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MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
General Description
The MAX22344–MAX22346 are reinforced, fast, lowpower 4-channel digital galvanic isolators using Maxim’s
proprietary process technology. These devices transfer
digital signals between circuits with different power
domains, using as little as 0.74mW per channel at 1Mbps
(1.8V supply). All of the devices in the family feature
reinforced isolation for a withstand voltage rating of
3.75kVRMS for 60 seconds.
The MAX22344–MAX22346 family offers all possible
unidirectional channel configurations to accommodate
any 4-channel design, including SPI, RS-485, and digital
I/O applications. Output enable for the A side of the
MAX22345R/S is active-low, 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 output
enables in the MAX22344–MAX22346 family are the
traditional active-high.
Devices are available with a maximum data rate of either
25Mbps or 200Mbps, and feature a selectable default state
for the outputs. The default is the state the output assumes
when the input is either not powered or is open-circuit. See
the Ordering Information and Product Selector Guide 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.
All of the devices in the MAX22344–MAX22346 family are
available in a 20-pin SSOP package with 5.5mm of creepage and
clearance. All devices are rated for operation at ambient
temperatures of -40°C to +125°C.
Benefits and Features
●● Reinforced Galvanic Isolation for Fast Digital Signals
• Up to 200Mbps Maximum Data Rate
• Withstands 3.75kVRMS for 60s (VISO)
• Continuously Withstands 784VRMS (VIOWM)
• Withstands ±10kV Surge between GNDA and
GNDB with 1.2/50μs waveform
• High CMTI (50kV/μs, Typical)
●● Low Power Consumption
• 0.74mW per Channel at 1Mbps with VDD = 1.8V
• 1.4mW per Channel at 1Mbps with VDD = 3.3V
• 3.2mW per Channel at 100Mbps with VDD = 1.8V
●● Options to Support a Broad Range of Applications
• 2 Maximum Data Rates (200Mbps, 25Mbps)
• 3 Direction Configurations
• Active-High or Active-Low Enable Inputs
• Pin-Selectable Output Default States (High/Low)
Applications
●●
●●
●●
●●
Isolated SPI Interface
Fieldbus Communications for Industrial Automation
Isolated RS-485/RS-422, CAN
Battery Management
●● Medical Systems
Safety Regulatory Approvals (Pending)
●● UL According to UL1577
●● cUL According to CSA Bulletin 5A
●● VDE 0884-11 Reinforced Isolation
Ordering Information and Product Selector Guide appear at
end of data sheet.
19-100265; Rev 3; 3/19
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Absolute Maximum Ratings
VDDA to GNDA.........................................................-0.3V to +6V
VDDB to GNDB.........................................................-0.3V to +6V
IN_ on Side A, ENA, ENA, DEFA to GNDA.............-0.3V to +6V
IN_ on Side B, ENB, DEFB 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 Continuous Current
OUT_ on Side A to GNDA,
OUT_ on Side B to GNDB.............................................±30mA
Continuous Power Dissipation (TA = +70°C)
SSOP (derate 8mW/°C above +70°C)......................952.4mW
Operating Temperature Range.......................... -40°C to +125°C
Maximum Junction Temperature......................................+150°C
Storage Temperature Range............................. -60°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°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: 20 SSOP
Package Code
A20MS+7
Outline Number
21-0056
Land Pattern Number
90-0094
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
84°C/W
Junction to Case (θJC)
32°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.
www.maximintegrated.com
Maxim Integrated │ 2
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
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.) (Notes 1, 3)
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
IDDA
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
500kHz square
wave, CL = 0pF
Side B Supply Current
(MAX22344_)
(Note 2)
IDDB
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
www.maximintegrated.com
1.66
V
mV
45
500kHz square
wave, CL = 0pF
Side A Supply Current
(MAX22344_)
(Note 2)
1.6
V
VDDA = 5V
0.54
1.00
VDDA = 3.3V
0.53
0.97
VDDA = 2.5V
0.52
0.96
VDDA = 1.8V
0.50
0.68
VDDA = 5V
1.67
2.50
