DATASHEET
ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491
5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
The Intersil RS-485/RS-422 devices are BiCMOS 5V
powered, single transceivers that meet both the RS-485 and
RS-422 standards for balanced communication. Unlike
competitive devices, this Intersil family is specified for 10%
tolerance supplies (4.5V to 5.5V).
The ISL8483, ISL8488, and ISL8489 utilize slew rate limited
drivers which reduce EMI, and minimize reflections from
improperly terminated transmission lines, or unterminated
stubs in multidrop and multipoint applications.
Data rates up to 5Mbps are achievable by using the
ISL8485, ISL8490, or ISL8491, which feature higher slew
rates.
All devices present a “single unit load” to the RS-485 bus,
which allows up to 32 transceivers on the network.
Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are
floating.
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
The ISL8488 - 91 are configured for full duplex (separate Rx
input and Tx output pins) applications. The ISL8488 and
ISL8490 are offered in space saving 8 lead packages for
applications not requiring Rx and Tx output disable functions
(e.g., point-to-point). Half duplex configurations (ISL8483,
ISL8485) multiplex the Rx inputs and Tx outputs to allow
transceivers with Rx and Tx disable functions in 8 lead
packages.
FN6046
Rev 9.00
February 16, 2016
Features
• Specified for 10% Tolerance Supplies
• Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV
• High Data Rates. . . . . . . . . . . . . . . . . . . . . . up to 5Mbps
• Slew Rate Limited Versions for Error Free Data
Transmission at 250kbps (ISL8483, ISL8488, ISL8489)
• Single Unit Load Allows up to 32 Devices on the Bus
• 1nA Low Current Shutdown Mode (ISL8483)
• Low Quiescent Current:
- 160
A (ISL8483, ISL8488, ISL8489)
- 500
A (ISL8485, ISL8490, ISL8491)
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs (Except ISL8488,
ISL8490)
• 30ns Propagation Delays, 5ns Skew (ISL8485, ISL8490,
ISL8491)
• Full Duplex and Half Duplex Pinouts
• Operate from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
•
Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Factory Automation
• Security Networks
• Building Environmental Control Systems
• Industrial/Process Control Networks
• Level Translators (e.g., RS-232 to RS-422)
• RS-232 “Extension Cords”
FN6046 Rev 9.00
February 16, 2016
Page 1 of 18
ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL8483
(No longer
available or
supported)
ISL8485
ISL8488
(No
longer
available or
supported)
ISL8489
(No
longer
available or
supported
ISL8490
ISL8491
HALF/FULL NO. OF DEVICES
DUPLEX
ALLOWED ON BUS
Half
32
DATA
RATE
(Mbps)
0.25
SLEW-RATE
LIMITED?
Yes
RECEIVER/
DRIVER
ENABLE?
Yes
QUIESCENT
I
CC
(A)
160
LOW POWER
SHUTDOWN?
