Maxim MAX12935 Two-channel, fast, low-power, 5kvrms digital isolator Datasheet

EVALUATION KIT AVAILABLE
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
General Description
Benefits and Features
The two channels of the MAX12935 transfer data in opposite
directions, making the MAX12935 ideal for isolating the
TX and RX lines of a transceiver. The two channels of the
MAX12934 transfer data in the same direction.
●● Low Power Consumption
• 1.3mW per Channel at 2Mbps with VDD = 3.3V
• 3.3mW per Channel at 100Mbps with VDD = 1.8V
The MAX12934/MAX12935 are the fastest, lowest power,
2-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 0.65mW
per channel at 1Mbps with a 1.8V supply.
The MAX12934/MAX12935 have an isolation rating
of 5kVRMS for 60 seconds. Both 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 not powered or if the
input 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 MAX12934/MAX12935 are available in a 16-pin,
wide-body SOIC package. 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
• 200 Mbps 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)
• 2 Channel Direction Configurations
• 2 Output Default States (High or Low)
Applications
●●
●●
●●
●●
●●
Fieldbus Communications for Industrial Automation
Isolated RS232, RS-485/RS-422, CAN
General Isolation Application
Battery Management
Medical Systems
Safety Regulatory Approvals
(see Safety Regulatory Approvals)
●● UL According to UL1577
●● cUL According to CSA Bulletin 5A
Ordering Information appears at end of data sheet.
Functional Diagrams
19-100137; Rev 0; 8/17
MAX12934
MAX12935
VDDB
VDDA
IN1
OUT1
OUT1
IN2
OUT2
IN2
OUT2
GNDA
GNDB
GNDA
GNDB
VDDA
VDDB
IN1
MAX12934/MAX12935
Two-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_ on Side A to GNDA............................................-0.3V to +6V
IN_ 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 (VDDA + 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, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Thermal Characteristics (Note 1)
Wide SOIC
Junction-to-Ambient Thermal Resistance (θJA)...........71°C/W
Junction-to-Case Thermal Resistance (θJC)................23°C/W
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.
DC Electrical Characteristics
(VDDA - VGNDA = 1.71V to 5.5V, VDDB - VGNDB = 1.71V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at
VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, GNDA = GNDB, TA = 25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY
Supply Voltage
Undervoltage-Lockout
Threshold
Undervoltage-Lockout
Threshold Hysteresis
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VDDA
Relative to GNDA
1.71
5.5
VDDB
Relative to GNDB
1.71
5.5
VDD_ rising
1.5
VUVLO_
VUVLO_HYST
1.6
45
1.66
V
V
mV
Maxim Integrated │ 2
MAX12934/MAX12935
Two-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, TA = -40°C to +125°C, unless otherwise noted. Typical values are at
VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, GNDA = GNDB, TA = 25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
1MHz square
wave, CL = 0pF
IDDA
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
1MHz square
wave, CL = 0pF
IDDB
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
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TYP
MAX
VDDA = 5V
0.32
0.58
VDDA = 3.3V
0.31
0.54
VDDA = 2.5V
0.3
0.53
VDDA = 1.8V
0.29
0.39
VDDA = 5V
0.81
1.26
VDDA = 3.3V
0.8
1.20
VDDA = 2.5V
0.78
1.18
VDDA = 1.8V
