MAX14850
Six-Channel Digital Isolator
Typical Operating Circuits
19-6161; Rev 2; 11/14
Ordering Information appears at end of data sheet.
PMBus is a trademark of SMIF, Inc.
EVALUATION KIT AVAILABLE
General Description
The MAX14850 is a six-channel digital isolator utilizing
Maxim’s proprietary process technology, whose monolithic
design provides a compact and low-cost transfer of digital
signals between circuits with different power domains. The
technology enables low power consumption and stable
high-temperature performance.
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.
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, I2C
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.
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 -40NC to +125NC
automotive temperature range.
Applications
●Industrial Control Systems
●I2C, SPI, SMBus, PMBusK Interfaces
●Isolated RS-232, RS-485/RS-422
●Telecommunication Systems
●Battery Management
●Medical Systems
Benets and Features
●Protection from High-Voltage Environments
• 600VRMS Isolation for 60 Seconds
• Short-Circuit Protection on Unidirectional Outputs
• 200VRMS Working Isolation Voltage for 50 Years
●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
●Compatible with Many Interface Standards
• I2C
• SPI
• RS-232, RS-422/RS-485
• SMBus, PMBus Interfaces
I/OA1 RST
CS
SCLK ADC
MOSI
MISO
GPIO1
I/OA2GPIO2
INA1SCLK
INA2MOSI
OUTA1MISO
OUTA2
I/OB1
I/OB2
OUTB1
OUTB2
INB1
INB2GPIO3
µC
GNDA GNDB
VCCA VCCB
RPUARPUARPUB
RPUB
0.1µF 0.1µF
3.3V 5V
VCCB MONITOR
MAX14850
600VRMS
ISOLATION
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s
website at www.maximintegrated.com.
MAX14850
Six-Channel Digital Isolator
2Maxim Integrated
VCCA to GNDA ........................................................-0.3V to +6V
VCCB to GNDB ........................................................-0.3V to +6V
OUTA1, OUTA2 to GNDA ..................... -0.3V to (VCCA + 0.3V)
OUTB1, OUTB2 to GNDB ..................... -0.3V to (VCCB + 0.3V)
INB1, INB2, I/OA1, I/OA2 to GNDA ........................-0.3V to +6V
INA1, INA2, I/OB1, I/OB2 to GNDB ........................-0.3V to +6V
Short-Circuit Duration (OUTA_ to GNDA or
VCCA, OUTB_ to GNDB or VCCB) .........................Continuous
Continuous Current (I/OA_, I/OB_) Pin ............................ Q50mA
Continuous Power Dissipation (TA = +70NC)
SOIC (derate 13.3mW/NC above +70NC) ..............1067mW
QSOP (derate 9.6mW/NC above +70NC)..............771.5mW
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Absolute Maximum Ratings
Note 1: 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.
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.
SOIC
Junction-to-Ambient Thermal Resistance (BJA) ..........75NC/W
Junction-to-Case Thermal Resistance (BJC) ...............24NC/W
QSOP
Junction-to-Ambient Thermal Resistance (BJA) .....103.7NC/W
Junction-to-Case Thermal Resistance (BJC) ...............37NC/W
Package Thermal Characteristics (Note 1)
Electrical Characteristics
(VCCA - VGNDA = 3.0V to 5.5V, VCCB - VGNDB = 3.0V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at
VCCA - VGNDA = 3.3V, VCCB - VGNDB = 3.3V, and TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
DC CHARACTERISTICS
Supply Voltage VCCA Relative to GNDA 3.0 5.5 V
VCCB Relative to GNDB 3.0 5.5
Supply Current ICCA,
ICCB
Unidirectional inputs
at DC or 2Mbps;
bidirectional inputs at DC
or switching at 2Mbps,
no load
VCCA = +5V,
VCCB = +5V 7.2 11
mA
VCCA = +3.3V,
VCCB = +3.3V 6.2 9.5
All inputs switching at
max data rate. No load.
