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MAX3291ESD Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3291ESD Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 16 page RS-485/RS-422 Transceivers with Preemphasis for High-Speed, Long-Distance Communication _______________________________________________________________________________________ 7 Pin Description Preemphasis Enable Input. To enable preemphasis, leave PEE unconnected, connect to VCC, or drive high. To enable strong-level-drive only mode, connect PEE to GND or drive low. PEE 1 — Preemphasis Set Input. Sets the preemphasis interval. Connect a resistor (RPSET) in paral- lel with a capacitor (CPSET) from PSET to VCC to set the preemphasis interval. See Typical Operating Circuit. PSET — 1 Receiver Output Enable. Drive RE low to enable RO; RO is high impedance when RE is high. Drive RE high and DE low to enter low-power shutdown mode. RE 3 3 Receiver Output. When RE is low and if A - B ≥ 200mV, RO is high; if A - B ≤ -200mV, RO is low. RO 2 2 Driver Input. With DE high, a low on DI forces the noninverting output low and the inverting output high. Similarly, a high on DI forces the noninverting output high and the inverting output low. DI 5 5 Ground GND 7 6, 7 No Connection. Not internally connected. N.C. 6, 8, 13 8 Driver Output Enable. Drive DE high to enable the driver outputs. These outputs are high impedance when DE is low. Drive RE high and DE low to enter low-power shutdown mode. DE 4 4 Noninverting Driver Output Y 9 9 Inverting Receiver Input B 11 11 Connect to VCC VCCD — 13 Noninverting Receiver Input A 12 12 Inverting Driver Output Z 10 10 PIN MAX3291 FUNCTION NAME MAX3292 R R Y Z VOD VODP VOC Figure 1. Driver DC Test Load OUTPUT UNDER TEST RL S1 S2 VCC CL Figure 2. Driver or Receiver Enable/Disable Timing Test Load Positive Supply: +4.75V ≤ VCC ≤ +5.25V VCC 14 14 |
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