0.77
1.01
VDDA = 5V
2.15
3.00
VDDA = 3.3V
2.09
2.91
VDDA = 2.5V
2.06
2.88
VDDA = 1.8V
Supply Current (MAX12934_)
(Note 3)
MIN
2
2.62
VDDB = 5V
0.5
0.83
VDDB = 3.3V
0.47
0.79
VDDB = 2.5V
0.45
0.76
VDDB = 1.8V
0.4
0.67
VDDB = 5V
1.37
1.83
VDDB = 3.3V
1.02
1.40
VDDB = 2.5V
0.87
1.22
VDDB = 1.8V
0.71
1.00
VDDB = 5V
4.21
4.99
VDDB = 3.3V
2.81
3.39
VDDB = 2.5V
2.21
2.69
VDDB = 1.8V
1.69
2.04
UNITS
mA
mA
Maxim Integrated │ 3
MAX12934/MAX12935
Two-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, TA = -40°C to +125°C, unless otherwise noted. Typical values are at
VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, GNDA = GNDB, TA = 25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
1MHz square
wave, CL = 0pF
IDDA
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
Supply Current (MAX12935_)
(Note 3)
1MHz square
wave, CL = 0pF
IDDB
12.5MHz square
wave, CL = 0pF
50MHz square
wave, CL = 0pF
MIN
TYP
MAX
VDDA = 5V
0.42
0.70
VDDA = 3.3V
0.39
0.67
VDDA = 2.5V
0.38
0.64
VDDA = 1.8V
0.36
0.56
VDDA = 5V
1.07
1.52
VDDA = 3.3V
0.89
1.29
VDDA = 2.5V
0.81
1.19
VDDA = 1.8V
0.73
1.03
VDDA = 5V
3.06
3.87
VDDA = 3.3V
2.37
3.06
VDDA = 2.5V
2.08
2.72
VDDA = 1.8V
1.82
2.33
VDDB = 5V
0.42
0.70
VDDB = 3.3V
0.39
0.67
VDDB = 2.5V
0.38
0.64
VDDB = 1.8V
0.36
0.56
VDDB = 5V
1.07
1.52
VDDB = 3.3V
0.89
1.29
VDDB = 2.5V
0.81
1.19
VDDB = 1.8V
0.73
1.03
VDDB = 5V
3.06
3.87
VDDB = 3.3V
2.37
3.06
VDDB = 2.5V
2.08
2.72
VDDB = 1.8V
1.82
2.33
UNITS
mA
mA
LOGIC INPUTS AND OUTPUTS
Input High Voltage
VIH
Input Low Voltage
VIL
Input Hysteresis
VHYS
2.25V ≤ VDD_ ≤ 5.5V
0.7 x VDD_
1.71V ≤ VDD_ < 2.25V
0.75 x VDD_
V
2.25V ≤ VDD_ ≤ 5.5V
0.8
1.71V ≤ VDD_ < 2.25V
0.7
MAX1293_B/E
410
MAX1293_C/F
80
V
mV
Input Pullup Current (Note 4)
IPU
IN_, MAX1293_B/C
-10
-5
-1.5
µA
Input Pulldown Current (Note 4)
IPD
IN_, MAX1293_E/F
1.5
5
10
µA
Input Capacitance
CIN
IN_, fSW = 1MHz
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2
pF
Maxim Integrated │ 4
MAX12934/MAX12935
Two-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, TA = -40°C to +125°C, unless otherwise noted. Typical values are at
VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, GNDA = GNDB, TA = 25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Output Voltage High (Note 4)
VOH
IOUT = 4mA source
Output Voltage Low (Note 4)
VOL
IOUT = 4mA sink
MIN
TYP
MAX
VDD_ - 0.4
UNITS
V
0.4
V
Dynamic Characteristics MAX1293_B/E
(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, GNDA = GNDB, TA = 25°C, unless otherwise noted.) (Note 3)
PARAMETER
Common-Mode Transient Immunity
SYMBOL
CMTI
Maximum Data Rate
DRMAX
Minimum Pulse Width
PWMIN
CONDITIONS
IN_ = GND_ or VDD_ (Note 5)
Propagation Delay
(Figure 1)
tPHL
Pulse Width Distortion
Propagation Delay Skew
Part-to-Part (same channel)
tSPHL
Propagation Delay Skew
Channel-to-Channel
(Same Direction)
MAX12934 only
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MAX
UNITS
kV/µs
50
Mbps
40
ns
ns
10
17
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
PWD
tSPLH
TYP
25
Glitch Rejection
tPLH
MIN
4.5V ≤ VDD_ ≤ 5.5V
15.1
3.0V ≤ VDD_ ≤ 3.6V
15
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
1.71V ≤ VDD_ ≤ 1.89V
21.8
tSCSLH
2
tSCSHL
2
ns
ns
ns
ns
Maxim Integrated │ 5
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Dynamic Characteristics MAX1293_B/E (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, GNDA = GNDB, TA = 25°C, unless otherwise noted.) (Note 3)
PARAMETER