(Note 3)
VCCA
= +5V,
VCCB =
+5V
TA =
+25°C15 22
TA =
+125°C17 24
VCCA =
+3.3V,
VCCB =
+3.3V
TA =
+25°C10 16
TA =
+125°C11 18
Undervoltage-Lockout
Threshold VUVLO VCCA - VGNDA, VCCB - VGNDB (Note 4) 2 V
Undervoltage-Lockout
Hysteresis VUVLOHYS VCCA - VGNDA, VCCB - VGNDB (Note 4) 0.1 V
MAX14850
Six-Channel Digital Isolator
3Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(VCCA - VGNDA = 3.0V to 5.5V, VCCB - VGNDB = 3.0V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at
VCCA - VGNDA = 3.3V, VCCB - VGNDB = 3.3V, and TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
ISOLATION CHARACTERISTICS
Isolation Voltage VISO t = 60s (Note 5) 600 VRMS
Working Isolation Voltage VIOWM
VGNDB - VGNDA continuous (Note 3), 50-year life
expectancy (Figure 4)200 VRMS
ESD Protection All pins ±2.5 kV
LOGIC INPUTS AND OUTPUTS
Input Threshold Voltage VIT I/OA1, I/OA2, relative to GNDA 0.5 0.7 V
Input Logic-High Voltage VIH
INA1, INA2, relative to GNDA 0.7 x VCCA
V
INB1, INB2, relative to GNDB 0.7 x VCCB
I/OA1, I/OA2, relative to GNDA 0.7
I/OB1, I/OB2, relative to GNDB 0.7 x VCCB
Input Logic-Low Voltage VIL
INA1, INA2, relative to GNDA 0.8
V
INB1, INB2, relative to GNDB 0.8
I/OA1, I/OA2, relative to GNDA 0.5
I/OB1, I/OB2, relative to GNDB 0.3 x VCCB
Output Logic-High
Voltage VOH
OUTA1, OUTA2, relative to GNDA,
source current = 4mA VCCA - 0.4
V
OUTB1, OUTB2, relative to GNDB,
source current = 4mA VCCB - 0.4
Output Logic-Low
Voltage VOL
OUTA1, OUTA2, relative to GNDA,
sink current = 4mA 0.8
V
OUTB1, OUTB2, relative to GNDB,
sink current = 4mA 0.8
I/OA1, I/OA2, relative to GNDA,
sink current = 10mA 0.6 0.9
I/OA1, I/OA2, relative to GNDA,
sink current = 0.5mA 0.6 0.85
I/OB1, I/OB2, relative to GNDB,
sink current = 30mA 0.4
Input/Output Logic-Low
Threshold Difference DVTOL I/OA1, I/OA2 (Note 6) 50 mV
Input Capacitance CIN INA1, INA2, INB1, INB2, f = 1MHz 2 pF
DYNAMIC SWITCHING CHARACTERISTICS
Common-Mode Transient
Immunity dVISO/dt VIN = VCC_ or VGND_ (Notes 3, 7) 1.5 kV/Fs
MAX14850
Six-Channel Digital Isolator
4Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(VCCA - VGNDA = 3.0V to 5.5V, VCCB - VGNDB = 3.0V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at
VCCA - VGNDA = 3.3V, VCCB - VGNDB = 3.3V, and TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
Maximum Data Rate
(Note 3) DRMAX
INA1 to OUTB1, INA2 to OUTB2, INB1 to
OUTA1, INB2 to OUTA2 50
Mbps
I/OA1 to I/OB1, I/OA2 to I/OB2, I/OB1 to I/OA1,
I/OB2 to I/OA2 2
Minimum Pulse Width PWMIN
INA1 to OUTB1, INA2 to OUTB2, INB1 to
OUTA1, INB2 to OUTA2 (Note 3) 20 ns
Propagation Delay
(Note 3)
tDPLH
tDPHL
INA1 to OUTB1, INA2 to
OUTB2, INB1 to OUTA1,
INB2 to OUTA2, RL =
1MI, CL = 15pF, Figure 1
VCCA = VCCB =
+3.3V 20 30
ns
VCCA = VCCB = +5V 18 26
I/OA1 to I/OB1, I/OA2 to
I/OB2, R1 = 1.6kI, R2 =
