MAX14850_V01 [MAXIM]
Six-Channel Digital Isolator;
| 型号： | MAX14850_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Six-Channel Digital Isolator |
| 文件： | 总17页 (文件大小：1005K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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MAX14850
Six-Channel Digital Isolator
General Description
Benefits and Features
● Protection from High-Voltage Environments
The MAX14850 is a six-channel digital isolator utilizing
Maxim’s proprietary process technology, whose mono-
lithic design provides a compact and low-cost transfer
of digital signals between circuits with different power
domains. The technology enables low power consump-
tion and stable high-temperature performance.
• 600V Isolation for 60 Seconds
RMS
• Short-Circuit Protection on Unidirectional Outputs
• 200V Working Isolation Voltage for 50 Years
RMS
● Complete Digital Isolation Solution
• Four Unidirectional Signal Paths: 2-In/2-Out
• Two Bidirectional Open-Drain Signal Paths
• 50Mbps (max) Unidirectional Data Rate
• 2Mbps (max) Bidirectional Data Rate
The four unidirectional channels are each capable of DC
to 50Mbps, with two of the four channels passing data
across the isolation barrier in each direction. The two
bidirectional channels are open-drain; each capable of
data rates from DC to 2Mbps.
● Compatible with Many Interface Standards
2
• I C
Independent 3.0V to 5.5V supplies on each side of the
isolator also make it suitable for use as a level translator.
The MAX14850 can be used for isolating SPI buses, I C
• SPI
• RS-232, RS-422/RS-485
• SMBus, PMBus Interfaces
2
buses, RS-232, RS-485/RS-422 buses, and general-pur-
pose isolation. When used as a bus isolator, extra chan-
nels are available for power monitoring and reset signals.
Ordering Information appears at end of data sheet.
Typical Operating Circuits
The MAX14850 is available in a narrow body,16-pin SOIC
(10mm x 4mm) package (for which an evaluation kit is
available) and 16-pin QSOP (3.9mm x 4.94mm) package.
The packages are specified over the -40°C to +125°C
temperature range.
0.1µF
0.1µF
3.3V
5V
V
V
CCB
CCA
For improved performance, refer to the MAX14851.
The MAX14851 has the same functionality and pin con-
figurations, and can be used as a footprint and functional
replacement for the MAX14850.
MAX14850
R
R
PUA
R
PUB
R
PUB
PUA
GPIO1
GPIO2
SCLK
MOSI
I/OA1
I/OA2
INA1
I/OB1
I/OB2
OUTB1
OUTB2
INB1
RST
Applications
CS
● Industrial Control Systems
SCLK ADC
MOSI
µC
2
● I C, SPI, SMBus, PMBus™ Interfaces
INA2
● Isolated RS-232, RS-485/RS-422
● Telecommunication Systems
● Battery Management
MISO
OUTA1
OUTA2
MISO
V
MONITOR
CCB
GPIO3
INB2
● Medical Systems
GNDA GNDB
600V
RMS
ISOLATION
PMBus is a trademark of SMIF, Inc.
19-6161; Rev 3; 9/19
MAX14850
Six-Channel Digital Isolator
Absolute Maximum Ratings
V
to GNDA........................................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C)
CCA
A
V
to GNDB........................................................-0.3V to +6V
SOIC (derate 13.3mW/°C above +70°C)...................1067mW
CCB
OUTA1, OUTA2 to GNDA.......................-0.3V to (V
OUTB1, OUTB2 to GNDB......................-0.3V to (V
INA1, INA2, I/OA1, I/OA2 to GNDA ........................-0.3V to +6V
INB1, INB2, I/OB1, I/OB2 to GNDB ........................-0.3V to +6V
Short-Circuit Duration (OUTA_ to GNDA or
+ 0.3V)
+ 0.3V)
QSOP (derate 9.6mW/°C above +70°C)..................771.5mW
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow).......................................+260°C
CCA
CCB
V
, OUTB_ to GNDB or V
) ........................Continuous
CCA
CCB
Continuous Current (I/OA_, I/OB_) Pin............................±50mA
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
16 SOIC
Package Code
S16+3
Outline Number
21-0041
90-0097
Land Pattern Number
THERMAL RESISTANCE, MULTILAYER BOARD
Junction to Ambient (θ
)
75°C/W
24°C/W
JA
Junction to Case (θ
)
JC
16 QSOP
Package Code
Outline Number
E16+1
21-0055
90-0167
Land Pattern Number
THERMAL RESISTANCE, MULTILAYER BOARD
Junction to Ambient (θ
)
103.7°C/W
37°C/W
JA
Junction to Case (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Maxim Integrated
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MAX14850
Six-Channel Digital Isolator
Electrical Characteristics
(V
- V
= 3.0V to 5.5V, V
- V
= 3.0V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at
CCA
CCA
GNDA
CCB
GNDB A
V
- V
= 3.3V, V
- V
= 3.3V, and T = +25°C.) (Note 1)
GNDA
CCB
GNDB A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNIT
DC CHARACTERISTICS
V
V
Relative to GNDA
Relative to GNDB
3.0
3.0
5.5
5.5
CCA
Supply Voltage
V
CCB
Unidirectional inputs at
DC or 2Mbps;
bidirectional inputs at DC
or switching at 2Mbps,
no load
V
V
= 5V,
= 5V
CCA
CCB
7.2
6.2
11
V
V
= 3.3V,
= 3.3V
CCA
CCB
9.5
T
=
V
= 5V,
V
5V
A
CCA
15
17
10
11
2
22
24
16
18
I
I
,
CCA
+25°C
Supply Current
mA
CCB
=
CCB
T =
A
+125°C
All inputs switching at
max data rate. No load.
