Top

Complete, Isolated RS-485/RS-422 Data Interface

Product Details

Key Features

Applications/Uses

Parametric specs for RS-485/RS-422 Line Driver/Receivers
# Tx/Rx 1Tx + 1Rx
Duplex Half
VSUPPLY (V) 5
Data Rate (kbps) (min) 250
Galvanic Isolation (±V) 1000
ICC (mA) (typ) 35
Tx EN Yes
Rx EN No
ICC (Shutdn.) (µA) (typ) 0.2
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins PDIP HYBRID/28
Budgetary
Price (See Notes)
15.39
View More

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Parameters

Parametric specs for RS-485/RS-422 Line Driver/Receivers
# Tx/Rx 1Tx + 1Rx
Duplex Half
VSUPPLY (V) 5
Data Rate (kbps) (min) 250
Galvanic Isolation (±V) 1000
ICC (mA) (typ) 35
Tx EN Yes
Rx EN No
ICC (Shutdn.) (µA) (typ) 0.2
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins PDIP HYBRID/28
Budgetary
Price (See Notes)
15.39

Key Features

  • For Integrated ESD Protection
    • MAX1480E/MAX1490E: ±15kV ESD-Protected, Isolated RS-485/RS-422 Data Interfaces
  • For Space-Constrained Applications
    • MAX3157: High CMRR, RS-485 Transceiver with ±50V Isolation

Applications/Uses

  • Automated Test Equipment (ATE)
  • HVAC/Building Control Networks
  • Industrial-Control Local Area Networks
  • Isolated RS-485/RS-422 Data Interface
  • Transceivers for EMI-Sensitive Applications

Description

The MAX1480A/MAX1480B/MAX1480C/MAX1490A/MAX1490B are complete, electrically isolated, RS-485/RS-422 data-communications interface solutions in a hybrid microcircuit. Transceivers, optocouplers, and a transformer provide a complete interface in a standard DIP package. A single +5V supply on the logic side powers both sides of the interface.

The MAX1480B/MAX1480C/MAX1490B feature reduced-slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The MAX1480A/MAX1490A driver slew rate is not limited, allowing transmission rates up to 2.5Mbps. The MAX1480A/B/C are designed for half-duplex communication, while the MAX1490A/B feature full-duplex communication.

Drivers are short-circuit current limited and protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a known output (active-low RO low for the MAX1480A/B/C, RO high for the MAX1490A/B) if the input is open circuit.

The MAX1480A/MAX1480B/MAX1480C/MAX1490A/MAX1490B typically withstand 1600VRMS (1 minute) or 2000VRMS (1 second). Their isolated outputs meet all RS-485/RS-422 specifications. The MAX1480A/B/C are available in a 28-pin DIP package, and the MAX1490A/B are available in a 24-pin DIP package.

Simplified Block Diagram

MAX1490A, MAX1490B: Pin Configuration MAX1490A, MAX1490B: Pin Configuration Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .