®
ISL8483E, ISL8485E
Data Sheet
September 9, 2008
FN6048.9
ESD Protected to ±15kV, 5V, Low Power,
High Speed or Slew Rate Limited,
RS-485/RS-422 Transceivers
These Intersil RS-485, RS-422 devices are ESD protected,
BiCMOS 5V powered, single transceivers that meet both the
RS-485 and RS-422 standards for balanced communication.
Each driver output/receiver input is protected against ±15kV
ESD strikes, without latch-up. Unlike competitive devices,
this Intersil family is specified for 10% tolerance supplies
(4.5V to 5.5V).
The ISL8483E utilizes slew rate limited drivers which reduce
EMI, and minimize reflections from improperly terminated
transmission lines, or un-terminated stubs in multidrop and
multipoint applications.
Data rates up to 10Mbps are achievable by using the
ISL8485E which features higher slew rates.
Both 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.
These half duplex configurations multiplex the Rx inputs and
Tx outputs to allow transceivers with Rx and Tx disable
functions in 8 lead packages.
Features
• Pb-Free Available (RoHS Compliant)
• Military and Extended Industrial Temperature Options
(+125°C)
• RS-485 I/O Pin ESD Protection
. . . . . . . . . . . . . ±
15kV
HBM
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Specified for 10% Tolerance Supplies
• High Data Rate Version (ISL8485E) . . . . . up to 10Mbps
• Slew Rate Limited Version for Error Free Data
Transmission (ISL8483E) . . . . . . . . . . . . . up to 250kbps
• Single Unit Load Allows up to 32 Devices on the Bus
• 1nA Low Current Shutdown Mode (ISL8483E)
• Low Quiescent Current:
- 160µA (ISL8483E)
- 500µA (ISL8485E)
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs
• 30ns Propagation Delays, 5ns Skew (ISL8485E)
• Operate 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
NO. OF
DEVICES
ALLOWED DATA RATE
PART
HALF/FULL
MIL
(Mbps)
NUMBER
DUPLEX TEMP? ON BUS
ISL8483E
ISL8485E
Half
Half
No
Yes
32
32
0.25
10
SLEW-RATE
LIMITED?
Yes
No
RECEIVER/DRIVER QUIESCENT LOW POWER
PIN
ENABLE?
I
CC
(
µ
A)
SHUTDOWN? COUNT
Yes
Yes
160
500
Yes
No
8
8
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, 2004, 2005, 2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
ISL8483E, ISL8485E
Pinout
ISL8483E, ISL8485E
(8 LD PDIP, SOIC)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
D
8
7
6
5
V
CC
B/Z
A/Y
GND
Ordering Information
PART NUMBER
ISL8483ECPZ
(Note)
ISL8483EIB**
ISL8483EIBZ**
(Note)
ISL8483EIP
PART
MARKING
ISL8483ECPZ
8483EIB
8483EIBZ
ISL8483EIP
ISL8483EIPZ
8485EABZ
8485ECB
TEMP.
RANGE
(°C)
-0 to +70
PKG.
PACKAGE DWG. #
8 Ld PDIP* E8.3
(Pb-free)
R
-40 to +85 8 Ld SOIC M8.15
-40 to +85 8 Ld SOIC M8.15
(Pb-free)
-40 to +85 8 Ld PDIP E8.3
-40 to +85 8 Ld PDIP* E8.3
(Pb-free)
-40 to +125 8 Ld SOIC M8.15
(Pb-free)
0 to +70
0 to +70
0 to +70
0 to +70
8 Ld SOIC M8.15
8 Ld SOIC M8.15
(Pb-free)
8 Ld PDIP E8.3
8 Ld PDIP* E8.3
(Pb-free)
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 *
ISL8483EIPZ
(Note)
ISL8485EABZ**
(Note)
ISL8485ECB**
ISL8485ECBZ** 8485ECBZ
(Note)
ISL8485ECP
ISL8485ECPZ
(Note)
ISL8485EIB**
ISL8485EIBZ**
(Note)
ISL8485ECP
ISL8485ECPZ
8485EIB
8485EIBZ
ISL8485EIP
ISL8485EIPZ
*Shutdown Mode for ISL8483E (see Note 7)
-40 to +85 8 Ld SOIC M8.15
-40 to +85 8 Ld SOIC M8.15
(Pb-free)
-40 to +85 8 Ld PDIP E8.3
-40 to +85 8 Ld PDIP* E8.3
(Pb-free)
RECEIVING
INPUTS
RE
0
0
0
1
1
DE
0
0
0
0
1
A-B
≥
+0.2V
≤
-0.2V
Inputs Open
X
X
OUTPUT
RO
1
0
1
High-Z*
High-Z
ISL8485EIP
ISL8485EIPZ
(Note)
ISL8485EMPZ
(Note)
ISL8485EMPZ -55 to +125 8 Ld PDIP* E8.3
(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.
