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MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
General Description
Benefits and Features
The MAX14434–MAX14436 family offers all three
possible unidirectional channel configurations to
accommodate any 4-channel design, including SPI,
RS-232, RS-485, and digital I/O applications. Output
enable for the A side of the MAX14435R/S/U/V is activelow, making them ideal for isolating a port on a shared
SPI bus since the CS signal can directly enable the MISO
signal on the isolator. All other devices in the family have
the traditional active-high enable.
●● Low Power Consumption
• 1.1mW per Channel at 1Mbps with VDD = 3.3V
• 3.5mW per Channel at 100Mbps with VDD = 1.8V
The MAX14434–MAX14436 are the fastest, lowest power,
4-channel, digital galvanic isolators on the market today
using Maxim’s proprietary process technology. These
devices transfer digital signals between circuits with
different power domains while using as little as 0.58mW per
channel at 1Mbps with a 1.8V supply. The MAX14434/5/6
have an isolation rating of 5kVRMS for 60 seconds.
Devices are available with a maximum data rate of either
25Mbps or 200Mbps and with outputs that are either
default-high or default-low. The default is the state the
output assumes when the input is either not powered
or is open-circuit. See the Ordering Information for suffixes associated with each option. Independent 1.71V to
5.5V supplies on each side of the isolator also make the
devices suitable for use as level translators.
The MAX14434–MAX14436 are available in a 16-pin widebody SOIC package with 8mm of creepage and clearance.
The package material has a minimum comparative tracking index (CTI) of 600V, which gives it a group 1 rating
in creepage tables. All devices are rated for operation at
ambient temperatures of -40°C to +125°C.
●● Robust Galvanic Isolation for Fast Digital Signals
• 200Mbps Data Rate
• Withstands 5kVRMS for 60s (VISO)
• Continuously Withstands 848VRMS (VIOWM)
• Withstands ±10kV Surge between GNDA and
GNDB with 1.2/50μs waveform
• High CMTI (50kV/μs, Typical)
●● Options to Support a Broad Range of Applications
• 2 Data Rates (25Mbps, 200Mbps)
• 3 Channel Direction Configurations
• 2 Output Default States (High/Low)
Applications
●●
●●
●●
●●
●●
Fieldbus Communications for Industrial Automation
Isolated RS-485/RS-422, CAN
General Isolation Application
Battery Management
Medical Systems
Safety Regulatory Approvals (Pending)
●● UL According to UL1577
●● cUL According to CSA Bulletin 5A
●● VDE 0884-10
Ordering Information appears at end of data sheet.
19-100102; Rev 3; 1/19
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Absolute Maximum Ratings
VDDA to GNDA.........................................................-0.3V to +6V
VDDB to GNDB.........................................................-0.3V to +6V
IN_, EN_ on Side A to GNDA...................................-0.3V to +6V
IN_, EN_ on Side B to GNDB..................................-0.3V to +6V
OUT_ on Side A to GNDA....................... -0.3V to (VDDA + 0.3V)
OUT_ on Side B to GNDB...................... -0.3V to (VDDB + 0.3V)
Short-Circuit Duration
OUT_ on Side A to GNDA,
OUT_ on Side B to GNDB......................................Continuous
Continuous Power Dissipation (TA = +70°C)
Wide SOIC (derate 14.1mW/°C above +70°C).......1126.8mW
Operating Temperature Range.......................... -40°C to +125°C
Maximum Junction Temperature......................................+150°C
Storage Temperature Range............................. -60°C to +150°C
Soldering Temperature (reflow)........................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only; 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
PACKAGE TYPE: 16 WIDE SOIC
Package Code
W16MS+12
Outline Number
21-0042
Land Pattern Number
90-0107
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
71°C/W
Junction to Case (θJC)
24°C/W
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.
DC Electrical Characteristics
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, CL = 15pF, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY
Supply Voltage
VDDA
Relative to GNDA
1.71
5.5
VDDB
Relative to GNDB
1.71
5.5
VDD_ rising
1.5
Undervoltage-Lockout
Threshold
VUVLO_
Undervoltage-Lockout
Threshold Hysteresis
VUVLO_HYST
www.maximintegrated.com
1.6
45
1.66
V
V
mV
Maxim Integrated │ 2
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