VDDA = 3.3V
1.64
2.43
VDDA = 2.5V
1.62
2.41
VDDA = 1.8V
1.58
2.07
VDDA = 5V
4.63
6.31
VDDA = 3.3V
4.53
6.17
VDDA = 2.5V
4.48
6.11
VDDA = 1.8V
4.34
5.60
VDDB = 5V
1.19
2.06
VDDB = 3.3V
1.17
2.02
VDDB = 2.5V
1.17
2.01
VDDB = 1.8V
1.14
1.92
VDDB = 5V
2.28
3.29
VDDB = 3.3V
1.85
2.79
VDDB = 2.5V
1.68
2.58
VDDB = 1.8V
1.51
2.33
VDDB = 5V
5.66
7.07
VDDB = 3.3V
3.98
5.16
VDDB = 2.5V
3.28
4.34
VDDB = 1.8V
2.69
3.59
mA
mA
Maxim Integrated │ 3
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS 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.) (Notes 1, 3)
PARAMETER
SYMBOL
CONDITIONS
500kHz square
wave, CL = 0pF
Side A Supply Current
(MAX22345_)
(Note 2)
IDDA
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
500kHz square
wave, CL = 0pF
Side B Supply Current
(MAX22345_)
(Note 2)
IDDB
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
500kHz square
wave, CL = 0pF
Side A Supply Current
(MAX22346_)
(Note 2)
IDDA
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
www.maximintegrated.com
TYP
MAX
VDDA = 5V
MIN
0.70
1.26
VDDA = 3.3V
0.69
1.23
VDDA = 2.5V
0.68
1.22
VDDA = 1.8V
0.66
0.99
VDDA = 5V
1.83
2.70
VDDA = 3.3V
1.70
2.53
VDDA = 2.5V
1.63
2.45
VDDA = 1.8V
1.56
2.14
VDDA = 5V
4.89
6.51
VDDA = 3.3V
4.39
5.93
VDDA = 2.5V
4.18
5.67
VDDA = 1.8V
3.93
5.11
VDDB = 5V
1.03
1.80
VDDB = 3.3V
1.01
1.76
VDDB = 2.5V
1.01
1.75
VDDB = 1.8V
0.98
1.61
VDDB = 5V
2.13
3.09
VDDB = 3.3V
1.80
2.70
VDDB = 2.5V
1.66
2.54
VDDB = 1.8V
1.53
2.27
VDDB = 5V
5.41
6.88
VDDB = 3.3V
4.11
5.41
VDDB = 2.5V
3.58
4.78
VDDB = 1.8V
3.11
4.11
VDDA = 5V
0.87
1.53
VDDA = 3.3V
0.85
1.49
VDDA = 2.5V
0.84
1.49
VDDA = 1.8V
0.82
1.30
VDDA = 5V
1.98
2.89
VDDA = 3.3V
1.75
2.61
VDDA = 2.5V
1.65
2.49
VDDA = 1.8V
1.55
2.20
VDDA = 5V
5.15
6.69
VDDA = 3.3V
4.25
5.66
VDDA = 2.5V
3.88
5.22
VDDA = 1.8V
3.52
4.60
UNITS
mA
mA
mA
Maxim Integrated │ 4
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS 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.) (Notes 1, 3)
PARAMETER
SYMBOL
CONDITIONS
500kHz square
wave, CL = 0pF
Side B Supply Current
(MAX22346_)
(Note 2)
IDDB
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
LOGIC INTERFACE (IN_, EN_, ENA, DEF_, OUT_)
TYP
MAX
VDDB = 5V
0.87
1.53
VDDB = 3.3V
0.85
1.49
VDDB = 2.5V
0.84
1.49
VDDB = 1.8V
0.82
1.30
VDDB = 5V
1.98
2.89
VDDB = 3.3V
1.75
2.61
VDDB = 2.5V
1.65
2.49
VDDB = 1.8V
1.55
2.20
VDDB = 5V
5.15
6.69
VDDB = 3.3V
4.25
5.66
VDDB = 2.5V
3.88
5.22
VDDB = 1.8V
3.52
4.60
2.25V ≤ VDD_ ≤ 5.5V
0.7 x
VDD_
1.71V ≤ VDD_ < 2.25V
0.75 x
VDD_
2.25V ≤ VDD_ ≤ 5.5V
0.7 x
VDD_
1.71V ≤ VDD_ < 2.25V
0.75 x
VDD_
EN_, ENA, IN_
Input High Voltage
VIH
DEF_ (Note 2)
www.maximintegrated.com
MIN
UNITS
mA
V
Maxim Integrated │ 5
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS 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.) (Notes 1, 3)
PARAMETER
SYMBOL
CONDITIONS
EN_, ENA, IN_
Input Low Voltage
VIL
DEF_ (Note 2)
Input Hysteresis
VHYS
EN_, ENA,
DEF_, IN_
MIN
TYP
MAX
2.25V ≤ VDD_ ≤ 5.5V
0.8
1.71V ≤ VDD_ < 2.25V
0.7
2.25V ≤ VDD_ ≤ 5.5V
0.8
1.71V ≤ VDD_ < 2.25V
UNITS
V
0.7
MAX2234_B/R
410
MAX2234_C/S
80
mV
IN_ Input Pullup Current
IPU
DEFA = DEFB = high
-10
-5
-1.5
µA
IN_ Input Pulldown Current
IPD
DEFA = DEFB = low
1.5
5
10
µA
IN_ Input Capacitance
CIN
fSW = 1MHz
ENA Pullup Current
IPU_ENA
ENB Pullup Current
IPU_ENB
ENA Pulldown Current
IPD_EN
DEF_ Pullup Current
IPU_DEF
MAX2234_B/C
MAX22345R/S
OUT_ Output Voltage High
VOH
IOUT_ = -4mA source
OUT_ Output Voltage Low
VOL
IOUT_ = 4mA sink
www.maximintegrated.com
2
pF
-10
-5
-1.5
µA
-10
-5
-1.5
μA
1.5
5
10
µA
-10
-5
-1.5
µA
VDD_
- 0.4
V
0.4
V
Maxim Integrated │ 6
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Dynamic Characteristics MAX2234_C/S
(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.) (Notes 2, 4)
PARAMETER
Common-Mode Transient
Immunity
SYMBOL
CMTI
Maximum Data Rate
DRMAX
Minimum Pulse Width
PWMIN
tPLH
Propagation Delay
(Figure 3)
tPHL
Pulse Width Distortion
PWD
tSPLH
Propagation Delay Skew
Part-to-Part (Same Channel)
tSPHL
Propagation Delay Skew
Channel-to-Channel
(Same Direction)
www.maximintegrated.com
CONDITIONS
MIN
IN_ = GND_ or VDD_ (Note 5)
200
1.71V ≤ VDD_ < 2.25V
150
IN_ to
OUT_,
CL = 15pF
IN_ to
OUT_,
CL = 15pF
|tPLH - tPHL|
MAX
50
2.25V ≤ VDD_ ≤ 5.5V
IN_ to
OUT_
TYP
UNITS
kV/µs
Mbps
2.25V ≤ VDD_ ≤ 5.5V
5.00
1.71V ≤ VDD_ < 2.25V
6.67
4.5V ≤ VDD_ ≤ 5.5V
