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SP490 数据表(PDF) 4 Page - Sipex Corporation |
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SP490 数据表(HTML) 4 Page - Sipex Corporation |
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4 / 12 page ![]() 4 Date: 05/10/04 SP490/491 Full Duplex RS-485 Transceivers © Copyright 2004 Sipex Corporation Figure 6. Driver Propagation Delays +3V 0V DE 5V VOL A, B 0V 1.5V 1.5V tZL tZH f = 1MHz; tR < 10ns; tF < 10ns VOH A, B 2.3V 2.3V tLZ tHZ 0.5V 0.5V Output normally LOW Output normally HIGH Figure 7. Driver Enable and Disable Times Figure 8. Receiver Propagation Delays +3V +3V 0V DI DI B A DRIVER DRIVER OUTPUT OUTPUT VO+ DIFFERENTIAL DIFFERENTIAL OUTPUT OUTPUT VA – VB 0V VO– 1.5V 1.5V tPLH PLH tR tF f = 1MHz; t f = 1MHz; tR < 10ns; t < 10ns; tFF < 10ns < 10ns VO 1/2V 1/2VO 1/2VO tPHL PHL tDPLH DPLH tDPHL DPHL tSKEW = SKEW = | tDPLH - DPLH - tDPHL DPHL | VOH VOL R 1.5V 1.5V tPHL f = 1MHz; tR < 10ns; tF < 10ns OUTPUT V0D2+ V0D2– A – B 0V 0V tPLH INPUT tSKEW = | tPHL - tPLH | |
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