(Note 2)
T
=
V
A
CCA
+25°C
= 3.3V,
V
3.3V
=
CCB
T =
A
+125°C
Undervoltage Lockout
Threshold
V
V
V
- V
- V
, V
- V
- V
(Note 3)
(Note 3)
V
V
UVLO
CCA
GNDA CCB
GNDB
Undervoltage Lockout
Hysteresis
V
, V
GNDA CCB
0.1
UVLOHYS
CCA
GNDB
ISOLATION CHARACTERISTICS
Isolation Voltage
V
t = 60s (Note 4)
- V continuous (Note 2), 50-year life
GNDA
600
V
V
ISO
RMS
Working Isolation
Voltage
V
GNDB
V
200
0.7
IOWM
RMS
kV
expectancy (Figure 4)
ESD Protection
All pins
±2.5
LOGIC INPUTS AND OUTPUTS
Input Threshold Voltage
V
I/OA1, I/OA2, relative to GNDA
INA1, INA2, relative to GNDA
INB1, INB2, relative to GNDB
I/OA1, I/OA2, relative to GNDA
I/OB1, I/OB2, relative to GNDB
INA1, INA2, relative to GNDA
INB1, INB2, relative to GNDB
I/OA1, I/OA2, relative to GNDA
I/OB1, I/OB2, relative to GNDB
0.5
V
V
IT
0.7 x V
0.7 x V
0.7
CCA
CCB
Input Logic-High Voltage
Input Logic-Low Voltage
V
IH
0.7 x V
CCB
0.8
0.8
0.5
V
V
IL
0.3 x V
CCB
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MAX14850
Six-Channel Digital Isolator
Electrical Characteristics (continued)
(V
V
- V
= 3.0V to 5.5V, V
- V
= 3.0V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at
CCA
CCA
GNDA
CCB
GNDB A
- V
= 3.3V, V
- V
= 3.3V, and T = +25°C.) (Note 1)
GNDA
CCB
GNDB A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
- 0.4
MAX
UNIT
OUTA1, OUTA2, relative to GNDA,
source current = 4mA
V
CCA
CCB
Output Logic-High
Voltage
V
V
OH
OUTB1, OUTB2, relative to GNDB,
source current = 4mA
V
- 0.4
OUTA1, OUTA2, relative to GNDA,
sink current = 4mA
0.8
0.8
OUTB1, OUTB2, relative to GNDB,
sink current = 4mA
Output Logic-Low
Voltage
I/OA1, I/OA2, relative to GNDA,
sink current = 10mA
V
0.6
0.6
0.9
V
OL
I/OA1, I/OA2, relative to GNDA,
sink current = 0.5mA
0.85
0.4
I/OB1, I/OB2, relative to GNDB,
sink current = 30mA
Input/Output Logic-Low
Threshold Difference
∆V
I/OA1, I/OA2 (Note 5)
50
mV
pF
TOL
Input Capacitance
C
INA1, INA2, INB1, INB2, f = 1MHz
2
IN
DYNAMIC SWITCHING CHARACTERISTICS
Common-Mode
Transient Immunity
CMTI
V
= V _ or V
_ (Notes 2, 6)
1.5
kV/µs
Mbps
ns
IN
CC GND
INA1 to OUTB1, INA2 to OUTB2, INB1 to
OUTA1, INB2 to OUTA2
50
2
Maximum Data Rate
(Note 2)
DR
MAX
I/OA1 to I/OB1, I/OA2 to I/OB2, I/OB1 to I/OA1,
I/OB2 to I/OA2
INA1 to OUTB1, INA2 to OUTB2, INB1 to
OUTA1, INB2 to OUTA2 (Note 2)
Minimum Pulse Width
PW
20
MIN
V
3.3V
= V
=
INA1 to OUTB1, INA2 to
OUTB2, INB1 to OUTA1,
INB2 to OUTA2,
CCA
CCB
20
18
30
26
R = 1MΩ, C = 15pF,
L
L
V
V
= V
= V
= 5V
=
CCA
CCB
Figure 1
I/OA1 to I/OB1, I/OA2 to
