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ADM3491-1

Analog Devices
Part Number ADM3491-1
Manufacturer Analog Devices
Description EIA RS-485 Transceiver
Published Jul 8, 2016
Detailed Description Data Sheet FEATURES Operates with 3.3 V supply EIA RS-422 and RS-485 compliant over full CM range 19 kΩ input impedance ...
Datasheet PDF File ADM3491-1 PDF File

ADM3491-1
ADM3491-1

Overview
Data Sheet FEATURES Operates with 3.
3 V supply EIA RS-422 and RS-485 compliant over full CM range 19 kΩ input impedance Up to 50 transceivers on bus 20 Mbps data rate Short-circuit protection Specified over full temperature range Thermal shutdown Interoperable with 5 V logic 840 μA supply current 2 nA shutdown current Available in PDIP, SOIC, and TSSOP Meets IEC1000-4-4 (>1 kV) 8 ns skew Upgrade for MAX3491, SN75ALS180 3.
3 V, Full-Duplex, 840 μA, 20 Mbps, EIA RS-485 Transceiver ADM3491-1 FUNCTIONAL BLOCK DIAGRAM ADM3491-1 RO R RE A B DE DI D Z Y 05234-001 Figure 1.
APPLICATIONS Telecommunications DTE–DCE interface Packet switching Local area networks Data concentration Data multiplexers Integrated services digital network (ISDN) AppleTalk Industrial controls GENERAL DESCRIPTION The ADM3491-1 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.
It is suitable for communication on multipoint bus transmission lines.
The ADM3491-1 is intended for balanced data transmission and complies with both Electronic Industries Association (EIA) Standards RS-485 and RS-422.
It contains a differential line driver and a differential line receiver, making it suitable for fullduplex data transfer.
The input impedance is 19 kΩ, allowing up to 50 transceivers to be connected on the bus.
A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting.
This feature forces the driver output into a high impedance state if a significant temperature increase is detected in the internal driver circuitry during fault conditions.
If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state.
The ADM3491-1 is fabricated on BiCMOS, an advanced mixed technology process combining low power CMOS with fast switching bipolar technolog...


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