DATASHEET
ISL32704E
FN8860
Rev.4.00
Feb 12, 2018
Ultra-Low EMI, Smallest Package Isolated RS-485 Transceiver
The ISL32704E is a galvanically isolated, differential bus
Features
transceiver designed for bidirectional data transmission and
meeting the RS-485 and RS-422 standards for balanced
communication. Each of the bus terminals, A and B, is
protected against ±15kV ESD strikes without latch-up.
• 4Mbps data rate
• 2.5kV
isolation per UL 1577
RMS
• 600V
working voltage per VDE 0884
RMS
The device uses Giant Magnetoresistance (GMR) as isolation
technology. A unique ceramic/polymer composite barrier
provides excellent isolation and virtually unlimited barrier life.
• 3V to 5V power supplies
• Single unit load receiver input
• Driver drives up to 150 unit loads
The part is available in a 16 Ld QSOP package offering
unprecedented miniaturization, and in a 16 Ld wide-body SOIC
package providing true 8 millimeter creepage distance.
• 50kV/µs (typical), 30kV/µs (minimum) common-mode
transient immunity
• 44000 years barrier life
The ISL32704E delivers a minimum differential output voltage
of 1.5V into a 54Ω differential load for excellent data integrity
over long cable lengths.
• 15kV ESD bus-pin protection
• Thermal shutdown protection
• -40°C to +85°C temperature range
• Meets or exceeds ANSI RS-485
• 16 Ld QSOP and 0.3” true 8mm 16 Ld SOIC packages
• UL 1577 recognized
The device is compatible with 3V and 5V input supplies,
allowing interface to standard microcontrollers without
additional level shifting.
Current limiting and thermal shutdown features protect
against output short circuits and bus contention that may
cause excessive power dissipation. Receiver inputs feature a
“fail-safe if open” design, ensuring a logic high R-output if A/B
are floating.
• VDE V0884-10 certified
Applications
• Factory automation
Related Literature
For a full list of related documents, visit our website
• ISL32704E product page
• Security networks
• Building environmental control systems
• Industrial/process control networks
• Level translators (i.e., RS-232 to RS-485)
Isolation
Barrier
Isolation
3.3V
5V
5V
3.3V
Barrier
100n
100n
100n
100n
1
16
16
1
VDD1
VDD2
VDD2
VDD1
11
15
12
9
11
15
12
9
VDD2X
ISODE
XDE
A
VDD2X
ISODE
XDE
A
2
4
5
6
2
4
5
6
542R
135R
542R
R
R
RE
DE
D
RE
DE
D
120R
10
13
10
13
B
B
ISOR
GND2
14
ISOR
GND2
14
GND1
GND1
3
3
ISL32704EIAZ
ISL32704EIAZ
Isolation
Barrier
Isolation
3.3V
5V
5V
3.3V
Barrier
100n
100n
100n
100n
1
16
VDD2
16
VDD2
1
542R
135R
VDD1
VDD1
3
4
5
6
3
4
5
6
R
R
12
13
10
12
13
10
A
A
120R
RE
DE
D
RE
DE
D
B
B
ISODE
ISODE
542R
GND1
2,8
GND2
GND2
GND1
2,8
9,15
9,15
ISL32704EIBZ
ISL32704EIBZ
FIGURE 1. TYPICAL ISOLATED HIGH-SPEED RS-485 APPLICATIONS
FN8860 Rev.4.00
Feb 12, 2018
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