4.1
5.7
9.2
3.0V ≤ VDD_ ≤ 3.6V
4.2
6.5
10.2
2.25V ≤ VDD_ ≤ 2.75V
4.9
7.9
13.4
1.71V ≤ VDD_ ≤ 1.89V
7.1
12.0
20.3
4.5V ≤ VDD_ ≤ 5.5V
4.3
6.1
9.4
3.0V ≤ VDD_ ≤ 3.6V
4.4
6.9
10.5
2.25V ≤ VDD_ ≤ 2.75V
5.1
8.2
14.1
1.71V ≤ VDD_ ≤ 1.89V
7.2
12.1
21.7
4.5V ≤ VDD_ ≤ 5.5V
0.4
2.0
3.0V ≤ VDD_ ≤ 3.6V
0.4
2.0
2.25V ≤ VDD_ ≤ 2.75V
0.3
2.0
1.71V ≤ VDD_ ≤ 1.89V
0.0
2.0
4.5V ≤ VDD_ ≤ 5.5V
3.7
3.0V ≤ VDD_ ≤ 3.6V
4.3
2.25V ≤ VDD_ ≤ 2.75V
6.0
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
2.0
tSCSHL
1.71V ≤ VDD_ ≤ 5.5V
2.0
ns
ns
ns
ns
ns
Maxim Integrated │ 7
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Dynamic Characteristics MAX2234_C/S (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.) (Notes 2, 4)
PARAMETER
SYMBOL
tSCOLH
Propagation Delay Skew
Channel-to-Channel
(Opposite Direction)
tSCOHL
Peak Eye Diagram Jitter
Clock Jitter RMS
Rise Time
(Figure 3)
Fall Time
(Figure 3)
Enable to Data Valid
(Figure 4)
Enable to Tristate
(Figure 4)
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
200Mbps
100
500kHz clock input, rising/falling edges
7.5
ps
0.8
3.0V ≤ VDD_ ≤ 3.6V
1.1
2.25V ≤ VDD_ ≤ 2.75V
1.5
1.71V ≤ VDD_ ≤ 1.89V
2.4
4.5V ≤ VDD_ ≤ 5.5V
1.0
3.0V ≤ VDD_ ≤ 3.6V
1.4
2.25V ≤ VDD_ ≤ 2.75V
1.9
1.71V ≤ VDD_ ≤ 1.89V
3.0
ENA to
OUT_,
EN_ to
OUT_,
CL = 15pF
4.5V ≤ VDD_ ≤ 5.5V
3.9
ENA to
OUT_,
EN_ to
OUT_,
CL = 15pF
CL = 5pF
ns
ps
4.5V ≤ VDD_ ≤ 5.5V
CL = 5pF
UNITS
3.0V ≤ VDD_ ≤ 3.6V
6.4
2.25V ≤ VDD_ ≤ 2.75V
10.1
1.71V ≤ VDD_ ≤ 1.89V
18.4
4.5V ≤ VDD_ ≤ 5.5V
6.3
3.0V ≤ VDD_ ≤ 3.6V
9.0
2.25V ≤ VDD_ ≤ 2.75V
12.6
1.71V ≤ VDD_ ≤ 1.89V
19.2
ns
ns
ns
ns
Maxim Integrated │ 8
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Dynamic Characteristics MAX2234_B/R
(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.) (Notes 2, 4)
PARAMETER
Common-Mode Transient
Immunity
SYMBOL
CMTI
Maximum Data Rate
DRMAX
Minimum Pulse Width
PWMIN
Glitch Rejection
Propagation Delay
(Figure 3)
tPHL
PWD
MAX
50
25
Mbps
IN_ to OUT_
IN_ to
OUT_,
CL = 15pF
IN_ to
OUT_,
CL = 15pF
|tPLH - tPHL|
40
ns
ns
10
17
29
4.5V ≤ VDD_ ≤ 5.5V
17.4
24.2
32.5
3.0V ≤ VDD_ ≤ 3.6V
17.6
25.0
33.7
2.25V ≤ VDD_ ≤ 2.75V
18.3
26.4
36.7
1.71V ≤ VDD_ ≤ 1.89V
20.7
30.6
43.5
4.5V ≤ VDD_ ≤ 5.5V
16.9
24.0
33.6
3.0V ≤ VDD_ ≤ 3.6V
17.2
24.8
35.1
2.25V ≤ VDD_ ≤ 2.75V
17.8
26.1
38.2
1.71V ≤ VDD_ ≤ 1.89V
19.8
30.0
45.8
4.5V ≤ VDD_ ≤ 5.5V
0.2
4.0
3.0V ≤ VDD_ ≤ 3.6V
0.2
4.0
2.25V ≤ VDD_ ≤ 2.75V
0.3
4.0
1.71V ≤ VDD_ ≤ 1.89V
0.6
4.0
15.1
15.0
2.25V ≤ VDD_ ≤ 2.75V
15.4
1.71V ≤ VDD_ ≤ 1.89V
20.5
4.5V ≤ VDD_ ≤ 5.5V
13.9
3.0V ≤ VDD_ ≤ 3.6V
14.2
2.25V ≤ VDD_ ≤ 2.75V
16.0
1.71V ≤ VDD_ ≤ 1.89V
21.8
tSCSLH
1.71V ≤ VDD_ ≤ 5.5V
2.0
tSCSHL
1.71V ≤ VDD_ ≤ 5.5V
2.0
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
4.5V ≤ VDD_ ≤ 5.5V
13.0
3.0V ≤ VDD_ ≤ 3.6V
12.9
2.25V ≤ VDD_ ≤ 2.75V
14.4
1.71V ≤ VDD_ ≤ 1.89V
20.1
tSPHL
tSCOLH
Propagation Delay Skew
Channel-to-Channel
(Opposite Direction)
tSCOHL
UNITS
kV/µs
3.0V ≤ VDD_ ≤ 3.6V
Propagation Delay Skew
Part-to-Part (Same Channel)
www.maximintegrated.com
TYP
4.5V ≤ VDD_ ≤ 5.5V
tSPLH
Propagation Delay Skew
Channel-to-Channel
(Same Direction)
MIN
IN_ = GND_ or VDD_ (Note 5)
IN_ to OUT_
tPLH
Pulse Width Distortion
CONDITIONS
ns
ns
ns
ns
ns
Maxim Integrated │ 9
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Dynamic Characteristics MAX2234_B/R (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.) (Notes 2, 4)
PARAMETER
Peak Eye Diagram Jitter
Rise Time
(Figure 3)
Fall Time
(Figure 3)
Enable to Data Valid
(Figure 4)
Enable to Tristate
(Figure 4)
SYMBOL
TJIT(PK)
tR
tF
tEN
tTRI
CONDITIONS
MIN
25Mbps
TYP
MAX
250
ps
4.5V ≤ VDD_ ≤ 5.5V
0.8
3.0V ≤ VDD_ ≤ 3.6V
1.1
2.25V ≤ VDD_ ≤ 2.75V
1.5
1.71V ≤ VDD_ ≤ 1.89V
2.4
4.5V ≤ VDD_ ≤ 5.5V
1.0
3.0V ≤ VDD_≤ 3.6V
1.4
2.25V ≤ VDD_ ≤ 2.75V
1.9
1.71V ≤ VDD_ ≤ 1.89V
3.0
ENA to
OUT_,
EN_ to
OUT_,
CL = 15pF
4.5V ≤ VDD_ ≤ 5.5V
3.9
3.0V ≤ VDD_ ≤ 3.6V
6.4
2.25V ≤ VDD_ ≤ 2.75V
10.1
1.71V ≤ VDD_ ≤ 1.89V
18.4
ENA to
OUT_,
EN_ to
OUT_,
CL = 15pF
4.5V ≤ VDD_ ≤ 5.5V
6.3
3.0V ≤ VDD_ ≤ 3.6V
9.0
2.25V ≤ VDD_ ≤ 2.75V
12.6
1.71V ≤ VDD_ ≤ 1.89V
19.2
CL = 5pF
CL = 5pF
UNITS
ns
ns
ns
ns
Note 1: All devices are 100% production tested at TA = +125°C. Specifications over temperature are guaranteed by design and
characterization.
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: All measurements taken with VDDA = VDDB, unless otherwise noted.
