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ISL8483, ISL8485, ISL8488,
ISL8489, ISL8490, ISL8491
Data Sheet
February 28, 2006
FN6046.8
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.
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
µ
A (ISL8483, ISL8488, ISL8489)
- 500
µ
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”
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL8483
ISL8485
ISL8488
ISL8489
ISL8490
ISL8491
HALF/FULL
DUPLEX
Half
Half
Full
Full
Full
Full
NO. OF DEVICES DATA RATE
ALLOWED ON BUS
(Mbps)
32
32
32
32
32
32
0.25
5
0.25
0.25
5
5
SLEW-RATE
RECEIVER/
QUIESCENT
LIMITED?
DRIVER ENABLE?
I
CC
(µA)
Yes
No
Yes
Yes
No
No
Yes
Yes
No
Yes
No
Yes
160
500
160
160
500
500
LOW POWER
SHUTDOWN?
Yes
No
No
No
No
No
PIN
COUNT
8
8
8
14
8
14
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003, 2005, 2006. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491
Ordering Information
PART NUMBER
ISL8483CPZ (Note)
ISL8483IB
ISL8483IBZ (Note)
ISL8483IB-T
ISL8483IBZ-T (Note)
ISL8483IP
ISL8483IPZ (Note)
ISL8485CB
ISL8485CBZ (Note)
ISL8485CB-T
ISL8485CBZ-T (Note)
ISL8485CP
ISL8485CPZ (Note)
ISL8485IB
ISL8485IBZ (Note)
ISL8485IB-T
ISL8485IBZ-T (Note)
ISL8485IP
ISL8485IPZ (Note)
ISL8488IB
ISL8488IBZ (Note)
ISL8488IB-T
ISL8488IBZ-T (Note)
ISL8488IP
ISL8488IPZ (Note)
ISL8489IB
ISL8489IB-T
ISL8489IP
ISL8490IB
ISL8490IBZ (Note)
ISL8490IB-T
ISL8490IBZ-T (Note)
ISL8490IP
ISL8491IB
ISL8491IBZ (Note)
ISL8491IB-T
ISL8491IBZ-T (Note)
ISL8491IP
PART MARKING
ISL8483CPZ
8483IB
8483IBZ
8483IB
8483IBZ
ISL8483IP
ISL8483IPZ
8485CB
8485CBZ
8485CB
8485CBZ
ISL8485CP
ISL8485CPZ
8485IB
8485IBZ
8485IB
8485IBZ
ISL8485IP
ISL8485IPZ
8488IB
8488IBZ
8488IB
8488IBZ
ISL8488IP
ISL8488IPZ
ISL8489IB
ISL8489IB
ISL8489IP
8490IB
8490IBZ
8490IB
8490IBZ
ISL8490IP
ISL8491IB
8491IBZ
ISL8491IB
8491IBZ
ISL8491IP
TEMP. RANGE (°C)
-40 to 85
-40 to 85
-40 to 85
8 Ld SOIC Tape and Reel
8 Ld SOIC Tape and Reel (Pb-free)
-40 to 85
-40 to 85
0 to 70
0 to 70
8 Ld SOIC Tape and Reel
8 Ld SOIC Tape and Reel (Pb-free)
0 to 70
0 to 70
-40 to 85
-40 to 85
8 Ld SOIC Tape and Reel
8 Ld SOIC Tape and Reel (Pb-free)
-40 to 85
-40 to 85
-40 to 85
-40 to 85
8 Ld SOIC Tape and Reel
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)
14 Ld SOIC
8 Ld PDIP
8 Ld PDIP* (Pb-free)
8 Ld SOIC
8 Ld SOIC (Pb-free)
8 Ld PDIP
8 Ld PDIP* (Pb-free)
8 Ld SOIC
8 Ld SOIC (Pb-free)
8 Ld PDIP
8 Ld PDIP* (Pb-free)
8 Ld SOIC
8 Ld SOIC(Pb-free)
PACKAGE
8 Ld PDIP* (Pb-free)
8 Ld SOIC
8 Ld SOIC (Pb-free)
PKG. DWG. #
E8.3
M8.15
M8.15
M8.15
M8.15
E8.3
E8.3
M8.15
M8.15
M8.15
M8.15
E8.3
E8.3
M8.15
M8.15
M8.15
M8.15
E8.3
E8.3
M8.15
M8.15
M8.15
M8.15
E8.3
E8.3
M14.15
M14.15
E14.3
M8.15
M8.15
M8.15
M8.15
E8.3
M14.15
M14.15
M14.15
M14.15
E14.3
14 Ld SOIC Tape and Reel
-40 to 85
-40 to 85
-40 to 85
8 Ld SOIC Tape and Reel
8 Ld SOIC Tape and Reel (Pb-free)
-40 to 85
-40 to 85
-40 to 85
8 Ld PDIP
14 Ld SOIC
14 Ld SOIC (Pb-free)
14 Ld PDIP
8 Ld SOIC
8 Ld SOIC (Pb-free)
14 Ld SOIC Tape and Reel
14 Ld SOIC Tape and Reel (Pb-free)
-40 to 85
14 Ld PDIP
*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.
2
FN6046.8
February 28, 2006
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
R
RE 3
DE 4
DI 5
GND 6
GND 7
D
12 A
11 B
10 Z
9 Y
8 NC
14 V
CC
13 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
0
0
High-Z
0
High-Z *
1
*Shutdown Mode for ISL8483 (see Note 7)
1
1
1
X
High-Z
*Shutdown Mode for ISL8483 (see Note 7)
0
0
X
High-Z *
0
X
Inputs Open
1
0
X
0
X
RE
RECEIVING
INPUTS
DE
DE
Half Duplex Full Duplex
A-B
≥
+0.2V
≤
-0.2V
OUTPUT
RO
1
0
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.
3
FN6046.8
February 28, 2006
ISL8483, ISL8485, ISL8488, ISL8489, ISL8490, ISL8491
Typical Operating Circuits
ISL8483, ISL8485
+5V
+
0.1µF
8
V
CC
1
2
3
4
RO
RE
DE
DI
D
GND
5
GND
5
R
R
B/Z
A/Y
7
6
R
T
R
T
7
6
B/Z
A/Y
0.1µF
8
V
CC
D
DI
DE
RE
RO
4
3
2
1
+
+5V
ISL8488, ISL8490
+5V
+
0.1µF
1
V
CC
A
2
RO
R
B
8
7
R
T
5
6
Y
Z
D
DI
3
0.1µF
1
V
CC
+
+5V
Z
3
DI
D
GND
4
Y
6
5
R
T
7
8
B
A
GND
4
R
RO
2
ISL8489, ISL8491
+5V
+
0.1µF
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
RO
2
R
A
B
12
11
R
T
0.1µF
14
9
10
Y
Z
V
CC
DI
D
DE
RE
4
3
5
+
+5V
4
FN6046.8
February 28, 2006
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