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MC34C87 Datasheet(PDF) 3 Page - Motorola, Inc |
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MC34C87 Datasheet(HTML) 3 Page - Motorola, Inc |
3 / 4 page MC34C87 MOTOROLA 3 AC CHARACTERISTICS (VCC = 4.5 to 5.5 V, TA = – 40 to + 85°C, unless otherwise stated) Parameter Symbol Min Typ Max Unit Propagation Delay Input to Output (S1 Open) tPLH tPHL — 6 12 ns Output Skew (S1 Open)* Skew — 1.0 4 ns Differential Output Rise Time Fall Time (S1 Open) tTLH tTHL — 4 8 ns Output Enable Time (S1 Closed) tPZH tPZL — — 16 15 — — ns Output Disable Time (S1 Closed) tPHZ tPLZ — — 6 9 — — ns * Skew: difference in propagation delays between complementary outputs. AC TEST CIRCUIT AND SWITCHING TIME WAVEFORMS 47 pF 47 pF 47 pF 49.9 Ω 49.9 Ω 499 Ω S1 1.5 V INPUT Figure 1. AC Test Circuit OUTPUT A 1.5 V tPHL OUTPUT B 1.5 V 1.5 V 1.5 V INPUT 1.5 V 1.5 V — VOH VOL VOH — VOL tPLH tPLH tPHL SKEW 3 V — 0 V Figure 2. Propagation Delays and Skew Waveforms Figure 3. Enable and Disable Times OUTPUT A 1.5 V tPZL OUTPUT B 0.8 V 1.5 V ENABLE INPUT VOH – 0.5 V 2.0 V — 1.5 V VOL VOH tPLZ tPZH tPHZ 3 V — 0 V — 1.5 V VOL + 0.5 V Figure 4. Differential Rise and Fall Times OUTPUT (DIFFERENTIAL) 90% tTHL 10% 90% INPUT tTLH 3 V — 0 V 10% TYPICAL APPLICATIONS Figure 5. Two–Wire Balanced Systems (EIA–422–A) + – DATA DATA OUTPUT ENABLE |
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