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MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
General Description
The MAXM22510 and MAXM22511 isolated RS-485/
RS-422, full-duplex, transceiver modules provide
2500VRMS (60s) of galvanic isolation between the cableside (RS-485/RS-422 driver/receiver side) and the UARTside of the device. An integrated DC-DC powers the
cable-side of the module. No external components are
required.
Isolation improves communication by breaking ground
loops and reduces noise when there are large differences
in ground potential between ports. These devices allow
for robust communication up to 500kbps (MAXM22510)
and 25Mbps (MAXM22511).
The MAXM22510/MAXM22511 operate from a single
3.3V supply on the UART-side. An integrated DC-DC
converter generates the 3.3V operating voltage for the
cable-side of the module.
The devices include one drive channel and one receive
channel. The receiver is 1/4-unit load, allowing up to 128
transceivers on a common bus.
Integrated true fail-safe circuitry ensures a logic-high on
the receiver output when inputs are shorted or open.
Undervoltage lockout disables the driver when cable-side
or UART-side power supplies are below functional levels.
The driver outputs and receiver inputs are protected
from ±35kV electrostatic discharge (ESD) to GNDB on
the cable-side, as specified by the Human Body Model
(HBM).
The MAXM22510/MAXM22511 are available in an LGA
44-pin package and operate over the -40°C to +105°C
temperature range.
Benefits and Features
●● Space Saving Solution
• Fully Integrated Module for Compact Design
●● High-Performance Transceiver Enables Flexible Designs
• Integrated DC-DC for Cable-Side Power
• Compliant with RS-485 EIA/TIA-485 Standard
• 500kbps Maximum Data Rate for the MAXM22510
• 25Mbps Maximum Data Rate for the MAXM22511
• Allows Up to 128 Devices on the Bus
●● Integrated Protection Ensures for Robust Communication
• ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs
• 2.5kVRMS Withstand Isolation Voltage for 60
Seconds (VISO)
• 630VPEAK Maximum Repetitive Peak-Isolation
Voltage (VIORM)
• 445VRMS Maximum Working-Isolation Voltage
(VIOWM)
• Withstands ±10kV Surge per IEC 61000-4-5
• Thermal Shutdown
Safety Regulatory Approvals
●● UL According to UL1577
●● cUL According to CSA Bulletin 5A
Applications
●●
●●
●●
●●
●●
Industrial Automation
Programmable Logic Controllers
HVAC
Power Meters
Building Automation
Functional Diagram
GNDA
MAXM22510
MAXM22511
DC-DC
VRECT
VLDO
Ordering Information appears at end of data sheet.
VDDB
VDDA
LDO
RS-485
TRANSCEIVER
SD
RXD
RE
DE
TXD
SBA
GNDA
19-100335; Rev 2; 6/19
GNDB
A
B
Z
Y
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Absolute Maximum Ratings
VDDA to GNDA ........................................................-0.3V to +4V
VDDB to GNDB.........................................................-0.3V to +6V
VRECT, VLDO to GNDB............................................-0.3V to +8V
SD, TXD, DE, RE to GNDA .....................................-0.3V to +6V
SBA, RXD to GNDA ............................... -0.3V to (VDDA + 0.3V)
A, B, Y, Z to GNDB....................................................-8V to +13V
Short-Circuit Duration (RXD, SBA to GNDA,
A, B, Y, Z ,VDDB to GNDB).....................................Continuous
Continuous Power Dissipation (TA = +70°C)
44-pin LGA (derate 28.6mW/°C above +70°C)..........2286mW
Operating Temperature Range.......................... -40°C to +105°C
Junction Temperature.......................................................+125°C
Storage Temperature Range............................. -65°C to +125°C
Soldering Temperature (reflow)........................................+245°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 Information
PACKAGE TYPE: 44 LGA
Package Code
L44119M+1
Outline Number
21-100226
Land Pattern Number
90-100107
THERMAL RESISTANCE, FOUR-LAYER BOARD
Junction to Ambient (θJA)
48°C/W
Junction to Case (θJC) (top)