**Add “-T” suffix for tape and reel. Please refer to TB347 for details
on reel specifications
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate plus anneal- (e3 termination
finish, which is 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.
*Shutdown Mode for ISL8483E (see Note 7)
2
FN6048.9
September 9, 2008
ISL8483E, ISL8485E
Pin Descriptions
PIN
RO
RE
DE
DI
GND
A/Y
B/Z
V
CC
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, RS485, RS4-422 level noninverting receiver input and noninverting driver output. Pin is an input (A) if
DE = 0; pin is an output (Y) if DE = 1.
±15kV HBM ESD Protected, RS485, RS4-422 level inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0;
pin is an output (Z) if DE = 1.
System power supply input (4.5V to 5.5V).
Typical Operating Circuits
ISL8483E, ISL8485E
+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
0.1µF
0.1µF
D
GND
5
GND
5
R
3
FN6048.9
September 9, 2008
ISL8483E, ISL8485E
Absolute Maximum Ratings
V
CC
to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V
CC
+0.5V)
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
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical, Note 1)
θ
JA
(°C/W)
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . .
170
8 Ld PDIP Package* . . . . . . . . . . . . . . . . . . . . . . . .
140
Maximum Junction Temperature (Plastic Package) . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
*Pb-free PDIPs can be used for through hole wave solder processing
only. They are not intended for use in reflow solder processing
applications.
Operating Conditions
Temperature Range
ISL8485ECx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
ISL848xEIx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
ISL8485EAx . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +125°C
ISL8485EMx. . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
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
MIN
(°C) (Note 12)
TYP
MAX
(Note 12) 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), (Figure1)
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
I
IN1
I
IN1
DE, DI, RE
DE, DI, RE
DE, DI, RE (ISL8483E)
DI (ISL8485E)
DE,
RE (ISL8485E)
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
-7V
≤
V
CM
≤
12V
V
IN
= 12V
V
IN
= -7V
Full
Full
Full
Full
Full
Full
Full
Full
25
Full
Full
Full
Full
2
-
-2
-2
-25
-
-
-0.2
-
3.5
-
-
12
-
-
-
-
-
-
-
-
70
-
-
-
-
-
0.8
2
2
25
1
-0.8
0.2
-
-
0.4
±1
-
V
V
µA
µA
µA
mA
mA
V
mV
V
V
µA
kΩ
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
Receiver Input Resistance
V
TH
ΔV
TH
V
OH
V
OL
I
OZR
R
IN
4
FN6048.9
September 9, 2008
ISL8483E, ISL8485E
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)
(Continued)
SYMBOL
I
CC
TEST CONDITIONS
ISL8485E, DI, RE = 0V or V
CC
DE = V
CC
DE = 0V
ISL8483E, DI, RE = 0V or V
CC
DE = V
CC
DE = 0V
Shutdown Supply Current