Yes
PIN
COUNT
8
Half
Full
32
32
5
0.25
No
Yes
Yes
No
500
160
No
No
8
8
Full
32
0.25
Yes
Yes
160
No
14
Full
Full
32
32
5
5
No
No
No
Yes
500
500
No
No
8
14
Ordering Information
PART NUMBER
ISL8483IPZ (Note)
(No longer
available, recommended
replacement ISL3152EIPZ)
ISL8485CBZ (Note)
ISL8485CBZ-T (Note)
ISL8485CPZ (Note)
ISL8485IBZ (Note)
ISL8485IB-T
ISL8485IBZ-T (Note)
ISL8485IP
ISL8485IPZ (Note)
ISL8488IBZ (Note)
(No longer
available, recommended
replacement ISL8488EIBZ)
ISL8488IPZ (Note)
(No longer
available, recommended
replacement ISL3152EIPZ)
ISL8489IP
(No longer available, no
recommended replacement )
ISL8490IBZ (Note)
ISL8490IBZ-T (Note)
ISL8491IBZ (Note)
ISL8491IBZ-T (Note)
PART MARKING
ISL8483IPZ
TEMP. RANGE (°C)
-40 to 85
PACKAGE
8 Ld PDIP* (Pb-free)
PKG. DWG. #
E8.3
8485CBZ
8485CBZ
ISL8485CPZ
8485IBZ
8485IB
8485IBZ
ISL8485IP
ISL8485IPZ
8488IBZ
0 to 70
0 to 70
-40 to 85
8 Ld SOIC Tape and Reel
8 Ld SOIC(Pb-free)
8 Ld PDIP* (Pb-free)
8 Ld SOIC (Pb-free)
M8.15
M8.15
E8.3
M8.15
M8.15
M8.15
E8.3
E8.3
M8.15
8 Ld SOIC Tape and Reel (Pb-free)
8 Ld SOIC Tape and Reel (Pb-free)
-40 to 85
-40 to 85
-40 to 85
8 Ld PDIP
8 Ld PDIP* (Pb-free)
8 Ld SOIC (Pb-free)
ISL8488IPZ
-40 to 85
8 Ld PDIP* (Pb-free)
E8.3
ISL8489IP
-40 to 85
14 Ld PDIP
E14.3
8490IBZ
8490IBZ
8491IBZ
8491IBZ
-40 to 85
-40 to 85
8 Ld SOIC (Pb-free)
14 Ld SOIC (Pb-free)
M8.15
M8.15
M14.15
M14.15
8 Ld SOIC Tape and Reel (Pb-free)
14 Ld SOIC Tape and Reel (Pb-free)
*Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are 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.
FN6046 Rev 9.00
February 16, 2016
Page 2 of 18
ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491
Pinouts
ISL8483, ISL8485 (PDIP, SOIC)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
D
8
7
6
5
V
CC
B/Z
A/Y
GND
ISL8488, ISL8490 (PDIP, SOIC)
TOP VIEW
V
CC
1
RO 2
DI 3
GND 4
D
8
7
6
5
A
B
Z
Y
ISL8489, ISL8491 (PDIP, SOIC)
TOP VIEW
NC 1
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
D
R
14 V
CC
13 NC
12 A
11 B
10 Z
9 Y
8 NC
R
R
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 *
RE
0
0
0
1
1
RECEIVING
INPUTS
DE
DE
Half Duplex Full Duplex
0
0
0
0
1
X
X
X
0
1
A-B
+0.2V
-0.2V
Inputs Open
X
X
OUTPUT
RO
1
0
1
High-Z *
High-Z
*Shutdown Mode for ISL8483 (see Note 7)
*Shutdown Mode for ISL8483 (see Note 7)
Pin Descriptions
PIN
RO
RE
DE
DI
GND
A/Y
B/Z
A
B
Y
Z
V
CC
NC
FUNCTION
Receiver output: If A > B by at least 0.2V, RO is high; If A < B by 0.2V or more, RO is low; RO = High if A and B are unconnected (floating).
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low.
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.
Noninverting receiver input and noninverting driver output. Pin is an input (A) if DE = 0; pin is an output (Y) if DE = 1.
Inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is an output (Z) if DE = 1.
Noninverting receiver input.
Inverting receiver input.
Noninverting driver output.
Inverting driver output.
System power supply input (4.5V to 5.5V).
No Connection.
