Datasheet SP483, SP485 (MaxLinear) - 6

PIN FUNCTION
Pin 1 - RO - Receiver Output Pin 2 - RE - Receiver Output Enable Active LOW Pin 3 - DE - Driver Output Enable Active HIGH Pin 4 - DI - Driver Input Pin 5 - GND - Ground Connection Pin 6 - A - Driver Output / Receiver input Non-Inverting Pin 7 - B - Driver Output / Receiver Input Inverting Pin 8 - Vcc - Positive Supply 4.75V ≤ Vcc ≤ 5.25V
TEST CIRCUITS
A 1kΩ Receiver Test Point R Output S V 1 CC VOD CRL 1kΩ R VOC B S2 Figure 1. Driver DC Test Load Circuit Figure 2. Receiver Timing Test Load Circuit C VCC L1 A S A 1 DI R 500Ω Output L RO B B Under CL2 15pF Test CL S2 Figure 3. RS-485 Driver/Receiver Timing Test Figure 4. Driver Timing Test Load #2 Circuit fSP485 = 1MHz; fSP483 = 100kHz; tR ≤ 10ns; tF ≤ 10ns +3V DRIVER INPUT 1.5V 1.5V 0V tPLH tPHL B DRIVER V 1/2V O O 1/2VO OUTPUT A tDPLH tDPHL VO+ DIFFERENTIAL OUTPUT 0V VA – VB VO– t t R F t SKEW = |t DPLH - tDPHL| Figure 5. Driver Propagation Delays 236DSR00 6 Rev. 1.0.3