DC Electrical Characteristics (continued)
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, CL = 15pF, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
500kHz square
wave, CL = 0pF
Supply Current (MAX14434_)
(Note 2)
IDDA
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
500kHz square
wave, CL = 0pF
Supply Current (MAX14434_)
(Note 2)
IDDB
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
500kHz square
wave, CL = 0pF
Supply Current (MAX14435_)
(Note 2)
IDDA
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
www.maximintegrated.com
TYP
MAX
VDDA = 5V
MIN
0.52
0.96
VDDA = 3.3V
0.51
0.93
VDDA = 2.5V
0.50
0.92
VDDA = 1.8V
0.49
0.64
VDDA = 5V
1.63
2.42
VDDA = 3.3V
1.59
2.36
VDDA = 2.5V
1.58
2.33
VDDA = 1.8V
1.54
2.00
VDDA = 5V
4.5
6.14
VDDA = 3.3V
4.39
6.00
VDDA = 2.5V
4.35
5.93
VDDA = 1.8V
4.21
5.43
VDDB = 5V
0.87
1.47
VDDB = 3.3V
0.82
1.41
VDDB = 2.5V
0.81
1.39
VDDB = 1.8V
0.79
1.32
VDDB = 5V
2.97
3.84
VDDB = 3.3V
2.00
2.74
VDDB = 2.5V
1.69
2.36
VDDB = 1.8V
1.43
2.02
VDDB = 5V
9.52
11.17
VDDB = 3.3V
5.68
6.88
VDDB = 2.5V
4.45
5.38
VDDB = 1.8V
3.46
4.18
VDDA = 5V
0.62
1.10
VDDA = 3.3V
0.60
1.06
VDDA = 2.5V
0.59
1.05
VDDA = 1.8V
0.57
0.83
VDDA = 5V
1.98
2.80
VDDA = 3.3V
1.70
2.47
VDDA = 2.5V
1.61
2.35
VDDA = 1.8V
1.52
2.02
VDDA = 5V
5.77
7.43
VDDA = 3.3V
4.73
6.25
VDDA = 2.5V
4.38
5.81
VDDA = 1.8V
4.03
5.15
UNITS
mA
mA
mA
Maxim Integrated │ 3
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
DC Electrical Characteristics (continued)
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, CL = 15pF, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
500kHz square
wave, CL = 0pF
Supply Current (MAX14435_)
(Note 2)
IDDB
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
500kHz square
wave, CL = 0pF
IDDA
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
Supply Current (MAX14436_)
(Note 2)
500kHz square
wave, CL = 0pF
IDDB
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
www.maximintegrated.com
MIN
TYP
MAX
VDDB = 5V
0.78
1.35
VDDB = 3.3V
0.75
1.30
VDDB = 2.5V
0.74
1.28
VDDB = 1.8V
0.72
1.16
VDDB = 5V
2.64
3.49
VDDB = 3.3V
1.90
2.65
VDDB = 2.5V
1.66
2.36
VDDB = 1.8V
1.46
2.03
VDDB = 5V
8.26
9.91
VDDB = 3.3V
5.36
6.66
VDDB = 2.5V
4.42
5.52
VDDB = 1.8V
3.66
4.51
VDDA = 5V
0.70
1.22
VDDA = 3.3V
0.67
1.17
VDDA = 2.5V
0.66
1.16
VDDA = 1.8V
0.64
0.99
VDDA = 5V
2.31
3.15
VDDA = 3.3V
1.81
2.56
VDDA = 2.5V
1.64
2.35
VDDA = 1.8V
1.50
2.02
VDDA = 5V
7.04
8.70
VDDA = 3.3V
5.06
6.46
VDDA = 2.5V
4.40
5.67
VDDA = 1.8V
3.85
4.83
VDDB = 5V
0.70
1.24
VDDB = 3.3V
0.67
1.19
VDDB = 2.5V
0.66
1.17
VDDB = 1.8V
0.65
1.00
VDDB = 5V
2.31
3.15
VDDB = 3.3V
1.80
2.57
VDDB = 2.5V
1.64
2.36
VDDB = 1.8V
1.49
2.03
VDDB = 5V
7.01
8.66
VDDB = 3.3V
5.04
6.46
VDDB = 2.5V
4.40
5.67
VDDB = 1.8V
3.84
4.83
UNITS
mA
mA
mA
Maxim Integrated │ 4
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
DC Electrical Characteristics (continued)
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, CL = 15pF, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC INPUTS AND OUTPUTS
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Pullup Current (Note 3)
Input Pulldown Current (Note 3)
EN Pullup Current (Note 3)
VIH
VIL
VHYS
EN_, IN_,
relative to GND_
2.25V ≤ VDD_ ≤ 5.5V
0.7 x
VDD_
EN_, IN_,
relative to GND_
1.71V ≤ VDD_ < 2.25V
0.75 x
VDD_
EN_, IN_,
relative to GND_
2.25V ≤ VDD_ ≤ 5.5V
0.8
EN_, IN_,
relative to GND_
1.71V ≤ VDD_ < 2.25V
0.7
EN_, IN_,
relative to GND_
MAX1443_ B/E/R/U
EN_, IN_,
relative to GND_
MAX1443_C/F/S/V
V
mV
80
IN_, MAX1443_B/C/R/S
IPD
IN_, MAX1443_E/F/U/V
1.5
EN_
-10
Input Capacitance
CIN
IN_, fSW = 1MHz
Output Voltage High (Note 3)
VOH
VOUT_ relative to GND_
IOUT_ = 4mA source
Output Voltage Low (Note 3)
VOL
VOUT_ relative to GND_
IOUT_ = 4mA sink
www.maximintegrated.com
410
IPU
IPU_EN
V
-10
-5
-1.5
µA
5
10
µA
-5
-1.5
µA
2
pF
VDD_
- 0.4
V
0.4
V
Maxim Integrated │ 5
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Dynamic Characteristics MAX1443_C/F/S/V
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, CL = 15pF, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.) (Note 3)
PARAMETER
Common-Mode Transient
Immunity
SYMBOL
CMTI
Maximum Data Rate
DRMAX
Minimum Pulse Width
PWMIN
tPLH
Propagation Delay
(Figure 1)
tPHL
Pulse Width Distortion
PWD
tSPLH
IN_ = GND_ or VDD_ (Note 4)
200
1.71V ≤ VDD_ ≤ 1.89V
150
IN_ to
OUT_,
CL = 15pF
IN_ to
OUT_,
CL = 15pF
MAX
50
2.25V ≤ VDD_ ≤ 5.5V
IN_ to
OUT_
TYP
Mbps
2.25V ≤ VDD_ ≤ 5.5V
5
1.71V ≤ VDD_ ≤ 1.89V
6.67
4.5V ≤ VDD_ ≤ 5.5V
4.1
5.4
9.2
