Datasheet

MAX14850
Six-Channel Digital Isolator
14Maxim Integrated
Applications Information
Affect of Continuous Isolation
on Lifetime
High-voltage conditions cause insulation to degrade
over time. Higher voltages result in faster degradation.
Even the high-quality insulating material used in the
MAX14850 can degrade over long periods of time with a
constant high-voltage across the isolation barrier. Figure 4
shows the life expectancy of the MAX14850 vs. working
isolation voltage.
Power Supply Sequencing
The MAX14850 does not require special power-supply
sequencing. The logic levels are set independently on
either side by V
CCA
and V
CCB
. Each supply can be pres-
ent over the entire specified range regardless of the level
or presence of the other.
Power Supply Decoupling
To reduce ripple and the chance of introducing data errors,
bypass V
CCA
and V
CCB
with 0.1FF ceramic capacitors to
GNDA and GNDB, respectively. Place the bypass capaci-
tors as close to the power-supply input pins as possible.
Figure 4. Life Expectancy vs. Working Isolation Voltage
Figure 3. Undervoltage Lockout Behavior
LIFE EXPECTANCY
vs. WORKING ISOLATION VOLTAGE
WORKING ISOLATION VOLTAGE (V
IOWM
) - V
RMS
WORKING LIFE - YEARS (LOG SCALE)
700600500400300200100
0.1
1
10
100
50
1000
0.001
0 800
V
IOWM
= 200V
RMS
V
CCA
V
CCB
V
OUTA
_
V
OUTB
_
V
I/OA_
V
I/OB_
400µs/div
5V/div