CCA
CCB
30
30
60
60
100
100
100
100
Propagation Delay
(Note 2)
t
DPLH
3.3V
I/OB2, R = 1.6kΩ,
ns
1
t
DPHL
R = 180Ω, C = CL2 =
2
L1
V
= V
= V
= 5V
=
CCA
CCA
CCB
15pF, Figure 2
V
I/OB1 to I/OA1, I/OB2 to
CCB
3.3V
I/OA2, R = 1kΩ,
1
R = 120Ω, C = C =
2
L1
L2
V
= V
= 5V
CCA
CCB
15pF, Figure 2
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MAX14850
Six-Channel Digital Isolator
Electrical Characteristics (continued)
(V
V
- V
= 3.0V to 5.5V, V
- V
= 3.0V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at
CCA
CCA
GNDA
CCB
GNDB A
- V
= 3.3V, V
- V
= 3.3V, and T = +25°C.) (Note 1)
GNDA
CCB
GNDB A
PARAMETER
SYMBOL
CONDITIONS
INA1 TO OUTB1, INA2
MIN
TYP
MAX
UNIT
V
= V
=
CCA
CCB
7
TO OUTB2, INB1 TO
3.3V
OUTA1, INB2 TO OUTA2,
R = 1MΩ,
C = 15pF, Figure 1
L
L
V
V
= V
= V
= 5V
=
7
CCA
CCB
Pulse-Width Distortion
|t – t
I/OA1 to I/OB1, I/OA2 to
CCA
CCB
12
12
60
50
3.3V
|
DPHL
PWD
ns
I/OB2, R = 1.6kΩ,
DPLH
1
(Notes 2, 7)
R = 180Ω, C = CL2 =
2
L1
V
= V
= V
= 5V
=
CCA
CCA
CCB
15pF, Figure 2
V
I/OB1 to I/OA1, I/OB2 to
CCB
3.3V
I/OA2, R = 1kΩ,
1
R = 120Ω, C = C =
2
L1
L2
V
V
= V
= 5V
=
CCA
CCB
15pF, Figure 2
= V
CCA
CCB
3
3
OUTB1 to OUTB2 output
skew, Figure 1
3.3V
V
V
= V
= 5V
=
CCA
CCA
CCB
= V
CCB
3
OUTA1 to OUTA2 output
skew, Figure 1
3.3V
V
= V
= V
= 5V
=
3
Channel-to-Channel
Skew (Notes 2, 7)
CCA
CCB
t
ns
DSKEWCC
V
CCA
CCB
6
I/OB1 to I/OB2 output
skew, Figure 2
3.3V
V
V
= V
= V
= 5V
=
5
CCA
CCA
CCB
CCB
20
20
8
I/OA1 to I/OA2 output
skew, Figure 2
3.3V
V
= V
= 5V
CCA
CCB
Part-to-Part Skew
(Notes 2, 7)
t
∆t
, ∆t
DPHL
ns
ns
DSKEWPP
DPLH
OUTA1, OUTA2, OUTB1, OUTB2, 10% to 90%,
Figure 1
Rise Time (Note 2)
t
5
5
R
OUTA1, OUTA2, OUTB1, OUTB2, 90% to 10%,
Figure 1
V
3.3V
= V
=
I/OA1, I/OA2, 90% to
10%, R = 1.6kΩ,
CCA
CCB
30
40
3
60
80
6
1
R = 180Ω, C = C
=
=
2
L1
L2
Fall Time (Note 2)
t
V
V
= V
= V
= 5V
=
ns
F
CCA
CCB
15pF, Figure 2
I/OB1, I/OB2, 90% to
10%, R = 1kΩ,
CCA
CCB
3.3V
1
R = 120Ω, C = C
2
L1
L2
V
= V
= 5V
3
5
CCA
CCB
15pF, Figure 2
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MAX14850
Six-Channel Digital Isolator
Insulation and Safety Characteristics
PARAMETER
SYMBOL
CONDITIONS
VALUE
UNIT
IEC INSULATION AND SAFETY RELATED FOR SPECIFICATIONS FOR SOIC-16
SOIC-16
QSOP-16
SOIC-16
QSOP-16
4.2
3.81
4.2
mm
mm
mm
mm
mm
External Tracking (Creepage)
CPG
CLR
IEC 60664-1
IEC 60664-1
External Air Gap (Clearance)
Minimum Internal Gap
3.81
0.0026
Insulation Thickness
Tracking Resistance (Comparative
Tracking Index)
CTI
IEC 112 / VDE 030 Part 1
175
1
