1
®
FN6052.2
ISL83483, ISL83485, ISL83488,
ISL83490, ISL83491
3.3V, Low Power, High Speed or Slew
Rate Limited, RS-485/RS-422 Transceivers
These Intersil RS-485/RS-422 devices are BiCMOS 3.3V
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 (3V to 3.6V).
The ISL83483 and ISL83488 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 10Mbps are achievable by using the
ISL83485, ISL83490, or ISL83491, which feature higher
slew rates.
Logic inputs (e.g., DI and DE) accept signals in excess of
5.5V, making them compatible with 5V logic families.
Receiver (Rx) inputs feature a "fail-safe if open" design,
which ensures a logic high output if Rx inputs are floating. All
devices present a "single unit load" to the RS-485 bus, which
allows up to 32 transceivers on the network.
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 ISL83488, ISL83490, ISL83491 are configured for full
duplex (separate Rx input and Tx output pins) applications.
The ISL83488 and ISL83490 are offered in space saving 8
lead packages for applications not requiring Rx and Tx
output disable functions (e.g., point-to-point and RS-422).
Half duplex configurations (ISL83483, ISL83485) multiplex
the Rx inputs and Tx outputs to provide transceivers with Rx
and Tx disable functions in 8 lead packages.
Features
· Operate from a Single +3.3V Supply (10% Tolerance)
· Interoperable with 5V Logic
· High Data Rates. . . . . . . . . . . . . . . . . . . . . up to 10Mbps
· Single Unit Load Allows up to 32 Devices on the Bus
· Slew Rate Limited Versions for Error Free Data
Transmission (ISL83483, ISL83488) . . . . . .up to 250kbps
· Low Current Shutdown Mode (ISL83483, ISL83485,
ISL83491). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15nA
· -7V to +12V Common Mode Input Voltage Range
· Three State Rx and Tx Outputs (Except ISL83488,
ISL83490)
· 10ns Propagation Delay, 1ns Skew (ISL83485, ISL83490,
ISL83491)
· Full Duplex and Half Duplex Pinouts
· 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
HALF/FULL
DUPLEX
DATA RATE
(Mbps)
SLEW-RATE
LIMITED?
RECEIVER/DRIVER
ENABLE?
QUIESCENT I
CC
(mA)
LOW POWER
SHUTDOWN?
PIN COUNT
ISL83483
Half
0.25
Yes
Yes
0.65
Yes
8
ISL83485
Half
10
No
Yes
0.65
Yes
8
ISL83488
Full
0.25
Yes
No
0.65
No
8
ISL83490
Full
10
No
No
0.65
No
8
ISL83491
Full
10
No
Yes
0.65
Yes
14
Data Sheet
December 2003
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. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
2
Pinouts
ISL83483, ISL83485 (PDIP, SOIC)
TOP VIEW
ISL83488, ISL83490 (PDIP, SOIC)
TOP VIEW
ISL83491 (PDIP, SOIC)
TOP VIEW
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
CC
B/Z
A/Y
GND
D
R
V
CC
RO
DI
GND
1
2
3
4
8
7
6
5
A
B
Z
Y
D
R
NC
RO
RE
DE
DI
GND
GND
V
CC
V
CC
A
B
Z
Y
NC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
D
R
Ordering Information
PART NO.
(BRAND)
TEMP.
RANGE (
o
C)
PACKAGE
PKG. DWG. #
ISL83483IB
(83483IB)
-40 to 85
8 Ld SOIC
M8.15
ISL83483IP
-40 to 85
8 Ld PDIP
E8.3
ISL83485IB
(83485IB)
-40 to 85
8 Ld SOIC
M8.15
ISL83485IP
-40 to 85
8 Ld PDIP
E8.3
ISL83488IB
(83488IB)
-40 to 85
8 Ld SOIC
M8.15
ISL83488IP
-40 to 85
8 Ld PDIP
E8.3
ISL83490IB
(83490IB)
-40 to 85
8 Ld SOIC
M8.15
ISL83490IP
-40 to 85
8 Ld PDIP
E8.3
ISL83491IB
-40 to 85
14 Ld SOIC
M14.15
ISL83491IP
-40 to 85
14 Ld PDIP
E14.3
NOTE: SOIC also available in Tape and Reel; Add "-T" to suffix.
Truth Tables
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
Z
Y
X
1
1
0
1
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
High-Z *
High-Z *
NOTE: *Shutdown Mode for ISL83483, ISL83485, ISL83491
RECEIVING
INPUTS
OUTPUT
RE
DE
Half Duplex
DE
Full Duplex
A-B
RO
0
0
X
+0.2V
1
0
0
X
-0.2V
0
0
0
X
Inputs Open
1
1
0
0
X
High-Z *
1
1
1
X
High-Z
NOTE: *Shutdown Mode for ISL83483, ISL83485, ISL83491
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
3
Pin Descriptions
PIN
FUNCTION
RO
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).
