ADM3493:  3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver

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 ...More

ADM3493:  3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver

Product 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 fail-safe 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.

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

Diagrams

ADM3493 Diagram
Functional Block Diagram for ADM3493

Specifications

Protocols RS-422,RS-485
Pwr Supply (Vnom) +3.3
#Tx 1
# Rx 1
Data Rate 250kbps
Low Power Shutdown Yes
Operating Temp Range -40 to +85

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