1 Isolated RS-485 Transceiver Reference Design

This design note presents the reference designs of isolated RS-485 nodes using isolated RS-485 transceivers and a transformer driver, SN6505B. Table 1-1 lists featured isolated RS-485 transceivers from Texas Instruments.

Table 1-1 Isolated RS-485 Transceivers

Device	Transmission	Data Rate [Mbps]	Maximum Transient Isolation Voltage [Vrms]	Primary-Supply Voltage Range [V]	Secondary-Supply Voltage Range [V]	Package Size [mm]
ISO1500	Half-duplex	1	3000	1.71 to 5.5	4.5 to 5.5	4.90 x 3.90
ISO1410		0.5	5000	1.71 to 5.5	3.0 to 5.5	10.30 x 7.50
ISO1430		12	5000	1.71 to 5.5	3.0 to 5.5	10.30 x 7.50
ISO1450		50	5000	1.71 to 5.5	3.0 to 5.5	10.30 x 7.50
ISO1412	Full-duplex	0.5	5000	1.71 to 5.5	3.0 to 5.5	10.30 x 7.50
ISO1432		12	5000	1.71 to 5.5	3.0 to 5.5	10.30 x 7.50
ISO1452		50	5000	1.71 to 5.5	3.0 to 5.5	10.30 x 7.50