Note 5: 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
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SYMBOL
CONDITIONS
Human Body Model, All Pins
MIN
TYP
±4
MAX
UNITS
kV
Maxim Integrated │ 10
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Table 1. Insulation Characteristics
PARAMETER
Partial Discharge Test Voltage
SYMBOL
VPR
VALUE
UNITS
Method B1 = VIORM x 1.875
(t = 1s, partial discharge < 5pC)
CONDITIONS
2078
VP
Maximum Repetitive Peak
Isolation Voltage
VIORM
(Note 6)
1108
VP
Maximum Working Isolation
Voltage
VIOWM
Continuous RMS voltage
(Note 6)
784
VRMS
Maximum Transient Isolation
Voltage
VIOTM
t = 1s
5300
VP
Maximum Withstand Isolation
Voltage
VISO
fSW = 60Hz, duration = 60s (Note 7)
3750
VRMS
VIOSM
Basic Insulation, 1.2/50µs pulse per
IEC61000-4-5
10
kV
Maximum Surge Isolation Voltage
Insulation Resistance
RIO
Barrier Capacitance Side A to
Side B
CIO
Minimum Creepage Distance
CPG
Minimum Clearance Distance
CLR
Internal Clearance
Comparative Tracking Index
VIO = 500V, TA = 25°C
>1012
VIO = 500V, 100°C ≤ TA ≤ 125°C
>1011
VIO = 500V at TS = 150°C
>109
fSW = 1MHz (Note 8)
Distance through insulation
CTI
Material Group II (IEC 60112)
Climate Category
Pollution Degree
(DIN VDE 0110, Table 1)
Ω
1.5
pF
5.5
mm
5.5
mm
0.021
mm
>400
40/125/21
2
Note 6: VISO, VIOWM, and VIORM are defined by the IEC 60747-5-5 standard.
Note 7: Product is qualified at VISO for 60s and 100% production tested at 120% of VISO for 1s.
Note 8: Capacitance is measured with all pins on field-side and logic-side tied together.
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Maxim Integrated │ 11
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Safety Limits
Damage to the IC can result in a low-resistance path
to ground or to the supply and, without current limiting,
the MAX22344–MAX22346 could dissipate excessive
amounts of power. Excessive power dissipation can damage the die and result in damage to the isolation barrier,
potentially causing downstream issues. Table 2 shows the
safety limits for the MAX22344–MAX22346.
The maximum safety temperature (TS) for the device is
the 150°C maximum junction temperature specified in the
Absolute Maximum Ratings. The power dissipation (PD)
and junction-to-ambient thermal impedance (θJA) deter-
mine the junction temperature. Thermal impedance values (θJA and θJC) are available in the Package Thermal
Characteristics section of the datasheet and power dissipation calculations are discussed in the Calculating
Power Dissipation section. Calculate the junction temperature (TJ) as:
TJ = TA + (PD x θJA)
Figure 1 and Figure 2 show the thermal derating curve
for safety limiting the power and the current of the device.
Ensure that the junction temperature does not exceed
150°C.
THERMAL DERATING CURVE
FOR SAFETY LIMITING CURRENT
1600
350
1400
300
1200
250
SAFE CURRENT LIMIT (mA)
SAFE POWER LIMIT (mW)
THERMAL DERATING CURVE
FOR SAFETY POWER LIMITING
1000
800
600
400
150
100
50
200
0
200
0
0
25
50
75
100
125
150
175
200
0
25
50
75
100
125
150
175
200
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
Figure 1. Thermal Derating Curve for Safety Power Limiting
Figure 2. Thermal Derating Curve for Safety Current Limiting
Table 2. Safety Limiting Values for the MAX22344–MAX22346
PARAMETER
SYMBOL
TEST CONDITIONS
MAX
UNIT
Safety Current on Any Pin
IS
TJ = 150°C, TA = 25°C
300
mA
Total Safety Power Dissipation
PS
TJ = 150°C, TA = 25°C
1448
mW
Maximum Safety Temperature
TS
150
°C
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Maxim Integrated │ 12
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Test Circuits and Timing Diagrams
VDDA
IN1, IN2
VDDA
0.1µF
0.1µF
VDDA
GNDA
VDDB
VDDB
50%
50%
tPHL
tPLH
VDDB
MAX2234_
OUT1
50Ω
OUT_
IN_
CL
TEST
SOURCE
GNDA
50%
50%
GNDB
RL
GNDB
VDDB
OUT2
GNDB
(A)
tSCSLH
tSCSHL
90%
50%
50%
10%
tF
tR
(B)
Figure 3. Test Circuit (A) and Timing Diagram (B)
ISOLA TION
BARRIER
VDDA OR VDDB
GNDA OR GNDB
SW1
OUT_
IN_
EN_, ENA
SW2
GENERATOR
50Ω
GNDA OR
GNDB
RL
1kΩ
CL
15pF
SW3
SW4
VDDA OR VDDB
GNDA OR GNDB
GNDA OR GNDB
MAX2234_B/C/R/S
MAX22345R/S
VDDA OR VDDB
ENA OR E NB
50%
SW1: OPEN
SW2: CLOSED
SW3: CLOSED
SW4: OPEN
50%
GNDA OR GNDB
tEN
VDDA
ENA
50%
GNDA
tEN
tTRI
VDDA OR VDDB
SW1: OPEN
SW2: CLOSED
SW3: CLOSED
SW4: OPEN
50%
tTRI
VDDA
VDD_
2
OUT_
VDD_
2
OUT_
0.25V
VOL
0.25V
VOL
MAX2234_B/C/R/S
MAX22345R/S
VDDA OR VDDB
ENA OR E NB
50%
SW1: CLOSED
SW2: OPEN
SW3: OPEN
SW4: CLOSED
50%
GNDA OR GNDB
tTRI
tEN
VOH
OUT_
VDD_
2
0.25V
GNDA OR GNDB
VDDA
ENA
50%
SW1: CLOSED
SW2: OPEN
SW3: OPEN
SW4: CLOSED
50%
GNDA
tTRI
tEN
VOH
OUT_
VDD_
2
0.25V
GNDA
Figure 4. Enable to Output Timing (tEN, tTRI)
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Maxim Integrated │ 13
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Typical Operating Characteristics
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.)