39.2°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 = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA – VGNDA = 3.3V, VGNDA =
VGNDB, and TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
3.6
V
25
44
mA
0.01
10
μA
POWER
Supply Voltage
Supply Current
Shutdown Supply Current
VDDA
IDDA
ISD
3.0
VDDA = 3.3V, DE = high, RE = TXD =
low, SD = low, RXD unconnected,
no load
VDDA = 3.3V, SD = high
Undervoltage Lockout
Threshold
VUVLOA
VDDA rising
2.55
2.7
2.85
VUVLOB
VDDB rising
2.55
2.7
2.85
Undervoltage Lockout
Threshold Hysteresis
VUVHYSTA
200
VUVHYSTB
200
Unregulated DC-DC Output
Voltage
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VRECT
VDDA = 3.3V, DE = high, RE = TXD =
low, SD = low, no load
6
V
mV
V
Maxim Integrated │ 2
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
DC Electrical Characteristics (continued)
(VDDA – VGNDA = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA – VGNDA = 3.3V, VGNDA =
VGNDB, and TA = +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
3.0
3.3
3.6
V
LDO
LDO Output Voltage
VDDB
LDO Current Limit
300
Load Regulation
VLDO = 3.3V, ILOAD = -20mA to -40mA
0.19
Line Regulation
VLDO = 3.3V to 7.5V, ILOAD = -20mA
0.12
Dropout Voltage
VLDO = 3.18V, IDDB = -120mA
100
Load Capacitance
Nominal value (Note 3)
1
mA
1.7
mV/mA
mV/V
180
mV
10
µF
LOGIC INTERFACE (TXD, RXD, DE, RE, SD, SBA)
0.7 x
VDDA
Input High Voltage
VIH
RE, TXD, DE, SD to GNDA
Input Low Voltage
VIL
RE, TXD, DE, SD to GNDA
VHYS
RE, TXD, DE, SD to GNDA
220
mV
Input Capacitance
CIN
RE, TXD, DE, SD, f = 1MHz
2
pF
Input Pullup Current
IPU
TXD, SD
-10
-4.5
-1.5
µA
Input Pulldown Current
IPD
DE, RE
1.5
4.5
10
µA
SBA Pullup Resistance
RSBA
3
5
8
kΩ
Output Voltage High
VOH
Output Voltage Low
VOL
Input Hysteresis
Short-Circuit Output Pullup
Current
ISH_PU
Short-Circuit Output Pulldown
Current
ISH_PD
Three-State Output Current
IOZ
RXD to GNDA, IOUT = -4mA
V
0.8
VDDA
-0.4
V
RXD to GNDA, IOUT = 4mA
0.40
SBA to GNDA, IOUT = 4mA
0.45
0V ≤ VRXD ≤ VDDA, (VA - VB) > -10mV,
RE = low
-42
42
0V ≤ VSBA ≤ VDDA, SBA is asserted
60
-1
RL = 54Ω, TXD = high or low, Figure 1a
1.5
RL = 100Ω, TXD = high or low, Figure 1a
2.0
-7V ≤ VCM ≤ +12V, Figure 1b
1.5
V
mA
0V ≤ VRXD ≤ VDDA, (VA - VB) < -200mV,
RE = low
0V ≤ VRXD ≤ VDDA, RE = high
V
+1
mA
µA
DRIVER
Differential Driver Output
Change in Magnitude of Differential Driver Output Voltage
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|VOD|
ΔVOD
RL = 100Ω or 54Ω, Figure 1a (Note 4)
V
5
0.2
V
Maxim Integrated │ 3
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
DC Electrical Characteristics (continued)
(VDDA – VGNDA = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA – VGNDA = 3.3V, VGNDA =
VGNDB, and TA = +25°C.) (Notes 1, 2)
PARAMETER
Driver Common-Mode Output
Voltage
Change in Magnitude of
Common-Mode Voltage
SYMBOL
VOC
ΔVOC
CONDITIONS
MIN
RL = 100Ω or 54Ω, Figure 1a
TYP
MAX
UNITS
VDDB/ 2
3
V
0.2
V
RL = 100Ω or 54Ω, Figure 1a (Note 4)
GNDB ≤ VOUT ≤ +12V, output low
(Note 5)
+30
+250
-7V ≤ VOUT ≤ VDDB, output high
(Note 5)
-250
-30
Driver Short-Circuit Output
Current
IOSD
Single-Ended Driver Output
Voltage High
VOH
Y and Z outputs, IY,Z = -20mA
Single-Ended Driver Output
Voltage Low
VOL
Y and Z outputs, IY,Z = +20mA
Differential Driver Output
Capacitance
COD
DE = RE = high, f = 4MHz
Input Current (A and B)
IA, IB
DE = low, VDDB = VIN = +12V
GNDB or 3.6V
VIN = -7V
-200
Receiver Differential Threshold
Voltage
VTH
-7V ≤ VCM ≤ +12V
-200
mA
2.2
V
0.8
12
V
pF
RECEIVER
Receiver Input Hysteresis
ΔVTH
Receiver Input Resistance
RIN
-7V ≤ VCM ≤ +12V, DE = low
CA,B
Measured between A and B, DE = RE =
low, f = 6MHz
Differential Input Capacitance
+250
VCM = 0V
-120
20
48
-10
µA
mV
mV
kΩ
12
pF
+160
°C
15
°C
PROTECTION
Thermal Shutdown Threshold
TSHDN
Thermal Shutdown Hysteresis
THYST
Temperature Rising
Human Body Model
±35
IEC 61000-4-2 Air Gap Discharge
±18
IEC 61000-4-2 Contact Discharge
±8
ESD Protection
(A, B, Y, Z Pins to GNDA)
Human Body Model
±6
330pF capacitor from GNDB to GNDA
