DATASHEET
ISL32172E, ISL32272E, ISL32174E, ISL32179E
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 RS-
422 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 (V
L
) 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.
FN6824
Rev 4.01
Mar 19, 2020
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 (V
L
) 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 V
CC
≤
5V
• Pb-free (RoHS compliant)
Related Literature
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
DATA
RATE (Mbps)
32
10
32
32, 10, 0.46
SLEW
RATE
LIMITED?
NO
NO
NO
SELECTABLE
HOT
PLUG?
YES
YES
YES
YES
V
L
PIN?
NO
NO
NO
YES
TX
ENABLE
TYPE
EN, EN
EN, EN
EN12, EN34
Individual
and group
enables
QUIESCENT
I
CC
(mA)
<1
<1
<1
<1
LOW
POWER
SHUTDOWN?
NO
NO
NO
YES
PIN
COUNT
16
16
16
24
PART NUMBER
ISL32172E
ISL32272E
ISL32174E
ISL32179E
FUNCTION
4 Tx
4 Tx
4 Tx
4 Tx
FN6824 Rev 4.01
Mar 19, 2020
Page 1 of 21
ISL32172E, ISL32272E, ISL32174E, ISL32179E
Typical Operating Circuits (1 of 4 Channels Shown)
3.3V to 5V
100nF
R
B
A 2
R
T
B 1
EN
4
R
B
V
FS
3 Z
GND
8
2 Y
100nF
3.3V to 5V
16
V
CC
3 RO
12 EN
GND
8
16
V
CC
EN 12
DI 1
EN 4
R
PU
R
PU
ISL32X73E
FIGURE 1. NETWORK USING GROUP ENABLES
ISL32X72E
3.3V to 5V
100nF
R
B
A1 2
R
T
B1 1
GND
8
R
B
V
FS
3 Z1
2 Y1
100nF
3.3V to 5V
R
PU
3 RO1
4 EN
16
V
CC
16
V
CC
EN12 4
DI1 1
GND
8
ISL32173E
FIGURE 2. NETWORK USING PAIRED ENABLES
ISL32174E
1.8V
3.3V to 5V
100nF
100nF
R
PU
9
R
B
R
PU
3.3V to 5V
2.5V
21
V
L
R
PU
V
CC
MCU/
UART
GND
1
2
RO1
EN 1
GND
10
22
V
CC
S H D N EN
21
V
CC
22
S H D N EN
2, 3, 15, 16
E N1 - E N4
14
EN
24 Y
20
V
L
V
CC
EN
4
D I 23
M C U/
UART
GND
GND
9
15
EN
4
EN
A 1 24
B 1 23
R
T
V
FS
1
Z
R
B
IS L32x77E
U sing ind ividual channel enable pins and
co nfigured for low est shutdow n sup ply current
N ote: W hen u sin g separate su pplies,
V
C C
m u st be pow ered up before V
L
IS L32179E
U sing active gro up en ab le pins an d con figu red
fo r lo w est shutdo w n sup ply cu rrent
N o te: W h en using separate sup plies,
V
C C
m ust b e p ow ered up before V
L
FIGURE 3. NETWORK WITH V
L
PIN FOR INTERFACING TO LOWER VOLTAGE LOGIC DEVICES
Note: To calculate the resistor values, see
TB509.
FN6824 Rev 4.01
Mar 19, 2020
Page 2 of 21
ISL32172E, ISL32272E, ISL32174E, ISL32179E
Ordering Information
PART NUMBER
(Notes
2, 3)
ISL32172EFBZ
ISL32172EFBZ-T
ISL32172EFVZ
ISL32172EFVZ-T
ISL32172EIBZ
ISL32172EIBZ-T
ISL32172EIVZ
ISL32172EIVZ-T
ISL32174EFVZ
ISL32174EFVZ-T
ISL32174EIBZ
ISL32174EIBZ-T
ISL32179EFRZ
ISL32179EFRZ-T
ISL32179EIRZ
ISL32179EIRZ-T
ISL32272EFBZ
ISL32272EFBZ-T
ISL32272EFVZ
ISL32272EFVZ-T
NOTES:
1. See
TB347
for details about reel specifications.
2. These Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate
plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Pb-free products are
MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), see the
ISL32172E, ISL32272E, ISL32174E,
and
ISL32179E
device pages. For more information about MSL, see
TB363.