3.0V ≤ VDD_ ≤ 3.6V
4.2
5.9
10.2
2.25V ≤ VDD_ ≤ 2.75V
4.9
7.1
13.4
1.71V ≤ VDD_ ≤ 1.89V
7.1
10.9
20.3
4.5V ≤ VDD_ ≤ 5.5V
4.3
5.6
9.4
3.0V ≤ VDD_ ≤ 3.6V
4.4
6.2
10.5
2.25V ≤ VDD_ ≤ 2.75V
5.1
7.3
14.1
1.71V ≤ VDD_ ≤ 1.89V
7.2
10.9
21.7
0.3
2
|tPLH -tPHL|
UNITS
kV/µs
4.5V ≤ VDD_ ≤ 5.5V
3.7
3.0V ≤ VDD_ ≤ 3.6V
4.3
6
1.71V ≤ VDD_ ≤ 1.89V
10.3
4.5V ≤ VDD_ ≤ 5.5V
3.8
3.0V ≤ VDD_ ≤ 3.6V
4.7
2.25V ≤ VDD_ ≤ 2.75V
6.5
1.71V ≤ VDD_ ≤ 1.89V
11.5
tSCSLH
1.71V ≤ VDD_ ≤ 5.5V
1.5
tSCSHL
1.71V ≤ VDD_ ≤ 5.5V
1.5
tSPHL
www.maximintegrated.com
MIN
2.25V ≤ VDD_ ≤ 2.75V
Propagation Delay Skew
Part-to-Part (Same Channel)
Propagation Delay Skew
Channel-to-Channel
(Same Direction)
CONDITIONS
ns
ns
ns
ns
ns
Maxim Integrated │ 6
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Dynamic Characteristics MAX1443_C/F/S/V (continued)
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, CL = 15pF, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
tSCOLH
Propagation Delay Skew
Channel-to-Channel
(Opposite Direction)
tSCOHL
Peak Eye Diagram Jitter
Clock Jitter RMS
Rise Time
Fall Time
Enable to Data Valid
Enable to Tristate
www.maximintegrated.com
TJIT(PK)
TJCLK(RMS)
tR
tF
tEN
tTRI
CONDITIONS
MIN
TYP
MAX
4.5V ≤ VDD_ ≤ 5.5V
2.9
3.0V ≤ VDD_ ≤ 3.6V
3.4
2.25V ≤ VDD_ ≤ 2.75V
4.9
1.71V ≤ VDD_ ≤ 1.89V
10.2
4.5V ≤ VDD_ ≤ 5.5V
3.2
3.0V ≤ VDD_ ≤ 3.6V
3.8
2.25V ≤ VDD_ ≤ 2.75V
5.3
1.71V ≤ VDD_ ≤ 1.89V
10.9
UNITS
ns
200Mbps
90
ps
500kHz Clock Input, Rising/Falling Edges
6.5
ps
4.5V ≤ VDD_ ≤ 5.5V
1.6
3.0V ≤ VDD_ ≤ 3.6V
2.2
2.25V ≤ VDD_ ≤ 2.75V
3
1.71V ≤ VDD_ ≤ 1.89V
4.5
4.5V ≤ VDD_ ≤ 5.5V
1.4
3.0V ≤ VDD_ ≤ 3.6V
2
2.25V ≤ VDD_ ≤ 2.75V
2.8
1.71V ≤ VDD_ ≤ 1.89V
5.1
ENA to
OUT_,
ENB to
OUT_,
CL = 15pF
4.5V ≤ VDD_ ≤ 5.5V
3.5
3.0V ≤ VDD_ ≤ 3.6V
5.8
2.25V ≤ VDD_ ≤ 2.75V
9.3
1.71V ≤ VDD_ ≤ 1.89V
17.4
ENA to
OUT_,
ENB to
OUT_,
CL = 15pF
4.5V ≤ VDD_ ≤ 5.5V
6.4
3.0V ≤ VDD_ ≤ 3.6V
9.2
2.25V ≤ VDD_ ≤ 2.75V
12.8
1.71V ≤ VDD_ ≤ 1.89V
19.4
ns
ns
ns
ns
Maxim Integrated │ 7
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Dynamic Characteristics MAX1443_B/E/R/U
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, CL = 15pF, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.) (Note 3)
PARAMETER
Common-Mode Transient
Immunity
SYMBOL
CMTI
Maximum Data Rate
DRMAX
Minimum Pulse Width
PWMIN
Glitch Rejection
Propagation Delay
(Figure 1)
IN_ to
OUT_,
CL = 15pF
PWD
|tPLH -tPHL|
Propagation Delay Skew
Channel-to-Channel
(Same Direction)
ns
ns
29
4.5V ≤ VDD_ ≤ 5.5V
17.4
23.9
32.5
3.0V ≤ VDD_ ≤ 3.6V
17.6
24.4
33.7
2.25V ≤ VDD_ ≤ 2.75V
18.3
25.8
36.7
1.71V ≤ VDD_ ≤ 1.89V
20.7
29.6
43.5
4.5V ≤ VDD_ ≤ 5.5V
16.9
23.4
33.6
3.0V ≤ VDD_ ≤ 3.6V
17.2
24.2
35.1
2.25V ≤ VDD_ ≤ 2.75V
17.8
25.4
38.2
1.71V ≤ VDD_ ≤ 1.89V
19.8
29.3
45.8
0.4
4
15.4
1.71V ≤ VDD_ ≤ 1.89V
20.5
4.5V ≤ VDD_ ≤ 5.5V
13.9
3.0V ≤ VDD_ ≤ 3.6V
14.2
16
21.8
tSCSLH
1.71V ≤ VDD_ ≤ 5.5V
2
tSCSHL
1.71V ≤ VDD_ ≤ 5.5V
2
4.5V ≤ VDD_ ≤ 5.5V
13.9
3.0V ≤ VDD_ ≤ 3.6V
13.7
2.25V ≤ VDD_ ≤ 2.75V
14.2
1.71V ≤ VDD_ ≤ 1.89V
19.4
tSCOHL
ns
15
2.25V ≤ VDD_ ≤ 2.75V
1.71V ≤ VDD_ ≤ 1.89V
Propagation Delay Skew
Channel-to-Channel
(Opposite Direction)
ns
15.1
2.25V ≤ VDD_ ≤ 2.75V
tSCOLH
www.maximintegrated.com
Mbps
40
17
3.0V ≤ VDD_ ≤ 3.6V
UNITS
kV/µs
50
10
4.5V ≤ VDD_ ≤ 5.5V
tSPHL
MAX
25
IN_ to
OUT_,
CL = 15pF
Propagation Delay Skew
Part-to-Part (Same Channel)
TYP
IN_ to OUT_
tPHL
tSPLH
MIN
IN_ = GND_ or VDD_ (Note 4)
IN_ to OUT_
tPLH
Pulse Width Distortion
CONDITIONS
4.5V ≤ VDD_ ≤ 5.5V
13
3.0V ≤ VDD_ ≤ 3.6V
12.9
2.25V ≤ VDD_ ≤ 2.75V
14.4
1.71V ≤ VDD_ ≤ 1.89V
20.1
ns
ns
ns
Maxim Integrated │ 8
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Dynamic Characteristics MAX1443_B/E/R/U (continued)
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, CL = 15pF, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.) (Note 3)
PARAMETER
Peak Eye Diagram Jitter
Rise Time (Figure 1)
Fall Time (Figure 1)
Enable to Data Valid
Enable to Tristate
SYMBOL
TJIT(PK)
tR
tF
tEN
tTRI
CONDITIONS
MIN
25Mbps
TYP
MAX
250
UNITS
ps
4.5V ≤ VDD_ ≤ 5.5V
1.6
3.0V ≤ VDD_ ≤ 3.6V
2.2
2.25V ≤ VDD_ ≤ 2.75V
3
1.71V ≤ VDD_ ≤ 1.89V
4.5
4.5V ≤ VDD_ ≤ 5.5V
1.4
3.0V ≤ VDD_ ≤ 3.6V
2
2.25V ≤ VDD_ ≤ 2.75V
2.8
1.71V ≤ VDD_ ≤ 1.89V
5.1
ENA to
OUT_,
ENB to
OUT_,
CL = 15pF
4.5V ≤ VDD_ ≤ 5.5V
3.5
3.0V ≤ VDD_ ≤ 3.6V
5.8
2.25V ≤ VDD_ ≤ 2.75V
9.3
1.71V ≤ VDD_ ≤ 1.89V
17.4
ENA to
OUT_,
ENB to
OUT_,
CL = 15pF
4.5V ≤ VDD_ ≤ 5.5V
6.4
3.0V ≤ VDD_ ≤ 3.6V
9.2
2.25V ≤ VDD_ ≤ 2.75V
12.8
1.71V ≤ VDD_ ≤ 1.89V
19.4
ns
ns
ns
ns
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.
