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LTC1485C Datasheet(PDF) 7 Page - Linear Technology |
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LTC1485C Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1485 TI E WAVEFOR S G WITCHI S Figure 9. Typical Connection 1.5V 0V tZL f = 1MHz; tr ≤ 10ns; tf ≤ 10ns VOL 3V VOH 1485 F08 1.5V tZH RO RO 1.5V tLZ 0.5V 0.5V tHZ OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH 1.5V 0V 5V RE Figure 8. Receiver Enable and Disable Times S APPLICATI I FOR ATIO Typical Application A typical connection of the LTC1485 is shown in Figure 9. Two twisted pair wires connect up to 32 driver/receiver pairs for half duplex data transmission. There are no restrictions on where the chips are connected to the wires and it isn’t necessary to have the chips connected at the ends. However, the wires must be terminated only at the ends with a resistor equal to their characteristic imped- ance, typically 120 Ω. The input impedance of a receiver is typically 20k to GND, or 0.6 unit RS485 load, so in practice 50 to 60 transceivers can be connected to the same wires. The optional shields around the twisted pair help reduce unwanted noise, and are connected to GND at one end. 8 7 120 Ω 120 Ω 3 4 RX DX 2 1 1485 F09 LTC1485 RX DX 4 1 3 2 LTC1485 RECEIVER RX DX 7 4 1 3 2 LTC1485 8 RECEIVER DRIVER RECEIVER DRIVER DRIVER |
Similar Part No. - LTC1485C |
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Similar Description - LTC1485C |
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