V
Insulation Resistance Across
Barrier
R
GΩ
pF
ISO
Capacitance Across Isolation
Barrier
C
f = 1MHz
12
IO
VDE IEC INSULATION CHARACTERISTICS
IEC 60747-17, section 5.3.1.6 and 5.4.6 for basic
insulation
Surge Isolation Voltage
V
V
1
kVpeak
IOSM
Repetitive Peak Isolation Voltage
Rated Transient Isolation Voltage
Safety Limiting Temperature
IEC 60747-17, section 5.3.1.3
IEC 60747-17, section 5.3.1.4
IEC 60747-17, section 7.2.1
282
850
150
Vpeak
Vpeak
°C
IORM
V
IOTM
T
S
Safety Limiting Side A Power
Dissipation
P
IEC 60747-17, section 7.2.1
IEC 60747-17, section 7.2.1
0.75
0.75
W
W
SA
Safety Limiting Side B Power
Dissipation
P
SB
Apparent Charge Method
Overvoltage Category
Overvoltage Category
Climatic Category
q
IEC 60747-17, section 7.4, method a & b
5
pC
—
—
—
—
pd
IEC 60664-1, single or three phase 50V DC or AC
IEC 60664-1, single or three phase 100V DC or AC
I,II
I
40/125/21
2
Pollution Degree
DIN VDE 0110, Table 1
Note 1: All units are production tested at T = +25°C. Specifications over temperature are guaranteed by design. All voltages of side
A
A are referenced to GNDA. All voltages of side B are referenced to GNDB, unless otherwise noted.
Note 2: Guaranteed by design. Not production tested.
Note 3: The undervoltage lockout threshold and hysteresis guarantee that the outputs are in a known state during a slump in the
supplies. See the Detailed Description section for more information.
Note 4: The isolation is guaranteed for t = 60s, and tested at 120% of the guaranteed value for 1s.
Note 5: ΔV
= V – V . This is the minimum difference between the output logic-low voltage and the input logic threshold for
TOL
OL IL
the same I/O pin. This ensures that the I/O channels are not latched low when any of the I/O inputs are driven low (see the
Bidirectional Channels section).
Note 6: The common-mode transient immunity guarantees that the device will hold its outputs stable when the isolation voltage
changes at the specified rate.
Note 7: Pulse-width distortion is defined as the difference in propagation delay between low-to-high and high-to-low transitions on
the same channel. Channel-to-channel skew is defined as the difference in propagation delay between different channels on
the same device. Part-to-part skew is defined as the difference in propagation delays (for unidirectional channels) between
different devices, when both devices operate with the same supply voltage, at the same temperature and have identical
package and test circuits.
