DATASHEET
ISL32172E, ISL32272E, ISL32174E, ISL32179E
FN6824
Rev 4.01
Mar 19, 2020
QUAD, ±16.5kV ESD Protected, 3.0V to 5.5V, Low Power, RS-422 Transmitters
The ISL32172E, ISL32272E, ISL32174E, and ISL32179E are
±16.5kV IEC61000-4-2 ESD protected, 3.0V to 5.5V powered,
QUAD transmitters for balanced communication using the RS422 standard. These drivers have very low output leakage
currents (±10µA), so they present a low load to the RS-422
bus.
The driver (Tx) outputs are tri-statable and incorporate a hot
plug feature to keep them disabled during power-up and
power-down. The ISL32172E and ISL32272E have a common
EN/EN, the ISL32174E has a two channel EN12/EN34, and the
ISL32179E has a versatile combination of individual and group
channel enables (see Table 1).
Only the ISL32179E driver can be slew-rate limited, and only at
the data rate of 0.46Mbps. Drivers on the other versions are not
limited, so they can achieve 10Mbps or 32Mbps data rates. All
versions are offered in industrial and extended industrial
(-40°C to +125°C) temperature ranges.
The ISL32179E’s QFN package has a 50% smaller footprint
compared to the TSSOP. The ISL32179E also features a logic
supply pin (VL) that sets the switching points of the enable and
DI inputs to be compatible with a lower supply voltage in mixed
voltage systems. Two speed select pins allow the ISL32179E to
be configured for 460kbps, 10Mbps, or 32Mbps data rates.
Individual channel and group enable pins increase the
ISL32179E’s flexibility.
Related Literature
Features
• IEC61000 ESD protection on RS-422 outputs . . . . ±16.5kV
- Class 3 ESD level on all other pins . . . . . . . . . . .12kV HBM
- High machine model ESD level on all pins . . . . . . . . . 700V
• Wide supply range . . . . . . . . . . . . . . . . . . . . . . . . . 3.0V to 5.5V
• Specified for +125°C operation
• Available in industry standard pinouts (ISL32172E,
ISL32272E, ISL32174E) or in a space saving QFN
(ISL32179E) with added features
• Logic supply pin (VL) eases operation in mixed supply
systems (ISL32179E only)
• User-selectable data rate (ISL32179E only)
• Hot plug Tx outputs remain tri-stated during power-up and
power-down
• Low Tx leakage allows > 256 devices on the bus
• High data rates. . . . . . . . . . . . . . . . . . . . . . . . . . up to 32Mbps
• Low quiescent supply current. . . . . . . . . . 0.8mA (maximum)
- Low shutdown supply current. . . . . . . . . . . . . . . . . . . . 60µA
• Current limiting and thermal shutdown for driver overload
protection
• Tri-statable Tx outputs
• 5V tolerant logic inputs when VCC ≤ 5V
• Pb-free (RoHS compliant)
For a full list of related documents, visit our website:
• ISL32172E, ISL32272E, ISL32174E, and ISL32179E device
pages
Applications
• Telecom equipment
• Motor controllers/encoders
• Programmable logic controllers
• Industrial/process control networks
TABLE 1. SUMMARY OF FEATURES
FUNCTION
DATA
RATE (Mbps)
SLEW
RATE
LIMITED?
HOT
PLUG?
VL
PIN?
TX
ENABLE
TYPE
QUIESCENT
ICC (mA)
LOW
POWER
SHUTDOWN?
PIN
COUNT
ISL32172E
4 Tx
32
NO
YES
NO
EN, EN
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