Propagation Delay Skew
Channel-to-Channel
(Opposite Direction)
MAX12935 Only
Peak Eye Diagram Jitter
Rise Time
Fall Time
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SYMBOL
CONDITIONS
MIN
TYP
MAX
tSCOLH
2
tSCOHL
2
TJIT(PK)
tR
tF
25Mbps
250
UNITS
ns
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
ns
ns
Maxim Integrated │ 6
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Dynamic Characteristics MAX1293_C/F
(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, GNDA = GNDB, 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
Propagation Delay Skew
Part-to-Part (Same Channel)
tSPHL
Peak Eye Diagram Jitter
Clock Jitter RMS
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MIN
IN_ = GND_ or VDD_ (Note 5)
TYP
MAX
200
1.71V ≤ VDD_ ≤ 1.89V
150
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
4.5V ≤ VDD_ ≤ 5.5V
3.7
3.0V ≤ VDD_ ≤ 3.6V
4.3
2.25V ≤ VDD_ ≤ 2.75V
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
2
tSCSHL
2
tSCOLH
2
tSCOHL
2
TJIT(PK)
TJCLK(RMS)
UNITS
kV/µs
50
2.25V ≤ VDD_ ≤ 5.5V
PWD
tSPLH
Propagation Delay Skew
Channel-to-Channel (Same
Direction) MAX12934 Only
Propagation Delay Skew
Channel-to-Channel (Opposite
Direction) MAX12935 Only
CONDITIONS
ns
ns
ns
ns
ns
ns
200Mbps
90
ps
500kHz Clock Input Rising/Falling
Edges
6.5
ps
Maxim Integrated │ 7
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Dynamic Characteristics MAX1293_C/F (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, GNDA = GNDB, TA = 25°C, unless otherwise noted.) (Note 3)
PARAMETER
Rise Time
Fall Time
SYMBOL
tR
tF
CONDITIONS
MIN
TYP
MAX
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
UNITS
ns
ns
Note 2: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.
Note 3: Not production tested. Guaranteed by design and characterization.
Note 4: 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 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
SYMBOL
ESD
CONDITIONS
Human Body Model, all pins
MIN
TYP
MAX
±3
UNITS
kV
Safety Regulatory Approvals
UL
The MAX12934–MAX12935 wide-body SOIC are certified under UL1577. For more details, refer to file E351759.
Rated up to 5000VRMS isolation voltage for single protection.
cUL (Equivalent to CSA notice 5A)
The MAX12934/MAX12935 wide-body SOIC are certified up to 5000VRMS for single protection. For more details, refer to file E351759.
www.maximintegrated.com
Maxim Integrated │ 8
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Table 1. Insulation Characteristics
PARAMETER
Partial Discharge Test Voltage
SYMBOL
VPR
CONDITIONS
VALUE
UNITS
Method B1 = VIORM x 1.875
(t = 1s, partial discharge < 5pC)
2250
VP
Maximum Repetitive Peak
Isolation Voltage
VIORM
(Note 6)
1200
VP
Maximum Working Isolation
Voltage
VIOWM
Continuous RMS voltage
(Note 6)
848
VRMS
Maximum Transient Isolation
Voltage
VIOTM
t = 1s
8400
VP
Maximum Withstand Isolation
Voltage
VISO
fSW = 60Hz, duration = 60s (Note 7)
5000
VRMS
VIOSM
Basic Insulation, 1.2/50µs pulse per
IEC61000-4-5
10
kV
>109
Ω
2
pF
Maximum Surge Isolation Voltage
Insulation Resistance
RS
VIO = 500V
Barrier Capacitance Side A to Side B
CIO
fSW = 1MHz (Note 8)
Minimum Creepage Distance
CPG
8
mm
Minimum Clearance Distance
CLR
8
mm
Distance through insulation
0.015
mm
Material Group I (IEC60112)
>600
Internal Clearance
Comparative Tracking Index
CTI
Climate Category
Pollution Degree
(DIN VDE 0110, Table 1)
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 side A and side B tied together.
