Document
DATASHEET
ISL32172E, ISL32272E, ISL32174E, ISL32179E
QUAD, ±16.5kV ESD Protected, 3.0V to 5.5V, Low Power, RS-422 Transmitters
FN6824 Rev 4.01 Mar 19, 2020
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
For a full list of related documents, visit our website:
• ISL32172E, ISL32272E, ISL32174E, and ISL32179E device pages
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)
Applications
• Telecom equipment
• Motor controllers/encoders
• Programmable logic controllers
• Industrial/process control networks
PART NUMBER ISL32172E ISL32272E ISL32174E ISL32179E
TABLE 1. SUMMARY OF FEATURES
DATA FUNCTION RATE (Mbps)
4 Tx 32
SLEW RATE LIMITED?
NO
HOT PLUG?
YES
VL PIN? NO
TX ENABLE
TYPE
EN, EN
QUIESCENT ICC (mA)
<1
4 Tx 10
NO
YES NO
EN, EN
<1
4 Tx 32
NO
YES NO EN12, EN34
<1
4 Tx 32, 10, 0.46 SELECTABLE YES YES Individual and group enables
<1
LOW POWER SHUTDOWN?
NO
NO
NO
YES
PIN COUNT
16
16
16
24
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
3.3V to 5V
RPU
16 VCC
100nF
3 RO
A2
12 EN
B1
GND 8
EN 4
RB RT RB
100nF
16 VCC
EN 12
RPU
VFS
2Y
DI 1
3 Z EN 4
GND 8
ISL32X73E
FIGURE 1. NETWORK USING GROUP ENABLES
ISL32X72E
3.3V to 5V
RPU
16 VCC
3 RO1 4 EN
GND 8
100nF
A1 2 B1 1
RB RT RB
3.3V to 5V
100nF
16
VCC EN12 4
VFS
2 Y1
DI1 1
3 Z1
GND 8
ISL32173E
FIGURE 2. NETWORK USING PAIRED ENABLES
ISL32174E
VCC
MCU/ UART
GND
RPU
1.8V 3.3V to 5V
21 VL
1 RO1 2 EN1
22 VCC SHDNEN
EN EN A1
9
15 4
24
B1 23
GND 10
RPU
100nF RB RT RB
VFS
RPU
3.3V to 5V 2.5V 100nF
22 2, 3, 15, 16
14
24
21 VCC
SHDNEN EN1 - EN4 EN
Y
20 VL
EN DI
4 23
1Z
GND 9
VCC
MCU/ UART
GND
ISL32x77E
IS L 3 2 1 7 9 E
Using individual channel enable pins and configured for lowest shutdown supply current
Using active group enable pins and configured for lowest shutdown supply current
Note: W hen using separate supplies, VCC must be powered up before VL
Note: W hen using separate supplies, VCC m ust be powered up before VL
FIGURE 3. NETWORK WITH VL 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)
PART MARKING
TEMP. RANGE (°C)
TAPE AND REEL (UNITS) (Note 1)
PACKAGE (RoHS Compliant)
PKG. DWG. #
ISL32172EFBZ
ISL32172 EFBZ
-40 to +125
- 16 Ld SOIC
M16.15
ISL32172EFBZ-T
ISL32172 EFBZ
-40 to +125
2.5k 16 Ld SOIC
M16.15
ISL32172EFVZ
32172 .