V ESD rating. (Note 12) Supply Voltage (VCC) −0.5 to 7.0V DC Voltage (VIN) −1.5 to VCC +1.5V DC Output Voltage (VOUT ) Operating Conditions Min Max Units −0.5 to 7V Supply Voltage (VCC) ± 20 mA Clamp Diode Current (IIK , IOK) 4.50 5.50 DC Input or Output Voltage (VIN, VOUT) DC Output Current, per pin (I DC VCC or GND Current (ICC) Storage Temperature Range (T DS34C87T V −40 +85 ˚C 500 ns Input Rise or Fall Times (tr, tf) −65˚C to +150˚C STG) V VCC Operating Temperature Range (TA) ± 150 mA ± 150 mA OUT) 0 Maximum Power Dissipation (PD) @ 25˚C (Note 3) DC Electrical Characteristics (Note 4) VCC = 5V ± 10% (unless otherwise specified) Symbol VIH Parameter Conditions High Level Input Min Typ Max Units 2.0 V Voltage VIL Low Level Input 0.8 V Voltage VOH High Level Output Voltage I VOL Low Level Output V Voltage I VT Differential Output R Voltage (Note 5) |VT|–| V T| Difference In R Differential Output (Note 5) Common Mode R Output Voltage (Note 5) Difference In R Common Mode Output (Note 5) VOS |VOS– V OS| V IN = VIH or VIL, OUT IN L L L 0.3 = 100 Ω 2.0 = 100 Ω V Quiescent Supply I Current V TRI-STATE ™ Output Leakage Current Control = VIL ISC Output Short V Circuit Current (Notes 5, 7) IOFF Power Off Output VCC = 0V VOUT = 6V Leakage Current (Note 5) VOUT = −0.25V V V 3.0 V 0.4 V ± 1.0 µA 500 µA 0.8 2.0 mA ± 0.5 ± 5.0 µA −150 mA = 100 Ω Input Current = VCC, GND, VIH, or VIL = 0 µA, IN = VCC or GND V IN = 2.4V or 0.5V (Note 6) V OUT IN V 0.4 2.0 ICC IOZ 0.5 3.1 = 100 Ω OUT V = 48 mA IIN IN 3.4 = −20 mA = VIH or VIL, OUT L 2.5 200 = VCC or GND = VCC or GND −30 100 −100 µA µA Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of “Electrical Characteristics” provide conditions for actual device operation. Note 2: Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive; all currents out of device pins are negative. Note 3: Ratings apply to ambient temperature at 25˚C. Above this temperature derate N Package 13.89 mW/˚C, and M Package 9.80 mW/˚C. Note 4: Unless otherwise specified, min/max limits apply across the −40˚C to 85˚C temperature range. All typicals are given for VCC = 5V and TA = 25˚C. Note 5: See EIA Specification RS-422 for exact test conditions. www.national.com 2 DS34C87T DC Electrical Characteristics (Note 4) (Continued) Note 6: Measured per input. All other inputs at VCC or GND. Note 7: This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted. Switching Characteristics (Note 4) VCC = 5V ± 10%, t r, tf ≤ 6 ns (Figures 1, 2, 3, 4) Symbol tPLH, tPHL Parameter Conditions Propagation Delay Min Typ Max Units S1 Open 6 11 ns Input to Output Skew (Note 8) S1 Open 0.5 3 ns tTLH, tTHL Differential Output Rise S1 Open 6 10 ns And Fall Times tPZH Output Enable Time S1 Closed 12 25 ns tPZL Output Enable Time S1 Closed 13 26 ns tPHZ Output Disable Time (Note 9) S1 Closed 4 8 ns tPLZ Output Disable Time (Note 9) S1 Closed 6 12 CPD Power Dissipation ns 100 pF 6 pF Capacitance (Note 10) CIN Input Capacitance Note 8: Skew is defined as the difference in propagation delays between complementary outputs at the 50% point. Note 9: Output disable time is the delay from the control input being switched to the output transistors turning off. The actual disable times are less than indicated due to the delay added by the RC time constant of the load. Note 10: CPD determines the no load dynamic power consumption, PD = CPD V2CC f + ICC VCC, and the no load dynamic current consumption, IS = CPD VCC