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Maxim Integrated │ 9
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
VDDA
50%
0.1µF
0.1µF
VDDA
GNDA
VDDB
VDDB
VDDA
50%
GNDB
CL
GNDA
tPHL
50%
OUT_
IN_
TEST
SOURCE
tPLH
VDDB
MAX12934
MAX12935
50Ω
50%
tSCSLH
RL
GNDB
VDDB
GNDB
(A)
tSCSHL
90%
50%
50%
10%
tF
tR
(B)
Figure 1. Test Circuit (A) and Timing Diagram (B)
Typical Operating Characteristics
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, GNDA = GNDB, TA = +25°C, unless otherwise noted.)
1.0
VDDA = 5.0V
VDDA = 3.3V
VDDA = 2.5V
VDDA = 1.8V
SUPPLY CURRENT (mA)
0.4
toc02
1.0
VDDA
VDDA
VDDA
VDDA
= 5.0V
= 3.3V
= 2.5V
= 1.8V
0.0
0.0
0
5
10
15
DATA RATE (Mbps)
www.maximintegrated.com
20
25
toc03
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNEL IS HIGH
MAX12935B/E
0.8
1.5
0.5
SIDE A SUPPLY CURRENT
vs. DATA RATE
1.0
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNEL IS HIGH
MAX12934C/F
2.0
0.6
0.2
SIDE A SUPPLY CURRENT
vs. DATA RATE
2.5
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNEL IS HIGH
MAX12934B/E
0.8
SUPPLY CURRENT (mA)
toc01
SUPPLY CURRENT (mA)
SIDE A SUPPLY CURRENT
vs. DATA RATE
0.6
0.4
VDDA = 5.0V
VDDA = 3.3V
VDDA = 2.5V
VDDA = 1.8V
0.2
0.0
0
25
50
75
100
125
DATA RATE (Mbps)
150
175
200
0
5
10
15
20
25
DATA RATE (Mbps)
Maxim Integrated │ 10
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Characteristics (continued)
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, GNDA = GNDB, TA = +25°C, unless otherwise noted.)
1.0
VDDA
VDDA
VDDA
VDDA
= 5.0V
= 3.3V
= 2.5V
= 1.8V
0.0
25
50
75
100
125
150
175
0.4
VDDB = 5.0V
VDDB = 3.3V
VDDB = 2.5V
VDDB = 1.8V
200
toc07
5
10
3.0
2.5
2.0
= 5.0V
= 3.3V
= 2.5V
= 1.8V
1.5
1.0
0.2
20
25
0
0.0
toc08
VDDA
VDDA
VDDA
VDDA
8.0
6.0
75
100
125
150
175
4.0
200
2.000
50
75
100
125
150
175
4.0
SUPPLY CURRENT (mA)
1.000
0.500
0.000
10
15
DATA RATE (Mbps)
www.maximintegrated.com
VDDB = 5.0V
VDDB = 3.3V
VDDB = 2.5V
VDDB = 1.8V
0
toc11
5
10
3.0
VDDA
VDDA
VDDA
