ISL31490E_10 Datasheet, PDF (1/27 Pages) Intersil Corporation – ±60V Fault Protected, 5V, RS-485/RS-422 Transceivers with ±25V Common Mode Range

±60V Fault Protected, 5V, RS-485/RS-422
Transceivers with ±25V Common Mode Range
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E,
ISL31496E, ISL31498E
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
@ V_OL = 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 2 for key features and configurations by
device number.
For fault protected or wide common mode range devices
with cable invert (polarity reversal) or logic supply (V_L)
pins, please see the ISL31480E data sheet.
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 I_OL 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)
Applications
• Utility Meters/Automated Meter Reading Systems
• High Node Count Systems
• PROFIBUS™ and Field Bus Networks, and Factory
Automation
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks
Exceptional Rx Operates at
>15Mbps Even with a ±25V
Common Mode Voltage
30
B
25
A
20
VID = ±1V
15
10
5
RO
0
-5
TIME (20ns/ DIV)
ISL3149xE Delivers Superior
Common Mode Range vs
Standard RS-485 Devices
25
12
0
-7
-12
-20
-25
STANDARD RS-485 CLOSEST
TRANSCEIVER COMPETITOR
ISL3149xE
June 17, 2010
FN7637.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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