±20
ESD Protection (All Other Pins)
Human Body Model
±4
ESD Protection
(A, B, Y, Z Pins to GNDB)
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kV
kV
kV
Maxim Integrated │ 4
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Switching Electrical Characteristics (MAXM22510)
(VDDA – VGNDA = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA – VGNDA = 3.3V, VGNDA =
VGNDB, and TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC
Common Mode Transient
Immunity
CMTI
Glitch Rejection
(Note 6)
TXD, DE, RXD
35
10
17
kV/μs
29
ns
DRIVER
tDPLH, tDPHL
RL = 54Ω, CL = 50pF Figure 2 and
Figure 3
1040
ns
Differential Driver Output Skew
|tDPLH - tDPHL|
tDSKEW
RL = 54Ω, CL = 50pF, Figure 2 and
Figure 3
144
ns
Driver Differential Output Rise
or Fall Time
tLH, tHL
RL = 54Ω, CL = 50pF, Figure 2 and
Figure 3
900
ns
Maximum Data Rate
DRMAX
Driver Propagation Delay
500
kbps
Driver Enable to Output High
tDZH
RL = 110Ω, CL = 50pF, Figure 4
2540
ns
Driver Enable to Output Low
tDZL
RL = 110Ω, CL = 50pF, Figure 5
2540
ns
Driver Disable Time from Low
tDLZ
RL = 110Ω, CL = 50pF, Figure 5
140
ns
Driver Disable Time from High
tDHZ
RL = 110Ω, CL = 50pF, Figure 4
140
ns
tRPLH, tRPHL
CL = 15pF, Figure 6 and Figure 7
(Note 7)
240
ns
Receiver Output Skew
|tRPLH - tRPHL|
tRSKEW
CL = 15pF, Figure 6 and Figure 7
(Note 7)
34
ns
Maximum Data Rate
DRMAX
RECEIVER
Receiver Propagation Delay
500
Receiver Enable to Output High
tRZH
Receiver Enable to Output Low
tRZL
RL = 1kΩ, CL = 15pF, S2 closed,
Figure 8
RL = 1kΩ, CL = 15pF, S1 closed,
Figure 8
Receiver Disable Time From Low
tRLZ
Receiver Disable Time From High
tRHZ
kbps
20
ns
30
ns
RL = 1kΩ, CL = 15pF, S1 closed,
Figure 8
20
ns
RL = 1kΩ, CL = 15pF, S2 closed,
Figure 8
20
ns
POWER
VDDB Startup Delay After
Shutdown
No load on VDDB, SD falling
165
µs
Time to Shutdown
SD rising
80
ns
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Maxim Integrated │ 5
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Switching Electrical Characteristics (MAXM22511)
(VDDA – VGNDA = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA – VGNDA = 3.3V, VGNDA =
VGNDB, and TA = +25°C.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC
Common Mode Transient
Immunity
CMTI
Glitch Rejection
(Note 6)
TXD, DE, RXD
35
10
17
kV/μs
29
ns
DRIVER
tDPLH, tDPHL
RL = 54Ω, CL = 50pF, Figure 2 and
Figure 3
65
ns
Differential Driver Output Skew
|tDPLH - tDPHL|
tDSKEW
RL = 54Ω, CL = 50pF, Figure 2 and
Figure 3
7
ns
Driver Differential Output Rise
or Fall Time
tLH, tHL
RL = 54Ω, CL = 50pF, Figure 2 and
Figure 3
10
ns
Maximum Data Rate
DRMAX
Driver Propagation Delay
25
Mbps
Driver Enable to Output High
tDZH
RL = 110Ω, CL = 50pF, Figure 4
80
ns
Driver Enable to Output Low
tDZL
RL = 110Ω, CL = 50pF, Figure 5
80
ns
Driver Disable Time from Low
tDLZ
RL = 110Ω, CL = 50pF, Figure 5
80
ns
Driver Disable Time from High
tDHZ
RL = 110Ω, CL = 50pF, Figure 4
80
ns
tRPLH, tRPHL
CL = 15pF, Figure 6 and Figure 7
(Note 7)
65
ns
Receiver Output Skew
|tRPLH - tRPHL|
tRSKEW
CL = 15pF, Figure 6 and Figure 7
(Note 7)
7
ns
Maximum Data Rate
DRMAX
RECEIVER
Receiver Propagation Delay
25
Receiver Enable to Output High
tRZH
Receiver Enable to Output Low
tRZL
RL = 1kΩ, CL = 15pF, S2 closed,
Figure 8
RL = 1kΩ, CL = 15pF, S1 closed,
Figure 8
Receiver Disable Time From Low
tRLZ
Receiver Disable Time From High
tRHZ
Mbps
20
ns
30
ns
RL = 1kΩ, CL = 15pF, S1 closed,
Figure 8
20
ns
RL = 1kΩ, CL = 15pF, S2 closed,
Figure 8
20
ns
POWER
VDDB Startup Delay After
Shutdown
No load on VDDB, SD falling
165
µs
Time to Shutdown
SD rising
80
ns
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design and characterization.
Note 2: 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 3: Not production tested. Guaranteed by design and characterization.
Note 4: ΔVOD and ΔVOC are the changes in |VOD| and VOC, respectively, when the TXD input changes state.
Note 5: The short circuit output current applies to the peak current just prior to current limiting.
