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MAX14850
Six-Channel Digital Isolator
Ground Isolation/Level Shifting
The MAX14850 tolerates a ground difference of 600V RMS .
Therefore, V GNDA can be 850VDC higher or lower than
V GNDB . In addition, the device translates logic levels
when (V CCA –V GNDA ) is higher or lower voltage than
(V CCB –V GNDB ), as long as each is within the valid 3.0V
to 5.5V range.
Unidirectional and Bidirectional Channels
The MAX14850 operates both as a unidirectional device
and bidirectional device simultaneously. Each unidirec-
tional channel can only be used in the direction shown in
the functional diagram. The bidirectional channels func-
tion without requiring a direction control input.
Unidirectional Channels
The device features four unidirectional channels that
operate independently with guaranteed data rates from
DC to 50Mbps. The output driver of each unidirectional
channel is push-pull, eliminating the need for pullup
resistors. The outputs are able to drive both TTL and
CMOS logic inputs.
Bidirectional Channels
The device features two bidirectional channels that have
open-drain outputs. The bidirectional channels do not
require a direction control input. A logic-low on one side
causes the corresponding pin on the other side to be
pulled low while avoiding data latching within the device.
The input logic-low threshold (V IT ) of I/OA1 and I/OA2 are
at least 50mV lower than the output logic-low voltages of I/
OA1 and I/OA2. This prevents an output logic-low on side
A from being accepted as an input low and subsequently
transmitted to side B, thus preventing a latching action.
The I/OA1, I/OA2, I/OB1, and I/OB2 pins have open-drain
outputs, requiring pullup resistors to their respective sup-
plies for logic-high outputs. The output low voltages are
guaranteed for sink currents of up to 30mA for side B, and
10mA for side A (see the Electrical Characteristics table).
The bidirectional channels of the device support I 2 C
clock stretching.
Startup and Undervoltage Lockout
The V CCA and V CCB supplies are both internally moni-
tored for undervoltage conditions. Undervoltage events
can occur during power-up, power-down, or during
normal operation due to a slump in the supplies. When an
undervoltage event is detected on either of the supplies, all
outputs on both sides are automatically controlled, regard-
less of the status of the inputs. The bidirectional outputs
become high impedance and are pulled high by the exter-
nal pullup resistor on the open-drain output. The unidirec-
tional outputs are pulled high internally to the voltage of the
V CCA or V CCB supply during undervoltage conditions.
When an undervoltage condition is detected on either
supply, all unidirectional outputs are pulled to the supplies
( Table 1 ). The bidirectional outputs are high impedance
and pulled to the supplies by the external pullup resistors.
Safety Regulatory Approvals
The MAX14850 is safety certified by UL, CSA, and
IEC 60747-5-2. Per UL1577, the MAX14850 is 100%
tested at an equivalent V ISO of 720V RMS for one second
(see Table 2 ).
Figure 3 shows the behavior of the outputs during power-
up and power-down.
Table 1. Output Behavior During Undervoltage Conditions
V IN
1
0
X
X
V CCA
Powered
Powered
Under Voltage
Powered
V CCB
Powered
Powered
Powered
Under Voltage
V OUTA?
1
0
Follows V CCA
1
V OUTB?
1
0
1
Follows V CCB
Table 2. Safety Regulatory Approvals (Pending)
SAFETY AGENCY
UL
VDE
Maxim Integrated
STANDARD
UL1577 Recognized
Approved to 60747-17
ISOLATION NUMBER
600V RMS isolation voltage for 60 seconds
Basic insulation, 600V RMS for 60 seconds
FILE NUMBER
Pending
Pending
13
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