Datasheet SP483, SP485 (MaxLinear) - 7

FUNCTION TRUTH TABLES INPUTS OUTPUTS LINE INPUTS OUTPUTS RE DE DI CONDITION A B RE DE A - B R
X 1 1 No Fault 1 0 0 0 +0.2V 1 X 1 0 No Fault 0 1 0 0 -0.2V 0 X 0 X X Z Z 0 0 Inputs Open 1 X 1 X Fault Z Z 1 0 X Z Table 1. Transmit Function Truth Table Table 2. Receive Function Truth Table
SWITCHING WAVEFORMS
fSP485 = 1MHz; fSP483 = 100kHz; tR ≤ 10ns; tF ≤ 10ns +3V DE 1.5V 1.5V 0V tZL tLZ 5V A, B 2.3V Output normally LOW V 0.5V OL VOH A, B 2.3V Output normally HIGH 0.5V 0V tZH tHZ Figure 6. Driver Enable and Disable Times VOD2+ A – B 0V 0V V – INPUT OD2 VOH R 1.5V 1.5V V OUTPUT OL tPHL tPLH fSP485 = 1MHz; fSP483 = 100kHz; tR ≤ 10ns; tF ≤ 10ns tSKEW = |tPLH - tPHL| Figure 7. Receiver Propagation Delays fSP485 = 1MHz; fSP483 = 100kHz; tR ≤ 10ns; tF ≤ 10ns +3V RE 1.5V 1.5V 0V tZL tLZ 5V R 1.5V Output normally LOW 0.5V VIL VIH R 1.5V Output normally HIGH 0.5V 0V tZH tHZ Figure 8. Receiver Enable and Disable Times 236DSR00 7 Rev. 1.0.3