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SP483CN Datasheet(PDF) 6 Page - Sipex Corporation |
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SP483CN Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 10 page 6 Rev. 07/16/02 SP481/483/485 Low Power Half-Duplex RS485 Transceivers © Copyright 2002 Sipex Corporation Figure 6. Driver Propagation Delays A VOD VOC B R R Figure 1. Driver DC Test Load Circuit Figure 2. Receiver Timing Test Load Circuit Figure 3. Driver/Receiver Timing Test Circuit Figure 4. Driver Timing Test Load #2 Circuit CRL 1K S2 S1 VCC 1K Test Point Receiver Output B A DI B A CL1 CL2 RDIFF DE 3V RO 15pF S2 S1 VCC CL 500 Output Under Test INPUTS OUTPUTS LINE RE DE DI CONDITION B A X1 1 No Fault 0 1 X1 0 No Fault 1 0 X0 X X ZZ X1 X Fault Z Z INPUTS OUTPUTS RE DE A - B R 00 +0.2V 1 00 -0.2V 0 00 Inputs Open 1 10 X Z Table 1. Transmit Function Truth Table Table 2. Receive Function Truth Table +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 VO 1/2VO 1/2V 1/2VO tPHL PHL tDPLH DPLH tDPHL DPHL tSKEW = SKEW = | tDPLH - DPLH - tDPHL DPHL | fSP481/485 SP481/485 = 1MHz; f 1MHz; fSP483 SP483 = 100kHz 100kHz ; tR < 10ns; tF < 10ns < 10ns |
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