NOT RECOMMENDED FOR NEW DESIGNS
FOR EXACT REPLACEMENT SEE
ISL32490E Series Datasheet
DATASHEET
FN7637
Rev 3.00
May 13, 2015
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E,
ISL31496E, ISL31498E
The
ISL31490E, ISL31491E, ISL31492E, ISL31493E,
ISL31495E, ISL31496E, ISL31498E
are fault protected, 5V
powered, 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
protected against faults up to ±60V. Additionally, the extended
common mode range allows these transceivers to operate in
environments with common mode voltages up to ±25V (>2x the
RS-485 requirement), making this RS-485 family one of the
most robust on the market.
Transmitters 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.
Receiver (Rx) inputs feature a “Full Fail-safe” design, which
ensures a logic high Rx output if Rx inputs are floating, shorted,
or on a terminated but undriven (idle) bus. Rx outputs have high
drive levels - typically 15mA at V
OL
= 1V (for opto-coupled,
isolated applications).
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.
For fault protected or wide common mode range devices with
cable invert (polarity reversal) please see the
ISL32485E
datasheet.
Features
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±60V
• Extended common mode range. . . . . . . . . . . . . . . . . . . . ±25V
More than twice the range required for RS-485
• 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
OL
for opto-couplers in isolated designs
• 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
• Pb-free (RoHS compliant)
Applications
• Utility meters/automated meter reading systems
• High node count systems
• PROFIBUS™ and field bus networks, and factory automation
• Security camera networks
• Building lighting and environmental control systems
• Industrial/process control networks
30
B
25
20
VOLTAGE (V)
15
10
5
VID = ±1V
COMMON MODE RANGE
25
A
12
0
-7
-12
-20
-25
STANDARD RS-485
TRANSCEIVER
CLOSEST
COMPETITOR
ISL3149xE
RO
0
-5
TIME (20ns/DIV)
FIGURE 1. EXCEPTIONAL Rx OPERATES AT >15Mbps EVEN WITH A
±25V COMMON MODE VOLTAGE
FIGURE 2. ISL3149XE DELIVERS SUPERIOR COMMON MODE
RANGE vs STANDARD RS-485 DEVICES
FN7637 Rev 3.00
May 13, 2015
Page 1 of 26
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E, ISL31498E
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Truth Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical Operating Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Test Circuits and Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver (Rx) Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver (Tx) Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Overvoltage (Fault) Protection Increases Ruggedness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Widest Common Mode Voltage (CMV) Tolerance Improves Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High VOD Improves Noise Immunity and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hot Plug Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Rate, Cables and Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Built-in Driver Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Power Shutdown Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
14
14
14
14
14
15
15
15
15
Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Die Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M8.118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M10.118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
L8.3x3K. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
L10.3x3A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M14.15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E8.3 (JEDEC MS-001-BA ISSUE D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M8.15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
20
21
22
23
24
25
26
FN7637 Rev 3.00
May 13, 2015
Page 2 of 26
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E, ISL31498E
TABLE 1. SUMMARY OF FEATURES
PART NUMBER
ISL31490E
ISL31491E
ISL31492E
ISL31493E
ISL31495E
ISL31496E
ISL31498E
HALF/FULL
DUPLEX
Full
Full
Half
Full
Half
Full
Half
DATA RATE
(Mbps)
0.25
0.25
0.25
1
1
15
15
SLEW-RATE
LIMITED?
Yes
Yes
Yes
Yes
Yes
No
No
EN PINS?
Yes
No
Yes
Yes
Yes
Yes
Yes
HOT
PLUG?
Yes
Yes
Yes
Yes
Yes
Yes
Yes
QUIESCENT I
CC
(mA)
2.3
2.3
2.3
2.3
2.3
2.3
2.3
LOW POWER
SHDN?
Yes
No
Yes
Yes
Yes
Yes
Yes
PIN
COUNT
10, 14
8
8
10, 14
8
10, 14
8
Ordering Information
PART NUMBER
(Notes
3, 4)
ISL31490EIBZ (Note
1)
ISL31490EIUZ (Note
1)
ISL31490EIRTZ (Note
1)
ISL31491EIBZ (Note
1)
ISL31492EIBZ (Note
1)
ISL31492EIUZ (Note
1)
ISL31492EIPZ (Note
2)
ISL31492EIRTZ (Note
1)
ISL31493EIBZ (Note
1)
ISL31493EIUZ (Note
1)
ISL31495EIBZ (Note
1)
ISL31495EIUZ (Note
1)
ISL31496EIBZ (Note
1)
ISL31496EIUZ (Note
1)
ISL31498EIBZ (Note
1)
ISL31498EIUZ (Note
1)
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to
TB347
for details on reel specifications.
2. Pb-free PDIPs can be used for through-hole wave solder processing only. They are not intended for use in Reflow solder processing applications.
3. These Intersil 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). Intersil
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.
4. For Moisture Sensitivity Level (MSL), please see device information pages for
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E,
ISL31498E.
