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SP3494 Datasheet(PDF) 7 Page - Sipex Corporation |
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SP3494 Datasheet(HTML) 7 Page - Sipex Corporation |
7 / 11 page 7 10/16/02 SP3493/3494 +3.3V Low Power Slew-Rate Limited RS-485/RS-422 Transceivers © Copyright 2002 Sipex Corporation 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 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 Figure 1. Driver DC Test Load Circuit Figure 7. Receiver Enable and Disable Timing Circuit R R VOC D VCC VOD GENERATOR (NOTE 1) 50Ω VCC S1 VDM RL = 27Ω OUT CL = 15pF (NOTE 2) VOM = 1.5V VOH + VOL 2 D GENERATOR (NOTE 1) 50Ω S1 RL = 110Ω OUT CL = 50pF (NOTE 2) VOM = 1.5V VOH + VOL 2 D GENERATOR (NOTE 1) 50Ω S1 RL = 110Ω OUT CL = 50pF (NOTE 2) D 0V OR 3V VCC GENERATOR (NOTE 1) 50Ω 1.5V 0V VID R OUT CL = 15pF (NOTE 2) VOM = VCC 2 1.5V -1.5V S3 VID GENERATOR (NOTE 1) 50Ω CL = 15pF (NOTE 2) R 1k S1 S2 VCC Figure 5. Driver Enable and Disable Timing Circuit, Output LOW GENERATOR (NOTE 1) 50Ω CL OUT D VCC RL = 60Ω CL = 15pF (NOTE 2) Figure 3. Driver Differential Output Delay and Transition Time Circuit Figure 2. Driver Propagation Delay Test Circuit Figure 6. Receiver Propagation Delay Test Circuit Figure 4. Driver Enable and Disable Timing Circuit, output HiGH |
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