180I, CL1 = CL2 = 15pF,
Figure 2
VCCA = VCCB =
+3.3V 30 100
VCCA = VCCB = +5V 30 100
I/OB1 to I/OA1, I/OB2 to
I/OA2, R1 = 1kI, R2 =
120I, CL1 = CL2 = 15pF,
Figure 2
VCCA = VCCB =
+3.3V 60 100
VCCA = VCCB = +5V 60 100
Pulse-Width Distortion
|tDPLH – tDPHL|
(Notes 3, 8)
PWD
INA1 TO OUTB1, INA2
TO OUTB2, INB1 TO
OUTA1, INB2 TO OUTA2,
RL = 1MI,
CL = 15pF, Figure 1
VCCA = VCCB =
+3.3V 7
ns
VCCA = VCCB = +5V 7
I/OA1 to I/OB1, I/OA2 to
I/OB2, R1 = 1.6kI, R2 =
180I, CL1 = CL2 = 15pF,
Figure 2
VCCA = VCCB =
+3.3V 12
VCCA = VCCB = +5V 12
I/OB1 to I/OA1, I/OB2 to
I/OA2, R1 = 1kI, R2 =
120I, CL1 = CL2 = 15pF,
Figure 2
VCCA = VCCB =
+3.3V 60
VCCA = VCCB = +5V 50
MAX14850
Six-Channel Digital Isolator
5Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(VCCA - VGNDA = 3.0V to 5.5V, VCCB - VGNDB = 3.0V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at
VCCA - VGNDA = 3.3V, VCCB - VGNDB = 3.3V, and TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
Channel-to-Channel
Skew (Notes 3, 8) tDSKEWCC
OUTB1 to OUTB2 output
skew, Figure 1
VCCA = VCCB =
+3.3V 3
ns
VCCA = VCCB = +5V 3
OUTA1 to OUTA2 output
skew, Figure 1
VCCA = VCCB =
+3.3V 3
VCCA = VCCB = +5V 3
I/OB1 to I/OB2 output
skew, Figure 2
VCCA = VCCB =
+3.3V 6
VCCA = VCCB = +5V 5
I/OA1 to I/OA2 output
skew, Figure 2
VCCA = VCCB =
+3.3V 20
VCCA = VCCB = +5V 20
Part-to-Part Skew
(Notes 3, 8) tDSKEWPP DtDPLH, DtDPHL 8 ns
Rise Time (Note 3) tR
OUTA1, OUTA2, OUTB1, OUTB2, 10% to 90%,
Figure 1 5 ns
Fall Time (Note 3) tF
OUTA1, OUTA2, OUTB1, OUTB2, 90% to 10%,
Figure 1 5
ns
I/OA1, I/OA2, 90% to
10%, R1 = 1.6kW, R2 =
180W, CL1 = CL2 = 15pF,
Figure 2
VCCA = VCCB =
+3.3V 30 60
VCCA = VCCB = +5V 40 80
I/OB1, I/OB2, 90% to
10%, R1 = 1kW, R2 =
120W, CL1 = CL2 = 15pF,
Figure 2
VCCA = VCCB =
+3.3V 3 6
VCCA = VCCB = +5V 3 5
MAX14850
Six-Channel Digital Isolator
6Maxim Integrated
INSULATION AND SAFETY CHARACTERISTICS
Note 2: All units are production tested at TA = +25°C. Specifications over temperature are guaranteed by design. All voltages of
side A are referenced to GNDA. All voltages of side B are referenced to GNDB, unless otherwise noted.
Note 3: Guaranteed by design. Not production tested.
Note 4: 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 5: The isolation is guaranteed for t = 60s, and tested at 120% of the guaranteed value for 1s.
Note 6: DVTOL = VOL – VIL. This is the minimum difference between the output logic-low voltage and the input logic threshold for
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 7: The common-mode transient immunity guarantees that the device will hold its outputs stable when the isolation voltage
changes at the specified rate.
Note 8: 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 chan-
nels 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.
