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ADM3493 Dataheets PDF



Part Number ADM3493
Manufacturers Analog Devices
Logo Analog Devices
Description Half Duplex RS-485/RS-422 Transceiver
Datasheet ADM3493 DatasheetADM3493 Datasheet (PDF)

www.DataSheet4U.com 3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver ADM3493 FEATURES Operates with 3.3 V supply Interoperable with 5 V logic EIA RS-422 and RS-485 compliant over full CM range Data rate: 250 kbps Half duplex transceiver Reduced slew rates for low EMI 2 nA supply current in shutdown mode Up to 256 transceivers on a bus −7 V to +12 V bus common-mode range Specified over −40°C to +85°C temperature range 8 ns skew Available in 8-lead SOIC FUNCTIONAL BLOCK DIAGRAM VCC.

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www.DataSheet4U.com 3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver ADM3493 FEATURES Operates with 3.3 V supply Interoperable with 5 V logic EIA RS-422 and RS-485 compliant over full CM range Data rate: 250 kbps Half duplex transceiver Reduced slew rates for low EMI 2 nA supply current in shutdown mode Up to 256 transceivers on a bus −7 V to +12 V bus common-mode range Specified over −40°C to +85°C temperature range 8 ns skew Available in 8-lead SOIC FUNCTIONAL BLOCK DIAGRAM VCC ADM3493 RO RE DE DI D 05715-001 R A B GND Figure 1. APPLICATIONS Low power RS-485 applications EMI sensitive systems DTE-DCE interfaces Industrial control Packet switching Local area networks Level translators GENERAL DESCRIPTION The ADM3493 is a low power, differential line transceiver designed to operate using a single 3.3 V power supply. Low power consumption, coupled with a shutdown mode, makes it ideal for power-sensitive applications. The ADM3493 is suitable for communication on multipoint bus transmission lines. The device contains one driver and one receiver. Designed for half-duplex communication, the ADM3493 features a slew rate limited driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250 kbps. The receiver input impedance is 96 kΩ, allowing up to 256 transceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. If a significant temperature increase is detected in the internal driver circuitry during fault conditions then the thermal shutdown circuit forces the driver output into a high impedance state. The receiver contains a failsafe feature that results in a logic high output state, if the inputs are unconnected (floating). The ADM3493 is fully specified over the commercial and industrial temperature ranges and is available in an 8-lead SOIC. Rev. 0 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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2005 Analog Devices, Inc. All rights reserved. www.DataSheet4U.com ADM3493 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Specifications .................................................................. 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Test Circuits....................................................................................... 7 Switching Characteristics .................................................................8 Typical Performance Characteristics ..............................................9 Circuit Description......................................................................... 11 Reduced EMI and Reflections .................................................. 11 Low Power Shutdown Mode..................................................... 11 Driver Output Protection.......................................................... 11 Propagation Delay ...................................................................... 11 Typical Applications................................................................... 11 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12 REVISION HISTORY 10/05—Rev. 0: Initial Version Rev. 0 | Page 2 of 12 www.DataSheet4U.com ADM3493 SPECIFICATIONS VCC = 3.3 V ±0.3 V, TA = TMIN to TMAX, unless otherwise noted. Table 1. Parameter DRIVER Differential Output Voltage, VOD Min 2.0 1.5 1.5 Δ |VOD| for Complementary Output States 1 Common-Mode Output Voltage, VOC Δ |VOC| for Common-Mode Output Voltage1 DRIVER INPUT L.


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