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MAX14850
Six-Channel Digital Isolator
Test Circuits/Timing Diagrams
V
CCA
INA1, INA2
50%
50%
GNDA
t
DPLH
V
CCA
0.1µF
0.1µF
V
CCB
V
CCA
V
CCB
t
DPHL
V
CCB
MAX14850
OUTB1
50%
50%
50Ω
INA_
OUTB_
GNDB
GNDB
TEST
SOURCE
R
GNDA
C
L
L
t
DSKEWCC
V
CCB
90%
50%
OUTB2
(A)
10%
GNDB
t
t
F
R
(B)
Figure 1. Test Circuit (A) and Timing Diagram (B) for Unidirectional Channels
V
CCA
0.1µF
0.1µF
V
CCB
V
CCA
V
CCB
R
1
R
2
MAX14850
I/OA_
I/OB_
C
L1
GNDA
GNDB
C
L2
TEST
SOURCE
(A)
V
CCA
V
CCB
I/OA1, I/OA2
I/OB1, I/OB2
50%
50%
50%
50%
GNDA
GNDB
t
t
DPLH
DPLH
t
t
DPHL
DPHL
V
V
CCA
CCB
50%
50%
90%
50%
50%
90%
I/OB1
I/OA1
V
V
(min)
V
(min)
OL
OL
t
t
DSKEWCC
50%
DSKEWCC
50%
V
CCB
V
CCA
I/OB2
I/OA2
10%
10%
(min)
V
(min)
OL
OL
t
F
t
F
(B)
(C)
Figure 2. Test Circuit (A) and Timing Diagrams (B) and (C) for Bidirectional Channels
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MAX14850
Six-Channel Digital Isolator
Typical Operating Characteristics
(V
– V
= 3.3V, V
– V
= 3.3V, all inputs idle, T = +25°C, unless otherwise noted.)
CCA
GNDA
CCB
GNDB A
I
vs. DATA RATE
I
vs. DATA RATE
I vs. DATA RATE
CCA
CCA
CCB
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
INA1/INA2
SWITCHING
INB1/INB2
SWITCHING
I/OA1/I/OA2
SWITCHING
I/OB1/I/OB2
SWITCHING
INB1/INB2
SWITCHING
INA1/INA2
SWITCHING
PULLUP = 2k
0.001
0.01
0.1
1
10
100
0.001
0.01
0.1
1
10
100
5.5
75
0.001
0.01
0.1
1
10
DATA RATE (Mbps)
DATA RATE (Mbps)
DATA RATE (Mbps)
I
vs. V
I
vs. V
CCB CCB
I
vs. DATA RATE
CCA
CCA
CCB
10
9
8
7
6
5
4
3
2
1
0
10
9
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
T
= +125°C
A
T
= -40°C
T
= +125°C
A
A
I/OB1/I/OB2
SWITCHING
I/OA1/I/OA2
SWITCHING
T
= +25°C
A
T
= -40°C
T
= -40°C
A
A
PULLUP = 2k
1 10
3.0
3.5
4.0
V
4.5
(V)
5.0
3.0
3.5
4.0
4.5
(V)
5.0
5.5
0.001
0.01
0.1
V
DATA RATE (Mbps)
CCA
CCB
OUTA_ V vs. SOURCE CURRENT
OUTA_ V vs. SINK CURRENT
OL
I
vs.TEMPERATURE
OH
CC
5
4
3
2
1
0
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
V
= 5V
CCA
I
CCA
V
= 3.3V
CCA
I
CCB
V
= 3.3V
CCA
V
= 5V
60
CCA
0
15
30
I
45
(mA)
60
0
15
30
45
(mA)
75
-40 -25 -10
5
20 35 50 65 80 95 110 125
I
TEMPERATURE (°C)
SOURCE
SINK
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MAX14850
Six-Channel Digital Isolator
Typical Operating Characteristics (continued)
(V
– V
= 3.3V, V
– V
= 3.3V, all inputs idle, T = +25°C, unless otherwise noted.)
CCA
GNDA
CCB
GNDB
A
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
OUTB_ V vs. SOURCE CURRENT
OUTB_ V vs. SINK CURRENT
OL
OH
5
4
3
2
1
0
5
4
3
2
1
0
16
14
12
10
8
V
= 5V
CCB
V
- V = 0V
GNDB GNDA
V
- V
= -100V
GNDB GNDA
V
= 3.3V
CCB
V
- V
= +100V
GNDB GNDA
V
= 3.3V
CCB
6
4
V
CCB
= 5V
60
V
= V
DDA
DDB
INA_ TO OUTB_
LOW TO HIGH TRANSITION
2
0
0
15
30
45
(mA)
60
75
0
15
30
45
(mA)
75
3.0
3.5
4.0
V
4.5
(V)
5.0
5.5
I
I
SINK
SOURCE
DDA
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
PROPAGATION DELAY
vs.CAPACITIVE LOAD
PROPAGATION DELAY
vs. TEMPERATURE
12
10
8
18
16
14
12
10
8
18
16
14
12
10
8
V
- V
= 0V
