IL610-3E NVE, IL610-3E Datasheet - Page 8

• Manufacturer Part Number: IL610-3E
• Description: ISOLATOR PASSIVE INPUT 8-SOIC
• Manufacturer: NVE
• Series: IsoLoop®r

Specifications of IL610-3E

• Inputs - Side 1/side 2: 1/0
• Number Of Channels: 1
• Isolation Rating: 2500Vrms
• Voltage - Supply: 3 V ~ 5.5 V
• Data Rate: 100Mbps
• Propagation Delay: 12ns
• Output Type: CMOS
• Package / Case: 8-SOIC (3.9mm Width)
• Operating Temperature: -40°C ~ 85°C
• No. Of Channels: 1
• Supply Current: 2mA
• Supply Voltage Range: 3V To 5.5V
• Digital Ic Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Operating: RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 390-1077-5; IL610-3E; Q2450046

Operation
The IL600 series are current mode devices. Changes in current flow into the input coil result in logic state changes at the output.
One of the great advantages of the passive coil input is that both single ended and differential inputs can be handled without the
need for reverse bias protection. The internal GMR sensor switches the output to logic low if current flows from (In-) to (In+).
Only a single resistor is required to limit the input coil to the recommended 5 mA. This allows large input voltages to be used since
there is no semiconductor structure on the input.
The absolute maximum current through the coil of the IL600 series is 25 mA DC. The worst case logic threshold current is 5 mA.
While typical threshold currents are actually less than this, NVE recommends designing a 5 mA logic threshold current in each
application. In all cases, the current must flow from In- to In+ in the coil to switch the output low. This is the case for true or
inverted data, or single ended or differential configurations. Output logic high is the zero input current state.
Figure 1 shows the response of the IL600 series. The GMR bridge structure is designed such that the output of the isolator is logic
high when no field signal is present. The output will switch to the low state with approximately 3.5 mA of coil current, and switch
back to the high state when the input current falls below 1.5 mA. This allows glitch-free interface with low slew rate signals.
To calculate the value of the protection resistor (R1) required, use Ohm’s law as shown in the examples below. It should be noted
that we are concerned only with the magnitude of the voltage across the coil. The absolute values of V
Figure 1. IL600 Series Transfer Function
Figure 2. Series Resistor Calculation
Equivalent Circuit
Example 1. In this case, T
V, and I
(R1+R
Therefore,
R1 = (4440-55) Ω = 4385 Ω
Example 2. At a maximum operating temperature of 85°C,
T
R
R
Therefore, the recommended series resistor is
R1 = (V
R1 = (5-0) - 5 = 935 Ω
Allowance should also be made for the temperature coefficient of the
current limiting resistor to ensure that I
maximum operating temperature.
MAX
COIL
COIL
= 55 Ω. At T
= 85ºC, T
= 55 + (85 - 25) x 0.165 = 55 + 9.9 = 65 Ω
= 55 + (T
8
COIL
0.005
COIL
INH
I
COIL
) = (V
-V
minimum is specified as 5 mA. Total loop resistance is:
INL
MAX
NOM
) – R
INH
I
= 25ºC, V
- T
COIL
MAX
- V
COIL
MIN
INL
= 85ºC
) x TCR
) = 22.2 Ω = 4440 Ω
NOM
0.005
IN
= 25ºC, V
High = 5 V, V
COIL
COIL
IN
IL600 Series
High is 24 V, V
is at least 5 mA at the
INH
IN
Low = 0 V, and nominal
and V
INL
are arbitrary.
IN
Low is 1.8