IL422-3V
Isolated 3Volt RS422/RS485 Interface
Functional Diagram
Features
I
SO
L
OOP
®
·
3.3 V Input Supply Compatible
·
2500 V
RMS
Isolation (1 min)
·
25 ns Propagation Delay
·
25 MBaud Data Rate
·
1 ns Pulse Skew (typ)
·
±60 mA Driver Output Capability
·
Thermal Shutdown Protection
·
Meets or Exceeds EIA 422-B, EIA 485-A and
Function Table
V
ID
1
(Y-Z)
X
V
ID
2
(A-B)
≥
0.2V
DE RE ISODE R D
X
X
X
H
H
L
L
L
H
L
L
L
X
X
X
H
H
L
H X
L
Z
L
X
X
L
MODE
Receive
Receive
Receive/Drive
Drive
Drive
Receive
ITU Recommendation V11
·
-40°C to +85°C Temperature Range
·
16 Pin SOIC Package
·
PROFIBUS International Component Recognition
·
UL 1577 Approval Pending
·
IEC 61010-1 Approval Pending
Applications
Multi-point or Multi-drop Transmission on Long Bus Lines
in Noisy Environments
≤ −0.2V
X
-7<V
ID1
<12 -7<V
ID2
<12
≥
1.5
≤−1.5
X
X
Open
H H
H X
Description
The IL422-3V is a galvanically isolated, high speed differential
driver and receiver pair, designed for bidirectional data
communication on balanced transmission lines. Isolation is
achieved through patented
*
Isoloop
®
technology. The IL422-3V
is the first isolated RS-422 interface available in a standard 16
pin SOIC package, which meets the ANSI Standards
EIA/TIA-422-B and RS485.
The IL422-3V has current limiting and thermal shutdown
features to protect against output short circuits and bus
contention situations where these may cause excessive power
dissipation.
Isoloop
®
is a registered trademark of NVE Corporation
* US Patent number 5,831,426; 6,300,617 and others
H= High Level, L= Low Level,
X= Irrelevant, Z= High Impedance
Ordering Information
IL422-3V
IL422E-3V
IL422-3VTR
IL422E-3VTR
Standard 3V Part Number
Lead Free
Tape and Reel
Lead Free/Tape and Reel
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax: (952) 829-9189
Internet: www.isoloop.com
IL422-3V
Absolute Maximum Ratings
Parameters
Storage Temperature
Ambient Operating Temperature
Voltage Range at A or B Bus Pins
Supply Voltage
(1)
Digital Input Voltage
Digital Output Voltage
Continuous Total Power Dissipation
Maximum Output Current
Lead Solder Temperature (10s)
ESD
I
SO
L
OOP
®
Symbol
T
S
T
A
V
DD
1,V
DD
2
Min.
-65
-40
-7
-0.5
-0.5
-0.5
Max.
150
85
12
7
5.5
V
DD
+ 0.1
725
377
95
Units
o
C
o
C
V
V
V
V
mW (25°C)
mW (85°C)
mA
°C
I
O
260
2kV Human Body Model
Insulation Specifications
Parameter
Creepage Distance (External)
Barrier Impedance
Leakage Current
Condition
240 V
RMS
60Hz
Min.
8.077
Typ.
>10
14
||7
0.2
Max.
Units
mm
Ω ||
pF
µA
Recommended Operating Conditions
Parameters
Supply Voltage
Input Voltage at any bus terminal
(separately or common mode)
High-Level Digital Input Voltage
(VDD1=3.3 V)
(VDD1=5.0 V)
Symbol
V
DD
1
V
DD
2
V
I
V
IC
V
IH
V
IL
V
ID
I
OH
I
OH
I
OL
I
OL
T
A
t
IR
,t
IF
Min.
3.0
4.5
Max.
5.5
5.5
12
-7
Units
V
V
2.4
3.0
0.8
±12
-60
8
60
8
-40
85
DC Stable
V
V
V
mA
mA
mA
mA
°C
Low-Level Digital Input Voltage
Differential Input Voltage
(2)
High-Level Output Current (Driver)
High-Level Digital Output Current (Receiver)
Low-Level Output Current (Driver)
Low-Level Digital Output Current (Receiver)
Operating Free Air Temperature
Digital Input Signal Rise and Fall Times
IEC61010-1
TUV Certificate Numbers:
Pending
Classification as Table 1.
