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ADM3493

Analog Devices
Part Number ADM3493
Manufacturer Analog Devices
Description Half Duplex RS-485/RS-422 Transceiver
Published Nov 8, 2006
Detailed Description www.DataSheet4U.com 3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver ADM3493 FEATURES Operates with 3.3 V...
Datasheet PDF File ADM3493 PDF File

ADM3493
ADM3493

Overview
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.
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