Note 2: Not production tested. Guaranteed by design and characterization,
Note 3: All currents into the device are positive. All currents out of the device are negative. All voltages are referenced to their
respective ground (GNDA or GNDB), unless otherwise noted.
Note 4: CMTI is the maximum sustainable common-mode voltage slew rate while maintaining the correct output. CMTI applies to
both rising and falling common-mode voltage edges. Tested with the transient generator connected between GNDA and
GNDB (VCM = 1000V).
ESD Protection
PARAMETER
ESD
www.maximintegrated.com
SYMBOL
CONDITIONS
Human Body Model, All Pins
MIN
TYP
±4
MAX
UNITS
kV
Maxim Integrated │ 9
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Table 1. Insulation Characteristics
PARAMETER
SYMBOL
Partial Discharge Test Voltage
VPR
VALUE
UNITS
Method B1 = VIORM x 1.875
(t = 1s, partial discharge < 5pC)
CONDITIONS
2250
VP
Maximum Repetitive Peak
Isolation Voltage
VIORM
(Note 5)
1200
VP
Maximum Working Isolation
Voltage
VIOWM
Continuous RMS voltage
(Note 5)
848
VRMS
Maximum Transient Isolation
Voltage
VIOTM
t = 1s
8400
VP
Maximum Withstand Isolation
Voltage
VISO
fSW = 60Hz, duration = 60s (Note 6)
5000
VRMS
VIOSM
Basic Insulation, 1.2/50µs pulse per
IEC61000-4-5
10
kV
>1012
Ω
2
pF
8
mm
Maximum Surge Isolation Voltage
Insulation Resistance
RS
VIO = 500V
Barrier Capacitance Side A to
Side B
CIO
fSW = 1MHz (Note 7)
Minimum Creepage Distance
CPG
Minimum Clearance Distance
CLR
Internal Clearance
Comparative Tracking Index
CTI
8
mm
Distance through insulation
0.015
mm
Material Group I (IEC 60112)
>600
Climate Category
40/125/21
Pollution Degree
(DIN VDE 0110, Table 1)
2
Note 5: VISO, VIOWM, and VIORM are defined by the IEC 60747-5-5 standard.
Note 6: Product is qualified at VISO for 60s and 100% production tested at 120% of VISO for 1s.
Note 7: Capacitance is measured with all pins on field-side and logic-side tied together.
VDDA
IN1, IN2
VDDA
0.1µF
0.1µF
VDDA
VDDB
50%
GNDA
VDDB
50%
tPLH
tPHL
VDDB
MAX14434-36
OUT1
50Ω
CL
GNDA
GNDB
RL
VDDB
OUT2
(A)
50%
GNDB
OUT_
IN_
TEST
SOURCE
50%
GNDB
tSCSLH
tSCSHL
90%
50%
50%
10%
tF
tR
(B)
Figure 1. Test Circuit (A) and Timing Diagram (B)
www.maximintegrated.com
Maxim Integrated │ 10
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Characteristics
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
0.7
0.6
VDDA = 1.8V
VDDA = 2.5V
0.5
VDDA = 3.3V
1
5
10
15
20
0
25
VDDA = 2.5V
VDDA = 3.3V
toc04
SUPPLY CURRENT (mA)
VDDA = 1.8V
VDDA = 2.5V
0.5
50
75
100
50
75
0.6
100
125
0.4
150
VDDB = 2.5V
VDDB = 3.3V
VDDB = 5.0V
1
0.6
0
5
10
15
DATA RATE(Mbps)
www.maximintegrated.com
toc05
VDDA = 3.3V
0
5
2.5
5
10
15
20
20
25
toc06
VDDA = 1.8V
VDDA = 2.5V
0.5
VDDA = 3.3V
VDDA = 5.0V
0
25
toc08
0
25
50
75
100
125
SIDE B SUPPLY CURRENT
vs. DATA RATE
12
150
VDDB = 2.5V
VDDB = 3.3V
VDDB = 5.0V
1
toc09
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX14434C/F
10
VDDB = 1.8V
0.6
25
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX14436C/F
1
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX14434B/E
1.4
20
DATA RATE (Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
1.8
15
1.5
VDDA = 5.0V
0
10
SIDE A SUPPLY CURRENT
vs. DATA RATE
2
VDDA = 3.3V
2.2
VDDB = 1.8V
1.4
VDDA = 2.5V
0.5
DATA RATE (Mbps)
VDDA = 2.5V
2.6
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
toc07
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX14434B/E
1.8
VDDA = 1.8V
DATA RATE (Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.2
150
VDDA = 1.8V
DATA RATE (Mbps)
2.6
0.6
SUPPLY CURRENT (mA)
25
125
0.7
0.5
VDDA = 3.3V
0
0.7
VDDA = 5.0V
0.8
VDDA = 5.0V
0
0.8
0.4
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX14436B/E
0.9
1.5
1
25
SIDE A SUPPLY CURRENT
vs. DATA RATE
1
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX14435C/F/S/V
2
0
toc03
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX14435B/E/R/U
DATA RATE (Mbps)
SIDE A SUPPLY CURRENT
vs. DATA RATE
2.5
1
VDDA = 5.0V
DATA RATE(Mbps)
SUPPLY CURRENT (mA)
VDDA = 1.8V
0.5
SIDE A SUPPLY CURRENT
vs. DATA RATE
0.9
1.5
VDDA = 5.0V
0
toc02
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX14434C/F
2
0.8
0.4
2.5
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX14434B/E
0.9
SIDE A SUPPLY CURRENT
vs. DATA RATE
SUPPLY CURRENT (mA)
1
toc01
SUPPLY CURRENT (mA)
SIDE A SUPPLY CURRENT
vs. DATA RATE
VDDB = 1.8V
8
VDDB = 2.5V
VDDB = 3.3V
6
VDDB = 5.0V
4
2
0
5
10
15
DATA RATE(Mbps)
20
25
0
0
25
50
75
100
125
150
DATA RATE(Mbps)
Maxim Integrated │ 11
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Characteristics (continued)
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.)