f + ICC. Comparison Table of Switching Characteristics into “LS-Type” Load(Note 11) VCC = 5V, TA = +25˚C, tr ≤ 6 ns, tf ≤ 6 ns (Figures 4, 5, 6, 7, 8, 9) Symbol tPLH, tPHL Parameter Conditions DS34C87 Propagation Delay DS3487 Units Typ Max Typ Max 6 10 10 15 1.5 2.0 4 7 10 15 ns 8 11 17 25 ns ns Input to Output Skew (Note 8) tTHL, tTLH Differential Output Rise ns and Fall Times tPHZ Output Disable Time CL = 50 pF, RL = 200Ω, (Note 9) S1 Closed, S2 Closed tPLZ Output Disable Time CL = 50 pF, RL = 200Ω, 7 10 15 25 ns (Note 9) tPZH Output Enable Time S1 Closed, S2 Closed CL = 50 pF, RL = ∞, 11 19 11 25 ns 14 21 15 25 ns S1 Open, S2 Closed tPZL Output Enable Time CL = 50 pF, RL = 200Ω, S1 Closed, S2 Open Note 11: This table is provided for comparison purposes only. The values in this table for the DS34C87 reflect the performance of the device but are not tested or guaranteed. Note 12: ESD Rating: HBM (1.5 kΩ, 100 pF) Inputs ≥ 1500V Outputs ≥ 1000V 3 EIAJ (0Ω, 200 pF) All Pins ≥ 350V www.national.com DS34C87T AC Test Circuit and Switching Time Waveforms 00857603 Note: C1 = C2 = C3 = 40 pF (including Probe and Jig Capacitance), R1 = R2 = 50Ω, R3 = 500Ω FIGURE 1. AC Test Circuit 00857604 00857607 Input pulse; f = 1 MHz, 50%, tr ≤ 6 ns, tf ≤ 6 ns FIGURE 2. Propagation Delays FIGURE 4. Differential Rise and Fall Times 00857608 FIGURE 5. Propagation Delays Test Circuit for “LS-Type” Load 00857605 FIGURE 3. Enable and Disable Times www.national.com 4 DS34C87T AC Test Circuit and Switching Time Waveforms (Continued) 00857609 00857606 FIGURE 7. Load Enable and Disable Times Test Circuit for “LS-Type” Load FIGURE 6. Differential Rise and Fall Times Test Circuit for “LS-Type” Load 00857610 FIGURE 8. Load Propagation Delays for “LS-Type” Load 00857611 FIGURE 9. Load Enable and Disable Times for “LS-Type” Load Typical Applications 00857612 *RT is optional although highly recommended to reduce reflection. 5 www.national.com DS34C87T Pin Description Table Pin Number Pin Name (DIP or SOP package) Function 1 INPUT A Channel A - TTL/CMOS input 2 OUTPUT A - True True Output for Channel A, RS422 Levels 3 OUTPUT A - Inverting Inverting Output for Channel A, RS422 Levels 4 A/B CONTROL Enable Pin for Channels A and B, Active High, TTL/CMOS Levels 5 OUTPUT B - Inverting Inverting Output for Channel B, RS422 Levels 6 OUTPUT B - True True Output for Channel B, RS422 Levels 7 INPUT B Channel B - TTL/CMOS input 8 GND Ground Pin (0 V) 9 INPUT C Channel C - TTL/CMOS input 10 OUTPUT C - True True Output for Channel C, RS422 Levels 11 OUTPUT C - Inverting Inverting Output for Channel C, RS422 Levels 12 C/D CONTROL Enable Pin for Channels C and D, Active High, TTL/CMOS Levels 13 OUTPUT D - Inverting Inverting Output for Channel D, RS422 Levels 14 OUTPUT D - True True Output for Channel D, RS422 Levels 15 INPUT D Channel D - TTL/CMOS input 16 VCC Power Supply Pin, 5.0V typical www.national.com 6 DS34C87T Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Molded Package Small Outline (M) Order Number DS34C87TM NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DS34C87TN NS Package Number N16E 7 www.national.com DS34C87T CMOS Quad TRI-STATE Differential 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. National Semiconductor Corporation Americas Email: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 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. 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