Model
IL422
Pollution
Degree
II
Material
Group
III
Max Working
Voltage
300 V
RMS
Package
Type
16–SOIC (0.3'')
UL 1577
Component Recognition program. File #
Pending
Rated 2500Vrms for 1min.
2
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (612) 829-9217
Fax: (612) 829-9189
Internet: www.isoloop.com
IL422-3V
Driver Section
All Specifications are Tmin to Tmax unless otherwise stated.
Parameter
Input Clamp Voltage
Output Voltage
Differential Output Voltage
Differential Output Voltage
(6)
Differential Output Voltage
Change in Magnitude of
(7)
Differential Output Voltage
Common Mode Output Voltage
Change in Magnitude of
(7)
Common Mode Output Voltage
Output Current
(4)
High Level Input Current
Low Level Input Current
Short-Circuit Output Current
Symbol
V
IK
V
O
|V
OD
1|
|V
OD
2|
V
OD
3
∆|V
OD
|
V
OC
∆|V
OC
|
I
O
I
IH
I
IL
I
OS
Min.
0
1.5
1.5
1.5
Typ.
(5)
Max.
-1.5
6
6
5
5
±0.2
3
-1
±0.2
1
-0.8
10
-10
-250
-150
250
34
10
7
Max.
25
6
10
65
35
50
32
8
Units
V
V
V
V
V
V
V
V
mA
mA
µA
µA
mA
Test Conditions
I
L
=-18mA
I
O
=0
I
O
=0
R
L
=54Ω
Vtest=-7 to 12V
R
L
=54 or 100Ω
R
L
=54 or 100Ω
R
L
=54 or 100Ω
Output Disabled V
O
=12
V
O
=-7
V1=3.5 V
V1=0.4 V
V
O
= -6
V
O
= 0
V
O
= 8
No Load (Outputs Enabled)
I
SO
L
OOP
®
2.5
Supply Current (V
DD
2= +5V)
(V
DD
1= +5V)
(V
DD
1= +3.3V)
Switching Characteristics
Parameter
Maximum Data Rate
Differential Output Delay Time
Pulse Skew
(10)
Differential Output Transition Time
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Skew Limit
(3)
I
DD
2
I
DD
1
I
DD
1
Symbol
t
D
(
OD
)
t
SK
(
P
)
t
T
(
OD
)
t
PZH
t
PZL
t
PHZ
t
PLZ
t
SK
(
LIM
)
Min.
25
27
5
3.2
Typ.
(5)
16
1
8
31
22
28
16
2
mA
Units
Mbd
ns
ns
ns
ns
ns
ns
ns
ns
Test Conditions
R
L
=54Ω, C
L
=50pF
R
L
=54Ω, C
L
=50pF
R
L
=54Ω, C
L
=50pF
R
L
=54Ω, C
L
=50pF
R
L
=54Ω, C
L
=50pF
R
L
=54Ω, C
L
=50pF
R
L
=54Ω, C
L
=50pF
R
L
=54Ω, C
L
=50pF
R
L
=54Ω, C
L
=50pF
3
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (612) 829-9217
Fax: (612) 829-9189
Internet: www.isoloop.com
IL422-3V
Parameter
Positive-going Input Threshold Voltage
Negative-going Input Threshold Voltage
Hysteresis Voltage (V
IT
+ - V
IT
-)
High Level Digital Output Voltage
Low Level Digital Output Voltage
High-impedance-state output current
Line Input Current
Input Resistance
Supply Current
(V
DD
2= +5V)
(V
DD
1= +5V)
(V
DD
1= +3.3V)
(8)
I
SO
L
OOP
®
Receiver Section
All Specifications are Tmin to Tmax unless otherwise stated.
Symbol
V
IT
+
V
IT
-
Vhys
V
OH
V
OL
I
OZ
I
I
r
I
I
DD
2
I
DD
1
I
DD
1
Symbol
t
PD
t
SK
(
P
)
t
SK
(lim)
t
PZH
t
PZL
t
PHZ
t
PLZ
Min.
25
50
27
5
3.2
34
10
7
V
DD
– 0.2
0.2
±10
1
-0.8
kΩ
mA
No Load (Outputs Enabled)
–0.2
60
Min.
Typ.
(5)
Max.