12
VDDB = 1.8V
8
VDDB = 2.5V
VDDB = 3.3V
6
VDDB = 5.0V
4
1.8
VDDB = 2.5V
VDDB = 3.3V
1.5
VDDB = 5.0V
1.2
0.6
25
50
75
100
125
150
SIDE B SUPPLY CURRENT
vs. DATA RATE
0
5
8
VDDB = 2.5V
VDDB = 3.3V
6
VDDB = 5.0V
4
2
25
50
75
100
125
8
0.6
25
toc16
toc14
VDDB = 5.0V
4
SUPPLY CURRENT (mA)
VDDB = 2.5V
VDDB = 3.3V
1.5
VDDB = 5.0V
1.2
0.9
0
25
50
75
100
125
5
10
15
DATA RATE(Mbps)
www.maximintegrated.com
20
25
20
25
toc15
VDDB = 1.8V
VDDB = 2.5V
VDDB = 3.3V
1.5
VDDB = 5.0V
1.2
0
5
toc17
15
20
SIDE B SUPPLY CURRENT
vs. DATA RATE
12
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX14436C/F
25
VDDB = 2.5V
VDDB = 3.3V
VDDB = 5.0V
4
toc18
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX14436C/F
10
VDDB = 1.8V
6
10
DATA RATE(Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
8
0
15
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX14436B/E
1.8
0.6
150
2
0
10
0.9
10
VDDB = 1.8V
1.8
5
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.4
2.1
VDDB = 3.3V
12
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX14436B/E
2.1
0
DATA RATE(Mbps)
VDDB = 2.5V
6
0
150
VDDB = 5.0V
DATA RATE(Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.4
SUPPLY CURRENT (mA)
20
VDDB = 1.8V
DATA RATE(Mbps)
0.6
15
2
0
VDDB = 3.3V
1.2
SUPPLY CURRENT (mA)
0
VDDB = 2.5V
1.5
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX14435C/F/S/V
10
VDDB = 1.8V
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
10
10
SIDE B SUPPLY CURRENT
vs. DATA RATE
12
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX14435C/F/S/V
VDDB = 1.8V
1.8
DATA RATE(Mbps)
toc13
toc12
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX14435B/E/R/U
0.9
DATA RATE(Mbps)
12
2.4
SUPPLY CURRENT (mA)
0
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.1
VDDB = 1.8V
0.9
2
0
toc11
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX14435B/E/R/U
2.1
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
10
2.4
toc10
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX14434C/F
SIDE B SUPPLY CURRENT
vs. DATA RATE
SUPPLY CURRENT (mA)
SIDE B SUPPLY CURRENT
vs. DATA RATE
VDDB = 1.8V
8
VDDB = 2.5V
VDDB = 3.3V
6
VDDB = 5.0V
4
2
0
25
50
75
100
DATA RATE(Mbps)
125
150
0
0
25
50
75
100
125
150
DATA RATE(Mbps)
Maxim Integrated │ 12
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Characteristics (continued)
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.)