PART
MARKING
ISL32172 EFBZ
ISL32172 EFBZ
32172 EFVZ
32172 EFVZ
ISL32172 EIBZ
ISL32172 EIBZ
32172 EIVZ
32172 EIVZ
32174 EFVZ
32174 EFVZ
ISL32174 EIBZ
ISL32174 EIBZ
321 79EFRZ
321 79EFRZ
321 79EIRZ
321 79EIRZ
ISL32272 EFBZ
ISL32272 EFBZ
32272 EFVZ
32272 EFVZ
TEMP. RANGE
(°C)
-40 to +125
-40 to +125
-40 to +125
-40 to +125
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +125
-40 to +125
-40 to +85
-40 to +85
-40 to +125
-40 to +125
-40 to +85
-40 to +85
-40 to +125
-40 to +125
-40 to +125
-40 to +125
TAPE AND REEL
(UNITS) (Note
1)
-
2.5k
-
2.5k
-
2.5k
-
2.5k
-
2.5k
-
2.5k
-
6k
-
6k
-
2.5k
-
2.5k
PACKAGE
(RoHS Compliant)
16 Ld SOIC
16 Ld SOIC
16 Ld TSSOP
16 Ld TSSOP
16 Ld SOIC
16 Ld SOIC
16 Ld TSSOP
16 Ld TSSOP
16 Ld TSSOP
16 Ld TSSOP
16 Ld SOIC
16 Ld SOIC
24 Ld QFN
24 Ld QFN
24 Ld QFN
24 Ld QFN
16 Ld SOIC
16 Ld SOIC
16 Ld TSSOP
16 Ld TSSOP
PKG.
DWG. #
M16.15
M16.15
MDP0044
MDP0044
M16.15
M16.15
MDP0044
MDP0044
MDP0044
MDP0044
M16.15
M16.15
L24.4x4C
L24.4x4C
L24.4x4C
L24.4x4C
M16.15
M16.15
MDP0044
MDP0044
FN6824 Rev 4.01
Mar 19, 2020
Page 3 of 21
ISL32172E, ISL32272E, ISL32174E, ISL32179E
Truth Tables
ISL32172E and ISL32272E
INPUTS
EN
X
1
0
EN
0
X
1
DIX
1/0
0/1
X
ZX
0/1
1/0
Z
OUTPUTS
YX
1/0
0/1
Z
0
X
1
1
1
ISL32174E
INPUTS
EN12
0
0
1
1
EN34
0
1
0
1
DIX
X
1/0
Z1
Z
Z
Y1
Z
Z
Z2
Z
Z
OUTPUTS
Y2
Z
Z
Z3
Z
Y3
Z
Z4
Z
Y4
Z
1
1
1
1
X
1
X
0
X
0/1
0
X
0
X
1
X
INPUTS
X
1
0
X
0
X
X
1/0
0/1
1/0
X
X
1
1
0
ISL32179E
OUTPUTS
COMMENTS
ENX EN EN DIX SPA SPB ZX YX
X
X
1
1
1
1
0
0
Z
Z
Z Ch X outputs disabled
Z All outputs disabled
0/ 1/ Individual ENX controls
1 0 Ch X (32Mbps)
1/ 0/
0 1
0/ 1/ Individual ENX controls
1 0 Ch X (10Mbps)
1/ 0/
0 1
0/ 1/ Individual ENX controls
1 0 Ch X (460kbps)
1/ 0/
0 1
NOTE: Z = Tri-state
1/0 X*
0/1 X*
0/1 1/0 0/1 1/0
Z
Z
Z
Z
1/0 0/1 1/0 0/1 1/0
1/0 0/1 1/0 0/1 1/0 0/1 1/0 0/1 1/0
NOTE: Z = Tri-state
NOTE: *Keep SPA = 1 for lowest current in SHDN. If using individual
channel enables and the SHDN mode, connect EN and EN to V
CC
for the
lowest SHDN current. The ISL32179E enters SHDN when SHDNEN = 1
and all channels are disabled. Z = Tri-state.