SIDE A SUPPLY CURRENT
vs. DATA RATE
1
3
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX22344B
0.9
VDDA = 1.8V
VDDA = 2.5V
0.5
1.4
VDDA = 2.5V
0.6
VDDA = 3.3V
VDDA = 5.0V
0
5
10
15
20
VDDA = 1.8V
1
0.2
25
VDDA = 3.3V
VDDA = 5.0V
0
25
50
SIDE A SUPPLY CURRENT
vs. DATA RATE
1.8
VDDA = 1.8V
VDDA = 2.5V
1
50
75
100
125
150
175
200
VDDA = 2.5V
20
25
toc06
1.8
VDDA = 2.5V
VDDA = 5.0V
0
5
10
15
20
VDDA = 1.8V
1.4
1
0.6
25
VDDA = 3.3V
VDDA = 5.0V
0
25
50
75
100
125
150
175
200
DATA RATE (Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.7
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
1.2
10
15
toc08
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX22344B
VDDB = 1.8V
1.5
15
DATA RATE (Mbps)
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10
2.2
VDDA = 3.3V
2.4
VDDB = 5.0V
5
5
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX22346C
3
toc07
VDDB = 2.5V
0
VDDA = 5.0V
0
DATA RATE (Mbps)
VDDB = 3.3V
0.9
VDDA = 3.3V
3.4
VDDB = 1.8V
1.8
VDDA = 2.5V
SIDE A SUPPLY CURRENT
vs. DATA RATE
toc05
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX22344B
2.1
VDDA = 1.8V
0.7
DATA RATE (Mbps)
VDDA = 1.8V
0.8
0.7
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.4
0.8
2.6
0.9
DATA RATE (Mbps)
2.7
0.9
0.6
200
1
VDDA = 5.0V
25
175
1.1
VDDA = 3.3V
0
150
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX22346B
1.2
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
1.3
2.2
1.4
125
SIDE A SUPPLY CURRENT
vs. DATA RATE
toc04
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX22345C/S
2.6
100
1
DATA RATE (Mbps)
DATA RATE (Mbps)
3
75
SUPPLY CURRENT (mA)
0.6
1.8
toc03
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX22345B/R
1.1
SUPPLY CURRENT (mA)
0.7
0.6
1.2
2.2
0.8
0.4
SIDE A SUPPLY CURRENT
vs. DATA RATE
toc02
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
MAX22344C
2.6
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
SIDE A SUPPLY CURRENT
vs. DATA RATE
toc01
20
25
2.1
VDDB = 2.5V
VDDB = 3.3V
VDDB = 5.0V
1.8
1.5
1.2
0.9
0
5
10
15
20
25
DATA RATE (Mbps)
Maxim Integrated │ 14
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Typical Operating Characteristics (continued)
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.)
SIDE B SUPPLY CURRENT
vs. DATA RATE
12
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX22344C
10
VDDB = 2.5V
VDDB = 3.3V
VDDB = 5.0V
6
4
2
0
0
25
50
75
100
125
150
175
8
VDDB = 5.0V
4
2
0
200
0
25
50
12
10
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
VDDB = 2.5V
VDDB = 5.0V
1.5
1.2
0
5
10
15
20
8
175
12
5
VDDB = 5.0V
6
4
2
0
25
50
75
100
125
150
175
1.3
1
10
15
DATA RATE (Mbps)
www.maximintegrated.com
20
25
toc14
VDDB = 2.5V
VDDB = 3.3V
VDDB = 5.0V
6
4
2
0
25
50
75
100
125
150
175
200
DATA RATE (Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.5
toc16
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX22346B
VDDB = 1.8V
VDDB = 5.0V
5
15
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX22345C/S
8
0
200
2.2
VDDB = 2.5V
0
10
VDDB = 1.8V
VDDB = 2.5V
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
0
10
toc15
VDDB = 3.3V
0.7
1.2
SIDE B SUPPLY CURRENT
vs. DATA RATE
toc13
VDDB = 1.8V
1.6
1.5
DATA RATE (Mbps)
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX22346B
1.9
VDDB = 5.0V
DATA RATE (Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.2
VDDB = 3.3V
1.8
0.9
200
VDDB = 3.3V
0
25
DATA RATE (Mbps)
2.5
150
VDDB = 2.5V
VDDB = 1.8V
VDDB = 3.3V
0.9
125
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX22345C/S
VDDB = 1.8V
1.8
100
SIDE B SUPPLY CURRENT
vs. DATA RATE
toc12
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX22345B/R
2.1
75
2.1
DATA RATE (Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
2.4
VDDB = 1.8V
VDDB = 3.3V
DATA RATE (Mbps)
2.7
2.4
VDDB = 2.5V
6
toc11
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX22345B/R
VDDB = 1.8V
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
VDDB = 1.8V
8
2.7
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX22344C
SUPPLY CURRENT (mA)
10
SIDE B SUPPLY CURRENT
vs. DATA RATE
toc10
SUPPLY CURRENT (mA)
12
SIDE B SUPPLY CURRENT
vs. DATA RATE
toc09
20
25
1.9
VDDB = 2.5V
VDDB = 3.3V
VDDB = 5.0V
1.6
1.3
1
0.7
0
5
10
15
20
25
DATA RATE (Mbps)
Maxim Integrated │ 15
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Typical Operating Characteristics (continued)
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.)
SIDE B SUPPLY CURRENT
vs. DATA RATE
SIDE B SUPPLY CURRENT
vs. DATA RATE
toc17
12
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 0pF, MAX22346C
10
10
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
VDDB = 3.3V
VDDB = 5.0V
4
2
8
28
VDDB = 2.5V
VDDB = 3.3V
VDDB = 5.0V
6
toc19
VDDA = VDDB
INA TO OUTB, tPLH
MAX2234_B/R
30
VDDB = 1.8V
VDDB = 2.5V
6
32
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNELS ARE IN DEFAULT STATE
CL = 15pF, MAX22346C
VDDB = 1.8V
8
PROPAGATION DELAY
vs. TEMPERATURE
toc18
PROPAGATION DELAY (ns)
12
4
2
26
24
VDD_ = 1.8V
22
VDD_ = 2.5V
VDD_ = 3.3V
20
VDD_ = 5.0V
0
25
50
75
100
125
150
175
0
200
0
25
50
DATA RATE (Mbps)
125
150
175
18
200
-50
-25
0
30
VDDA = VDDB
INA TO OUTB, tPLH
MAX2234_C/S
9
6
VDD_ = 1.8V
VDD_ = 2.5V
3
VDD_ = 3.3V
20
50
75
PROPAGATION DELAY
vs. VDDB VOLTAGE
toc21
30
VDDB = 3.3V
INA TO OUTB, tPLH
25
25
100
125
TEMPERATURE (⁰C)
PROPAGATION DELAY
vs. VDDA VOLTAGE
toc20
PROPAGATION DELAY (ns)
PROPAGATION DELAY (ns)
12
100
DATA RATE (Mbps)
PROPAGATION DELAY
vs. TEMPERATURE
15
75
MAX2234_B/R
15
MAX2234_C/S
10
5
toc22
VDDA = 3.3V
INA TO OUTB, tPLH
25
PROPAGATION DELAY (ns)
0
20
MAX2234_B/R
15
MAX2234_C/S
10
5
VDD_ = 5.0V
0
-50
-25
0
25
50
75
100
0
125
TEMPERATURE (⁰C)
MINIMUM PULSE WIDTH
1.5
2.5
3.5
4.5
0
5.5
1.5
VDDA VOLTAGE (V)
2.5
3.5
4.5
MINIMUM PULSE WIDTH
toc23
MAX2234_B/R
40ns PULSE
toc24
MAX2234_CS
5ns PULSE
IN_
1V/div
IN_
1V/div
OUT_
1V/div
OUT_
1V/div
20ns/div
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5.5
VDDB VOLTAGE (V)
5ns/div
Maxim Integrated │ 16
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Typical Operating Characteristics (continued)
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, VGNDA = VGNDB, TA = +25°C, unless otherwise noted.)