40
PROPAGATION DELAY (ns)
25
VDDA = 1.8V
VDDA = 2.5V
20
VDDA = 3.3V
VDDA = 5.0V
-50
-25
0
25
50
75
100
125
VDDA = 1.8V
VDDA = 2.5V
3
VDDA = 5.0V
-25
25
50
100
MAX1443_C/F/S/V
10
0
125
1.5
2.5
3.5
4.5
MINIMUM PULSE WIDTH
toc25
toc24
MAX1443_B/E/R/U
40ns PULSE
MAX1443_C/F/S/V
5ns PULSE
MAX1443_B/E/R/U
5.5
VDDA VOLTAGE (V)
MINIMUM PULSE WIDTH
toc22
VDDA = 3.3V
INA TO OUTB, tPLH
20
75
MAX1443_B/E/R/U
15
TEMPERATURE (⁰C)
PROPAGATION DELAY
vs. VDDB VOLTAGE
25
PROPAGATION DELAY (ns)
0
20
5
VDDA = 3.3V
-50
toc21
VDDB = 3.3V
INA TO OUTB, tPLH
25
6
0
PROPAGATION DELAY
vs. VDDA VOLTAGE
30
9
TEMPERATURE (⁰C)
30
toc20
VDDA = VDDB
INA TO OUTB, tPLH
MAX1443_C/F/S/V
12
30
15
PROPAGATION DELAY
vs. TEMPERATURE
15
VDDA = VDDB
INA TO OUTB, tPLH
MAX1443_B/E/R/U
35
PROPAGATION DELAY (ns)
toc19
PROPAGATION DELAY (ns)
PROPAGATION DELAY
vs. TEMPERATURE
IN_
1V/div
OUT_
1V/div
IN_
1V/div
15
MAX1443_C/F/S/V
10
5
0
1.5
2.5
3.5
4.5
5.5
OUT_
5ns/div
1V/div
20ns/div
VDDB VOLTAGE (V)
EYE DIAGRAM at 200Mbps
MAX1443_C/F/S/V
CLOCK JITTER RMS ON RISING EDGE
MAX1443_C/F/S/V
toc23
CLOCK JITTER RMS ON FALLING EDGE
MAX1443_C/F/S/V
toc26
VDDB = 3.6V
toc27
500kHz Clock Input
tJCLK(RMS) = 6.5ps
500kHz Clock Input
tJCLK(RMS) = 6.3ps
600mV/div
1ns/div
www.maximintegrated.com
OUT_
400mV/div
125ps/div
OUT_
400mV/div
125ps/div
Maxim Integrated │ 13
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Pin Configurations
TOP VIEW
VDDA
1
GNDA
2
IN1
+
16 VDDB
MAX 14434
VDDA
1
+
16
MAX14435B/C/E/F
VDDB
15 GNDB
GNDA
2
3
14 OUT1
IN1
3
14 OUT1
IN2
4
13 OUT2
IN2
4
13 OUT2
IN3
5
12 OUT3
IN3
5
12 OUT3
IN4
6
11 OUT4
OUT4
6
11 IN4
IC
7
10 ENB
ENA
7
10 ENB
GNDA
8
9
GNDA
8
9
GNDB
SOIC
VDDA
1
GNDA
2
IN1
+
15 GNDB
GNDB
SOIC
+
16 VDDB
VDDA
1
15 GNDB
GNDA
2
3
14 OUT1
IN1
3
14 OUT1
IN2
4
13 OUT2
IN2
4
13 OUT2
IN3
5
12 OUT3
OUT3
5
12 IN3
OUT4
6
11 IN4
OUT4
6
11 IN4
ENA
7
10 ENB
ENA
7
10 ENB
GNDA
8
9
GNDA
8
9
MAX14435R/S/U/V
SOIC
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GNDB
MAX 14436
16 VDDB
15 GNDB
GNDB
SOIC
Maxim Integrated │ 14
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Pin Description
NAME
PIN
FUNCTION
MAX14434
MAX14435B/C/E/F
MAX14435R/S/U/V
MAX14436
VDDA
1
1
1
1
GNDA
2, 8
2, 8
2, 8
2, 8
IN1
3
3
3
3
Logic Input 1 on Side A, corresponds to Logic
Output 1 on Side B
IN2
4
4
4
4
Logic Input 2 on Side A, corresponds to Logic
Output 2 on Side B
IN3
5
5
5
12
Logic Input 3 on Side A or B, corresponds to
Logic Output 3 on Side B or A
IN4
6
11
11
11
Logic Input 4 on Side A or B, corresponds to
Logic Output 4 on Side B or A
I.C.
7
—
—
—
Internally Connected. Leave unconnected or
connect to GNDA or VDDA.
ENA
—
7
—
7
Active-High Enable for Side A. ENA has an
internal 5μA pullup to VDDA.
ENA
—
—
7
—
Active-Low Enable for Side A. ENA has an
internal 5μA pullup to VDDA
OUT1
14
14
14
14
Logic Output 1 on Side B
OUT2
13
13
13
13
Logic Output 2 on Side B
OUT3
12
12
12
5
Logic Output 3 on Side A or Side B
OUT4
11
6
6
6
Logic Output 4 on Side A or Side B
ENB
10
10
10
10
Active-High Enable for Side B. ENB has an
internal 5μA pullup to VDDB.
GNDB
9, 15
9, 15
9, 15
9, 15
VDDB
16
16
16
16
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Power Supply. Bypass VDDA with a 0.1µF
ceramic capacitor as close as possible to the pin.
Ground Reference for Side A
Ground Reference for Side B
Power Supply. Bypass VDDB with a 0.1µF
ceramic capacitor as close as possible to the
pin.
Maxim Integrated │ 15
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Functional Diagram
VDDB
VDDA
MAX 14434
VDDA
MAX14435B/C/E/F
ENB
ENB
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
VDDB
IN1
OUT1
IN2
OUT2
IN3
OUT3
OUT4
IN4
ENA
GNDA
VDDA
MAX 14436
GNDB
GNDA
VDDB
VDDA
OUT1
IN2
OUT2
OUT1
IN2
OUT2
OUT3
IN3
IN3
OUT4
IN4
OUT4
IN4
ENA
ENA
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VDDB
IN1
OUT3
GNDA
MAX 14435 R/S/U/V
ENB
ENB
IN1
GNDB
GNDB
GNDA
GNDB
Maxim Integrated │ 16
MAX14434–MAX14436
Detailed Description
The MAX14434–MAX14436 is a family of 4-channel digital
isolators. The MAX14434–MAX14436 have an isolation
rating of 5kVRMS. The MAX14434–MAX14436 family
offers all three possible unidirectional channel configurations to accommodate any 4-channel design, including
SPI, RS-232, RS-485, and digital I/O applications. For applications requiring bidirectional channels, such as I2C, see
the MAX14933 and MAX14937.
The MAX14434 features four channels transferring digital
signals in one direction for applications such as isolated
digital I/O. The MAX14435 has three channels transmitting
data in one direction and one channel transmitting in the
opposite direction, making it ideal for applications such as
isolated SPI and RS-485 communication. The MAX14436
provides further design flexibility with two channels in each
direction for isolated RS-232 or other applications.
Devices are available in the 16-pin wide-body SOIC
package and are rated for up to 5kVRMS. This
family of digital isolators offers low-power operation, high
electromagnetic interference (EMI) immunity, and stable
temperature performance through Maxim’s proprietary
process technology. The devices isolate different ground
domains and block high-voltage/high-current transients
from sensitive or human interface circuitry.