Pin Configurations
ISL32172E, ISL32272E
(16 LD N-SOIC, TSSOP)
TOP VIEWS
DI1 1
Y1 2
Z1 3
EN
4
Z2 5
Y2 6
DI2 7
GND 8
D
D
D
D
16 V
CC
15 DI4
14 Y4
13 Z4
12
EN
11 Z3
10 Y3
9 DI3
ISL32174E
(16 LD N-SOIC, TSSOP)
TOP VIEWS
DI1 1
Y1 2
Z1 3
EN12
4
Z2 5
Y2 6
DI2 7
GND 8
D
D
D
D
16 V
CC
15 DI4
14 Y4
13 Z4
12
EN34
11 Z3
10 Y3
9 DI3
FN6824 Rev 4.01
Mar 19, 2020
Page 4 of 21
ISL32172E, ISL32272E, ISL32174E, ISL32179E
Pin Configurations
(Continued)
ISL32179E
(24 LD QFN)
TOP VIEW
SHDNEN
V
CC
DI1
24
Z1 1
EN1 2
EN2 3
EN
4
23
22
21
20
DI4
Y1
V
L
19
18 Y4
17 Z4
16 EN4
15 EN3
14 EN
13 Z3
Z2 5
Y2
6
7
DI2
8
SPA
9
GND
10
SPB
11
DI3
12
Y3
Pin Descriptions
PIN
EN, EN
FUNCTION
Group driver output enables that are internally pulled high to V
CC
.
All ISL32x72E driver outputs, Y and Z, are enabled by driving EN high OR EN low. The outputs are high impedance when EN is low AND EN
is high (for example, if using only the active high EN, connect EN directly to V
CC
or V
L
; if using only the active low EN, connect EN directly
to GND).
To use group enable on the ISL32179E, connect all the ENX pins to V
CC
or V
L
and use the EN or EN pin as previously described. If the group
driver enable function is not required (see
Note 4),
connect EN to V
CC
, or connect EN to GND (ISL32x72E and ISL32179E only).
EN12, EN34 Paired driver output enables that are internally pulled high to V
CC
. Driving EN12 (EN34) high enables the Channel 1 and 2 (3 and 4) outputs
(Y and Z). Driving EN12 (EN34) low disables Channel 1 and 2 (3 and 4) outputs. If the driver enable function is not required (see
Note 4),
connect EN12 and EN34 to V
CC
(ISL32174E only).
ENx
Individual driver output enables that are internally pulled high to V
CC
. Forcing ENx high with EN high OR EN low enables the channel X
outputs (Y and Z). Driving ENX low disables the Channel X outputs regardless of the states of EN and EN. Connect both EN and EN to V
CC
for the lowest SHDN current if using SHDN mode (see SHDNEN below). If the individual driver enable function is not required (see
Note 4),
connect ENX to V
CC
(ISL32179E only).
Low power SHDN mode enable. A high level allows the ISL32179E to enter a low power mode when all channels are disabled. A low level
prevents the device from entering the low power mode (ISL32179E only).
Driver input. A low on DI forces the corresponding channel’s output Y low and output Z high. A high on DI forces output Y high and output
Z low.
Speed select inputs that are internally pulled high. See the ISL32179E truth table on
page 4
(ISL32179E only).
Ground connection. This is also the potential of the QFN thermal pad.
±16.5kV IEC61000-4-2 ESD protected RS-422 level and a noninverting transmitter output.
±16.5kV IEC61000-4-2 ESD protected RS-422 level and an inverting transmitter output.
System power supply input (3.0V to 5.5V). Power up V
CC
first on devices with a V
L
pin powered from a separate supply.
Logic power supply input. Connecting the V
L
pin to the lower voltage power supply of a logic device (such as a UART or microcontroller)
interfacing with the ISL32179E configures its logic pin (DI, EN (all varieties), SHDNEN, and SP) V
IL
/V
IH
levels to values compatible with the
lower supply voltage. If V
L
and V
CC
are different supplies, power up this supply after V
CC
and keep V
L
≤
V
CC
. (ISL32179E only)
Thermal pad. Connect EP to GND (ISL32179E only).
SHDNEN
DIx
SPA, SPB
GND
Yx
Zx
V
CC
V
L
EP
NOTE:
4. Tie unused EN pins with a 1k resistor to V
CC
.
FN6824 Rev 4.01
Mar 19, 2020
Page 5 of 21
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