- V
GNDB GNDA
LOW TO HIGH
LOW TO HIGH
V
= -100V
GNDB GNDA
HIGH TO LOW
HIGH TO LOW
V
- V = +100V
GNDB GNDA
6
4
6
6
4
4
V
= V
DDB
DDA
INA_ TO OUTB_
HIGH TO LOW TRANSITION
2
2
2
INA_ TO OUTB_
80 100
INA_ TO OUTB_
0
0
0
3.0
3.5
4.0
V
4.5
(V)
5.0
5.5
0
20
40
C (pF)
60
-40 -25 -10
5
20 35 50 65 80 95 110 125
T (°C)
A
DDA
L
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
PROPAGATION DELAY
vs. CAPACITIVE LOAD
16
14
12
10
8
12
10
8
20
18
16
14
12
10
8
V
- V = 0V
GNDB GNDA
V
- V = -100V
GNDB GNDA
V
- V = 0V
GNDB GNDA
LOW TO HIGH
V - V = +100V
GNDB GNDA
V
- V = -100V
GNDB GNDA
HIGH TO LOW
6
V
- V = +100V
GNDB GNDA
6
4
6
4
4
V
= V
V
= V
DDB
DDA
DDB
DDA
INB_ TO OUTA_
HIGH TO LOW TRANSITION
2
INB_ TO OUTA_
2
2
LOW TO HIGH TRANSITION
INB_ TO OUTA_
60 80 100
0
0
0
3.0
3.5
4.0
V
4.5
(V)
5.0
5.5
3.0
3.5
4.0
V
4.5
(V)
5.0
5.5
0
20
40
C (pF)
DDA
DDA
L
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MAX14850
Six-Channel Digital Isolator
Typical Operating Characteristics (continued)
(V
– V
= 3.3V, V
– V
= 3.3V, all inputs idle, T = +25°C, unless otherwise noted.)
CCA
GNDA
CCB
GNDB
A
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
PROPAGATION DELAY
vs. TEMPERATURE
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
18
16
14
12
10
8
35
30
25
20
15
10
5
20
15
10
5
V
- V = +100V
GNDB GNDA
V
- V
GNDB GNDA
= +100V
= -100V
LOW TO HIGH
V
- V
GNDB GNDA
V
- V = -100V
GNDB GNDA
V
- V
= 0V
GNDB GNDA
HIGH TO LOW
V
- V = 0V
GNDB GNDA
6
V
= V
DDB
DDA
I/OA_ TO I/OB_
4
V
= V
DDA
DDB
I/OA_ TO I/OB_
HIGH TO LOW TRANSITION
LOW TO HIGH TRANSITION
2
PULLUP = 1kΩ
INB_ TO OUTA_
0
0
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
3.0
3.5
4.0
V
4.5
(V)
5.0
5.5
3.0
3.5
4.0
V
4.5
(V)
5.0
5.5
T
A
(°C)
DDA
DDA
PROPAGATION DELAY
vs.TEMPERATURE
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
50
40
30
20
10
0
30
25
20
15
10
5
V
- V = +100V
GNDB GNDA
LOW TO HIGH
V
- V = -100V
GNDB GNDA
V
- V = 0V
GNDB GNDA
HIGH TO LOW
V
= V
DDB
DDA
I/OB_ TO I/OA_
LOW TO HIGH TRANSITION
I/OA_ TO I/OB_
PULLUP = 1kΩ
PULLUP = 1kΩ
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
(°C)
3.0
3.5
4.0
4.5
(V)
5.0
5.5
T
A
V
DDA
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
PROPAGATION DELAY
vs. TEMPERATURE
60
50
40
30
20
10
0
60
50
40
30
20
10
0
V
- V = +100V
GNDB GNDA
V
- V = -100V
GNDB GNDA
HIGH TO LOW
LOW TO HIGH
V
- V = 0V
GNDB GNDA
V
= V
DDB
DDA
I/OB_ TO I/OA_
HIGH TO LOW TRANSITION
I/OB_ TO I/OA_
PULLUP = 1kΩ
3.0
3.5
4.0
V
4.5
(V)
5.0
5.5
-40 -25 -10
5
20 35 50 65 80 95 110 125
(°C)
T
A
DDA
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MAX14850
Six-Channel Digital Isolator
Pin Configuration
TOP VIEW
+
V
1
2
3
4
5
6
7
8
16
15 OUTB1
OUTB2
V
CCA
CCB
INA1
INA2
14
MAX14850
OUTA1
OUTA2
I/OA1
13 INB1
12 INB2
11 I/OB1
10 I/OB2
I/OA2
GNDA
9
GNDB
SOIC/QSOP
Pin Description
PIN
NAME
FUNCTION
REFERENCE
Supply Voltage of Logic Side A. Bypass V
capacitor to GNDA.
with a 0.1µF ceramic
CCA
1
V
GNDA
CCA
2
3
4
5
INA1
INA2
Logic Input 1 on Side A. INA1 is translated to OUTB1.