Driver Short-Circuit Current,
V
O
= High or Low
Receiver Short-Circuit Current
I
SHDN
I
OSD1
I
OSR
ISL8483E, DE = 0V, RE = V
CC
, DI = 0V or V
CC
DE = V
CC
, -7V
≤
V
Y
or V
Z
≤
12V, (Note 4)
0V
≤
V
O
≤
V
CC
TEMP
MIN
(°C) (Note 12)
Full
Full
Full
Full
Full
Full
Full
-
-
-
-
-
35
7
TYP
700
500
470
160
1
-
-
MAX
(Note 12) UNITS
900
565
650
250
50
250
85
µA
µA
µA
µA
nA
mA
mA
PARAMETER
No-Load Supply Current, (Note 3)
SWITCHING CHARACTERISTICS (ISL8485E)
Driver Input to Output Delay
Driver Output Skew
Driver Differential Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Receiver Input to Output Delay
Receiver Skew | t
PLH
- t
PHL
|
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
Maximum Data Rate
t
PLH
, t
PHL
R
DIFF
= 54Ω, C
L
= 100pF, (Figure 2)
t
SKEW
t
R
, t
F
t
ZH
t
ZL
t
HZ
t
LZ
R
DIFF
= 54Ω, C
L
= 100pF, (Figure 2)
R
DIFF
= 54Ω, C
L
= 100pF, (Figure 2)
C
L
= 100pF, SW = GND, (Figure 3)
C
L
= 100pF, SW = V
CC
, (Figure 3)
C
L
= 15pF, SW = GND, (Figure 3)
C
L
= 15pF, SW = V
CC
, (Figure 3)
Full
Full
Full
Full
Full
Full
Full
Full
25
Full
Full
Full
Full
Full
18
-
3
-
-
-
-
30
-
-
-
-
-
10
30
2
11
17
14
19
13
40
5
9
9
9
9
-
50
10
25
70
70
70
70
150
-
50
50
50
50
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Mbps
t
PLH
, t
PHL
(Figure 4)
t
SKD
t
ZH
t
ZL
t
HZ
t
LZ
f
MAX
(Figure 4)
C
L
= 15pF, SW = GND, (Figure 5)
C
L
= 15pF, SW = V
CC
, (Figure 5)
C
L
= 15pF, SW = GND, (Figure 5)
C
L
= 15pF, SW = V
CC
, (Figure 5)
(Note 11)
SWITCHING CHARACTERISTICS (ISL8483E)
Driver Input to Output Delay
Driver Output Skew
Driver Differential Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Receiver Input to Output Delay
Receiver Skew | t
PLH
- t
PHL
|
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
Maximum Data Rate
Time to Shutdown
Driver Enable from Shutdown to
Output High
t
PLH
, t
PHL
R
DIFF
= 54Ω, C
L
= 100pF, (Figure 2)
t
SKEW
t
R
, t
F
t
ZH
t
ZL
t
HZ
t
LZ
R
DIFF
= 54Ω, C
L
= 100pF, (Figure 2)
R
DIFF
= 54Ω, C
L
= 100pF, (Figure 2)
C
L
= 100pF, SW = GND, (Figure 3), (Note 5)
C
L
= 100pF, SW = V
CC
, (Figure 3), (Note 5)
C
L
= 15pF, SW = GND, (Figure 3)
C
L
= 15pF, SW = V
CC
, (Figure 3)
Full
Full
Full
Full
Full
Full
Full
Full
25
Full
Full
Full
Full
Full
Full
Full
250
-
250
250
250
300
300
250
-
-
-
-
-
250
50
-
800
160
800
-
-
-
-
350
25
10
10
10
10
-
200
-
2000
800
2000
2000
2000
3000
3000
2000
-
50
50
50
50
-
600
2000
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kbps
ns
ns
t
PLH
, t
PHL
(Figure 4)
t
SKD
t
ZH
t
ZL
t
HZ
t
LZ
f
MAX
t
SHDN
(Figure 4)
C
L
= 15pF, SW = GND, (Figure 5), (Note 6)
C
L
= 15pF, SW = V
CC
, (Figure 5), (Note 6)
C
L
= 15pF, SW = GND, (Figure 5)
C
L
= 15pF, SW = V
CC
, (Figure 5)
(Note 11)
(Note 7)
t
ZH(SHDN)
C
L
= 100pF, SW = GND, (Figure 3), (Notes 7, 8)
5
FN6048.9
September 9, 2008
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