EYE DIAGRAM AT 200MBPS
MAX2234_C/S
CLOCK JITTER RMS ON RISING EDGE
MAX2234_C/S
toc26
toc25
500kHz CLOCK INPUT
tJCLK(RMS) = 7.5ps
VDDB = 3.0V
400mV/div
400mV/div
OUT_
125ps/div
1ns/div
CLOCK JITTER RMS ON FALLING EDGE
MAX2234_C/S
CLOCK JITTER RMS
vs. TEMPERATURE
toc27
toc28
16
500kHz CLOCK INPUT
tJCLK(RMS) = 8.0ps
500kHz CLOCK INPUT
VDD_ = 5.0V
MAX2234_C/S
14
400mV/div
OUT_
CLOCK JITTER RMS (ps)
12
FALLING EDGE
10
8
6
RISING EDGE
4
2
0
125ps/div
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
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Maxim Integrated │ 17
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Pin Configurations
TOP VIEW
VDDA
1
GNDA
2
IN1
+
+
20 VDDB
VDDA
1
19 GNDB
GNDA
2
3
18 OUT1
IN1
3
18 OUT1
IN2
4
17 OUT2
IN2
4
17 OUT2
IN3
5
16 OUT3
IN3
5
16 OUT3
IN4
6
15 OUT4
OUT4
6
15 IN4
DEFA
7
14 DEFB
DEFA
7
14 DEFB
I.C.
8
13 ENB
ENA
8
13 ENB
N.C.
9
12 N.C.
N.C.
9
12 N.C.
MAX22344B/C
GNDA 10
11 GNDB
MAX22345B/C
GNDA 10
1
GNDA
2
IN1
+
19 GNDB
11 GNDB
SSOP
VDDA
20 VDDB
SSOP
+
20 VDDB
VDDA
1
19 GNDB
GNDA
2
3
18 OUT1
IN1
3
18 OUT1
IN2
4
17 OUT2
IN2
4
17 OUT2
IN3
5
16 OUT3
OUT3
5
16 IN3
OUT4
6
15 IN4
OUT4
6
15 IN4
DEFA
7
14 DEFB
DEFA
7
14 DEFB
ENA
8
13 ENB
ENA
8
13 ENB
N.C.
9
12 N.C.
N.C.
9
12 N.C.
MAX22345R/S
GNDA 10
11 GNDB
SSOP
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MAX22346B/C
GNDA 10
20 VDDB
19 GNDB
11 GNDB
SSOP
Maxim Integrated │ 18
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Pin Description
PIN
NAME
MAX22344B/C
MAX22345B/C
MAX22345R/S
MAX22346B/C
VDDA
1
1
1
1
GNDA
2, 10
2, 10
2, 10
2, 10
IN1
3
3
3
3
IN2
4
4
4
4
IN3
5
5
5
16
IN4
6
15
15
15
DEFA
7
7
7
7
I.C.
8
—
—
—
N.C.
9, 12
9, 12
9, 12
9, 12
ENA
—
8
—
8
ENA
—
—
8
—
GNDB
11, 19
11, 19
11, 19
11, 19
ENB
13
13
13
13
DEFB
14
14
14
14
OUT4
15
6
6
6
OUT3
16
16
16
5
OUT2
17
17
17
17
OUT1
18
18
18
18
VDDB
20
20
20
20
www.maximintegrated.com
Maxim Integrated │ 19
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Pin Description (continued)
NAME
FUNCTION
POWER
VDDA
Power Supply Input for Side A. Bypass VDDA to GNDA with a 0.1μF ceramic capacitor as close as possible
to the pin.
GNDA
Ground Reference for Side A.
VDDB
Power Supply Input for Side B. Bypass VDDB to GNDB with a 0.1μF ceramic capacitor as close as
possible to the pin.
GNDB
Ground reference for Side B.
INPUTS
IN1
Logic Input 1 on Side A. Corresponds to Logic Output 1 on Side B.
IN2
Logic Input 2 on Side A. Corresponds to Logic Output 2 on Side B.
IN3
Logic Input 3 on Side A/B. Corresponds to Logic Output 3 on Side B/A.
IN4
Logic Input 4 on Side A/B. Corresponds to Logic Output 4 on Side B/A.
OUTPUTS
OUT1
Logic Output 1 on Side B. OUT1 is the logic output for the IN1 input on Side A.
OUT2
Logic Output 2 on Side B. OUT2 is the logic output for the IN2 input on Side A.
OUT3
Logic Output 3 on Side B/A. OUT3 is the logic output for the IN3 input on Side A/B.
OUT4
Logic Output 4 on Side B/A. OUT4 is the logic output for the IN4 input on Side A/B.
ENABLE INPUTS
ENA
Active-High Enable for Side A. ENA has an internal 5μA pull-up to VDDA.
ENA
Active-Low Enable for Side A. ENA has an internal 5μA pull-down to GNDA.
ENB
Active-High Enable for Side B. ENB has an internal 5μA pull-up to VDDB.
DEFAULT CONTROL
DEFA
Default Control Input for Side A. Connect DEFA to VDDA to set side A outputs to a default-high state and to
enable the pullup current on side A inputs. Connect DEFA to GNDA to set side A outputs to a default-low
state and enable the pulldown current on side A inputs. DEFA must be tied to the same state (high or low)
as DEFB.
DEFB
Default Control Input for Side B. Connect DEFB to VDDB to set side B outputs to a default-high state and to
enable the pullup current on side B inputs. Connect DEFB to GNDB to set side B outputs to a default-low
state and enable the pulldown current on side B inputs. DEFB must be tied to the same state (high or low)
as DEFA.
INTERNALLY CONNECTED, NOT CONNECTED
I.C.
N.C.
www.maximintegrated.com
Internally Connected. Leave unconnected or connect to GNDA or VDDA.
Not Connected. Not internally connected.
Maxim Integrated │ 20
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Functional Diagram
VDDA
MAX22344B/C
VDDB
VDDA
MAX22345B/C
ENB
ENB
IN1
OUT1
IN1
OUT1
IN2
OUT2
IN2
OUT2
IN3
OUT3
IN3
OUT3
IN4
OUT4
IN4
DEFA
DEFB
GNDB
GNDA
GNDB
VDDB
VDDA
DEFA
DEFB
GNDA
VDDA
OUT4
ENA
I.C.