Logic Input 2 on Side A. INA2 is translated to OUTB2.
Logic Output 1 on Side A. OUTA1 is a push-pull output.
Logic Output 2 on Side A. OUTA2 is a push-pull output.
GNDA
GNDA
GNDA
GNDA
OUTA1
OUTA2
Bidirectional Input/Output 1 on Side A. I/OA1 is translated to/from I/OB1
and is a open-drain output.
6
7
I/OA1
I/OA2
GNDA
GNDA
Bidirectional Input/Output 2 on Side A. I/OA2 is translated to/from I/OB2
and is a open-drain output.
8
9
GNDA
GNDB
Ground Reference for Side A
Ground Reference for Side B
—
—
Bidirectional Input/Output 2 on Side B. I/OB2 is translated to/from I/OA2
and is a open-drain output.
10
I/OB2
GNDB
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MAX14850
Six-Channel Digital Isolator
Pin Description (continued)
PIN
NAME
FUNCTION
REFERENCE
Bidirectional Input/Output 1 on Side B. I/OB1 is translated to/from I/OA1
and is a open-drain output.
11
I/OB1
GNDB
12
13
14
15
INB2
INB1
Logic Input 2 on Side B. INB2 is translated to OUTA2.
Logic Input 1 on Side B. INB1 is translated to OUTA1.
Logic Output 2 on Side B. OUTB2 is a push-pull output.
Logic Output 1 on Side B. OUTB1 is a push-pull output.
GNDB
GNDB
GNDB
GNDB
OUTB2
OUTB1
Supply Voltage of Logic Side B. Bypass V
capacitor to GNDB.
with a 0.1µF ceramic
CCB
16
V
GNDB
CCB
Functional Diagram
Detailed Description
The MAX14850 is a six-channel digital isolator. The
device is rated for 600V isolation voltage for 60
RMS
V
CCA
V
CCB
seconds. This digital isolator offers a low-power, low-cost,
high electromagnetic interference (EMI) immunity, and sta-
ble temperature performance through Maxim’s proprietary
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 unidirectional channels support
data rates of up to 50Mbps. The other two channels are
bidirectional with data rates up to 2Mbps.
MAX14850
INA1
INA2
OUTB1
OUTB2
INB1
OUTA1
OUTA2
600V
RMS
INB2
DIGITAL
ISOLATOR
2
®
Isolation of I C, SPI/MICROWIRE , and other serial
busses can be achieved with the MAX14850. The
device features two supply inputs, V
and V
, that
I/OA1
I/OA2
I/OB1
I/OB2
CCA
CCB
independently set the logic levels on either side of the
device. V and V are referenced to GNDA and
CCA
CCB
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.
GNDA
GNDB
Up to 200V
of continuous isolation is supported as
RMS
well as transient differences of up to 850V.
MICROWIRE is a registered trademark of Texas Instruments.
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MAX14850
Six-Channel Digital Isolator
Due to their nature, the MAX14850 A-side output buffers
cannot be connected together or to a device with similar
buffers or rise time accelerators. However, the MAX14850
B-side output buffers can be connected together or to any
other bidirectional buffer or level translator.
Level Shifting
The MAX14850 tolerates a ground difference of 600V
.
RMS
Therefore, V
can be 850V
higher or lower than
GNDA
DC
V
GNDB
. In addition, the device translates logic levels
when (V
–V
) is higher or lower voltage than
CCA GNDA
(V
–V
), as long as each is within the valid 3.0V
The I/OA1, I/OA2, I/OB1, and I/OB2 pins have open-drain
outputs, requiring pullup resistors to their respective
supplies 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).
CCB GNDB
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.
Startup and Undervoltage Lockout
The V
and V
supplies are both internally
CCA
CCB
monitored 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 external
pullup resistor on the open-drain output. The unidirectional
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 resis-
tors. The outputs are able to drive both TTL and CMOS
logic inputs.
outputs are pulled high internally to the voltage of the V
CCA
or V
supply during undervoltage conditions.
Bidirectional Channels
CCB
When an undervoltage condition is detected on either
supply, all unidirectional outputs are pulled to the supplies
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.
