B B 3.3 V, 15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E FEATURES FUNCTIONAL BLOCK DIAGRAMS V TIA/EIA RS-485/RS-422 compliant CC 15 kV ESD protection on RS-485 input/output pins ADM3483E/ Data rates ADM3486E ADM3483E/ADM3488E: 250 kbps R RO ADM3486E: 2.5 Mbps RE A ADM3490E/ADM3491E: 12 Mbps DE B Half- and full-duplex options DI D Up to 32 nodes on the bus Receiver open-circuit, fail-safe design Low power shutdown current GND (ADM3483E/ADM3486E/ADM3491E only) Figure 1. Outputs high-Z when disabled or powered off V CC Common-mode input range: 7 V to +12 V ADM3488E/ Thermal shutdown and short-circuit protection ADM3490E Industry-standard 75176 pinout A RO R 8-lead and 14-lead narrow SOIC packages APPLICATIONS Power/energy metering Z DI D Y Telecommunications EMI-sensitive systems GND Industrial control Figure 2. Local area networks V CC GENERAL DESCRIPTION The ADM3483E/ADM3486E/ADM3488E/ADM3490E/ ADM3491E ADM3491E are 3.3 V, low power data transceivers with A RO R 15 kV ESD protection suitable for full- and half-duplex RE communication on multipoint bus transmission lines. They DE are designed for balanced data transmission, and they Z comply with TIA/EIA standards RS485 and RS-422. The DI D Y ADM3483E/ADM3486E are half-duplex transceivers that share differential lines and have separate enable inputs for GND the driver and receiver. The full-duplex ADM3488E/ Figure 3. ADM3490E/ADM3491E transceivers have dedicated differential line driver outputs and receiver inputs. The ADM3491E also features separate enable inputs for the driver and receiver. The devices have a 12 k receiver input impedance, which allows up to 32 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus. (continued on Page 3) Rev. A 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 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06284-001 06284-003 06284-002ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E TABLE OF CONTENTS Features .............................................................................................. 1 Devices Without Receiver/Driver Enable ADM3488E/ ADM3490E ................................................................................. 14 Applications....................................................................................... 1 Low Power Shutdown ModeADM3483E/ ADM3486E/ General Description ......................................................................... 1 ADM3491E ................................................................................. 14 Functional Block Diagrams............................................................. 1 Driver Output Protection.......................................................... 14 Revision History ............................................................................... 2 Propagation Delay...................................................................... 14 Specifications..................................................................................... 4 Line Length vs. Data Rate ......................................................... 14 Driver Timing Specifications...................................................... 5 15 kV ESD Protection ............................................................. 15 Receiver Timing Specifications .................................................. 6 Human Body Model .................................................................. 15 Absolute Maximum Ratings............................................................ 7 Typical Applications................................................................... 15 ESD Caution.................................................................................. 7 Outline Dimensions....................................................................... 18 Pin Configurations and Function Descriptions ........................... 8 Ordering Guide .......................................................................... 18 Test Circuits and Switching Characteristics.................................. 9 Typical Performance Characteristics ........................................... 11 Circuit Description......................................................................... 14 Devices with Receiver/Driver EnableADM3483E/ ADM3486E/ ADM3491E ........................................................... 14 REVISION HISTORY 10/06Rev. 0 to Rev. A Added ADM3483E and ADM3488E ...............................Universal Changes to Figure 1 and Figure 2................................................... 1 Inserted Table 3................................................................................. 5 Changes to Figure 4 and Figure 5................................................... 8 Inserted Figure 28 and Figure 29.................................................. 13 Changes to Figure 31 and Figure 32............................................. 16 Changes to Figure 34...................................................................... 17 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 18 8/06Revision 0: Initial Version Rev. A Page 2 of 20