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Maxim Integrated │ 6
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Insulation Characteristics
PARAMETER
Partial Discharge Test Voltage
SYMBOL
CONDITIONS
VALUE
UNITS
VPR
Method B1 = VIORM x 1.875 (t = 1s, partial
discharge < 5pC) (Note 3)
1182
VP
Maximum Repetitive Peak Withstand
Voltage
VIORM
(Note 8)
630
VP
Maximum Working Isolation Voltage
VIOWM
(Note 8)
445
VRMS
Maximum Transient Isolation Voltage
VIOTM
3600
VP
Maximum Withstand Isolation Voltage
VISO
2500
VRMS
Maximum Surge Isolation Voltage
Insulation Resistance
t = 60s, f = 60Hz (Notes 8,9)
VIOSM
IEC 61000-4-5, 1.2/50μs
10
kV
RS
TA = +150°C, VIO = 500V
>109
Ω
TA = +25°C, VIO = 500V
>1012
Ω
Insulation Resistance
RIO
Barrier Capacitance Input to Output
CIO
6
pF
Creepage Distance
CPG
8
mm
Clearance Distance
CLR
8
mm
0.015
mm
Internal Clearance
Comparitive Tracking Resistance
Index
Distance through insulation
CTI
Material Group II (IEC 60112)
Climatic Category
Pollution Degree (DIN VDE 0110,
Table 1)
550
40/125/21
2
Note 6: CMTI is the maximum sustainable common-mode voltage slew rate while maintaining the correct output states. CMTI
applies to both rising and falling common-mode voltage edges. Tested with the transient generator connected between
GNDA and GNDB. VCM = 1kV.
Note 7: Capacitive load includes test probe and fixture capacitance.
Note 8: VIORM, VIOWM, and VISO are defined by the IEC 60747-5-5 standard.
Note 9: As required by UL1577, each IC is proof tested for the 2500 VRMS rating by applying the equivalent positive and negative
peak voltage, multiplied by an acceleration factor of 1.2 (±4243V) for 1 second.
Safety Regulatory Approvals
UL
The MAXM22510/MAXM22511 are certified under UL1577. For more details, refer to File E351759.
Rated up to 2500VRMS for single protection.
cUL (Equivalent to CSA notice 5A)
The MAXM22510/MAXM22511 are certified up to 2500VRMS for single protection. For more details, refer to File E351759.
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Maxim Integrated │ 7
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
375Ω
Y
Y
RL
2
VOD
VOD
60Ω
+
-
VOC
RL
2
VCM
Z
Z
375Ω
(b)
(a)
Figure 1. Driver DC Test Load
TXD
Y
Z
VOD
RL
CL
GNDA
Figure 2. Driver Timing Test Circuit
tLH P 3ns, tHL P 3ns
VDDA
50%
TXD
50%
GNDA
1/2 VO
tDPHL
tDPLH
Z
Y
1/2 VO
VO
VDIFF = VY - VZ
VO
80%
80%
VDIFF
0
20%
20%
tLH
-VO
tHL
tDSKEW = |tDPLH - tDPHL|
Figure 3. Driver Propagation Delays
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Maxim Integrated │ 8
MAXM22510/MAXM22511
Y
GNDA OR VDDA TXD D
Z
DE
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
S1
VDDA
OUT
CL
50pF
DE
RL = 500I
50%
250mV
OUT
GENERATOR
50%
GNDB
50I
GNDA
tDZH
tDHZ
VOH
GNDB
GNDA
Figure 4. Driver Enable and Disable Times (tDHZ, tDZH)
VDDB
GNDA OR VDDA TXD D
Y
Z
DE
GENERATOR
RL = 500I
S1
OUT
CL = 50pF
GNDB
50I
GNDA
VDDA
DE
50%
GNDA
tDZL
tDLZ
OUT
VDDB
50%
250mV
VOL
Figure 5. Driver Enable and Disable Times (tDZL, tDLZ)
DIFF
GENERATOR
A
R
VID
RO
B
Figure 6. Receiver Propagation Delay Test Circuit
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Maxim Integrated │ 9
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
tLH P 3ns, tHL P 3ns
A
1V
B
-1V
tRPHL
tRPLH
VDDA
2
RXD
VOH
VDDA
2
VOL
tRSKEW = |tRPHL - tRPLH|
Figure 7. Receiver Propagation Delays
+1.5V
S3
-1.5V
VID
GNDB
GENERATOR
R
RE
RXD
RL
1kI
S1
VDDA
S2
CL
15pF
GNDA
50I
GNDA
VDDA
VDDA
50%
RE
S1 OPEN
S2 CLOSED
GNDA S3 = +1.5V
50%
RE
GNDA
tRZL
tRZH
VOH
VDDA
2
GNDA
RXD
VDDA
50%
RE
VDDA
2
RXD
S1 OPEN
S2 CLOSED
S3 = +1.5V
VDDA
RE
50%
GNDA
GNDA
RXD
VDDA
VOL
S1 CLOSED
S2 OPEN
S3 = -1.5V
tRLZ
tRHZ
0.25V
S1 CLOSED
S2 OPEN
S3 = -1.5V
VDDA
VOH
RXD
GNDA
0.25V
VOL
Figure 8. Receiver Enable and Disable Times
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Maxim Integrated │ 10
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Typical Operating Characteristics
(VDDA – VGNDA = 3.3V, VGNDA = VGNDB, and TA = +25°C, unless otherwise noted.)
