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SP3481 Datasheet(PDF) 6 Page - Sipex Corporation |
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SP3481 Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 9 page 10/15/02 SP3481/3485 Low Power Half-Duplex RS485 Transceivers © Copyright 2000 Sipex Corporation 6 Figure 8. Driver Propagation Delay Waveforms Figure 12. Receiver Enable and Disable Waveforms Figure 11. Receiver Propagation Delay Waveforms Figure 10. Driver Enable and Disable Timing Waveforms 0V VOH tPLH tPHL VOM tPHL tPLH 3V VOL VOH 1.5V 1.5V INPUT Y OUTPUT VOM Z OUTPUT VOL VOM VOM VOM = V OH + VOL 2 ≈ 1.5V 0V VOH tPZH 0.25V tPHZ VOM tPZL tPLZ 3V VOL VCC 1.5V 1.5V DE OUTPUT HIGH VOM 0.25V 0V OUTPUT LOW VOM = V OH + VOL 2 ≈ 1.5V 3V 0V VCC tRPLH 1.5V tRPHL VOM VOM 0V 1.5V INPUT OUTPUT VOM = V CC 2 NOTE 1: The input pulse is supplied by a generator with the following characteristics: PRR=250KHz, 50% duty cycle, t r < 6.0ns, Z0=50Ω. NOTE 2: C L includes probe and stray capacitance. IN 1.5V tDO1 1.5V tDO2 3V 0V OUT 50% 50% 10% 10% 90% 90% tTD tTD 2.0V -2.0V Figure 9. Driver Differential Output Delay and Transition Time Waveforms 3V 0V tPRHZ 1.5V tPRZH tPRSH 1.5V 1.5V 10% 0V VOH RE OUTPUT S1 is open S2 is closed S3 = 1.5V 3V 0V tPRLZ 1.5V tPRZL tPRSL 1.5V 1.5V 10% VCC RE OUTPUT S1 is closed S2 is open S3 = -1.5V VOL |
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