VDDA
2.5
2.0
20
25
15
20
SIDE B SUPPLY CURRENT
vs. DATA RATE
10.0
DRIVING ONE CHANNEL ON SIDE A
CL=0pF, OTHER CHANNEL IS HIGH
MAX12935C/F
25
8.0
= 5.0V
= 3.3V
= 2.5V
= 1.8V
1.5
1.0
toc12
DRIVING ONE CHANNEL ON SIDE A
CL=15pF, OTHER CHANNEL IS HIGH
MAX12935C/F
9.0
7.0
VDDA
VDDA
VDDA
VDDA
6.0
5.0
= 5.0V
= 3.3V
= 2.5V
= 1.8V
4.0
3.0
2.0
1.0
0.0
5
0.4
200
0.5
0
0.6
DATA RATE (Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
3.5
VDDB = 5.0V
VDDB = 3.3V
VDDB = 2.5V
VDDB = 1.8V
1.500
toc09
DATA RATE (Mbps)
DRIVING ONE CHANNEL ON SIDE A
CL = 15pF, OTHER CHANNEL IS HIGH
MAX12935B/E
25
0.0
25
DATA RATE (Mbps)
2.500
20
0.2
0
toc10
15
DRIVING ONE CHANNEL ON SIDE A
CL = 0pF, OTHER CHANNEL IS HIGH
MAX12935B/E
0.8
= 5.0V
= 3.3V
= 2.5V
= 1.8V
SUPPLY CURRENT (mA)
50
10
1.0
0.0
25
5
DATA RATE (Mbps)
2.0
0
VDDB = 5.0V
VDDB = 3.3V
VDDB = 2.5V
VDDB = 1.8V
0.4
DRIVING ONE CHANNEL ON SIDE A
CL=15pF, OTHER CHANNEL IS HIGH,
MAX12934C/F
10.0
0.5
SUPPLY CURRENT (mA)
15
SIDE B SUPPLY CURRENT
vs. DATA RATE
12.0
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
VDDA
VDDA
VDDA
VDDA
0.6
0.0
0
DRIVING ONE CHANNEL ON SIDE A
CL=0pF, OTHER CHANNEL IS HIGH,
MAX12934C/F
3.5
0.8
DATA RATE (Mbps)
SIDE B SUPPLY CURRENT
vs. DATA RATE
4.0
1.0
0.0
DATA RATE (Mbps)
4.5
1.2
SUPPLY CURRENT (mA)
0
DRIVING ONE CHANNEL ON SIDE A
CL = 15pF, OTHER CHANNEL IS HIGH,
MAX12934B/E
1.4
0.6
0.2
toc06
1.6
DRIVING ONE CHANNEL ON SIDE A
CL = 0pF, OTHER CHANNEL IS HIGH,
MAX12934B/E
0.8
1.5
0.5
toc05
1.0
SUPPLY CURRENT (mA)
2.0
SUPPLY CURRENT (mA)
toc04
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNEL IS HIGH
MAX12935C/F
SUPPLY CURRENT (mA)
SIDE A SUPPLY CURRENT
vs. DATA RATE
2.5
0.0
0
25
50
75
100
125
DATA RATE (Mbps)
150
175
200
0
25
50
75
100
125
150
175
200
DATA RATE (Mbps)
Maxim Integrated │ 11
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Characteristics (continued)
(VDDA - VGNDA = +3.3V, VDDB - VGNDB = +3.3V, GNDA = GNDB, TA = +25°C, unless otherwise noted.)