toc01
0.50
30
VRXD (V)
IDDA (mA)
25
20
15
toc02
3.00
0.40
2.70
0.30
0.25
-40 -25 -10 5
20 35 50 65 80 95 110
1.80
1.20
0.90
0.60
0.05
0.00
2.10
1.50
0.10
NO SWITCHING
NO LOAD BETWEEN Y AND Z
0.30
RXD IS LOW
0
5
TEMPERATURE (°C)
10
15
20
0.00
25
toc05
0.9
0.8
2.70
VY,Z (V)
VY,Z (V)
0.6
0.5
2.10
1.80
0.60
0.30
OUTPUT IS LOW
0
25
50
75
100
125
0.00
RL = 54Ω
CL = 50pF
20 35 50 65 80 95 110
TEMPERATURE (°C)
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0
-25
-50
-75
-100
-125
SOURCE CURRENT (mA)
MAXM22511 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
toc08
80
MAXM22511 DRIVER ENABLE/DISABLE
DELAY vs. TEMPERATURE
toc09
70
tRPLH
tRPHL
ENABLE/DISABLE DELAY (ns)
PROPAGATION DELAY (ns)
PROPAGATION DELAY (ns)
SINK CURRENT (mA)
tDPHL
toc06
OUTPUT IS HIGH
0.90
0.1
tDPLH
-25
1.20
0.2
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-20
1.50
0.3
toc07
-15
2.40
0.4
MAXM22511 DRIVER PROPAGATION
DELAY vs. TEMPERATURE
-10
DRIVER OUTPUT VOLTAGE
vs. SOURCE CURRENT
3.30
3.00
0.7
-40 -25 -10 5
-5
SOURCE CURRENT (mA)
DRIVER OUTPUT VOLTAGE
vs. SINK CURRENT
1.0
65
60
55
50
45
40
35
30
25
20
15
10
5
0
RXD IS HIGH
0
SINK CURRENT (mA)
0.0
toc03
2.40
0.35
0.15
5
RXD OUTPUT VOLTAGE
vs. SOURCE CURRENT
3.30
0.45
0.20
10
0
RXD OUTPUT VOLTAGE
vs. SINK CURRENT
VRXD (V)
35
VDDA SUPPLY CURRENT
vs. TEMPERATURE
60
tDLZ
tDZH
50
40
tDZL
tDHZ
30
20
10
CL = 15pF
-40 -25 -10 5
20 35 50 65 80 95 110
TEMPERATURE (°C)
0
-40 -25 -10 5
20 35 50 65 80 95 110
TEMPERATURE (°C)
Maxim Integrated │ 11
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Typical Operating Characteristics (continued)
(VDDA – VGNDA = 3.3V, VGNDA = VGNDB, and TA = +25°C, unless otherwise noted.)
MAXM22511
RECEIVER PROPAGATION DELAY
toc10
120
A
TXD
2V/div
0V
100
1V/div
B
Y
1V/div
A-B
2V/div
Z
RL = 54Ω
CL = 50pF
toc11
IDDA (mA)
MAXM22511
DRIVER PROPAGATION DELAY
Y-Z
0V
2V/div
VDDA SUPPLY
CURRENT vs. DATA RATE
80
RL = 54Ω
60
RL = 120Ω
RXD
2V/div
40
0V
20
toc12
DE = VDDA
RE = GNDA
RL BETWEEN Y AND Z
NO LOAD
CL = 15pF
10ns/div
0
0.01
10ns/div
0.1
1
10
100
DATA RATE (MHz)
VRECT VOLTAGE
vs. VDDA VOLTAGE
toc13
6.0
5.5
RL = 120Ω
VRECT (V)
VDDB (V)
RL = 54Ω
5.0
NO LOAD
4.5
4.0
DE = VDDA
RE = GNDA
TXD = GNDA
RL IS BETWEEN Y AND Z
3.5
3.0
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.00
VDDB VOLTAGE
vs. VDDA VOLTAGE
DE = VDDA
RE = GNDA
TXD = GNDA
RL IS BETWEEN Y AND Z
RL = 120Ω
NO LOAD
3.0
3.1
3.2
VDDA (V)
toc15
3.6
3.0
3.5
2.7
3.4
2.1
VDDB (V)
VDDB (V)
2.4
1.8
1.5
1.2
3.4
3.5
3.6
3.3
VDDB VOLTAGE
vs. TEMPERATURE
toc16
DE = VDDA
RE = GNDA
TXD = GNDA
RL IS BETWEEN Y AND Z
RL = 120Ω
RL = 54Ω
NO LOAD
3.2
0.9
VDDA = 3.3V
DE = GNDA
RE = VDDA
NO LOAD BETWEEN Y AND Z
0.6
0.3
0.0
RL = 54Ω
VDDA (V)
VDDB VOLTAGE
vs. LOAD CURRENT
3.3
3.3
toc14
0
50
100
150
3.1
3.0
200
LOAD CURRENT (mA)
www.maximintegrated.com
250
300
-40 -25 -10 5
20 35 50 65 80 95 110
TEMPERATURE (°C)
Maxim Integrated │ 12
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Typical Operating Characteristics (continued)
(VDDA – VGNDA = 3.3V, VGNDA = VGNDB, and TA = +25°C, unless otherwise noted.)
