Datasheet

MAX14850
Six-Channel Digital Isolator
12Maxim Integrated
Functional Diagram
Detailed Description
The MAX14850 is a six-channel digital isolator. The
device is rated for 600V
RMS
isolation voltage for 60
seconds. This digital isolator offers a low-power, low-cost,
high electromagnetic interference (EMI) immunity, and
stable temperature performance through Maxim’s propri-
etary process technology. The device uses a monolithic
solution to isolate different ground domains and block
high-voltage/high-current transients from sensitive or
human interface circuitry. Four of the six channels are
unidirectional, two in each direction. All four unidirec-
tional channels support data rates of up to 50Mbps. The
other two channels are bidirectional with data rates up to
2Mbps.
Isolation of I
2
C, SPI/MICROWIRE
®
, and other serial
busses can be achieved with the MAX14850. The
device features two supply inputs, V
CCA
and V
CCB
, that
independently set the logic levels on either side of the
device. V
CCA
and V
CCB
are referenced to GNDA and
GNDB, respectively. The MAX14850 features a refresh
mode to ensure accuracy of data when the inputs are DC.
Digital Isolation
The MAX14850 provides galvanic isolation for digital
signals that are transmitted between two ground domains.
Up to 200V
RMS
of continuous isolation is supported as
well as transient differences of up to 850V.
Pin Description (continued)
MICROWIRE is a registered trademark of National
Semiconductor Corporation.
PIN NAME FUNCTION VOLTAGE RELATIVE TO
11 I/OB1
Bidirectional Input/Output 1 on Side B. I/OB1 is translated to/from I/OA1
and is a open-drain output.
GNDB
12 INB2 Logic Input 2 on Side B. INB2 is translated to OUTA2. GNDB
13 INB1 Logic Input 1 on Side B. INB1 is translated to OUTA1. GNDB
14 OUTB2 Logic Output 2 on Side B. OUTB2 is a push-pull output. GNDB
15 OUTB1 Logic Output 1 on Side B. OUTB1 is a push-pull output. GNDB
16 V
CCB
Supply Voltage of Logic Side B. Bypass V
CCB
with a 0.1FF ceramic
capacitor to GNDB.
GNDB
MAX14850
INA1
V
CCA
V
CCB
GNDA GNDB
600V
RMS
DIGITAL
ISOLATOR
INA2
OUTA1
OUTA2
I/OA1
I/OA2
OUTB1
OUTB2
INB1
INB2
I/OB1
I/OB2