IL422 NVE, IL422 Datasheet - Page 6

• Manufacturer Part Number: IL422
• Description: ISOLATOR RS422/485 INTFC 16SOICW
• Manufacturer: NVE
• Series: IsoLoop®r

Specifications of IL422

• Inputs - Side 1/side 2: RS-422
• Number Of Channels: 2
• Isolation Rating: 2500Vrms
• Voltage - Supply: 4.25V, 5V
• Data Rate: 25Mbps
• Propagation Delay: 27ns
• Output Type: Logic
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 390-1000

Application Information
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.
Electromagnetic Compatibility
The IL422 is fully compliant with generic EMC standards
EN50081, EN50082-1 and the umbrella line-voltage standard for
Information Technology Equipment (ITE) EN61000. The IsoLoop
Isolator’s Wheatstone bridge configuration and differential
magnetic field signaling ensure excellent EMC performance against
all relevant standards. NVE conducted compliance tests in the
categories below:
EN50081-1
EN50082-2: Industrial Environment
ENV50204
Immunity to external magnetic fields is even higher if the field
direction is “end-to-end” rather than to “pin-to-pin” as shown in the
diagram below:
Residential, Commercial & Light Industrial
Methods EN55022, EN55014
Methods EN61000-4-2 (ESD), EN61000-4-3 (Electromagnetic
Field Immunity), EN61000-4-4 (Electrical Transient Immunity),
EN61000-4-6 (RFI Immunity), EN61000-4-8 (Power Frequency
Magnetic Field Immunity), EN61000-4-9 (Pulsed Magnetic
Field), EN61000-4-10 (Damped Oscillatory Magnetic Field)
Radiated Field from Digital Telephones (Immunity Test)
NVE Corporation
Cross-axis Field Direction
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
6
Telephone: [phone]
Dynamic Power Consumption
IsoLoop Isolators achieve their low power consumption from the
way 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
2.5 ns, the power consumption is independent of mark-to-space
ratio and solely dependent on frequency. This has obvious
advantages over optocouplers, which have power consumption
heavily dependent on frequency and time.
The approximate power supply current per channel is:
I
Where f = operating frequency
Power Supply Decoupling
Low ESR capacitors such as ceramic are required to decouple the
supplies. Both V
capacitors. These should be placed as close as possible to V
for proper operation. Additionally, V
tantalum capacitor connected in parallel with the 47 nF capacitor.
IN
= 40 x f
f
MAX
= 50 MHz
f
MAX
x 1 mA
DD1
4
and V
Fax [phone]
DD2
must be bypassed with 47 nF
DD2
Internet: www.isoloop.com
should have a 10 µF
IL422
DD
pins