VDDA SUPPLY CURRENT
vs. VDDB LOAD CURRENT
250
VDDB SOFT SHORT
TA = -40°C
200
IDDA (mA)
toc17
TA = +105°C
150
toc19
VDDB
2V/div
VDDB
2V/div
0V
0V
TA = +25°C
ILOAD
200mA/div
TA = +85°C
100
DE = VDDA,RE = GNDA
NO SWITCHING
SD = GNDA
NO LOAD BETWEEN Y AND Z
50
0
VDDB HARD SHORT
toc18
0
20
40
60
80
IDDB (mA)
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100
120
ILOAD
200mA/div
0mA
120mA TO 300mA LOAD STEP
100µs/div
0mA
120mA LOAD ON VDDB
4ms/div
Maxim Integrated │ 13
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Pin Configuration
TOP VIEW
GNDA
+
1
44 GNDB
GNDA
2
43 GNDB
GNDA
3
42 GNDB
GNDA
4
41 GNDB
GNDA
5
40 GNDB
GNDA
6
39 GNDB
GNDA
7
38 GNDB
GNDA
8
37 GNDB
GNDA
9
36 GNDB
GNDA 10
35 GNDB
N.C. 11
N.C. 12
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MAXM22510
MAXM22511
34 N.C.
33 N.C.
GNDA 13
32 GNDB
GNDA 14
31 B
I.C. 15
30 A
VDDA 16
29 VDDB
SBA 17
28 VDDB
RXD 18
27 GNDB
RE 19
26 Z
TXD 20
25 Y
SD 21
24 VRECT
DE 22
23 VLDO
Maxim Integrated │ 14
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Pin Description
PIN
NAME
REFERENCE
FUNCTION
1-10,
13, 14
GNDA
―
UART-side/Side A Ground. GNDA is the ground reference for digital signals and the UARTside/side A power supply.
11, 12,
33, 34
N.C.
―
Not Connected. Not internally connected.
15
I.C.
GNDA
Internally Connected. Leave I.C. unconnected.
16
VDDA
GNDA
UART-side/Side A Power Input. Apply a 3.3V supply voltage to VDDA.
17
SBA
GNDA
Cable-side/Side B Active Indicator Open-Drain Output. SBA asserts low when the cable-side/
side B is powered and working. SBA has an internal 5kΩ pullup resistor to VDDA. SBA is
high impedance when the device is in shutdown (SD is high).
18
RXD
GNDA
Receiver Data Output. Drive RE low to enable RXD. With RE low, RXD is high when (VA
– VB) > -10mV and is low when (VA – VB) < -200mV. RXD is high when VDDB is less than
VUVLOB. RXD is high-impedance when RE is high or when SD is high.
19
RE
GNDA
Receiver Output Enable. Drive RE low or connect to GNDA to enable RXD. Drive RE high to
disable RXD. RXD is high-impedance when RE is high. RE has an internal 4.5µA pulldown to
GNDA.
20
TXD
GNDA
Driver Input. With DE high, a low on TXD forces the noninverting output (Y) low and the
inverting output (Z) high. Similarly, a high on TXD forces the noninverting output high and the
inverting output low. TXD has an internal 4.5µA pull-up to VDDA.
21
SD
GNDA
Shutdown Input. Drive SD low for normal operation. Drive SD high to force the part into
shutdown mode. When SD is high, the logic inputs/outputs are in a reset state and the cableside/side B of the device is unpowered. Do not leave SD disconnected.
22
DE
GNDA
Driver Output Enable. Drive DE high to enable bus driver outputs Y and Z on the cable-side/
side B of the device. Drive DE low to disable Y and Z. Y and Z are high impedance when DE
is low. DE has an internal 4.5µA pull-down to GNDA.
23
VLDO
GNDB
Cable-side/Side B LDO Input. Connect VLDO to VRECT to power the cable-side of the
device.
24
VRECT
GNDB
Cable-side/Side B DC-DC Unregulated Output. Connect VRECT to VLDO to power the cableside of the device.
25
Y
GNDB
Noninverting Driver Output
26
Z
GNDB
Inverting Driver Output
27, 32,
35-44
GNDB
―
28, 29
VDDB
GNDB
Cable-Side/Side B LDO Power Output. VDDB is the output of the internal LDO.
30
A
GNDB
Noninverting Receiver Input
31
B
GNDB
Inverting Receiver Input
www.maximintegrated.com
Cable-Side/Side B Ground. GNDB is the ground reference for the internal LDO and the RS485/RS-422 bus signals.
Maxim Integrated │ 15
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Function Tables
TRANSMITTING
INPUTS
VDDA
VDDB
SD
≥ VUVLOB
≥ VUVLOA
OUTPUTS
DE*
TXD
Y
Z
1
1
0
0
0
1
0
X
High-Z
High-Z
X
X
High-Z
High-Z
1
0
< VUVLOB
< VUVLOA
X
0
X
X
High-Z
High-Z
X
X
1
X
X
High-Z
High-Z
*Note: Drive DE low to disable the transmitter outputs. Drive DE high to enable the transmitter outputs. DE has an internal pulldown
to GNDA.