I/OA1 and I/OA2 outputs comprise special buffers that
regulate the logic-low voltage at approximately 0.7V. The
(
Table 1). The bidirectional outputs are high impedance
and pulled to the supplies by the external pullup resistors.
Figure 3 shows the behavior of the outputs during power-
up and power-down.
Safety Regulatory Approvals
The MAX14850 is safety certified by UL, CSA, and
IEC 60747-5-2. Per UL1577, the MAX14850 is 100%
input logic-low threshold (V ) of I/OA1 and I/OA2 is at
IT
least 50mV lower than the output logic-low voltage 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.
I/OB1 and I/OB2 are conventional outputs that do not
regulate the logic-low output voltage.
tested at an equivalent V
(see Table 2).
of 720V
for one second
ISO
RMS
Table 1. Output Behavior During Undervoltage Conditions
V
V
V
V
V
OUTB_
IN
CCA
CCB
OUTA_
1
Powered
Powered
Powered
Powered
1
1
0
X
X
0
0
1
Undervoltage
Powered
Powered
Follows V
1
CCA
Undervoltage
Follows V
CCB
Table 2. Safety Regulatory Approvals
SAFETY AGENCY
STANDARD
ISOLATION NUMBER
isolation voltage for 60 seconds
FILE NUMBER
E351759
UL
UL1577 Recognized
600V
RMS
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MAX14850
Six-Channel Digital Isolator
LIFE EXPECTANCY
vs. WORKING ISOLATION VOLTAGE
1000
V
V
CCA
CCB
100
50
V
IOWM
= 200V
RMS
V
V
OUTA_
10
OUTB_
V
V
I/OA_
1
I/OB_
0.1
0.001
0
100 200 300 400 500 600 700 800
400µs/div
WORKING ISOLATION VOLTAGE (V ) - V
IOWM RMS
Figure 3. Undervoltage Lockout Behavior
Figure 4. Life Expectancy vs. Working Isolation Voltage
Power Supply Sequencing
Applications Information
The MAX14850 does not require special power-supply
sequencing. The logic levels are set independently on
Affect of Continuous Isolation
on Lifetime
either side by V
and V
. Each supply can be pres-
CCA
CCB
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.
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
and V
with 0.1µF ceramic capacitors to
CCA
CCB
GNDA and GNDB, respectively. Place the bypass capaci-
tors as close to the power-supply input pins as possible.
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MAX14850
Six-Channel Digital Isolator
Typical Operating Circuits (continued)
0.1µF
0.1µF
3.3V
5V
V
CCA
V
CCB
R
R
PUA
R
PUB
R
PUB
PUA
MAX14850
SDA
SCL
I/OA1
I/OA2
INA1
I/OB1
I/OB2
OUTB1
OUTB2
INB1
SDA
SCL
DAC
RESET
µC
GPIO1
GPIO2
GPIO3
RST
LDAC
LOAD DAC
INA2
V
MONITOR
CCB
OUTA1
OUTA2
SPARE
INB2
GNDA
GNDB
600V
RMS
ISOLATION
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MAX14850
Six-Channel Digital Isolator
Typical Operating Circuits (continued)
0.1µF
0.1µF
3.3V
5V
V
V
CCB
CCA
R
PUB
MAX14850
R
PUA
MAX13085E
RE
RO
I/OB1
INB1
GPIO1
RX
I/OA1
A
OUTA1
I/OA2
INA1
µC
I/OB2
OUTB1
OUTB2
INB2
B
DE
DI
RTS
TX
INA2
V
MONITOR
CCB
GPIO3
OUTA2
GNDA
GNDB
600V
RMS
ISOLATION
Ordering Information
Chip Information
PROCESS: BiCMOS
PART
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 SOIC
MAX14850ASE+
MAX14850ASE+T
MAX14850AEE+
MAX14850AEE+T
16 SOIC
16 QSOP
16 QSOP
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and Reel
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MAX14850
Six-Channel Digital Isolator
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
3/12
Initial release
—
Updated General Description, Benefits and Features, Bidirectional Channels section,
Table 2, and Typical Operating Circuits
1, 13,
15, 16
1
2
5/14
Added QSOP package and related information
Additional package and ordering information for QSOP
1, 2, 6,
11, 13, 16
11/14
Updated General Description, Absolute Maximum Ratings, Electrical Characteristics,
Pin Description table, Level Shifting, Bidirectional Channels, Startup and
Undervoltage Lockout, Safety Regulatory Approvals, and Table 2.
3
9/19
1–3, 11–13
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2019 Maxim Integrated Products, Inc.
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