IL3285 IL3222
7
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
Example 1. In this case, Tnom = 25ºC, Vin High is 5 V, Vin
Low is 0 V, and Icoil minimum is specified as 10 mA. Total
loop resistance is
Ω
5
=
)
−
(
=
Ω
=
Ω
=
=
+
4
4
Ω
55
500
R1
Therefore,
500
0.01
5.0
I
Low)
V
-
High
(V
)
R
(R1
coil
in
in
coil
Example 2. At a maximum operating temperature of 85°C,
Tmax = 85ºC, Tnom = 25ºC, Vin High = 5 V, Vin Low = 0 V,
and nominal Rcoil = 55 Ω. At Tmax = 85ºC
()
Ω
=
−
=
=
Ω
=
+
=
×
+
=
×
)
−
(
+
=
435
65
0.01
0
-
5
R
-
I
Low)
V
-
High
(V
R1
is
resistor
series
d
recommende
the
Therefore,
65
9
.
9
55
165
.
0
25
-
85
55
TCR
T
T
55
R
coil
coil
in
in
coil
min
max
coil
Allowance should also be made for the temperature
coefficient of the current limiting resistor to ensure that Icoil
is 10 mA at maximum operating temperature.
Power Supplies
It is recommended that 47 nF ceramic capacitors be used to
decouple the power supplies. The capacitors must be placed
as close as possible to VDD for proper operation.
DC Correctness
The IL3000 Series of isolated transceivers are inherently DC
stable which effectively maintains the correct output state
with respect to data input. At power up, the bus outputs will
follow the Function Table shown on Page 1. It is
recommended that the DE input is always held low during
power up to eliminate false drive data pulses from the bus.
The use of an external power supply monitor to minimize
glitches caused by slow power-up and power-down
transients is not required.
Application Information_______________________
Receiver Features
The receiver in these devices feature a “fail-safe if open”
function that guarantees a high level receiver output if the
receiver inputs are unconnected (floating). IL3285 receiver
outputs have tri-state capability via the active low RE input.
Driver Features
The driver is device delivers at least 1.5 V across a 54
Ω
load and features low propagation delay skew to maximize
bit width and to minimize EMI. The drivers have tri-state
capability via the active high DE input.
Receiver Data Rate, Cables and Terminations
This devices are intended for network lengths up to 4000',
but the maximum system data rate decreases as the
transmission line length increases. Twisted pair cable should
be used in all networks since they tend to pick up noise and
other electromagnetically induced voltages as common
mode signals, which are effectively rejected by the
differential receivers in these ICs.
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