For more information on MSL please see techbrief
TB363.
PART
MARKING
ISL31490 EIBZ
1490E
490E
31491 EIBZ
31492 EIBZ
1492E
31492 EIPZ
492E
ISL31493 EIBZ
1493E
31495 EIBZ
1495E
ISL31496 EIBZ
1496E
31498 EIBZ
1498E
TEMP. RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE
(RoHS Compliant)
14 Ld SOIC
10 Ld MSOP
10 Ld TDFN
8 Ld SOIC
8 Ld SOIC
8 Ld MSOP
8 Ld PDIP
8 Ld TDFN
14 Ld SOIC
10 Ld MSOP
8 Ld SOIC
8 Ld MSOP
14 Ld SOIC
10 Ld MSOP
8 Ld SOIC
8 Ld MSOP
PKG.
DWG. #
M14.15
M10.118
L10.3x3A
M8.15
M8.15
M8.118
E8.3
L8.3x3K
M14.15
M10.118
M8.15
M8.118
M14.15
M10.118
M8.15
M8.118
FN7637 Rev 3.00
May 13, 2015
Page 3 of 26
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E, ISL31498E
Pin Configurations
ISL31492E, ISL31495E, ISL31498E
(8 LD MSOP, 8 LD SOIC,
8 LD PDIP, 8 LD TDFN)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
D
R
8
7
6
5
V
CC
B/Z
A/Y
GND
ISL31490E, ISL31493E, ISL31496E
(10 LD MSOP, 10 LD TDFN)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
GND 5
D
R
10 V
CC
9 A
8 B
7 Z
6 Y
ISL31490E, ISL31493E, ISL31496E
(14 LD SOIC)
TOP VIEW
NC 1
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
D
R
14 V
CC
13 V
CC
12 A
11 B
10 Z
9 Y
8 NC
ISL31491E
(8 LD SOIC)
TOP VIEW
V
CC
1
R
8 A
7 B
6 Z
D
5 Y
RO 2
DI 3
GND 4
NOTE: Evaluate creepage and clearance requirements at your maximum fault voltage before using small pitch packages (e.g., MSOP and TDFN).
Pin Descriptions
8 LD
8 LD
PIN #
PIN #
(ISL31491E
(EXCEPT
PIN
ONLY)
NAME ISL31491E)
RO
RE
DE
DI
GND
A/Y
B/Z
A
B
Y
Z
V
CC
PD
NC
1
2
3
4
5
6
7
-
-
-
-
8
-
-
2
-
-
3
4
-
-
8
7
5
6
1
-
-
10 LD
PIN #
1
2
3
4
5
-
-
9
8
6
7
10
TDFN ONLY
-
14 LD
PIN #
2
3
4
5
6, 7
-
-
12
11
9
10
-
1, 8
FUNCTION
Receiver output: If A-B
≥
-10mV, RO is high; If A-B
≤
-200mV, RO is low; RO = High if A and B are
unconnected (floating), shorted together, or connected to an undriven, terminated bus.
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.
Internally pulled low.
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high
impedance when DE is low. Internally pulled high.
Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces
output Y high and output Z low.
Ground connection. This is also the potential of the TDFN EPAD.
±60V Fault Protected RS-485/RS-422 level, non-inverting receiver input and non-inverting driver
output. Pin is an input if DE = 0; pin is an output if DE = 1.
±60V Fault Protected RS-485/RS-422 level, inverting receiver input and inverting driver output.
Pin is an input if DE = 0; pin is an output if DE = 1.
±60V Fault Protected RS-485/RS-422 level, non-inverting receiver input.
±60V Fault Protected RS-485/RS-422 level, inverting receiver input.
±60V Fault Protected RS-485/RS-422 level, non-inverting driver output.
±60V Fault Protected RS-485/RS-422 level, inverting driver output.
TDFN exposed thermal pad (EPAD). Connect to GND.
No Internal Connection.
13, 14 System power supply input (4.5V to 5.5V).
FN7637 Rev 3.00
May 13, 2015
Page 4 of 26
ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E, ISL31498E
Truth Tables
TRANSMITTING
INPUTS
RE
X
X
0
1
DE
1
1
0
0
DI
1
0
X
X
Z
0
1
High-Z
High-Z*
OUTPUTS
Y
1
0
High-Z
High-Z*
0
0
0
1
1
RE
DE
Half Duplex
0
0
0
0
1
RECEIVING
INPUTS
DE
Full Duplex
X
X
X
0
1
A-B
≥
-0.01V
≤
-0.2V
Inputs
Open/Shorted
X
X
OUTPUT
RO
1
0
1
High-Z*
High-Z
NOTE: *Low Power Shutdown Mode (see
Note 15
on
page 11),
except for
ISL31491E.
NOTE: *Low Power Shutdown Mode (see
Note 15
on
page 11),
except for
ISL31491E.
FN7637 Rev 3.00
May 13, 2015
Page 5 of 26
PCB Design
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