PARAMETER SYMBOL CONDITIONS VALUE UNIT
IEC INSULATION AND SAFETY RELATED FOR SPECIFICATIONS FOR SOIC-16
External Tracking (Creepage) CPG IEC 60664-1 SOIC-16 4.2 mm
QSOP-16 3.81 mm
External Air Gap (Clearance) CLR IEC 60664-1 SOIC-16 4.2 mm
QSOP-16 3.81 mm
Minimum Internal Gap Insulation Thickness 0.0026 mm
Tracking Resistance
(Comparative Tracking Index) CTI IEC 112 / VDE 030 Part 1 175 V
Insulation Resistance Across
Barrier RISO 1GI
Capacitance Across Isolation
Barrier CIO f = 1MHz 12 pF
VDE IEC INSULATION CHARACTERISTICS
Surge Isolation Voltage VIOSM IEC 60747-17, section 5.3.1.6 and 5.4.6 for basic
insulation 1 kVpeak
Repetitive Peak Isolation Voltage VIORM IEC 60747-17, section 5.3.1.3 282 Vpeak
Rated Transient Isolation Voltage VIOTM IEC 60747-17, section 5.3.1.4 850 Vpeak
Safety Limiting Temperature TSIEC 60747-17, section 7.2.1 150 NC
Safety Limiting Side A Power
Dissipation PSA IEC 60747-17, section 7.2.1 0.75 W
Safety Limiting Side B Power
Dissipation PSB IEC 60747-17, section 7.2.1 0.75 W
Apparent Charge Method qpd IEC 60747-17, section 7.4, method a & b 5 pC
Overvoltage Category IEC 60664-1, single or three phase 50V DC or AC I,II —
Overvoltage Category IEC 60664-1, single or three phase 100V DC or AC I —
Climatic Category 40/125/21 —
Pollution Degree DIN VDE 0110, Table 1 2 —
MAX14850
Six-Channel Digital Isolator
7Maxim Integrated
Test Circuits/Timing Diagrams
Figure 1. Test Circuit (A) and Timing Diagram (B) for Unidirectional Channels
Figure 2. Test Circuit (A) and Timing Diagrams (B) and (C) for Bidirectional Channels
0.1µF VCCB
VCCA
TEST
SOURCE
INA_ OUTB_
MAX14850
GNDA GNDB
VCCA VCCB
CLRL
0.1µF
50Ω
(A)
(B)
VCCA
INA1, INA2 50% 50%
50%
50%
90%
10%
50%
tDPHL
tDSKEWCC
tF
tR
tDPLH
OUTB1
OUTB2
VCCB
VCCB
GNDA
GNDB
GNDB
VCCA
I/OA1, I/OA2
(A)
(B)
50% 50%
50%
90%
50%
10%
50%
tDPHL
tDSKEWCC
tF
tDPLH
I/OB1
I/OB2
VCCB
VCCB
GNDA
VOL(min)
VOL(min)
VCCB
I/OB1, I/OB2
(C)
50% 50%
50%
50%
90%
10%
50%
tDPHL
tF
tDPLH
I/OA1
I/OA2
VCCA
VCCA
GNDB
VOL(min)
VOL(min)
tDSKEWCC
0.1µF VCCB
VCCA
TEST
SOURCE
I/OA_ I/OB_
MAX14850
GNDA GNDB
VCCA VCCB
CL2
CL1
0.1µF R2
R1
MAX14850
Six-Channel Digital Isolator
8Maxim Integrated
Typical Operating Characteristics
(VCCA – VGNDA = 3.3V, VCCB – VGNDB = 3.3V, all inputs idle, TA = +25NC, unless otherwise noted.
ICCA vs. DATA RATE
MAX14850 toc01
DATA RATE (Mbps)
ICCA (mA)
1010.10.01
1
2
3
4
5
6
7
8
9
0
0.001 100
INA1/INA2
SWITCHING
INB1/INB2
SWITCHING
ICCB vs. DATA RATE
MAX14850 toc02
DATA RATE (Mbps)
ICCB (mA)
1010.10.01
1
2
3
4
5
6
7
8
9
0
0.001 100
INB1/INB2
SWITCHING
INA1/INA2
SWITCHING
ICCA vs. DATA RATE
MAX14850 toc03
DATA RATE (Mbps)
ICCA (mA)
10.10.01
1
2
3
4
5
6
7
0
0.001 10
I/OA1/I/OA2
SWITCHING I/OB1/I/OB2
SWITCHING
PULLUP = 2k
ICCB vs. DATA RATE
MAX14850 toc04
DATA RATE (Mbps)
ICCB (mA)
10.10.01
1
2
3
4
5
6
7
8
0
0.001 10
I/OB1/I/OB2
SWITCHING I/OA1/I/OA2
SWITCHING
PULLUP = 2k
ICCA vs. VCCA
MAX14850 toc05
VCCA (V)
ICCA (mA)
5.04.54.03.5
1
2
3
4
5
6
7
8
9
10
0
3.0 5.5
TA = +25°C
TA = -40°C TA = +125°C
ICCB vs. VCCB
MAX14850 toc06
VCCB (V)
ICCB (mA)
5.04.54.03.5
1
2
3
4
5
6
7
8
9
10
0
3.0 5.5
TA = -40°C
TA = -40°C
TA = +125°C
ICC vs.TEMPERATURE
MAX14850 toc07
TEMPERATURE (°C)
ICC (mA)
1109565 80-10 5 20 35 50-25
1
2
3
4
5
6
7
8
9
0
-40 125
ICCB
ICCA
OUTA_ VOH vs. SOURCE CURRENT
MAX14850 toc08
ISOURCE (mA)
OUTA_ VOH (V)
60453015
1
2
3
4
5
0
07
5
VCCA = 5V
VCCA = 3.3V
OUTA_ VOL vs. SINK CURRENT
MAX14850 toc09
ISINK (mA)
OUTA_ VOL (V)
60453015
1
2
3
4
5
0
07
5
VCCA = 5V
VCCA = 3.3V
MAX14850
Six-Channel Digital Isolator
9Maxim Integrated
Typical Operating Characteristics (continued)
(VCCA – VGNDA = 3.3V, VCCB – VGNDB = 3.3V, all inputs idle, TA = +25NC, unless otherwise noted.
