ISL32450E Datasheet, PDF (1/21 Pages) Intersil Corporation – ±60V Fault Protected, 3.3V to 5V, ±20V Common Mode Range, RS-485/RS-422 Transceivers with Cable Invert and ±15kV ESD

±60V Fault Protected, 3.3V to 5V, ±20V Common Mode
Range, RS-485/RS-422 Transceivers with Cable Invert
and ±15kV ESD
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
The ISL32450E through ISL32457E are 3.3V to 5V powered, fault
protected, extended common mode range differential transceivers
for balanced communication. The RS-485 bus pins (driver outputs
and receiver inputs) are protected against overvoltages up to
±60V, and against ±15kV ESD strikes. These transceivers operate
in environments with common mode voltages up to ±20V
(exceeds the RS-485 requirement), making this RS-485 family
one of the more robust on the market.
Features
• Fault Protected RS-485 Bus Pins . . . . . . . . . . . . . . Up to ±60V
• Extended Common Mode Range . . . . . . . . . . . . . . . . . . . ±20V
Larger Than Required for RS-485
• ±15kV HBM ESD Protection on RS-485 Bus Pins
• Wide Supply Range . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 5.5V
Transmitters are RS-485 compliant with V_CC ≥ 4.5V and deliver a
1.1V differential output voltage into the RS-485 specified 54Ω
load even with V_CC = 3V.
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 full fail-safe operation
is maintained even when the Rx input polarity is switched (cable
invert function on ISL32457E).
The ISL32457E includes a cable invert function that reverses the
polarity of the Rx and Tx bus pins in case the cable is
misconnected during installation.
• Cable Invert Pin (ISL32457E Only)
Corrects for Reversed Cable Connections While Maintaining Rx
Full Fail-safe Functionality
• 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
• Choice of RS-485 Data Rates . . . . . . . . . . . . 250kbps or 1Mbps
• Low Quiescent Supply Current . . . . . . . . . . . . . . . . . . . 2.1mA
Ultra Low Shutdown Supply Current . . . . . . . . . . . . . . . 10µA
• Pb-Free (RoHS Compliant)
See Table 1 on page 2 for key features and configurations by
device number.
Related Literature
Applications
• Utility Meters/Automated Meter Reading Systems
• Air Conditioning Systems
• See FN7784, “ISL32470E, ISL32472E, ISL32475E,
ISL32478E: Fault Protected, Extended Common Mode Range,
RS-485/RS-422 Transceivers with ±16.5kV ESD”
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks
A
20
B
15
10
5
RO
0
V_CC = 3V
VID = ±1V
2Mbps
TIME (200ns/DIV)
FIGURE 1. EXCEPTIONAL ISL32453E RX OPERATES AT >1Mbps
EVEN WITH ±20V COMMON MODE VOLTAGE
20
12
0
-7
-20
STANDARD RS-485
TRANSCEIVER
ISL3245XE
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON MODE
RANGE vs STANDARD RS-485 DEVICES
February 20, 2012
1
FN7921.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.