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LTC1387ISW Datasheet(PDF) 7 Page - Linear Technology |
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LTC1387ISW Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1387 BLOCK DIAGRAM RS232 MODE WITHOUT LOOPBACK ON 13 RA C2 C1 RB DY DZ B A VDD VCC 19 20 1 4 2 3 6 7 8 18 16 15 14 Y Z 5 17 GND DXEN 485/232 10 9 LTC1387 • BD RXEN 12 11 VEE RS232 MODE WITH LOOPBACK ON 13 RA C2 C1 RB DY DZ VDD VCC 19 20 1 2 3 6 7 8 18 16 15 14 Y Z 17 GND DXEN* 485/232 10 9 RXEN* 12 11 VEE RS485 MODE WITHOUT LOOPBACK ON 13 RA C2 C1 RB DY SLEW B A VDD VCC 19 20 1 4 2 3 6 7 8 18 16 15 14 Y Z 5 17 GND DXEN 485/232* 10 9 RXEN 12 11 VEE RS485 MODE WITH LOOPBACK ON 13 RA C2 C1 RB DY SLEW VDD VCC 19 20 1 2 3 6 7 8 18 16 15 14 Y Z 17 GND DXEN* 485/232* 10 9 RXEN* 12 11 VEE *485/232, DXEN, RXEN = VCC TEST CIRCUITS Figure 2. RS485 Driver/Receiver Timing Test Circuit Figure 1. RS485 Driver Test Load R R VOD Z Y LTC1387 • F01 VOC RL CL LTC1387 • F02 Z Y CL B R A 15pF D SLEW 485 = 3V, DXEN = 3V, RXEN = 3V Figure 3. RS485 Driver Output Enable/Disable Timing Test Load DR OUT CL 500 Ω S2 LTC1387 • F03 VCC S1 Figure 4. RS232 Driver Timing Test Circuit Figure 6. Receiver Output Enable/Disable Timing Test Load RECEIVER OUT CL 1k S2 LTC1387 • F06 VCC S1 Figure 5. RS232 Receiver Timing Test Circuit LTC1387 • F05 15pF Y, Z D R A, B 232 = 0V, DXEN = 3V, RXEN = 3V RL LTC1387 • F04 Y, Z D CL 232 = 0V, DXEN = 3V |
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