15.0
35
PROPAGATION DELAY (ns)
VDDA = VDDB
INA TO OUTB
MAX1293_C/F
12.0
PROPAGATION DELAY (ns)
toc13
9.0
6.0
VDDA
VDDA
VDDA
VDDA
3.0
= 1.8V
= 2.5V
= 3.3V
= 5.5V
PROPAGATION DELAY
vs. TEMPERATURE
30.0
30
25
VDDA
VDDA
VDDA
VDDA
20
-50
-25
0
25
50
75
100
-50
125
-25
= 1.8V
= 2.5V
= 3.3V
= 5.5V
PROPAGATION DELAY
vs. VDDB VOLTAGE
50
75
MINIMUM PULSE WIDTH
toc16
100
25.0
20.0
MAX1293_C/F
10.0
5.0
125
0.0
1.5
2.5
3.5
4.5
5.5
VDDA VOLTAGE (V)
MINIMUM PULSE WIDTH
toc17
toc18
MAX1293_C/F
5ns PULSE
IN__
25.0
IN__
1V/div
20.0
MAX1293_B/E
15.0
MAX1293_B/E
40ns pulse
VDDA = 3.3V
INA TO OUTB
30.0
25
toc15
VDDB = 3.3V
INA TO OUTB
TEMPERATURE (°C)
TEMPERATURE (°C)
35.0
0
PROPAGATION DELAY
vs. VDDA VOLTAGE
35.0
VDDA = VDDB
INA TO OUTB,
MAX1293_B/E
15
0.0
PROPAGATION DELAY (ns)
toc14
PROPAGATION DELAY (ns)
PROPAGATION DELAY
vs. TEMPERATURE
1V/div
MAX1293_B/E
15.0
MAX1293_C/F
OUT__
OUT__
10.0
1V/div
1V/div
5.0
0.0
1.5
2.5
3.5
4.5
5ns/div
20ns/div
5.5
VDDB VOLTAGE (V)
EYE DIAGRAM at 200Mbps
MAX1293_C/F
CLOCK JITTER RMS ON RISING EDGE
MAX1293_C/F
toc19
CLOCK JITTER RMS ON FALLING EDGE
MAX1293_C/F
toc20
VDDB = 3.6V
toc21
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 │ 12
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Pin Configurations
+
W-16
SOIC
IC
MAX12934
+
16
GNDB
2
15
VDDA
3
IN1
GNDA
1
N.C.
W-16
SOIC
IC
MAX12935
16
GNDB
2
15
N.C.
VDDA
3
14
VDDB
OUT1
OUT1
4
13
IN1
12
OUT2
IN2
5
12
OUT2
6
11
N.C.
N.C.
6
11
N.C.
GNDA
7
10
N.C.
GNDA
7
10
N.C.
N.C.
8
9
GNDB
N.C.
8
9
GNDB
GNDA
1
N.C.
N.C.
14
VDDB
4
13
IN2
5
N.C.
I
I
Pin Description
PIN
NAME
FUNCTION
REFERENCE
3
VDDA
Power Supply for side A. Bypass VDDA with
a 0.1µF ceramic capacitor to GNDA.
GNDA
4
—
IN1
Logic input for channel 1
GNDA
—
4
OUT1
Logic output of channel 1
GNDA
5
5
IN2
Logic input for channel 2
GNDA
1, 7
1, 7
GNDA
Ground reference for side A
—
9, 16
9, 16
GNDB
Ground reference for side B
—
12
12
OUT2
Logic output of channel 2
GNDB
13
—
OUT1
Logic output of channel 1
GNDB
—
13
IN1
Logic input for channel 1
GNDB
14
14
VDDB
Power Supply for side B. Bypass VDDB with
a 0.1µF ceramic capacitor to GNDB.
GNDB
2, 6, 8, 10, 11, 15
2, 6, 8, 10, 11, 15
N.C.
Not internally connected
MAX12934
MAX12935
3
www.maximintegrated.com
—
Maxim Integrated │ 13
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Typical Operating Circuit
2.5V
3.3V
0.1µF
MICRO
CONTROLLER
VDD
0.1µF
VDDA
MAX12935
VDDB
VDD
TRANSCEIVER
A
RX
OUT1
IN1
RXD
B
Y
TX
GND
IN2
OUT2
TXD
GNDA
GNDB
GND
Detailed Description
The MAX12934/MAX12935 are a family of 2-channel
digital isolators. The MAX12934 transfers digital signals
between circuits with different power domain in one
direction, which is convenient for applications such as
digital I/O. The MAX12935 transfers digital signals in
opposite directions, which is necessary for isolated
RS-485 or other UART applications.
Devices are available in the 16-pin wide body SOIC
package and are rated for up to 5kVRMS isolation
voltage for 60 seconds. 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 data rates from DC to 25Mbps
(B/E versions) or 200Mbps (C/F versions). Each device
can be ordered with default-high or default-low outputs.
