500 kbps, ESD Protected, Half-/Full-Duplex, iCoupler, Isolated RS-485 Transceiver Data Sheet ADM2484E FEATURES FUNCTIONAL BLOCK DIAGRAM V V DD1 DD2 Isolated, RS-485/RS-422 transceiver, configurable as half- or full-duplex ADM2484E 15 kV ESD protection on RS-485 input/output pins DE 500 kbps data rate Complies with ANSI TIA/EIA RS-485-A-1998 and Y ISO 8482: 1987(E) TxD Suitable for 5 V or 3.3 V operation (V ) Z DD1 High common-mode transient immunity: >25 kV/s A True fail-safe receiver inputs RxD 256 nodes on the bus B RE Thermal shutdown protection Safety and regulatory approvals GND GND 1 2 UL recognition Figure 1. 5000 V rms isolation voltage for 1 minute per UL1577 VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 Reinforced insulation, V = 849 V IORM PEAK CSA Component Acceptance Notice 5A IEC 60950-1: 390 V rms (reinforced) Operating temperature range: 40C to +85C Wide body, 16-lead SOIC package APPLICATIONS Isolated RS-485/RS-422 interfaces Industrial field networks INTERBUS Multipoint data transmission systems GENERAL DESCRIPTION The ADM2484E is an isolated data transceiver with 15 kV The differential transmitter outputs and receiver inputs feature ESD protection suitable for high speed, half- or full-duplex electrostatic discharge circuitry that provides protection up to communication on multipoint transmission lines. For half- 15 kV using the human body model (HBM). The logic side of duplex operation, the transmitter outputs and receiver inputs the device can be powered with either a 5 V or a 3.3 V supply, share the same transmission line. Transmitter Output Pin Y whereas the bus side requires an isolated 3.3 V supply. links externally to Receiver Input Pin A, and Transmitter The device has current-limiting and thermal shutdown features Output Pin Z links externally to Receiver Input Pin B. to protect against output short circuits and situations where bus Designed for balanced transmission lines, the ADM2484E contention causes excessive power dissipation. complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E). The device employs Analog Devices, Inc., iCoupler technology to combine a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. Rev. G Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20082018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. GALVANIC ISOLATION 06984-001ADM2484E Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits ..................................................................................... 10 Applications ....................................................................................... 1 Switching Characteristics .............................................................. 11 Functional Block Diagram .............................................................. 1 Circuit Description......................................................................... 12 General Description ......................................................................... 1 Electrical Isolation ...................................................................... 12 Revision History ............................................................................... 2 Truth Tables................................................................................. 12 Specifications ..................................................................................... 3 Thermal Shutdown .................................................................... 13 Timing Specifications .................................................................. 4 True Fail-Safe Receiver Inputs .................................................. 13 Package Characteristics ............................................................... 4 Magnetic Field Immunity .......................................................... 13 Regulatory Information ............................................................... 4 Applications Information .............................................................. 14 Insulation and Safety-Related Specifications ............................ 5 Isolated Power Supply Circuit .................................................. 14 VDE 0884 Insulation Characteristics ........................................ 5 PC Board Layout ........................................................................ 14 Absolute Maximum Ratings ............................................................ 6 Typical Applications ................................................................... 15 ESD Caution .................................................................................. 6 Outline Dimensions ....................................................................... 16 Pin Configuration and Function Descriptions ............................. 7 Ordering Guide .......................................................................... 16 Typical Performance Characteristics ............................................. 8 11/2010Rev. B to Rev. C REVISION HISTORY Changes to Features Section ............................................................ 1 5/2018Rev. F to Rev. G Changes to Table 4 ............................................................................. 4 Change to Features Section ............................................................. 1 Change to Maximum Working Insulation Voltage Parameter, Changes to Table 4 ............................................................................ 4 Table 6 .................................................................................................5 Changes to Figure 30 and Figure 31............................................. 15 11/2015Rev. E to Rev. F Updated Outline Dimensions ....................................................... 16 Added Table 8 Renumbered Sequentially .................................... 6 Changes to Ordering Guide .......................................................... 16 3/2015Rev. D to Rev. E 3/2010Rev. A to Rev. B Changes to CTI Value and Isolation Group, Table 5 ................... 5 Changes to Minimum External Tracking (Creepage) Parameter, Table 5 .................................................................................................5 3/2014Rev. C to Rev. D Changes to Features Section............................................................ 1 3/2009Rev. 0 to Rev. A Changed VIORM from 846 VPEAK to 849 VPEAK, Table 4 .................. 4 Changes to Figure 28 ...................................................................... 14 Changes to VDE 0884 Insulation Characteristics Section .......... 5 Additional T Junction Temperature of 110C, Table 7 ............... 6 J 5/2008Revision 0: Initial Version Rev. G Page 2 of 16