FN6046 Rev 9.00
February 16, 2016
Page 3 of 18
ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491
Typical Operating Circuits
ISL8483, ISL8485
+5V
+
8
V
CC
1
2
3
4
RO
RE
DE
DI
R
B/Z
A/Y
7
6
R
T
R
T
7
6
B/Z
A/Y
+
8
V
CC
D
DI
DE
RE
RO
4
3
2
1
+5V
0.1F
0.1F
D
GND
5
GND
5
R
ISL8488, ISL8490
+5V
+
1
V
CC
A
2
RO
R
B
8
7
R
T
5
6
Y
Z
D
DI
3
+
1
V
CC
+5V
0.1F
0.1F
Z
3
DI
D
GND
4
Y
6
5
R
T
7
8
B
A
GND
4
R
RO
2
ISL8489, ISL8491
+5V
+
14
V
CC
2
3
4
5
RO
RE
DE
Z
DI
D
GND
6, 7
Y
10
9
R
T
11
12
B
A
GND
6, 7
R
R
A
B
12
11
+
14
9
10
Y
Z
V
CC
D
DI
DE
RE
RO
5
4
3
2
+5V
0.1F
R
T
0.1F
FN6046 Rev 9.00
February 16, 2016
Page 4 of 18
ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491
Absolute Maximum Ratings
V
CC
to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V
CC
+0.5V)
Input/Output Voltages
A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V
CC
+0.5V)
Short Circuit Duration
Y, Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating
HBM (Per MIL-STD-883, Method 3015.7) . . . . . . . . . . . . . . >7kV
Thermal Information
Thermal Resistance (Typical, Note 1)
JA
(°C/W)
Operating Conditions
Temperature Range
ISL84XXCX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
ISL84XXIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 85°C
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . .
170
8 Ld PDIP Package* . . . . . . . . . . . . . . . . . . . . . . . .
140
14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
120
14 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . .
100
Moisture Sensitivity (see Technical Brief TB363)
All Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1
Maximum Junction Temperature (Plastic Package) . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300°C
(SOIC - Lead Tips Only)
*Pb-free PDIPs can be used for through hole wave solder processing
only. They are not intended for use in Reflow solder processing
applications.
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1.
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: V
CC
= 4.5V to 5.5V; Unless Otherwise Specified.
Typicals are at V
CC
= 5V, T
A
= 25°C, Note 2
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
MAX
UNITS
PARAMETER
DC CHARACTERISTICS
Driver Differential V
OUT
(no load)
Driver Differential V
OUT
(with load)
V
OD1
V
OD2
R = 50 (RS-422), Figure 1
R = 27 (RS-485), Figure 1
Full
Full
Full
Full
-
2
1.5
-
-
3
2.3
0.01
V
CC
-
5
0.2
V
V
V
V
Change in Magnitude of Driver
Differential V
OUT
for
Complementary Output States
Driver Common-Mode V
OUT
Change in Magnitude of Driver
Common-Mode V
OUT
for
Complementary Output States
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
V
OD
R = 27 or 50, Figure 1
V
OC
V
OC
R = 27 or 50, Figure 1
R = 27 or 50, Figure 1
Full
Full
-
-
-
0.01
3
0.2
V
V
V
IH
V
IL
I
IN1
I
IN1
I
IN1
DE, DI, RE
DE, DI, RE
DE, DI, RE (ISL8483)
DI (ISL8485 -
ISL8491)
DE,
RE (ISL8485, ISL8489, ISL8491)
DE = 0V, V
CC
= 0V or
4.5 to 5.5V
-7V
V
CM
12V
V
CM
= 0V
I
O
= -4mA, V
ID
= 200mV
I
O
= -4mA, V
ID
= 200mV
0.4V
V
O
2.4V
V
IN
= 12V
V
IN
= -7V
Full
Full
Full
Full
Full
Full
Full
Full
25
Full
Full
Full
2
-
-2
-2
-25
-
-
-0.2
-
3.5
-
-
-
-
-
-
-
-
-
-
70
-
-
-
-
0.8
2
2
25
1
-0.8
0.2
-
-
0.4
1
V
V
A
A
A
mA
mA
V
mV
V
V
A
Input Current (A, B), Note 10
I
IN2
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State (high impedance)
Receiver Output Current
V
TH
V
TH
V
OH
V
OL
I
OZR
FN6046 Rev 9.00
February 16, 2016
Page 5 of 18
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