MAX22345R/S
ENB
MAX22346B/C
VDDB
ENB
IN1
OUT1
IN1
OUT1
IN2
OUT2
IN2
OUT2
IN3
OUT3
OUT4
IN4
ENA
DEFA
GNDA
www.maximintegrated.com
VDDB
OUT3
IN3
OUT4
IN4
ENA
DEFB
GNDB
DEFA
DEFB
GNDA
GNDB
Maxim Integrated │ 21
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Detailed Description
Digital Isolation
The MAX22344–MAX22346 provide reinforced galvanic
isolation for digital signals that are transmitted between
two ground domains. The devices withstand differences
of up to 3.75kVRMS for up to 60 seconds, and up to
1108VPEAK of continuous isolation.
The MAX22344–MAX22346 are a family of 4-channel
reinforced digital isolators. The MAX22344–MAX22346
have an isolation rating of 3.75kVRMS. The MAX22344–
MAX22346 family offers all 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.
Level-Shifting
The wide supply voltage range of both VDDA and VDDB
allows the MAX22344–MAX22346 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.
The MAX22344 features four channels transferring digital
signals in one direction for applications such as isolated
digital I/O. The MAX22345 has three channels transmitting
data in one direction and one channel transmitting in the
opposite direction, making them ideal for applications
such as isolated SPI and RS-485 communication. The
MAX22346 provides further design flexibility with two
channels in each direction for isolated RS-232 or other
applications.
Unidirectional Channels
Each channel of the MAX22344–MAX22346 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/R versions), or from
DC to 200Mbps (C/S 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.
Devices are available in a 20-pin SSOP package and are
rated for up to 3.75kVRMS. 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.
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 3 , Table 4). Figure 5 through
Figure 8 show the behavior of the outputs during powerup and power-down.
Devices are available with a maximum data rate of either
25Mbps (B/R versions) or 200Mbps (C/S versions). All
devices feature user-selectable 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 MAX22344–MAX22346 also
feature a refresh circuit to ensure output accuracy when an
input remains in the same state indefinitely.
Table 3. MAX2234_B/C Output Behavior During Undervoltage Conditions
VIN_
VDDA
VDDB
1
Powered
Powered
0
Powered
Powered
X
X
Undervoltage
Powered
www.maximintegrated.com
Powered
Undervoltage
ENA
ENB
VOUTA
VOUTB
1
1
High
High
0
0
Hi-Z
Hi-Z
1
1
Low
Low
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
Maxim Integrated │ 22
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Table 4. MAX22345R/S Output Behavior During Undervoltage Conditions
VIN_
VDDA
VDDB
1
Powered
Powered
0
Powered
Powered
X
Undervoltage
Powered
X
Powered
Undervoltage
MAX2234_B/C/R/S
INPUTS SET TO HIGH
ENA
ENB
VOUTA
VOUTB
0
1
High
High
1
0
Hi-Z
Hi-Z
0
1
Low
Low
1
0
Hi-Z
Hi-Z
0
1
Default
Default
1
0
Hi-Z
Hi-Z
0
1
Default
Default
1
0
Hi-Z
Hi-Z
MAX2234_B/C/R/S
INPUTS SET TO HIGH
fig05
fig06
DEFAULT SET TO LOW
DEFAULT SET TO HIGH
VDDA
VDDA
VDDB
2V/div
VDDB
2V/div
OUT_A
OUT_A
OUT_B
OUT_B
200µs/div
Figure 5. Undervoltage Lockout Behavior (MAX2234_ High)
www.maximintegrated.com
200µs/div
Figure 6. Undervoltage Lockout Behavior (MAX2234_ High)
Maxim Integrated │ 23
MAX22344/MAX22345/
MAX22346
MAX2234_B/C/R/S
INPUTS SET TO LOW
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
MAX2234_B/C/R/S
INPUTS SET TO LOW
fig07
fig08
DEFAULT SET TO LOW
DEFAULT SET TO HIGH
VDDA
VDDA
VDDB
VDDB
2V/div
OUT_A
OUT_A
OUT_B
OUT_B
2V/div
200µs/div
200µs/div
Figure 7. Undervoltage Lockout Behavior (MAX2234_ Low)
Figure 8. Undervoltage Lockout Behavior (MAX2234_ Low)
Selectable Output Default (DEFA, DEFB)
●● Keep the input/output traces as short as possible. To
keep signal paths low-inductance, avoid using vias.
The default is the state the output assumes when the
input is not powered or if the input is open circuit. The
MAX22344-MAX22346 feature user-selectable defaulthigh or default-low outputs. Set both DEFA and DEFB
high to set all channels to default-high, or set both DEFA
and DEFB low to set all channels to default-low.
Ensure the logic state (high or low) of DEFA is the same
as that for DEFB. Do not toggle DEFA or DEFB during
normal operation.
Applications Information
Power-Supply Sequencing
The MAX22344-MAX22346 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.
Layout Considerations
The PCB designer should follow some critical recommendations in order to get the best performance from the
design.
●● Have a solid ground plane underneath the highspeed signal layer.
●● Keep the area underneath the MAX22344–MAX22346
free from ground and signal planes. Any galvanic or
metallic connection between the Side A and Side B
defeats the isolation.
Calculating Power Dissipation
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
9 and Figure 10. Please note the data in Figure 9 and
Figure 10 are extrapolated from the supply current
measurements in a typical operating condition.
The total current for a single channel is the sum of the
“no load” current (shown in Figure 9 and Figure 10) 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.
ICL = CL × fSW × VDD
where
ICL is the current required to drive the capacitive load.
CL is the load capacitance on the isolator’s output pin.
www.maximintegrated.com
Maxim Integrated │ 24
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
fSW is the switching frequency (bits per second/2).
●● Channel 2 and 3 are input channels operating at
2.5V with DC signal, consuming 0.14mA, estimated
from Figure 9.
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 4 is an output channel operating at 2.5V and
100Mbps, consuming 0.77mA, estimated from Figure 10.
●● ICL on channel 4 for 15pF capacitor at 2.5V and
100Mbps is 1.875mA.
IRL = VDD ÷ RL
Total current for side A = 0.33 + 0.14 × 2 + 0.77 +
1.875 = 3.255mA, typical
where
IRL is the current required to drive the resistive load.
VDDB must supply:
VDD is the supply voltage on the output side of the isolator.
●● Channel 1 is an output channel operating at 3.3V and
20Mbps, consuming 0.40mA, estimated from Figure 10.
RL is the load resistance on the isolator’s output pin.
Example (shown in Figure 11): A MAX22345C 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 5 and Table 6 for
VDDA and VDDB supply current calculation worksheets.
●● Channel 2 and 3 are output channels operating at
3.3V with DC signal, consuming 0.27mA, estimated
from Figure 10.
●● Channel 4 is an input channel operating at 3.3V and
100Mbps, consuming 1.11mA, estimated from Figure 9.
