Complete, Isolated, 3.3V

RS-485/RS-422 Data Interface

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7

______________________________________________________________Pin Description

Driver Input. With DE

forces output A high and output B low. Drives internal LED cathode through R1 (Table 1 of Figure 2).

DI

9

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 2, and 14.

10

Boosted V+ Voltage Input. Must be connected as shown in Figures 1 and 2.

8

(normal connection).

FS

6

Boost-Voltage Generator Outputs. See Figures 1 and 2.

D1, D2

Logic-Side Ground Inputs. Must be connected; not internally connected.

GND1,

GND2

2

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 10, and 14.

5, 12

PIN

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 2, 10, and 14.

1

3, 4

FUNCTION

NAME

Driver-Enable Input. The driver outputs, A and B, are enabled by bringing DE

are high impedance when DE

driver. While the driver outputs are high impedance, the device functions as a line receiver. Drives

internal LED cathode through R2 (Table 1 of Figure 2).

DE

11

Receiver Output. If A > B by 200mV, RO will be low; if A < B by 200mV, RO will be high. Open collector;

RO

13

Logic-Side (non-isolated side) +3.3V Supply Voltage Input. Connect to pins 1, 2, and 10.

14

Power-Supply Shutdown Input. Must be connected to logic ground.

SD

7

PINS ON THE NON-ISOLATED SIDE