ISO1430DWR datasheet(24/49 Pages) TI2

24 / 49 page

9 Detailed Description

9.1 Overview

The ISO14xx devices are isolated RS-485/RS-422 transceivers designed to operate in harsh industrial

environments. ISO141x, ISO143x and ISO145x devices support up to 500 kbps, 12 Mbps and 50 Mbps signaling

rates respectively. This family of devices has a 3-channel digital isolator and an RS-485 transceiver in a 16-pin

wide-body SOIC package. The silicon-dioxide based capacitive isolation barrier supports an isolation withstand

voltage of 5 kVRMS and an isolation working voltage of 1500 VPK. Isolation breaks the ground loop between

the communicating nodes and allows for data transfer in the presence of large ground potential differences.

These devices have a higher typical differential output voltage (VOD) than traditional transceivers for better noise

immunity. A minimum differential output voltage of 2.1 V is specified at a VCC2 voltage of 5 V ±10% which

meets the requirements for Profibus applications. The wide logic supply of the device (VCC1) supports interfacing

with 1.8-V, 2.5-V, 3.3-V, and 5-V control logic. The 3-V to 5.5-V bus side supply (VCC2) removes the need of a

well-regulated isolated supply in end systems. Figure 9-1 shows the functional block diagram of the full-duplex

devices and Figure 9-2 shows the functional block diagram of a half-duplex devices.

9.2 Functional Block Diagram

Full duplex

VCC1

GND1

VCC2

GND2

VCC

GND2

VCC2

Figure 9-1. Full-Duplex Block Diagram

Half duplex

VCC1

GND1

VCC2

GND2

VCC

GND2

VCC2

Figure 9-2. Half-Duplex Block Diagram

ISO1450, ISO1452, ISO1410, ISO1412, ISO1430, ISO1432

SLLSF22H – APRIL 2018 – REVISED JUNE 2024

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Product Folder Links: ISO1450 ISO1452 ISO1410 ISO1412 ISO1430 ISO1432

ISO1430DWR Datasheet(PDF) 24 Page - Texas Instruments