OUTB_ VOH vs. SOURCE CURRENT
MAX14850 toc10
ISOURCE (mA)
OUTB_ VOH (V)
60453015
1
2
3
4
5
0
07
5
VCCB = 3.3V
VCCB = 5V
OUTB_ VOL vs. SINK CURRENT
MAX14850 toc11
ISINK (mA)
OUTB_ VOL (V)
60453015
1
2
3
4
5
0
07
5
VCCB = 3.3V
VCCB = 5V
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX1960 toc12
VDDA (V)
PROPAGATION DELAY (ns)
5.04.53.5 4.0
2
4
6
8
12
10
14
16
0
3.0 5.5
VGNDB - VGNDA = -100V
VGNDB - VGNDA = +100V
VGNDB - VGNDA = 0V
VDDA = VDDB
INA_ TO OUTB_
LOW TO HIGH TRANSITION
VDDA (V)
PROPAGATION DELAY (ns)
5.04.54.03.5
2
4
6
8
10
12
0
3.0 5.5
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX14850 toc13
VGNDB - VGNDA = -100V
VGNDB - VGNDA = +100V
VGNDB - VGNDA = 0V
VDDA = VDDB
INA_ TO OUTB_
HIGH TO LOW TRANSITION
PROPAGATION DELAY
vs.CAPACITIVE LOAD
MAX14850 toc14
CL (pF)
PROPAGATION DELAY (ns)
80604020
2
4
6
8
10
12
14
16
18
0
0 100
HIGH TO LOW
INA_ TO OUTB_
LOW TO HIGH
PROPAGATION DELAY
vs. TEMPERATURE
MAX14850 toc15
TA (°C)
PROPAGATION DELAY (ns)
1109565 80-10 5 20 35 50-25
2
4
6
8
10
12
14
16
18
0
-40 125
HIGH TO LOW
INA_ TO OUTB_
LOW TO HIGH
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX1960 toc16
VDDA (V)
PROPAGATION DELAY (ns)
5.04.53.5 4.0
2
4
6
8
12
10
14
16
0
3.0 5.5
VGNDB - VGNDA = +100V
VGNDB - VGNDA = -100V
VGNDB - VGNDA = 0V
VDDA = VDDB
INB_ TO OUTA_
LOW TO HIGH TRANSITION
VDDA (V)
PROPAGATION DELAY (ns)
5.04.54.03.5
2
4
6
8
10
12
0
3.0 5.5
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX14850 toc17
VGNDB - VGNDA = -100V
VGNDB - VGNDA = +100V
VGNDB - VGNDA = 0V
VDDA = VDDB
INB_ TO OUTA_
HIGH TO LOW TRANSITION
PROPAGATION DELAY
vs. CAPACITIVE LOAD
MAX14850 toc18
CL (pF)
PROPAGATION DELAY (ns)
80604020
2
4
6
8
10
12
14
16
18
20
0
0 100
HIGH TO LOW
INB_ TO OUTA_
LOW TO HIGH
MAX14850
Six-Channel Digital Isolator
10Maxim Integrated
Typical Operating Characteristics (continued)
(VCCA – VGNDA = 3.3V, VCCB – VGNDB = 3.3V, all inputs idle, TA = +25NC, unless otherwise noted.
