DATASHEET
ISL32490E, ISL32492E, ISL32493E, ISL32495E, ISL32496E, ISL32498E
±60V Fault Protected, 5V, RS-485/RS-422 Transceivers with ±25V CMR and ESD Protection
FN7786
Rev.6.00
Feb 8, 2019
The ISL32490E, ISL32492E, ISL32493E, ISL32495E,
Features
ISL32496E, and ISL32498E are fault protected, 5V powered,
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±60V
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 fault protected up to
±60V and are protected against ±16.5kV ESD strikes without
latch-up. Additionally, the extended Common-Mode Range
(CMR) allows these transceivers to operate in environments with
common-mode voltages up to ±25V (>2x the RS-485
requirement), making this fault protected RS-485 family one of
the most robust on the market.
• Extended CMR . . . . . . . . . . ±25V (more than twice the range
required for RS-485)
• ±16.5kV HBM ESD protection on RS-485 bus pins
• 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 for opto-couplers in isolated designs
OL
The transmitters (Tx) 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.
• 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
The receiver (Rx) inputs feature a full fail-safe design that
ensures a logic high Rx output if the Rx inputs are floating,
shorted, or on a terminated but undriven (idle) bus. The Rx
outputs have high drive levels; typically, 15mA at V = 1V (for
opto-coupled, isolated applications).
OL
Applications
• Utility meters/automated meter reading systems
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.
• High node count RS-485 systems
• PROFIBUS and RS-485 based field bus networks, and factory
automation
For fault protected or wide common-mode range RS-485
transceivers with cable invert (polarity reversal) pins, see the
ISL32483E datasheet.
• Security camera networks
• Building lighting and environmental control systems
• Industrial/process control networks
Related Literature
• For a full list of related documents, visit our website:
- ISL32490E, ISL32492E, ISL32493E, ISL32495E,
ISL32496E, and ISL32498E device pages
30
V
= ±1V
25
ID
B
A
25
20
15
10
5
12
0
-7
-12
RO
0
-20
-25
-5
STANDARD RS-485
TRANSCEIVER
CLOSEST
COMPETITOR
ISL3249xE
TIME (20ns/DIV)
FIGURE 1. EXCEPTIONAL Rx OPERATES AT >15Mbps EVEN WITH A
±25V COMMON-MODE VOLTAGE
FIGURE 2. ISL3249xE DELIVERS SUPERIOR COMMON-MODE
RANGE vs STANDARD RS-485 DEVICES
FN7786 Rev.6.00
Feb 8, 2019
Page 1 of 22
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