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ISL4489E, ISL4491E
Data Sheet
April 28, 2006
FN6074.3
±
15kV ESD Protected, 1/8 Unit Load, 5V,
Low Power, High Speed and Slew Rate
Limited, Full Duplex, RS-485/RS-422
Transceivers
The ISL4489E, ISL4491E are ESD protected, “fractional”
unit load, BiCMOS, 5V powered, single transceivers that
meet both the RS-485 and RS-422 standards for balanced
communication. Each driver output and receiver input is
protected against ±15kV ESD strikes, without latch-up.
Unlike competitive versions, these Intersil devices are
specified for 10% tolerance supplies (4.5V to 5.5V).
Rx inputs and Tx outputs present a “1/8 unit load” to the
RS-485 bus, which allows a total of 256 transmitters and
receivers on the network for large node count systems.
These devices are configured for full duplex (separate Rx
input and Tx output pins) applications, so they are ideal for
RS-422 networks requiring high ESD tolerance on the bus
pins.
The ISL4489E utilizes a slew rate limited driver which
reduces EMI, and minimizes reflections from improperly
terminated transmission lines, or unterminated stubs in
multidrop and multipoint applications.
Data rates up to 15Mbps are achievable by using the
ISL4491E, which features higher slew rates.
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.
Features
• Pb-free Available as an Option (RoHS Compliant)
(See Ordering Info)
• RS-485 I/O Pin ESD Protection
. . . . . . . . . . . . . ±
15kV HBM
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• 1/8 Unit Load Allows up to 256 Devices on the Bus
• High Data Rates (ISL4491E) . . . . . . . . . . . up to 15Mbps
• Slew Rate Limited Version for Error Free Data
Transmission (ISL4489E)
• Very Low Quiescent Current:
- 140
μ
A (ISL4489E)
- 370
μ
A (ISL4491E)
• -7V to +12V Common Mode Input Voltage Range
• Three-State Rx and Tx Outputs
• Full Duplex Pinout
• Operates from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
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
ISL4489E
ISL4491E
HALF/FULL
DUPLEX
Full
Full
HIGH ESD?
Yes
Yes
NO. OF DEVICES
ALLOWED ON BUS
256
256
DATA RATE
(Mbps)
0.25
15
SLEW-RATE
RECEIVER/
QUIESCENT
PIN
LIMITED?
DRIVER ENABLE?
I
CC
(μA)
COUNT
Yes
No
Yes
Yes
140
370
14
14
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004, 2006. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL4489E, ISL4491E
Ordering Information
PART
NUMBER
ISL4489EIB
ISL4489EIBZ
(Note)
ISL4491EIB
ISL4491EIBZ
(Note)
PART
TEMP.
MARKING RANGE (°C)
ISL4489EIB
4489EIBZ
ISL4491EIB
4491EIBZ
-40 to 85
-40 to 85
-40 to 85
-40 to 85
PACKAGE
14 Ld SOIC
14 Ld SOIC
(Pb-free)
14 Ld SOIC
14 Ld SOIC
(Pb-free)
PKG.
DWG. #
M14.15
NC 1
Pinout
ISL4489E, ISL4491E (SOIC)
TOP VIEW
M14.15
RO 2
R
14 V
CC
13 NC
12 A
11 B
D
10 Z
9 Y
8 NC
M14.15
M14.15
RE 3
DE 4
DI 5
GND 6
GND 7
Add “-T” suffix for tape and reel.
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.
Truth Tables
TRANSMITTING
INPUTS
RE
X
X
X
DE
1
1
0
DI
1
0
X
Z
0
1
High-Z
OUTPUTS
Y
1
0
High-Z
RE
0
0
0
1
RECEIVING
INPUTS
DE
X
X
X
X
A-B
≥
+0.2V
≤
-0.2V
Inputs Open
X
OUTPUT
RO
1
0
1
High-Z
Pin Descriptions
PIN
RO
RE
DE
DI
GND
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.
±15kV
HBM ESD Protected, Noninverting receiver input.
±15kV
HBM ESD Protected, Inverting receiver input.
±15kV
HBM ESD Protected, Noninverting driver output.
±15kV
HBM ESD Protected, Inverting driver output.
System power supply input (4.5V to 5.5V).
No Connection.
2
FN6074.3
ISL4489E, ISL4491E
Typical Operating Circuit
ISL4489E, ISL4491E
+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
3
FN6074.3
ISL4489E, ISL4491E
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 . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical, Note 1)
θ
JA
(°C/W)
14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
128
Maximum Junction Temperature (Plastic Package) . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300°C
(Lead Tips Only)
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to 85°C
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.
θ
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
ΔV
OD
R = 50Ω (RS-422) (Figure 1)
R = 27Ω (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
R = 27Ω or 50Ω (Figure 1)
V
OC
ΔV
OC
R = 27Ω or 50Ω (Figure 1)
R = 27Ω or 50Ω (Figure 1)
Full
Full
-
-
-
0.01
3
0.2
V
V
V
IH
V
IL
I
IN1
DE, DI, RE
DE, DI, RE
DI
DE, RE
Full
Full
Full
Full
V
IN
= 12V
V
IN
= -7V
Full
Full
Full
Full
25
Full
Full
Full
Full
Full
Full
Full
Full
2
0.8
-2
-40
-
-100
-100
-0.2
-
3.5
-
-
92
-
-
35
7
-
-
-
-
-
-
-
-
70
-
-
-
120
140
370
-
-
-
-
2
40
130
-
100
0.2
-
-
0.4
±1
-
190
460
250
85
V
V
μA
μA
μA
μA
μA
V
mV
V
V
μA
kΩ
μA
μA
mA
mA
Input Current (A, B) (Note 5)
I
IN2
DE = 0V, V
CC
= 0V or
4.5 to 5.5V
-7V
≤
V
O
≤
12V
-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
-7V
≤
V
CM
≤
12V
Driver Three-State (high
impedance) Output Current (Y, Z)
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State (high impedance)
Receiver Output Current
Receiver Input Resistance
No-Load Supply Current (Note 3)
I
OZD
V
TH
ΔV
TH
V
OH
V
OL
I
OZR
R
IN
I
CC
ISL4489E, DE, DI, RE = 0V or V
CC
ISL4491E, DE, DI, RE = 0V or V
CC
DE = V
CC
, -7V
≤
V
Y
or V
Z
≤
12V (Note 4)
0V
≤
V
O
≤
V
CC
Driver Short-Circuit Current,
V
O
= High or Low
Receiver Short-Circuit Current
I
OSD1
I
OSR
4
FN6074.3
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