DS34C87T CMOS Quad TRISTATE 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 DS008576-2 Truth Table Input DS008576-1 Top View Order Number DS34C87TM or DS34C87TN See NS Package Number M16A or N16E 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) TRI-STATE ® is a registered trademark of National Semiconductor Corporation. © 1998 National Semiconductor Corporation DS008576 www.national.com DS34C87T CMOS Quad TRI-STATE™ Differential Line Driver May 1998 Absolute Maximum Ratings (Notes 1, 2) Plastic “N” Package 1736 mW SOIC Package 1226 mW Lead Temperature (TL) (Soldering 4 sec) 260˚C This device does not meet 2000V ESD rating. (Note 12) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DC Voltage (VIN) −0.5 to 7.0V −1.5 to VCC +1.5V −0.5 to 7V ± 20 mA Operating Conditions DC Output Voltage (VOUT ) Clamp Diode Current (IIK , IOK) DC Output Current, per pin (I ± 150 mA OUT) ± 150 mA DC VCC or GND Current (ICC) Storage Temperature Range (T STG) −65˚C to +150˚C Maximum Power Dissipation (PD) @ 25˚C (Note 3) DC Electrical Characteristics Supply Voltage (VCC) DC Input or Output Voltage (VIN, VOUT) Operating Temperature Range (TA) DS34C87T Input Rise or Fall Times (tr, tf) Min 4.50 0 Max 5.50 VCC Units V V −40 +85 500 ˚C ns (Note 4) VCC = 5V ± 10% (unless otherwise specified) Symbol Parameter Conditions High Level Input VIH Min Typ Max Units 2.0 V Voltage VIL Low Level Input 0.8 V Voltage VOH VOL VT |VT|–| V T| High Level Output V Voltage I V I R (Note 5) R L = 100 Ω Common Mode OS| Difference In Common Mode Output IIN Input Current ICC Quiescent Supply Current IOZ TRI-STATE ™ Output Leakage Current ISC IOFF 3.4 0.3 = 100 Ω Differential Output Difference In 2.5 IN Voltage Output Voltage |VOS– V = VIH or VIL, = −20 mA = VIH or VIL, OUT = 48 mA Low Level Output Voltage Differential Output VOS IN V OUT L 2.0 (Note 5) R L = 100 Ω 3.1 2.0 (Note 5) R L = 100 Ω (Note 5) V IN = VCC, GND, VIH, or VIL I OUT = 0 µA, = VCC or GND = 2.4V or 0.5V (Note 6) V OUT = VCC or GND Control = VIL 0.5 V V 0.4 V 3.0 V 0.4 V ± 1.0 µA V IN 200 500 µA V IN 0.8 2.0 mA ± 0.5 ± 5.0 µA −150 mA = VCC or GND Output Short V Circuit Current Power Off Output (Notes 5, 7) VCC = 0V Leakage Current (Note 5) IN −30 VOUT = 6V VOUT = −0.25V 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. 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. www.national.com 2 Switching Characteristics (Note 4) VCC = 5V ± 10%, t r, tf ≤ 6 ns (Figures 1, 2, 3, 4) Symbol tPLH, tPHL Parameter Propagation Delay Typ Max Units S1 Open Conditions Min 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 ns And Fall Times tPZH Output Enable Time S1 Closed 12 25 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 Propagation Delay DS34C87 DS3487 Units Typ Max Typ Max 6 10 10 15 ns 1.5 2.0 4 7 10 15 ns Input to Output Skew (Note 8) tTHL, tTLH Differential Output Rise ns and Fall Times tPHZ tPLZ Output Disable Time CL = 50 pF, RL = 200Ω, 8 11 17 25 ns (Note 9) S1 Closed, S2 Closed CL = 50 pF, RL = 200Ω, 7 10 15 25 ns Output Enable Time S1 Closed, S2 Closed CL = 50 pF, RL = ∞, 11 19 11 25 ns Output Enable Time S1 Open, S2 Closed CL = 50 pF, RL = 200Ω, 14 21 15 25 ns Output Disable Time (Note 9) tPZH tPZL 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 EIAJ (0Ω, 200 pF) All Pins ≥ 350V 3 www.national.com AC Test Circuit and Switching Time Waveforms DS008576-3 Note: C1 = C2 = C3 = 40 pF (including Probe and Jig Capacitance), R1 = R2 = 50Ω, R3 = 500Ω FIGURE 1. AC Test Circuit DS008576-8 FIGURE 5. Propagation Delays Test Circuit for “LS-Type” Load DS008576-4 FIGURE 2. Propagation Delays DS008576-6 FIGURE 6. Differential Rise and Fall Times Test Circuit for “LS-Type” Load DS008576-5 FIGURE 3. Enable and Disable Times DS008576-9 DS008576-7 FIGURE 7. Load Enable and Disable Times Test Circuit for “LS-Type” Load Input pulse; f = 1 MHz, 50%, tr ≤ 6 ns, tf ≤ 6 ns FIGURE 4. Differential Rise and Fall Times www.national.com 4 AC Test Circuit and Switching Time Waveforms (Continued) DS008576-10 FIGURE 8. Load Propagation Delays for “LS-Type” Load DS008576-11 FIGURE 9. Load Enable and Disable Times for “LS-Type” Load Typical Applications DS008576-12 *RT is optional although highly recommended to reduce reflection. 5 www.national.com 6 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 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. 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