X = Don’t care
RECEIVING (DE = 0)
INPUTS
VDDA
VDDB
≥ VUVLOA
RE*
SD
≥ VUVLOB
OUTPUTS
0
0
(VA- VB)
RXD
> -10mV
1
< -200mV
0
Open/Short
1
1
X
High-Z
< VUVLOB
0
0
X
1
< VUVLOA
< VUVLOB
0
0
X
1**
X
X
1
X
X
High-Z
*Note: Drive RE high to disable the receiver output. Drive RE low to enable to receiver output. RE has an internal pulldown to GNDA.
**Note: RXD goes high impedance when VDDA falls below 1.6V (typ).
X = Don’t care
SBA
VDDA
VDDB
SD
SBA
< VUVLOA
< VUVLOB
0
High
< VUVLOB
0
High
≥ VUVLOB
0
Low
X
1
High-Z
≥ VUVLOA
X
X = Don’t care
www.maximintegrated.com
Maxim Integrated │ 16
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Detailed Description
The MAXM22510/MAXM22511 isolated RS-485/RS-422
full-duplex transceiver modules provide 2500VRMS
(60s) of galvanic isolation between the RS-485/RS-422
cable-side of the transceiver and the UART-side. These
integrated modules require no external components and
no external isolated power supply for the cable-side.
These transceivers allow up to 500kbps (MAXM22510) or
25Mbps (MAXM22511) communication across an isolation barrier when a large potential exists between grounds
on each side of the barrier.
Data Isolation
Data isolation is achieved using high-voltage capacitors
that allow data transmission between the UART-side and
the RS-485/RS-422 cable-side of the transceiver.
Integrated DC-DC for Isolated Power
Power isolation is achieved with an integrated DC-DC
and LDO. A single 3.3V supply on the UART-side of the
device is used to generate a regulated 3.3V supply for
the cable-side.
The internal transformer used to transfer isolated power in
the MAXM22510/MAXM22511 is based on a ferrite core
to help reduce unwanted EMI emissions.
No power is transferred from the UART-side to the cableside when the shutdown pin (SD) is high.
True Fail-Safe
The devices guarantee a logic-high on the receiver output
when the receiver inputs are shorted or open, or when
connected to a terminated transmission line with all
drivers disabled. The receiver threshold is fixed between
-10mV and -200mV. If the differential receiver input voltage
(VA – VB) is greater than or equal to -10mV, RXD is logichigh. In the case of a terminated bus with all transmitters
www.maximintegrated.com
disabled, the receiver’s differential input voltage is pulled
to zero by the termination resistors. Due to the receiver
threshold of the devices, this results in a logic-high at
RXD.
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or bus contention.
The first, a current limit on the output stage, provides
immediate protection against short circuits over the entire
common-mode voltage range. The second, a thermalshutdown circuit, forces the driver outputs into a
high-impedance state if the die temperature exceeds
+160°C (typ).
Thermal Shutdown
The devices are protected from overtemperature
damage by integrated thermal-shutdown circuitry. When
the junction temperature (TJ) exceeds +160°C (typ), the
driver outputs and RXD are high-impedance, and VDDB
falls to 0V. The device resumes normal operation when TJ
falls below +145°C (typ).
Applications Information
128 Transceivers on the Bus
The standard RS-485 receiver input impedance is one
unit load. A standard driver can drive up to 32 unit-loads.
The MAXM22510/MAXM22511 transceivers have a 1/4unit load receiver, which allows up to 128 transceivers,
connected in parallel, on one communication line. Connect
any combination of these devices, and/or other RS-485
devices, for a maximum of 32 unit-loads to the line.
Typical Application
The MAXM22510/MAXM22511 full-duplex transceivers are
designed for bidirectional data communications on multipoint bus transmission lines. Figure 9 and Figure 10 show
Maxim Integrated │ 17
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
SLAVE
RXD
RE
TXD
DE
Y
RS-485 TRANSCEIVER
RS-485 TRANSCEIVER
MASTER
A
120Ω
120Ω
Z
B
B
B
A
RS-485 TRANSCEIVER
RXD
RE
TXD
DE
A
RS-485 TRANSCEIVER
MAXM22510
MAXM22511
INTEGRATED
ISOLATION
BARRIER
SLAVE
SLAVE
DE
TXD RE
RXD
DE
TXD RE
RXD
Figure 9. Typical Isolated Full-Duplex RS-485/RS-422 Application
VRECT
VDDA
LDO
RXD
RE
TXD
DE
SD
MAXM22510
MAXM22511
1
VLDO
VDDB
VDDB
A
Y
120Ω
120Ω
Z
B
A
Y
120Ω
B
2
120Ω
Z
VRECT
LDO
VDDA
DC-DC
RS-485 TRANSCEIVER
RS-485 TRANSCEIVER
DC-DC
VLDO
RXD
RE
TXD
DE
SD
MAXM22510
MAXM22511
3
4
Figure 10. Typical Isolated Point-to-Point Application
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Maxim Integrated │ 18
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
typical network application circuits. To minimize reflections,
the bus should be terminated at both ends in its characteristics
impedance, and stub lengths off the main line should be
kept as short as possible.
Layout Considerations
It is recommended to design an isolation, or “keep-out,”
channel underneath the isolator that is free from ground and
signal planes. Any galvanic or metallic connection between
the cable-side and UART-side will defeat the isolation.
