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1
FN6060.2
ISL4486, ISL81486
5V, Ultra High Speed, PROFIBUS,
RS-485/RS-422 Transceivers
The Intersil ISL4486 and ISL81486 are BiCMOS, 5V
powered, single transceivers that meet both the RS-485 and
RS-422 standards for balanced communication, and feature
the larger output voltage and higher data rate - up to
40Mbps - required by high speed PROFIBUS applications.
Unlike
competitive products, these Intersil devices are
specified for 10% tolerance supplies (4.5V to 5.5V) and
deliver at least a 2.3V differential output voltage over this
supply range. At the 5% tolerance specified by many
competitors, the ISL4486 delivers an unsurpassed 2.5V
differential signal into a 54
total load. This translates into
longer reach, or better data integrity, at the exceptional
40Mbps data rate.
SCSI applications benefit from the ISL4486's low receiver
and transmitter part-to-part skews, which make it perfect for
high speed parallel applications where large numbers of bits
must be simultaneously captured. The low bit-to-bit skew
eases the timing constraints on the data latching signal.
These devices present a "0.6 unit load" to the RS-485 bus,
which allows up to 50 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.
Features
Specified for 10% Tolerance Supplies
High Data Rates
ISL4486 . . . . . . . . . . . . . . . . . . . . . . . . . . up to 40Mbps
ISL81486 . . . . . . . . . . . . . . . . . . . . . . . . . up to 30Mbps
Large Differential Output Voltage . . . . . . . . . . 3V into 54
Low Bit-to-Bit (Part-to-Part) Skew for Parallel Applications
0.6 Unit Load Allows up to 50 Devices on the Bus
ISL81486 is a Drop-In Replacement for the ADM1486
Low Quiescent Current . . . . . . . . . . . . . . . . . . . . . 800
A
-7V to +12V Common Mode Input Voltage Range
Three-State Rx and Tx Outputs
14ns (Max) Propagation Delays, 2ns (Max) Skew
Operates from a Single +5V Supply (10% Tolerance)
Current Limiting and Thermal Shutdown for driver
Overload Protection
Pb-free available
Applications
SCSI "Fast 40" Drivers and Receivers
PROFIBUS DP and FMS Networks
Factory Automation
Field Bus Networks
Security Networks
Building Environmental Control Systems
Industrial/Process Control Networks
Ordering Information
PART NO. (BRAND)
TEMP.
RANGE (C)
PACKAGE
PKG.
DWG. #
ISL4486IB (4486IB)
-40 to 85
8 Ld SOIC
M8.15
ISL4486IBZ (4486IB)
(See Note)
-40 to 85
8 Ld SOIC
(Pb-free)
M8.15
ISL4486IU (4486)
-40 to 85
8 Ld MSOP
M8.118
ISL4486IUZ (4486)
(See Note)
-40 to 85
8 Ld MSOP
(Pb-free)
M8.118
ISL81486IB (81486IB)
-40 to 85
8 Ld SOIC
M8.15
ISL81486IBZ
(81486IB) (See Note)
-40 to 85
8 Ld SOIC
(Pb-free)
M8.15
ISL81486IU (1486)
-40 to 85
8 Ld MSOP
M8.118
ISL81486IUZ (1486)
(See Note)
-40 to 85
8 Ld MSOP
(Pb-free)
M8.118
*Add "-T" suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding
compounds/die attach materials and 100% matte tin plate termination finish, which
is 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-020B.
Pinout
ISL4486, ISL81486 (SOIC, MSOP)
TOP VIEW
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
CC
B/Z
A/Y
GND
D
R
Data Sheet
August 2004
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. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
2
Truth Table
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
B/Z
A/Y
X
1
1
0
1
X
1
0
1
0
X
0
X
High-Z
High-Z
Truth Table
RECEIVING
INPUTS
OUTPUT
RE
DE
A-B
RO
0
0
+0.2V
1
0
0
-0.2V
0
0
0
Inputs Open
1
1
X
X
High-Z
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
RS-485/422 level, noninverting receiver input and noninverting driver output. Pin is an input (A) if DE = 0; pin is an output (Y) if DE = 1.
B/Z
RS-485/422 level, inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is an output (Z) if DE = 1.
V
CC
System power supply input (4.5V to 5.5V).
