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Description
The ADM485 is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced data transmission and complies with both EIA Standards RS-485 and RS-422. The part contains a differential line driver and a differential line receiver. Both the driver and the receiver may be enabled independently. When disabled, the outputs are tristated. The ADM485 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.
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FEATURES
● Meets EIA RS-485 standard
● 5 Mbps data rate
● Single 5 V supply
● -7 V to +12 V bus common-mode range
● High speed, low power BiCMOS
● Thermal shutdown protection
● Short-circuit protection
● Driver propagation delay: 10 ns typical
● Receiver propagation delay: 15 ns typical
● High-Z outputs with power off
● Superior upgrade for LTC485
APPLICATIONS
● Low power RS-485 systems
● DTE/DCE interface
● Packet switching
● Local area networks (LNAs)
● Data concentration
● Data multiplexers
● Integrated services digital network (ISDN)
Preview of the first 3 pages of the data sheet
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Meets EIA RS-485 standard 5 Mbps data rate Single 5 V supply +12 V bus common-mode range High speed, low power BiCMOS Thermal shutdown protection Short-circuit protection Driver propagation delay: 10 ns typical Receiver propagation delay: 15 ns typical High-Z outputs with power off Superior upgrade for LTC485
APPLICATIONSLow power RS-485 systems DTE/DCE interface Packet switching Local area networks (LNAs) Data concentration Data multiplexers Integrated services digital network (ISDN)
The is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced data transmission and complies with EIA standards RS-485 and RS-422. The part contains a differential line driver and a differential line receiver. Both the driver and the receiver can be enabled independently. When disabled, the outputs are three-stated.
The ADM485 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. If during fault conditions, a significant temperature increase is detected in the internal driver circuitry, this feature forces the driver output into a high impedance state.
to 32 transceivers can 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 ADM485 driver features high output impedance when disabled and when powered down, which minimizes the loading effect when the transceiver is not being used. The high impedance driver output is maintained over the common-mode voltage range +12 V.
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.
The receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
The ADM485 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 epitaxial layer is used to guard against latch-up.
The ADM485 features extremely fast switching speeds. Minimal driver propagation delays permit transmission at data rates to 5 Mbps while low skew minimizes EMI interference.
The part is fully specified over the commercial and industrial temperature range and is available in 8-lead PDIP, 8-lead SOIC, and small footprint, 8-lead MSOP packages.
Fax: 781.461.3113 ©19932008 Analog Devices, Inc. All rights reserved.ESD Caution : 5 Pin Configuration and Function Descriptions : 6 Typical Performance Characteristics : 7
E to Rev. F Updated Format : Universal Changes to Table : 4 Updated Outline Dimension : 13 Changes to Ordering Guide D to Rev. E Changes to Timing Specifications : 2 Updated Ordering Guide C to Rev. D Changes to Absolute Maximum Ratings : 3 Changes to Ordering Guide : 3 Update to Outline Dimensions : 9
Test Circuits : 10 Switching Characteristics : 11 Applications Information : 12Differential Data Transmission : 12 Cable and Data Rate : 12 Thermal Shutdown : 12 Propagation Delay : 12 Receiver Open Circuit, Fail-Safe : 12 Outline Dimensions : 13 Ordering Guide : 14
B to Rev. C. Change to Specifications : 2 Change to Ordering Guide A to Rev. B. Deleted Q-8 Package : Universal Edits to Features : 1 Edits to General Description : 1 Edits, additions to Specifications : 2 Edits, additions to Absolute Maximum Ratings : 3 Additions to Ordering Guide : 3 TPCs Updated and Reformatted : 5 Addition of 8-Lead MSOP Package : 9 Update to Outline Dimensions : 9
SPECIFICATIONSVOD3 |VOD| for Complementary Output States Common-Mode Output Voltage, VOC |VOD| for Complementary Output States Output Short-Circuit Current, VOUT = High Output Short-Circuit Current, VOUT = Low CMOS Input Logic Threshold Low, VINL CMOS Input Logic Threshold High, VINH Logic Input Current (DE, DI) RECEIVER Differential Input Threshold Voltage, VTH Input Voltage Hysteresis, VTH Input Resistance Input Current (A, B)
CMOS Input Logic Threshold Low, VINL CMOS Input Logic Threshold High, VINH Logic Enable Input Current (RE) CMOS Output Voltage Low, VOL CMOS Output Voltage High, VOH Short-Circuit Output Current Three-State Output Leakage Current POWER SUPPLY CURRENT ICC, Outputs Enabled ICC, Outputs Disabled
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10000 buyer reviews from United States
Christopher Wilson
Length of registration:7 years
Thank you for providing the ADM485JRZ-REEL electronic component. We are very pleased with the qu and performance of the product. We appreciate your timely delivery and excellent customer service.
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03/17/2023
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ADM485JRZ
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