Devices are available with a maximum data rate of either
25Mbps (B/E/R/U versions) or 200Mbps (C/F/S/V versions).
Each device can be ordered with default-high or defaultlow outputs. The default is the state the output assumes
when the input is not powered or if the input is open circuit.
The devices have two supply inputs (VDDA and VDDB)
that independently set the logic levels on either side of
the device. VDDA and VDDB are referenced to GNDA and
GNDB, respectively. The MAX14434–MAX14436 family
also features a refresh circuit to ensure output accuracy
when an input remains in the same state indefinitely.
www.maximintegrated.com
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Digital Isolation
The MAX14434–MAX14436 family provides galvanic isolation for digital signals that are transmitted between two
ground domains. The devices withstand differences of up
to 5kVRMS for up to 60 seconds, and up to 1200VPEAK
of continuous isolation.
Level-Shifting
The wide supply voltage range of both VDDA and VDDB
allows the MAX14434–MAX14436 family to be used for
level translation in addition to isolation. VDDA and VDDB
can be independently set to any voltage from 1.71V to
5.5V. The supply voltage sets the logic level on the corresponding side of the isolator.
Unidirectional Channels
Each channel of the MAX14434–MAX14436 is unidirectional;
it only passes data in one direction, as indicated in the
functional diagram. Each device features four unidirectional
channels that operate independently with guaranteed data
rates from DC up to 25Mbps (B/E/R/U versions), or from
DC to 200Mbps (C/F/S/V versions). The output driver of each
channel is push-pull, eliminating the need for pullup
resistors. The outputs are able to drive both TTL and
CMOS logic inputs.
Startup and Undervoltage-Lockout
The VDDA and VDDB supplies are both internally monitored
for undervoltage conditions. Undervoltage events can occur
during power-up, power-down, or during normal operation
due to a sagging supply voltage. When an undervoltage
condition is detected on either supply while the outputs
are enabled, all outputs go to their default states regardless of
the state of the inputs (Table 2). Figure 2 through Figure
5 show the behavior of the outputs during power-up and
power-down.
Maxim Integrated │ 17
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Table 2. Output Behavior During Undervoltage Conditions
VIN_
VDDA
VDDB
1
Powered
Powered
0
Powered
Powered
X
Undervoltage
Powered
X
Powered
Undervoltage
ENA
ENB
VOUTA
VOUTB
1
1
1
1
0
0
Hi-Z
Hi-Z
1
1
0
0
0
0
Hi-Z
Hi-Z
1
1
Default
Default
0
0
Hi-Z
Hi-Z
1
1
Default
Default
0
0
Hi-Z
Hi-Z
Figure 2. Undervoltage Lockout Behavior (MAX1443_B/C/R/S High)
Figure 3. Undervoltage Lockout Behavior (MAX1443_E/F/U/V High)
Figure 4. Undervoltage Lockout Behavior (MAX1443_B/C/R/S Low)
Figure 5. Undervoltage Lockout Behavior (MAX1443_E/F/U/V Low)
www.maximintegrated.com
Maxim Integrated │ 18
MAX14434–MAX14436
Applications Information
Power-Supply Sequencing
The MAX14434–MAX14436 do not require special power
supply sequencing. The logic levels are set independently
on either side by VDDA and VDDB. Each supply can be
present over the entire specified range regardless of the
level or presence of the other supply.
Power-Supply Decoupling
To reduce ripple and the chance of introducing data
errors, bypass VDDA and VDDB with 0.1μF low-ESR
ceramic capacitors to GNDA and GNDB, respectively.
Place the bypass capacitors as close to the power supply
input pins as possible.
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Layout Considerations
The PCB designer should follow some critical recommendations in order to get the best performance from the
design.
●● Keep the input/output traces as short as possible.
Avoid using vias to make low-inductance paths for
the signals.
●● Have a solid ground plane underneath the highspeed signal layer.
●● Keep the area underneath the MAX14434–MAX14436
free from ground and signal planes. Any galvanic or
metallic connection between the field-side and logicside defeats the isolation.
.0
Figure 6. Supply Current Per Input Channel (Estimated)
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Figure 7. Supply Current Per Output Channel (Estimated)
Maxim Integrated │ 19
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Calculating Power Dissipation
Example (shown in Figure 8): A MAX14435F is operating
with VDDA = 2.5V, VDDB = 3.3V, channel 1 operating at
20Mbps with a 10pF capacitive load, channel 2 held high
with a 10kΩ resistive load, and channel 4 operating at
100Mbps with a 15pF capacitive load. Channel 3 is not in
use and the resistive load is negligible since the isolator
is driving a CMOS input. Refer to Table 3 and Table 4 for
VDDA and VDDB supply current calculation worksheets.
The required current for a given supply (VDDA or VDDB)
can be estimated by summing the current required for
each channel. The supply current for a channel depends
on whether the channel is an input or an output, the channel’s
data rate, and the capacitive or resistive load if it is an
output. The typical current for an input or output at any
data rate can be estimated from the graphs in Figure 6
and Figure 7. Please note the data in Figure 6 and Figure
7 are extrapolated from the supply current measurements
in a typical operating condition.
VDDA must supply:
●● Channel 1 is an input channel operating at 2.5V and
20Mbps, consuming 0.33mA, estimated from Figure 6.
The total current for a single channel is the sum of the
“no load” current (shown in Figure 6 and Figure 7) which
is a function of Voltage and Data Rate, and the “load
current,” which depends on the type of load. Current into
a capacitive load is a function of the load capacitance, the
switching frequency, and the supply voltage.
●● Channel 2 and 3 are input channels operating at
2.5V with DC signal, consuming 0.13mA, estimated
from Figure 6.
●● Channel 4 is an output channel operating at 2.5V and
100Mbps, consuming 1.02mA, estimated from Figure 7.
●● ICL on channel 4 for 15pF capacitor at 2.5V and
100Mbps is 1.875mA.
ICL = CL × fSW × VDD
where
Total current for side A = 0.33 + 0.13 × 2 + 1.02 +
1.875 = 3.485mA, typical
ICL is the current required to drive the capacitive load.