The default is the state the output assumes when the
input is not powered or if the input is open circuit.
www.maximintegrated.com
Z
The devices have two supply inputs (VDDA and VDDB)
that independently set the logic levels on either side of
device. VDDA and VDDB are referenced to GNDA and
GNDB, respectively. The MAX12934/MAX12935 family
also features a refresh circuit to ensure output accuracy
when an input remains in the same state indefinitely.
Digital Isolation
The device 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 MAX12934/MAX12935 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.
Maxim Integrated │ 14
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Unidirectional Channels
Each channel of the MAX12934/MAX12935 is
unidirectional; it only passes data in one direction, as
indicated in the functional diagram. Each device features
two unidirectional channels that operate independently
with guaranteed data rates from DC up to 25Mbps (B/E
versions), or DC to 200Mbps (C/F 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, 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.
Table 2. Output Behavior During Undervoltage Conditions
VIN_
VVDDA
VVDDB
VOUTA_
VOUTB_
1
Powered
Powered
1
1
0
Powered
Powered
0
0
X
Undervoltage
Powered
Default
Default
X
Powered
Undervoltage
Default
Default
VDDA
VDDA
2V/div
2V/div
VDDB
VDDB
OUT_A
OUT_A
OUT_B
OUT_B
200µs/div
200µs/div
Figure 2. Undervoltage Lockout Behavior (MAX1293_B/C High)
Figure 3. Undervoltage Lockout Behavior (MAX1293_B/C Low)
VDDA
2V/div
VDDA
2V/div
VDDB
VDDB
OUT_A
OUT_A
OUT_B
OUT_B
200µs/div
200µs/div
Figure 4. Undervoltage Lockout Behavior (MAX1293_E/F High)
Figure 5. Undervoltage Lockout Behavior (MAX1293_E/F Low)
www.maximintegrated.com
Maxim Integrated │ 15
MAX12934/MAX12935
Application Information
Power-Supply Sequencing
The MAX12934/MAX12935 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
recommendation 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 MAX12934/MAX12935
free from ground and signal planes. Any galvanic or
metallic connection between the field-side and logicside 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
6 and Figure 7. Please note that the data in Figure 6
and Figure 7 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 6 and Figure 7) which
is a function of Voltage and Data Rate, and the “load
current” which depends upon the type of load. Current
into a capacitive load is a function of the load capacitance,
the switching frequency, and the supply voltage.
www.maximintegrated.com
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
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.
fSW is the switching frequency (bits per second/2).
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.
IRL = VDD ÷ RL
where
IRL is the current required to drive the resistive load.
VDD is the supply voltage on the output side of the isolator.
RL is the load resistance on the isolator’s output pin.
Example (shown in Figure 8): A MAX12935F is operating
with VDDA = 2.5V, VDDB = 3.3V, channel 1 operating
at 100Mbps with a 15pF capacitive load, and channel 2
operating at 20Mbps with a 10pF capacitive load. Refer
to Table 3 and Table 4 for VDDA and VDDB supply current
calculation worksheets.
VDDA must supply:
Channel 1 is an output channel operating at 2.5V and
100Mbps, consuming 1.02mA, estimated from Figure 7.
Channel 2 is an input channel operating at 2.5V and
20Mbps, consuming 0.33mA, estimated from Figure 6.
ICL on channel 1 for 15pF capacitor at 2.5V and 100Mbps
is 1.875mA.
Total current for side A = 1.02 + 0.33 + 1.875 = 3.225mA,
typical
VDDB must supply:
Channel 1 is an input channel operating at 3.3V and
100Mbps, consuming 1.13mA, estimated from Figure 6.
Channel 2 is an output channel operating at 3.3V and
20Mbps, consuming 0.42mA, estimated from Figure 7.
ICL on channel 2 for 10pF capacitor at 3.3V and 20Mbps
is 0.33mA.