PROPAGATION DELAY
vs. TEMPERATURE
MAX14850 toc19
TA (°C)
PROPAGATION DELAY (ns)
1109565 80-10 5 20 35 50-25
2
4
6
8
10
12
14
16
18
0
-40 125
HIGH TO LOW
INB_ TO OUTA_
LOW TO HIGH
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX14850 toc20
VDDA (V)
PROPAGATION DELAY (ns)
5.04.54.03.5
5
10
15
20
25
30
35
0
3.0 5.5
VGNDB - VGNDA = -100V
VGNDB - VGNDA = 0V
VGNDB - VGNDA = +100V
VDDA = VDDB
I/OA_ TO I/OB_
LOW TO HIGH TRANSITION
PULLUP = 1kI
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX14850 toc21
VDDA (V)
PROPAGATION DELAY (ns)
5.04.54.03.5
5
10
15
20
0
3.0 5.5
VGNDB - VGNDA = -100V
VGNDB - VGNDA = 0V
VGNDB - VGNDA = +100V
VDDA = VDDB
I/OA_ TO I/OB_
HIGH TO LOW TRANSITION
VDDA (V)
PROPAGATION DELAY (ns)
5.04.54.03.5
5
10
15
20
25
30
0
3.0 5.5
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX14850 toc23
VGNDB - VGNDA = -100V
VGNDB - VGNDA = 0V
VGNDB - VGNDA = +100V
VDDA = VDDB
I/OB_ TO I/OA_
LOW TO HIGH TRANSITION
PULLUP = 1kI
PROPAGATION DELAY
vs. TEMPERATURE
MAX14850 toc25
PROPAGATION DELAY (ns)
10
20
30
40
50
60
0
TA (°C)
1109580655035205-10-25-40 125
LOW TO HIGH
I/OB_ TO I/OA_
PULLUP = 1kI
HIGH TO LOW
PROPAGATION DELAY
vs.TEMPERATURE
MAX14850 toc22
TA (°C)
PROPAGATION DELAY (ns)
1109580655035205-10-25
10
20
30
40
50
0
-40 125
HIGH TO LOW
I/OA_ TO I/OB_
PULLUP = 1kI
LOW TO HIGH
VDDA (V)
PROPAGATION DELAY (ns)
5.04.54.03.5
10
20
30
40
50
60
0
3.0 5.5
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
MAX14850 toc24
VGNDB - VGNDA = -100V
VGNDB - VGNDA = 0V
VGNDB - VGNDA = +100V
VDDA = VDDB
I/OB_ TO I/OA_
HIGH TO LOW TRANSITION
MAX14850
Six-Channel Digital Isolator
11Maxim Integrated
Pin Description
Pin Conguration
PIN NAME FUNCTION VOLTAGE RELATIVE TO
1 VCCA Supply Voltage of Logic Side A. Bypass VCCA with a 0.1FF ceramic
capacitor to GNDA. GNDA
2 INA1 Logic Input 1 on Side A. INA1 is translated to OUTB1. GNDA
3 INA2 Logic Input 2 on Side A. INA2 is translated to OUTB2. GNDA
4 OUTA1 Logic Output 1 on Side A. OUTA1 is a push-pull output. GNDA
5 OUTA2 Logic Output 2 on Side A. OUTA2 is a push-pull output. GNDA
6 I/OA1 Bidirectional Input/Output 1 on Side A. I/OA1 is translated to/from I/OB1
and is a open-drain output. GNDA
7 I/OA2 Bidirectional Input/Output 2 on Side A. I/OA2 is translated to/from I/OB2
and is a open-drain output. GNDA
8 GNDA Ground Reference for Side A —
9 GNDB Ground Reference for Side B —
10 I/OB2 Bidirectional Input/Output 2 on Side B. I/OB2 is translated to/from I/OA2
and is a open-drain output. GNDB
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
VCCA VCCB
OUTB1
OUTB2
INB1
INB2
I/OB1
I/OB2
GNDB
TOP VIEW
INA1
INA2
I/OA1
OUTA1
OUTA2
I/OA2
GNDA
MAX14850
+
SOIC/QSOP
MAX14850
Six-Channel Digital Isolator
12Maxim Integrated
Functional Diagram Detailed Description
The MAX14850 is a six-channel digital isolator. The
device is rated for 600VRMS 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 I2C, SPI/MICROWIRE®, and other serial
busses can be achieved with the MAX14850. The
device features two supply inputs, VCCA and VCCB, that
independently set the logic levels on either side of the
device. VCCA and VCCB 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 200VRMS 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 VCCB Supply Voltage of Logic Side B. Bypass VCCB with a 0.1FF ceramic
capacitor to GNDB. GNDB
MAX14850
INA1
VCCA VCCB
GNDA GNDB
600VRMS
DIGITAL
ISOLATOR
INA2
OUTA1
OUTA2
I/OA1
I/OA2
OUTB1
OUTB2
INB1
INB2
I/OB1
I/OB2
MAX14850
Six-Channel Digital Isolator
13Maxim Integrated
Ground Isolation/Level Shifting
The MAX14850 tolerates a ground difference of 600VRMS.