●● ICL on channel 1 for 10pF capacitor at 3.3V and
20Mbps is 0.33mA.
VDDA must supply:
●● IRL on channel 2 for 10kΩ resistor held at 3.3V is
0.33mA.
●● Channel 1 is an input channel operating at 2.5V and
20Mbps, consuming 0.33mA, estimated from Figure 9.
Total current for side B = 0.40 + 0.27 × 2 + 1.11 + 0.33
+ 0.33 = 2.71mA, typical
Table 5. Side A Supply Current Calculation Worksheet
SIDE A
1
IN/
OUT
IN
Data Rate
(Mbps)
20
2
IN
0
3
IN
0
4
OUT
100
Channel
Load Type
VDDA = 2.5V
“No Load” Current
Load
(mA)
0.33
Load Current
(mA)
0.14
0.14
Capacitive
15pF
0.77
2.5V x 50MHz x 15pF = 1.875mA
Load
“No Load” Current
(mA)
Load Current
(mA)
Total: 3.26mA
Table 6. Side B Supply Current Calculation Worksheet
SIDE B
VDDB = 3.3V
Channel
IN/
OUT
Data Rate
(Mbps)
Load Type
1
OUT
20
Capacitive
10pF
0.40
3.3V x 10MHz x 10pF = 0.33mA
2
OUT
0
Resistive
10kΩ
0.27
3.3V / 10kΩ = 0.33mA
3
OUT
0
0.27
4
IN
100
1.11
Total: 2.71mA
www.maximintegrated.com
Maxim Integrated │ 25
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
SUPPLY CURRENT PER OUTPUT CHANNEL
vs. DATA RATE
SUPPLY CURRENT PER INPUT CHANNEL
vs. DATA RATE
fig09
2.5
VDDB = 1.8V
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
VDDB = 2.5V
2.5
2
1.5
1
VDDA = 1.8V
VDDA = 2.5V
0.5
VDDA = 3.3V
VDDA = 5.0V
0
fig10
3
0
25
50
75
100
125
150
175
VDDB = 5.0V
2
CL = 0pF
1.5
1
0.5
0
200
VDDB = 3.3V
0
25
50
75
100
125
150
175
200
DATA RATE (Mbps)
DATA RATE (Mbps)
Figure 9. Supply Current Per Input Channel (Estimated)
Figure 10. Supply Current Per Output Channel (Estimated)
2.5V
3.3V
VDDA
VDDB
MAX22345C
ENB
20Mbps
20Mbps
IN1
OUT1
10pF
2.5V
IN2
OUT2
10kΩ
IN3
OUT3
100Mbps
100Mbps
OUT4
IN4
15pF
ENA
DEFA
DEFB
GNDA
GNDB
Figure 11. Example Circuit for Supply Current Calculation
www.maximintegrated.com
Maxim Integrated │ 26
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Typical Operating Circuits
3.3V
5V
VDDA
VDDB
MAX22344B/C
0.1µF
ENB
IN1
OUT1
IN2
OUT2
IN3
OUT3
IN4
OUT4
DEFA
DEFB
GNDA
GNDB
3.3V
5V
VDDB
0.1µF
VDDA
MAX22344B/C
0.1µF
5V VOUT
24V DIGITAL I/O
WITH 5V INTERFACE
GPIO PORT
0.1µF
24V
ENB
OUT1
IN1
OUT2
IN2
OUT3
IN3
OUT4
IN4
DEFB
DEFA
GNDB
GNDA
ISOLATED DIGITAL I/O
www.maximintegrated.com
Maxim Integrated │ 27
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Typical Operating Circuits (continued)
2.5V
3.3V
VDDA
0.1µF
VDDB
0.1µF
MAX22345R/S
ENB
CS
IN1
OUT1
CS
MICROCONTROLLER
SCLK
OUT2
IN2
SCLK
MOSI
ADC
MISO
MOSI
MISO
IN3
OUT3
OUT4
IN4
ENA
DEFA
DEFB
GNDA
GNDB
ISOLATED SPI INTERFACE
www.maximintegrated.com
Maxim Integrated │ 28
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Typical Operating Circuits (continued)
5V
2.5V
VDDA
MAX22346B/C
0.1µF
VDDB
IN1
OUT1
IN2
OUT2
OUT3
IN3
OUT4
IN4
0.1µF
T1IN
T2IN
R1OUT
MAX13223 RS-232 TRANSCEIVER
MICROCONTROLLER
ENB
R2OUT
ENA
DEFA
DEFB
GNDA
GNDB
ISOLATED RS-232 INTERFACE
www.maximintegrated.com
Maxim Integrated │ 29
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Product Selector Guide
MAX2234 4 B A A
P +
Channel Configuration
4: 4/0
5: 3/1
6: 2/2
Maximum Data Rate
ENA Polarity
(see Table)
MAXIMUM DATA RATE
ENA
ENA
25Mbps
200Mbps
B
C
R
S
Temp Range: -40º C to +125º C
Package: SSOP
Pins: 20
Lead-Free/RoHS compliant
Ordering Information
PART
CHANNEL
CONFIGURATION
DATA RATE
(Mbps)
ENA
POLARITY
ISOLATION
VOLTAGE
(kVRMS)
TEMP RANGE
(°C)
PINPACKAGE
MAX22344BAAP+*
4/0
25
–
3.75
-40 to +125
20 SSOP
MAX22344CAAP+
4/0
200
–
3.75
-40 to +125
20 SSOP
MAX22345BAAP+*
3/1
25
Active-High
3.75
-40 to +125
20 SSOP
MAX22345CAAP+*
3/1
200
Active-High
3.75
-40 to +125
20 SSOP
MAX22345RAAP+*
3/1
25
Active-Low
3.75
-40 to +125
20 SSOP
MAX22345SAAP+
3/1
200
Active-Low
3.75
-40 to +125
20 SSOP
MAX22346BAAP+*
2/2
25
Active-High
3.75
-40 to +125
20 SSOP
MAX22346CAAP+
2/2
200
Active-High
3.75
-40 to +125
20 SSOP
*Future product—contact factory for availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
www.maximintegrated.com
Maxim Integrated │ 30
MAX22344/MAX22345/
MAX22346
Reinforced, Fast, Low-Power,
Four-Channel 3.75kVRMS Digital Isolators
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
2/18
Initial release
1
10/18
Updated title, added future product designation to MAX22344CAAP+ and
removed it from MAX22345SAAP+ in the Ordering Information table.
2
2/19
Removed future product designation from MAX22344CAAP+ in the Ordering
Information table.
30
3
3/19
Removed future product designation from MAX22346CAAP+ in the Ordering
Information table.
30
DESCRIPTION
—
1–30
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. │ 31
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