Route important signal lines close to the ground plane
to minimize possible external influences. On the cableside of the devices, it is good practice to have the bus
connectors and termination resistor as close as possible
to the I/O pins.
Extended ESD Protection
ESD protection structures are incorporated on all pins to
protect against electrostatic discharge encountered during
handling and assembly. The driver outputs and receiver
inputs of the devices have extra protection against static
electricity to the cable-side ground reference. The ESD
structures withstand high-ESD events during normal
operation and when powered down. After an ESD event,
the devices keep working without latch-up or damage.
Optionally, place a 330pF Y capacitor between GNDA
and GNDB for improved cable-side to UART-side ESD
protection.
ESD protection can be tested in various ways. The
transmitter outputs and receiver inputs of the MAXM22510/
MAXM22511 are characterized for protection to the cableside ground (GNDB) to the following limits:
●●
±35kV HBM
●●
±18kV using the Air-Gap Discharge method specified
in IEC 61000-4-2
●●
±8kV using the Contact Discharge method specified
in IEC 61000-4-2
www.maximintegrated.com
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Human Body Model (HBM)
Figure 11 shows the HBM test model, while Figure
12 shows the current waveform it generates when
discharged in a low-impedance state. This model
consists of a 100pF capacitor charged to the ESD voltage of
interest, which is then discharged into the test device
through a 1.5kΩ resistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. However, it does not
specifically refer to integrated circuits. The devices help in
designing equipment to meet IEC 61000-4-2 without the
need for additional ESD protection components.
The major difference between tests done using the HBM
and IEC 61000-4-2 is higher peak current in IEC 61000-4-2
because series resistance is lower in the IEC 61000-4-2
model. Hence, the ESD withstand voltage measured to
IEC 61000-4-2 is generally lower than that measured
using the HBM.
Figure 13 shows the IEC 61000-4-2 model and Figure
14 shows the current waveform for IEC 61000-4-2 ESD
Contact Discharge Test.
Maxim Integrated │ 19
MAXM22510/MAXM22511
RC
1MΩ
CHARGE-CURRENTLIMIT RESISTOR
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
RD
1500Ω
IP 100%
90%
DISCHARGE
RESISTANCE
Ir
AMPS
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
36.8%
10%
0
0
Figure 11. Human Body ESD Test Model
CHARGE-CURRENTLIMIT RESISTOR
HIGHVOLTAGE
DC
SOURCE
Cs
150pF
tDL
CURRENT WAVEFORM
Figure 12. Human Body Current Waveform
RD
330Ω
I
100%
90%
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
TIME
tRL
IPEAK
RC
50MΩ TO 100MΩ
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
DEVICE
UNDER
TEST
10%
tr = 0.7ns TO 1ns
t
30ns
60ns
Figure 13. IEC 61000-4-2 ESD Test Model
www.maximintegrated.com
Figure 14. IEC 61000-4-2 ESD Generator Current Waveform
Maxim Integrated │ 20
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Typical Application Circuits
VLDO
VRECT
VDDA
VDDB
GPIO
RXD
GPIO
uC
TXD
GPIO
DC-DC
SD
LDO
SBA
A
RXD
RS-485
TRANSCEIVER
GPIO
RE
TXD
B
Y
Z
DE
MAXM22510
MAXM22511
GNDA
GNDB
ISOLATION BARRIER
FULL DUPLEX CONFIGURATION
VLDO
VRECT
VDDA
VDDB
GPIO
RXD
GPIO
uC
TXD
GPIO
SD
DC-DC
LDO
SBA
A
RXD
RS-485
TRANSCEIVER
GPIO
RE
TXD
DE
MAXM22510
MAXM22511
GNDA
B
Y
Z
GNDB
ISOLATION BARRIER
HALF DUPLEX CONFIGURATION
www.maximintegrated.com
Maxim Integrated │ 21
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Ordering Information
TEMP RANGE
PIN-PACKAGE
MAXM22510GLH+
PART
-40°C to +105°C
44 LGA
MAXM22510GLH+T
-40°C to +105°C
44 LGA
MAXM22511GLH+
-40°C to +105°C
44 LGA
MAXM22511GLH+T
-40°C to +105°C
44 LGA
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Chip Information
PROCESS: BiCMOS
www.maximintegrated.com
Maxim Integrated │ 22
MAXM22510/MAXM22511
2.5kVRMS Complete Isolated RS-485/RS-422
Module Transceiver + Power
Revision History
REVISION
NUMBER
REVISION
DATE
0
6/18
Initial release
7/18
Updated General Description, Benefits and Features, Package Thermal
1, 2, 4–6, 11–13, 15,
Characteristics, Electrical Characteristics table, Typical Operating Characteristics,
16, 17, 19
Pin Description, Function Tables, and Detailed Description
1
1.1
2
PAGES
CHANGED
DESCRIPTION
—
Corrected typos
6/19
1, 5–6, 16, 17
Updated the Safety Regulatory Approvals and Absolute Maximum Ratings
section; added the Safety Regulatory Approvals table; updated Note 10; removed
future product designation from MAXM22510GLH+ and MAXM22510GLH+T
1, 2, 7, 22
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.
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