Therefore, VGNDA can be 850VDC higher or lower than
VGNDB. In addition, the device translates logic levels
when (VCCA–VGNDA) is higher or lower voltage than
(VCCB–VGNDB), 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 resis-
tors. 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 (VIT) 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
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).
Startup and Undervoltage Lockout
The VCCA and VCCB supplies are both internally
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
outputs are pulled high internally to the voltage of the VCCA
or VCCB 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 MAX14850ASE+ is safety certified by UL, CSA, and
IEC 60747-5-2. Per UL1577, the MAX14850 is 100%
tested at an equivalent VISO of 720VRMS for one second
(see Table 2).
Figure 3 shows the behavior of the outputs during power-
up and power-down.
MAX14850AEE+ has not been submitted for certification.
Table 2. Safety Regulatory Approvals (Pending) (MAX14850ASE+)
Table 1. Output Behavior During Undervoltage Conditions
VIN VCCA VCCB VOUTA_ VOUTB_
1 Powered Powered 1 1
0 Powered Powered 0 0
XUnder Voltage Powered Follows VCCA 1
X Powered Under Voltage 1Follows VCCB
SAFETY AGENCY STANDARD ISOLATION NUMBER FILE NUMBER
UL UL1577 Recognized 600VRMS isolation voltage for 60 seconds E351759
VDE Approved to 60747-17 Basic insulation, 600VRMS for 60 seconds Pending
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 VCCA and VCCB. 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 VCCA and VCCB 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 (VIOWM) - VRMS
WORKING LIFE - YEARS (LOG SCALE)
700600500400300200100
0.1
1
10
100
50
1000
0.001
0 800
VIOWM = 200VRMS
VCCA
VCCB
VOUTA
_
VOUTB
_
VI/OA_
VI/OB_
400µs/div
5V/div
MAX14850
Six-Channel Digital Isolator
15Maxim Integrated
Typical Operating Circuits (continued)
I/OA
1S
DA
SCL
RST DAC
LDAC
SDA
I/OA2SCL
INA1GPIO1 RESET
LOAD DAC
INA2GPIO2
OUTA1
OUTA2
I/OB1
I/OB2
OUTB1
OUTB2
INB1
INB2
GPIO3
SPARE
µC
GNDA GNDB
VCCA VCCB
RPUARPUARPUB
RPUB
0.1µF 0.1µF
3.3V 5V
VCCB MONITOR
MAX14850
600VRMS
ISOLATION
MAX14850
Six-Channel Digital Isolator
16Maxim Integrated
Chip Information
PROCESS: BiCMOS
Ordering Information
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and Reel
Package Information
For the latest package outline information and land patterns (foot-
prints), 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.
Typical Operating Circuits (continued)
PART TEMP RANGE PIN-PACKAGE
MAX14850ASE+T -40NC to +125NC16 SOIC
MAX14850ASE+ -40NC to +125NC16 SOIC
MAX14850AEE+ -40NC to +125NC16 QSOP
MAX14850AEE+T -40NC to +125NC16 QSOP
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
16 SOIC S16+3 21-0041 90-0097
16 QSOP E16+1 21-0055 90-0167
I/OA1GPIO1
OUTA1RX
I/OA2
INA1RTS
INA2TX
OUTA2
I/OB1
INB1
I/OB2
OUTB1
OUTB2
INB2GPIO3
µC
GNDA GNDB
VCCA VCCB
RPUA
RPUB
0.1µF 0.1µF
3.3V 5V
VCCB MONITOR
MAX13085E
600VRMS
ISOLATION
RE
RO
DE
DI
A
B
MAX14850
MAX14850
Six-Channel Digital Isolator
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 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 17
© 2014 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 3/12 Initial release —
1 5/14 Updated General Description, Benefits and Features, Bidirectional Channels
section, Table 2, and Typical Operating Circuits 1, 13, 15, 16
2 11/14 Added QSOP package and related information
Added additional package and ordering information for QSOP 1, 2, 6, 11, 13, 16