Total current for side B = 1.13 + 0.42 + 0.33 = 1.88mA,
typical
Maxim Integrated │ 16
MAX12934/MAX12935
SIDE A SUPPLY CURRENT
vs. DATA RATE
2.5
SIDE B SUPPLY CURRENT
vs. DATA RATE
4.5
DRIVING ONE CHANNEL ON SIDE A
OTHER CHANNEL IS HIGH
MAX12935C/F
3.5
1.5
1.0
VDDA
VDDA
VDDA
VDDA
0.5
= 5.0V
= 3.3V
= 2.5V
= 1.8V
toc07
DRIVING ONE CHANNEL ON SIDE A
CL=0pF, OTHER CHANNEL IS HIGH,
MAX12934C/F
4.0
SUPPLY CURRENT (mA)
2.0
SUPPLY CURRENT (mA)
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
VDDA
VDDA
VDDA
VDDA
3.0
2.5
2.0
= 5.0V
= 3.3V
= 2.5V
= 1.8V
1.5
1.0
0.5
0.0
0.0
0
25
50
75
100
125
150
175
200
0
25
50
DATA RATE (Mbps)
75
100
125
150
175
200
DATA RATE (Mbps)
Figure 6. Supply Current per Input Channel Versus Data Rate
Figure 7. Supply Current per Output Channel Versus Data Rate
2.5V
3.3V
VDDA
VDDB
MAX12935F
100Mbps
OUT1
100Mbps
IN1
15pF
20Mbps
20Mbps
IN2
OUT2
10pF
GNDA
GNDB
Figure 8. Example Circuit for Supply Current Calculation
www.maximintegrated.com
Maxim Integrated │ 17
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Table 3. Side A Supply Current Calculation Worksheet
SIDE A
VDDA = 2.5V
CHANNEL
IN/OUT
FREQUENCY
(Mbps)
1
OUT
100
2
IN
20
LOAD
TYPE
LOAD
“NO LOAD” CURRENT (mA)
LOAD CURRENT (mA)
Capacitive
15pF
1.02
2.5V x 50MHz x 15pF = 1.875mA
0.33
Total:
3.225mA
Table 4. Side B Supply Current Calculation Worksheet
SIDE B
VDDB = 3.3V
CHANNEL
IN/OUT
FREQUENCY
(Mbps)
1
IN
100
2
OUT
20
LOAD
TYPE
“NO LOAD” CURRENT (mA)
LOAD CURRENT (mA)
1.13
Capacitive
Total:
www.maximintegrated.com
LOAD
10pF
0.42
3.3V x 10MHz x 10pF = 0.33mA
1.88mA
Maxim Integrated │ 18
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Ordering Information
PART
CHANNEL
CONFIGURATION
DATA RATE
(Mbps)
DEFAULT
OUTPUT
ISOLATION
VOLTAGE
(KVRMS)
TEMP
RANGE
PIN-PACKAGE
MAX12934BAWE+*
2/0
25
High
5
-40°C to 125°C
16 Wide SOIC
MAX12934CAWE+*
2/0
200
High
5
-40°C to 125°C
16 Wide SOIC
MAX12934EAWE+*
2/0
25
Low
5
-40°C to 125°C
16 Wide SOIC
MAX12934FAWE+*
2/0
200
Low
5
-40°C to 125°C
16 Wide SOIC
MAX12935BAWE+
1/1
25
High
5
-40°C to 125°C
16 Wide SOIC
MAX12935CAWE+*
1/1
200
High
5
-40°C to 125°C
16 Wide SOIC
MAX12935EAWE+*
1/1
25
Low
5
-40°C to 125°C
16 Wide SOIC
MAX12935FAWE+*
1/1
200
Low
5
-40°C to 125°C
16 Wide SOIC
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
www.maximintegrated.com
Package Information
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
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
16 Wide
SOIC
W16MS-11
21-0042
90-0107
Maxim Integrated │ 19
MAX12934/MAX12935
Two-Channel, Fast, Low-Power,
5kVRMS Digital Isolators
Revision History
REVISION
NUMBER
REVISION
DATE
0
8/17
DESCRIPTION
Initial release
PAGES
CHANGED
—
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.
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.
© 2017 Maxim Integrated Products, Inc. │ 20