0.2
Units
V
V
mV
V
V
µA
mA
V
ID
= 200mV, I
OH
= -20µA
V
ID
= -200mV, I
OL
= 20µA
V
O
= 0.4 to (V
DD
2 - 0.5) V
Other Input
(11)
= 0V V
I
=12V
V
I
= –7V
Test Conditions
V
O
= 2.7V, Io= - 0.4mA
V
O
= 0.5V, Io= 8mA
Switching Characteristics @ 5V
Parameter
Maximum Data Rate
Propagation Time
(9)
Pulse Skew
(10)
(3)
Typ.
(5)
24
1
2
17
30
30
18
Max.
32
6
8
24
45
45
27
Units
Mbd
ns
ns
ns
ns
ns
ns
ns
Test Conditions
R
L
=54Ω, C
L
=50pF
V
O
=-1.5 to 1.5V, C
L
=15pF
V
O
=-1.5 to 1.5V, C
L
=15pF
R
L
=54Ω, C
L
=50pF
C
L
=15pF
C
L
=15pF
C
L
=15pF
C
L
=15pF
Skew Limit
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Switching Characteristics @ 3.3V
Parameter
Maximum Data Rate
Propagation Time
(9)
Pulse Skew
(10)
(3)
Symbol
t
PD
t
SK
(
P
)
t
SK
(lim)
t
PZH
t
PZL
t
PHZ
t
PLZ
Min.
25
Typ.
(5)
27
2
4
20
33
33
20
Max.
32
6
8
24
45
45
27
Units
Mbd
ns
ns
ns
ns
ns
ns
ns
Test Conditions
R
L
=54Ω, C
L
=50pF
V
O
=-1.5 to 1.5V, C
L
=15pF
V
O
=-1.5 to 1.5V, C
L
=15pF
R
L
=54Ω, C
L
=50pF
C
L
=15pF
C
L
=15pF
C
L
=15pF
C
L
=15pF
Skew Limit
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Electrostatic Discharge Sensitivity
This product has been tested for electrostatic sensitivity to the limits stated in the specifications. However, NVE
recommends that all integrated circuits be handled with appropriate care to avoid damage. Damage caused by
inappropriate handling or storage could range from performance degradation to complete failure.
4
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (612) 829-9217
Fax: (612) 829-9189
Internet: www.isoloop.com
IL422-3V
Notes:
All Voltage values are with respect to network ground
except differential I/O bus voltages.
2. Differential input/output voltage is measured at the
noninverting terminal A/Y with respect to the inverting
terminal B/Z.
3. Skew limit is the maximum difference in any two channels
in one device.
4. The power-off measurement in ANSI Standard
EIA/TIA-422-B applies to disabled outputs only and is not
applied to combined inputs and outputs.
5. All typical values are at V
DD
1
,V
DD
2
= 5V and T
A
= 25°C.
6. The minimum V
OD
2
with a 100Ω load is either ½V
OD
1
or
2V, whichever is greater.
7.
∆|V
OD
| and
∆|V
OC
| are the changes in magnitude of V
OD
and V
OC
, respectively, that occur when the input is changed
form one logic state to the other.
8. This applies for both power on and power off, refer to
ANSI standard RS-485 for exact condition. The EIA/TIA-
422-B limit does not apply for a combined driver and
receiver terminal.
9. Includes 8 ns read enable time. Maximum propagation
delay is 25 ns after read assertion.
10. Pulse skew is defined as the |t
PLH
-t
PHL
| of each channel.
1.
I
SO
L
OOP
®
Application Notes:
Power Consumption
Isoloop
®
devices achieve their low power consumption from
the manner by which they transmit data across the isolation
barrier. By detecting the edge transitions of the input logic
signal and converting these to narrow current pulses a
magnetic field is created around the GMR Wheatstone
bridge. Depending on the direction of the magnetic field,
the bridge causes the output comparator to switch following
the input logic signal. Since the current pulses are narrow,
about 2.5ns wide, the power consumption is independent of
mark-to-space ratio and solely dependent on frequency. This
has obvious advantages over optocouplers whose power
consumption is heavily dependent on its on-state and
frequency.
The approximate power supply current per channel for
Power Supplies
It is recommended that low ESR ceramic capacitors be
used to decouple the supplies. Both V
DD
1
and V
DD
2
should
be bypassed with 47 nF capacitors. These should be placed
no further than 1 cm from the device pins for proper
operation. In addition, V
DD
2
should have a 10
µF
tantalum
capacitor connected in parallel with the 47 nF capacitor.
5
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (612) 829-9217
Fax: (612) 829-9189
Internet: www.isoloop.com
NXP MCU
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