RE
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.
DE
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low.
DI
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.
GND
Ground connection.
A/Y
Noninverting receiver input and noninverting driver output. Pin is an input if DE = 0; pin is an output if DE = 1.
B/Z
Inverting receiver input and inverting driver output. Pin is an input if DE = 0; pin is an output if DE = 1.
A
Noninverting receiver input.
B
Inverting receiver input.
Y
Noninverting driver output.
Z
Inverting driver output.
V
CC
System power supply input (3V to 3.6V).
NC
No Connection.
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
4
Typical Operating Circuits
ISL83483, ISL83485
ISL83488, ISL83490
ISL83491
0.1
µ
F
+
D
R
7
6
8
1
2
3
4
5
V
CC
GND
RO
RE
DE
DI
A/Y
B/Z
+3.3V
0.1
µ
F
+
D
R
6
7
8
1
2
3
4
5
V
CC
GND
RO
RE
DE
DI
A/Y
B/Z
+3.3V
R
T
R
T
0.1
µ
F
+
D
R
8
7
6
5
1
2
3
4
V
CC
GND
RO
DI
A
B
Y
Z
+3.3V
0.1
µ
F
+
D
R
8
7
6
5
1
2
3
4
V
CC
GND
RO
DI
A
B
Y
Z
+3.3V
R
T
R
T
0.1
µ
F
+
D
R
12
11
10
9
13, 14
2
3
4
5
6, 7
V
CC
GND
RO
RE
DE
DI
A
B
Y
Z
+3.3V
0.1
µ
F
+
D
R
12
11
10
9
13,14
2
3
4
5
6, 7
V
CC
GND
RO
RE
DE
DI
A
B
Y
Z
+3.3V
R
T
R
T
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
5
Absolute Maximum Ratings
Thermal Information
V
CC
to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to +7V
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
Operating Conditions
Temperature Range
ISL834XXIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85
o
C
Thermal Resistance (Typical, Note 1)
JA
(
o
C/W)
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . .
170
8 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . .
140
14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
130
14 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . .
105
Maximum Junction Temperature (Plastic Package) . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
o
C
(SOIC- Lead Tips Only)
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
= 3V to 3.6V; Unless Otherwise Specified. Typicals are at V
CC
= 3.3V, T
A
= 25
o
C,
Note 2
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
Driver Differential V
OUT
(no load)
V
OD1
Full
-
-
V
CC
V
Driver Differential V
OUT
(with load)
V
OD2
R
L
= 100
(RS-422) (Figure 1A)
Full
2
2.7
-
V
R
L
= 54
(RS-485) (Figure 1A)
Full
1.5
2.3
V
CC
V
R
L
= 60
, -7V
V
CM
12V (Figure 1B)
Full
1.5
2.6
-
V
Change in Magnitude of Driver
Differential V
OUT
for
Complementary Output States
V
OD
R
L
= 54
or 100
(Figure 1A)
Full
-
0.01
0.2
V
Driver Common-Mode V
OUT
V
OC
R
L
= 54
or 100
(Figure 1A)
Full
-
1.8
3
V
Change in Magnitude of Driver
Common-Mode V
OUT
for
Complementary Output States
V
OC
R
L
= 54
or 100
(Figure 1A)
Full
-
0.01
0.2
V
Logic Input High Voltage
V
IH
DE, DI, RE
Full
2
-
-
V
Logic Input Low Voltage
V
IL
DE, DI, RE
Full
-
-
0.8
V
Logic Input Current
I
IN1
DE, DI
Full
-2
-
2
µ
A
RE
Full
-25
-
25
µ
A
Input Current (A, B)
I
IN2
DE = 0V, V
CC
= 0V or 3.6V
V
IN
= 12V
Full
-
0.6
1
mA
V
IN
= -7V
Full
-
-0.3
-0.8
mA
Output Leakage Current (Y, Z)
(ISL83491)
I
IN3
RE = 0V, DE = 0V, V
CC
= 0V or 3.6V V
IN
= 12V
Full
-
14
20
µ
A
V
IN
= -7V
Full
-20
-11
-
µ
A
Output Leakage Current (Y, Z)
in Shutdown Mode (ISL83491)
I
IN3
RE = V
CC
, DE = 0V, V
CC
= 0V or 3.6V V
IN
= 12V
Full
-
0.03
1
µ
A
V
IN
= -7V
Full
-1
-0.01
-
µ
A
Receiver Differential Threshold
Voltage
V
TH
-7V
V
CM
12V
Full
-0.2
-
0.2
V
Receiver Input Hysteresis
V
TH
V
CM
= 0V
25
-
50
-
mV
Receiver Output High Voltage
V
OH
I
O
= -4mA, V
ID
= 200mV
Full
V
CC
-
0.4
-
-
V
Receiver Output Low Voltage
V
OL
I
O
= -4mA, V
ID
= 200mV
Full
-
-
0.4
V
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
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