CL is the load capacitance on the isolator’s output pin.
VDDB must supply:
fSW is the switching frequency (bits per second / 2).
●● Channel 1 is an output channel operating at 3.3V and
20Mbps, consuming 0.42mA, estimated from Figure 7.
VDD is the supply voltage on the output side of the isolator.
Current into a resistive load depends on the load resistance,
the supply voltage and the average duty cycle of the data
waveform. The DC load current can be conservatively
estimated by assuming the output is always high.
●● Channel 2 and 3 are output channels operating at
3.3V with DC signal, consuming 0.18mA, estimated
from Figure 7.
●● Channel 4 is an input channel operating at 3.3V and
100Mbps, consuming 1.13mA, estimated from Figure 6.
IRL = VDD ÷ RL
where
●● ICL on channel 1 for 10pF capacitor at 3.3V and
20Mbps is 0.33mA.
IRL is the current required to drive the resistive load.
●● IRL on channel 2 for 10kΩ resistor held at 3.3V is
0.33mA.
VDD is the supply voltage on the output side of the isolator.
RL is the load resistance on the isolator’s output pin.
Total current for side B = 0.42 + 0.18 × 2 + 1.13 + 0.33
+ 0.33 = 2.57mA, typical
Table 3. Side A Supply Current Calculation Worksheet
SIDE A
V DDA = 2.5V
Channel
IN/
OUT
Data Rate
(Mbps)
1
IN
20
0.33
2
IN
0
0.13
3
IN
0
4
OUT
100
Load Type
Load
“No Load” Current
(mA)
Load Current
(mA)
0.13
Capacitive
15pF
1.02
2.5V x 50MHz x 15pF = 1.875mA
Total: 3.485mA
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Maxim Integrated │ 20
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Table 4. Side B Supply Current Calculation Worksheet
SIDE B
V DDB = 3.3V
Channel
IN/
OUT
Data Rate
(Mbps)
Load Type
Load
“No Load” Current
(mA)
Load Current
(mA)
1
OUT
20
2
OUT
0
Capacitive
10pF
0.42
3.3V x 10MHz x 10pF = 0.33mA
Resistive
10kΩ
0.18
3
OUT
0
3.3V / 10kΩ = 0.33mA
4
IN
100
0.18
1.13
Total: 2.57mA
2.5V
3.3V
VDDB
VDDA
MAX14435F
ENB
20Mbps
20Mbps
IN1
OUT1
10pF
2.5V
IN2
OUT2
10kΩ
IN3
OUT3
100Mbps
100Mbps
OUT4
IN4
15pF
ENA
GNDA
GNDB
Figure 8. Example Circuit for Supply Current Calculation
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Maxim Integrated │ 21
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Circuit
2.5V
3.3V
V DDA
0.1µF
V DDB
0.1µF
MAX14435R/S/U/V
ENB
CS
IN1
OUT1
CS
SCLK
OUT2
IN2
Micro controller
SCLK
MOSI
ADC
MISO
MOSI
MISO
IN3
OUT3
OUT4
IN4
ENA
GNDB
GNDA
ISOLATED SPI INTERFACE
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Maxim Integrated │ 22
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Circuit (continued)
3.3V
24V
5V
V DDB
V DDA
MAX 14434
0.1µF
0.1µF
5V V OUT
ENB
GPIO
PORT
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
GNDA
GNDB
3.3V
24V DIGITAL I /O
WITH
5V INTERFACE
5V
V DDB
0.1µF
V DDA
MAX 14434
0.1µF
ENB
OUT1
IN1
OUT2
IN2
OUT3
IN3
OUT4
IN4
GNDA
GNDB
INDUSTRIAL I/O
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Maxim Integrated │ 23
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Circuit (continued)
2.5V
5V
V DDA
0.1µF
MAX 14436
V DDB
ENB
IN1
OUT1
IN2
OUT2
Micro controller
0.1µF
T1IN
T2IN
MAX 13223
RS-232 Transceiver
OUT3
IN3
OUT4
IN4
R1OUT
R2OUT
ENA
GNDA
GNDB
ISOLATED RS-232
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Maxim Integrated │ 24
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Ordering Information
CHANNEL
CONFIGURATION
DATA
RATE
(Mbps)
DEFAULT
OUTPUT
ENA
Polarity
ISOLATION
VOLTAGE
(kVRMS)
TEMP
RANGE
(°C)
MAX14434BAWE+*
4/0
25
Default High
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14434CAWE+*
4/0
200
Default High
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14434EAWE+*
4/0
25
Default Low
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14434FAWE+
4/0
200
Default Low
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14435BAWE+*
3/1
25
Default High
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14435CAWE+*
3/1
200
Default High
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14435EAWE+*
3/1
25
Default Low
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14435FAWE+
3/1
200
Default Low
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14435RAWE+*
3/1
25
Default High
Active-Low
5.0
-40 to +125
16 Wide SOIC
MAX14435SAWE+*
3/1
200
Default High
Active-Low
5.0
-40 to +125
16 Wide SOIC
MAX14435UAWE+*
3/1
25
Default Low
Active-Low
5.0
-40 to +125
16 Wide SOIC
MAX14435VAWE+*
3/1
200
Default Low
Active-Low
5.0
-40 to +125
16 Wide SOIC
MAX14436BAWE+*
2/2
25
Default High
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14436CAWE+*
2/2
200
Default High
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14436EAWE+*
2/2
25
Default Low
Active-High
5.0
-40 to +125
16 Wide SOIC
MAX14436FAWE+
2/2
200
Default Low
Active-High
5.0
-40 to +125
16 Wide SOIC
PART
PIN-PACKAGE
*Future Product—Contact Maxim for availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
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Maxim Integrated │ 25
MAX14434–MAX14436
Four-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
6/17
Initial release
—
1
8/17
Updated Insulation Characteristics table
10
2
1/18
Updated Ordering Information table
25
3
1/19
Removed future product designation from MAX14434FAWE+ in the Ordering
Information table
24
DESCRIPTION
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. │ 26
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