ISL31490E

±60V Fault Protected, 5V, RS-485/RS-422 Transceivers with ±25V Common Mode Range

Product Status: Mass Production

OVERVIEW

The ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E, ISL31498E are fault protected, 5V powered, differential transceivers that exceed the RS-485 and RS-422 standards for balanced communication. The RS-485 transceiver pins (driver outputs and receiver inputs) are protected against faults up to ±60V. Additionally, the extended common mode range allows these transceivers to operate in environments with common mode voltages up to ±25V (>2x the RS-485 requirement), making this RS-485 family one of the most robust on the market.

Transmitters deliver an exceptional 2.5V (typical) differential output voltage into the RS-485 specified 54Ω load. This yields better noise immunity than standard RS-485 ICs, or allows up to six 120Ω terminations in star network topologies.

Receiver (Rx) inputs feature a “Full Fail-safe” design, which ensures a logic high Rx output if Rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. Rx outputs have high drive levels - typically 15mA at VOL = 1V (for opto-coupled, isolated applications).

Half duplex (Rx inputs and Tx outputs multiplexed together) and full duplex pinouts are available. See Table 1 on page 3 for key features and configurations by device number. For fault protected or wide common mode range devices with cable invert (polarity reversal) please see the ISL32485E datasheet.

KEY FEATURES

  • Fault protected RS-485 bus pins: up to ±60V
  • Extended common mode range: ±25V More than twice the range required for RS-485
  • 1/4 unit load for up to 128 devices on the bus
  • High transient overvoltage tolerance: ±80V
  • Full fail-safe (open, short, terminated) RS-485 receivers
  • High Rx IOL for opto-couplers in isolated designs
  • Hot plug circuitry - Tx and Rx outputs remain three-state during power-up/power-down
  • Choice of RS-485 data rates: 250kbps to 15Mbps
  • Low quiescent supply current: 2.3mA
  • Ultra low shutdown supply current: 10μA
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL31490E
Basic Information
Production Status
Mass Production
# of Tx
1
# of Rx
1
Fault Voltage Level
±60 V
Common Mode Voltage Range
±25 V
Devices Allowed on Bus
128
Half/Full Duplex
Full
High ESD Protection
No
Hot Plug
Yes
Data Rate
0.25 Mbps
Supply Voltage Vcc (Min) (V)
4.5
Slew Rate Limited
Yes
Tx/Rx Enable
Yes
Supply Current Icc
2.3 mA
SHDN ICC
50 µA
VL Pin
No
Qualification Level
Standard
Supply Voltage Vcc (Max) (V)
5.5
Supply Voltage Vcc Range (V)
4.5 to 5.5
Can Sample
YES
Temperature Range
-40 to +85

Action Needed