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ADM1486JR 데이터시트(PDF) 1 Page - Analog Devices |
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ADM1486JR 데이터시트(HTML) 1 Page - Analog Devices |
1 / 8 page REV Pr. B 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a +5 V Low Power RS-485PROFIBUSTransceiver FUNCTIONAL BLOCK DIAGRAM FEATURES Meets & Exceeds EIA RS-485 & EIA RS-422 Standard 50 Mb/s Data Rate Recommended for PROFIBUS Applications 2.1V Minimum Differential Output with 54 Termination Low Power 0.5mA ICC Thermal Shutdown & Short Circuit Protection Zero Skew Driver & Receiver Driver Propagation Delay: 8 ns Receiver Propagation Delay: 12 ns High Z Outputs with Drivers Disabled or Power Off Superior Upgrade for SN65ALS1176 15kV HBM ESD Protection on I/O Pins A & B Available in Standard 8-pin SOIC & Miniature 8-pin Micro SOIC packages APPLICATIONS Industrial Field Equipment One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 RO RE DE DI R D A B GND VCC ADM1486 GENERAL DESCRIPTION The ADM1486 is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced data transmission, complies with EIA Standards RS-485 and RS-422 and is recommended for PROFIBUS applications. The part contains a differential line driver and a differential line receiver. Both the driver and the receiver may be enabled independently. When disabled or with power off, the driver outputs are tristated. The ADM1486 operates from a single +5 V power supply. Excessive power dissipation caused by bus contention or by output shorting is prevented by a thermal shutdown circuit. This feature forces the driver output into a high impedance state if during fault conditions a significant temperature increase is detected in the internal driver circuitry. Up to 50 transceivers may be connected simultaneously on a bus, but only one driver should be enabled at any time. It is important therefore that the remaining disabled drivers do not load the bus. To ensure this, the ADM1486 driver features high output impedance when disabled and also when powered down. This minimizes the loading effect when the transceiver is not being utilized. The high impedance driver output is maintained over the entire common-mode voltage range from –7 V to +12 V. The receiver contains a fail safe feature which results in a logic high output state if the inputs are unconnected (floating). The ADM1486 is fabricated on BiCMOS, an advanced mixed technology process combining low power CMOS with fast switching bipolar technology. All inputs and outputs contain protection against ESD; all driver outputs feature high source and sink current capability. An epi- taxial layer is used to guard against latch-up. The ADM1486 features extremely fast switching speeds. Minimal driver propagation delays permit transmission at data rates up to 50 Mbits/s while low skew minimizes EMI interference. The part is fully specified over the commercial and indus- trial temperature range and is available in an 8-lead DIL/SOIC/µSOIC package. Preliminary Technical Data ADM1486 PRELIMINARY TECHNICAL DATA |
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