Typical Operating Circuit
ISL4486
0.1
F
+
D
R
7
6
8
1
2
3
4
5
V
CC
GND
RO
RE
DE
DI
A/Y
B/Z
+5V
0.1
F
+
D
R
6
7
8
1
2
3
4
5
V
CC
GND
RO
RE
DE
DI
A/Y
B/Z
+5V
R
T
R
T
ISL4486, ISL81486
3
Absolute Maximum Ratings
Thermal Information
V
CC
to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
Input/Output Voltages
A/Y, B/Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V
CC
+0.5V)
Short Circuit Duration
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
Operating Conditions
Temperature Range
ISLXX86IX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40C to 85C
Thermal Resistance (Typical, Note 1)
JA
(C/W)
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . .
105
8 Ld MSOP Package . . . . . . . . . . . . . . . . . . . . . . . .
140
Maximum Junction Temperature (Plastic Package) . . . . . . . 150C
Maximum Storage Temperature Range . . . . . . . . . . . -65C to 150C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300C
(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 high 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
= 25C,
Note 2
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(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 = 50
(RS-422) (Figure 1A)
Full
2.5
3.7
-
V
R = 27
(RS-485), V
CC
4.75V (Figure 1A,
ISL4486 Only)
Full
2.5
3
5
V
R = 27
(RS-485), V
CC
= 4.5V (Figure 1A)
Full
2.3
-
5
V
R
D
= 60
, -7V V
CM
12V, V
CC
4.75V
(Figure 1B)
Full
2.4
-
-
V
Change in Magnitude of Driver
Differential V
OUT
for
Complementary Output States
V
OD
R = 27
or 50, (Figure 1A)
Full
-
0.01
0.2
V
Driver Common-Mode V
OUT
V
OC
R = 27
or 50 (Figure 1A)
Full
-
-
3
V
Change in Magnitude of Driver
Common-Mode V
OUT
for
Complementary Output States
V
OC
R = 27
or 50 (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, RE
Full
-1
-
1
A
Input Current (A/Y, B/Z) (Note 5)
I
IN2
DE = 0V, V
CC
= 0V or
4.5 to 5.5V
V
IN
= 12V
Full
-
-
0.6
mA
V
IN
= -7V
Full
-0.35
-
-
mA
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
-
40
-
mV
Receiver Output High Voltage
V
OH
I
O
= -4mA, V
ID
= 200mV
Full
4
-
-
V
Receiver Output Low Voltage
V
OL
I
O
= -4mA, V
ID
= 200mV
Full
-
-
0.4
V
Three-State (high impedance)
Receiver Output Current
I
OZR
0.4V
V
O
2.4V
Full
-
-
1
A
Receiver Input Resistance
R
IN
-7V
V
CM
12V (Note 7)
Full
20
-
-
k
No-Load Supply Current (Note 3)
I
CC
DI, RE = 0V or V
CC
DE = V
CC
Full
-
1
2
mA
DE = 0V
Full
-
0.8
1.5
mA
ISL4486, ISL81486
4
Driver Short-Circuit Current,
V
O
= High or Low
I
OSD1
DE = V
CC
, -7V
V
Y
or V
Z
12V (Note 4)
Full
60
-
250
mA
Receiver Short-Circuit Current
I
OSR
0V
V
O
V
CC
Full
7
-
85
mA
SWITCHING CHARACTERISTICS
Driver Input to Output Prop Delay
t
PLH
, t
PHL
R
DIFF
= 54
,
C
L
= 100pF (Figure 2)
ISL4486 Full
3
9
14
ns
ISL81486
Full
3
9
17
ns
Prop Delay Delta, Min-to-Max
t
DP-PSKEW
R
DIFF
= 54
, C
L
= 100pF, ISL4486 Only (Note 6,
Figure 2)
Full
-
0
6
ns
Driver Prop Delay Skew
t
SKEW
R
DIFF
= 54
, C
L
= 100pF (Figure 2)
Full
-
0
2
ns
Driver Differential Rise or Fall Time
t
R
, t
F
R
DIFF
= 54
,
C
L
= 100pF (Figure 2)
ISL4486
Full
-
5
8
ns
ISL81486
Full
-
7
15
ns
