IL3085

9

NVE Corporation

11409 Valley View Road, Eden Prairie, MN 55344-3617

(952) 829-9217

www.nve.com

YouTube.com/NveCorporation

iso-apps@nve.com

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.

Pinout Differences Between Packages

QSOP and narrow-body version (IL3085-1E and IL3085-3E) are designed for application flexibility and minimum board area in dense PCAs.

The wide-body version (IL3085E) has redundant ground pins for layout flexibility.

QSOP and narrow-body versions provide separate isolated DE output (ISODE) and Transceiver Device Enable (XDE) input. ISODE follows the

Device Enable input (DE). XDE can be used to enable and disable the transceiver from the bus side, or connected to ISODE to enable and disable

the transceiver from the DE controller-side input. The QSOP and narrow-body versions also provide separate bus-side power supply pins—

VDD2X for the transceiver module and VDD2I for the isolation module. These should be externally connected for normal operation, but can be used

separately for testing or troubleshooting. The QSOP version also has an “ISOR” output that is isolated with respect to the controller-side “R.”

This pin is used for testing and normally not connected, but could be used for a bus-side data output under special circumstances.

The wide-body version has internal connections between the isolated DE output and the Transceiver Device Enable input, and well as between

the two VDD2 bus-side power supply pins. The two internally-connected GND pins for each supply side provide layout flexibility. The ISODE

output can be used in PROFIBUS applications where the state of the isolated drive enable node needs to be monitored, or for testing or

troubleshooting.

Power Supply Decoupling

VDD1 and VDD2 should be bypassed with 0.1 µF typical (0.047 µF minimum) capacitors as close as possible to the VDD pins.

Maintaining Creepage

Creepage distances are often critical in isolated circuits. In addition to meeting JEDEC standards, NVE isolator packages have unique creepage

specifications. Standard pad libraries often extend under the package, compromising creepage and clearance. Similarly, ground planes, if used,

should be spaced to avoid compromising clearance. Package drawings and recommended pad layouts are included in this datasheet.

DC Correctness

The IL3085 incorporates a patented refresh circuit to maintain the correct output state with respect to data input. At power up, the bus outputs

will follow the Function Table shown on Page 1. The DE input should be held low during power-up to eliminate false drive data pulses from the

bus. An external power supply monitor to minimize glitches caused by slow power-up and power-down transients is not required.

Electromagnetic Compatibility

The IL3085 is fully compliant with IEC 61000-6-1 and IEC 61000-6-2 standards for immunity, and IEC 61000-6-3, IEC 61000-6-4,

CISPR, and FCC Class A standards for emissions.

The IsoLoop Isolator’s Wheatstone bridge configuration and differential magnetic field signaling ensure excellent EM immunity.

Immunity to external magnetic fields is even higher if the field direction is “end-to-end” (rather than to “pin-to-pin”) as shown at

right.