Driver Enable to Output High
t
ZH
C
L
= 50pF, SW = GND (Figure 3)
Full
-
9
15
ns
Driver Enable to Output Low
t
ZL
C
L
= 50pF, SW = V
CC
(Figure 3)
Full
-
9
15
ns
Matched Enable Switching
|t
AZH
- t
BZL
| or |t
BZH
- t
AZL
|
t
EN
At Identical Test Conditions (Figure 3)
Full
-
1
3
ns
Driver Disable from Output High
t
HZ
C
L
= 50pF, SW = GND (Figure 3)
Full
-
9
15
ns
Driver Disable from Output Low
t
LZ
C
L
= 50pF, SW = V
CC
(Figure 3)
Full
-
9
15
ns
Matched Disable Switching
|t
AHZ
- t
BLZ
| or |t
BHZ
- t
ALZ
|
t
DIS
At Identical Test Conditions (Figure 3)
Full
-
2
5
ns
Driver Maximum Data Rate
f
MAXD
|V
OD
|
1.5V (Figure 4) ISL4486
Full
40
-
-
Mbps
ISL81486
Full
30
-
-
Mbps
Receiver Input to Output Prop
Delay
t
PLH
, t
PHL
(Figure 5)
ISL4486
Full
11
17
25
ns
ISL81486
Full
6
17
25
ns
Prop Delay Delta, Min-to-Max
t
RP-PSKEW
ISL4486 Only (Note 6, Figure 5)
Full
-
0
9
ns
Receiver Prop Delay Skew
| t
PLH
- t
PHL
|
t
SKD
Figure 5
Full
-
0.5
3
ns
Receiver Enable to Output High
t
ZH
C
L
= 15pF, SW = GND (Figure 6)
Full
-
7
13
ns
Receiver Enable to Output Low
t
ZL
C
L
= 15pF, SW = V
CC
(Figure 6)
Full
-
7
13
ns
Receiver Disable from Output High
t
HZ
C
L
= 15pF, SW = GND (Figure 6)
Full
-
7
13
ns
Receiver Disable from Output Low
t
LZ
C
L
= 15pF, SW = V
CC
(Figure 6)
Full
-
7
13
ns
Receiver Maximum Data Rate
f
MAXR
C
L
= 15pF, V
ID
1.5V, RO t
H
and t
L
20ns
Full
40
-
-
Mbps
NOTES:
2. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless
otherwise specified.
3. Supply current specification is valid for loaded drivers when DE = 0V.
4. Applies to peak current. See "Typical Performance Curves" for more information.
5. Devices meeting these limits are denoted as "0.6 unit load (UL)" transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus, so
a 0.6UL transceiver permits > 50 devices on the bus.
6. This is the part-to-part skew between any two units tested with identical test conditions (Temperature, V
CC
, etc.).
Electrical Specifications
Test Conditions: V
CC
= 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at V
CC
= 5V, T
A
= 25C,
Note 2 (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(C)
MIN
TYP
MAX
UNITS
ISL4486, ISL81486
5
Test Circuits and Waveforms
FIGURE 1A. V
OD
AND V
OC
FIGURE 1B. V
OD
WITH COMMON MODE LOAD
FIGURE 1. DC DRIVER TEST CIRCUITS
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
D
DE
DI
V
CC
V
OD
V
OC
R
R
Z
Y
D
DE
DI
V
CC
V
OD
375
375
Z
Y
R
D
= 60
V
CM
-7V to +12V
D
DE
DI
V
CC
SIGNAL
GENERATOR
C
L
= 100pF
R
DIFF
Z
Y
C
L
= 100pF
OUT (Y)
3V
0V
t
PLH
1.5V
1.5V
V
OH
V
OL
50%
50%
t
PHL
OUT (Z)
t
PHL
V
OH
V
OL
50%
50%
t
PLH
DIFF OUT (Y - Z)
t
R
+V
OD
-V
OD
90%
90%
t
F
10%
10%
DI
SKEW =
|CROSSING PT. OF Y
& Z - CROSSING PT. OF Y & Z|
D
DE
DI
C
L
110
Z
Y
V
CC
GND
SW
PARAMETER OUTPUT
RE
DI
SW
C
L
(pF)
t
HZ
Y/Z
X
1/0
GND
50
t
LZ
Y/Z
X
0/1
V
CC
50
t
ZH
Y/Z
X
1/0
GND
50
t
ZL
Y/Z
X
0/1
V
CC
50
SIGNAL
GENERATOR
OUT (Y, Z)
3V
0V
1.5V
1.5V
V
OH
0V
2.3V
V
OH
- 0.5V
t
HZ
OUT (Y, Z)
V
CC
V
OL
2.3V
V
OL
+ 0.5V
t
LZ
DE
OUTPUT HIGH
OUTPUT LOW
t
ZL
t
ZH
ISL4486, ISL81486
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