General Description
The MAX14853/MAX14855 isolated RS-485/
RS-422 transceivers provide 2750VRMS (60s) of galvanic
isolation between the cable-side (RS-485/RS-422 driver/
receiver-side) and the UART-side of the device. 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 (MAX14853) or 25Mbps
(MAX14855).
The MAX14853/MAX14855 include an integrated 450kHz
transformer driver for power transfer to the cable-side of
the transceiver using an external transformer. An integrated
LDO provides a simple and space-efficient architecture
for providing power to the cable-side of the IC.
The MAX14853/MAX14855 include one drive channel
and one receive channel. The receiver is ¼-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 MAX14853/MAX14855 are available in a wide body
16-pin SOIC package and operate over the -40°C to
+105°C temperature range.
Applications
●Industrial Automation Equipment
●Programmable Logic Controllers
●HVAC
●Power Meters
Safety Regulatory Approvals
●UL According to UL1577
●cUL According to CSA Bulletin 5A
Benets and Features
●Higher Integration Simplifies Designs
• Integrated LDO for Powering Cable Side
• Integrated Transformer Driver for Power Transfer to
Cable Side
●High-Performance Transceiver Enables Flexible
Designs
• Compliant with RS-485 EIA/TIA-485 Standard
• 500kbps (MAX14853)/25Mbps (MAX14855)
Maximum Data Rate
• Up to 128 Devices on the Bus
• Slew-Rate Limited Outputs (MAX14853)
• Integrated Receiver Deglitch Filter Increases Noise
Immunity (MAX14853)
●Integrated Protection Ensures for Robust
Communication
• ±35kV ESD (HBM) on Driver Outputs/Receiver
Inputs
• 2.75kVRMS Withstand Isolation Voltage for 60s (VISO)
• 630VPEAK Maximum Repetitive Peak Isolation
Voltage (VIORM)
• 445VRMS Maximum Working Isolation Voltage
(VIOWM)
• > 30 Years Lifetime at Rated Working Voltage
• Withstands ±10kV Surge per IEC 61000-4-5
• Thermal Shutdown
Ordering Information appears at end of data sheet.
19-7546; Rev 5; 10/17
Functional Diagram
LDO
XFMR
DRIVER
RS-485
TRANSCEIVER
V
DDA
RXD
RE
TXD
DE
A
B
V
DDB
V
LDO
TD2TD1
GNDA GNDB
MAX14853
MAX14855
Z
Y
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
EVALUATION KIT AVAILABLE
VDDA to GNDA .......................................................-0.3V to +6V
VDDB to GNDB .......................................................-0.3V to +6V
VLDO to GNDB .....................................................-0.3V to +16V
TD1, TD2 to GNDA ..............................................-0.3V to +12V
TXD, DE, RE to GNDA ...........................................-0.3V to +6V
RXD to GNDA......................................... -0.3V to (VDDA + 0.3V)
A, B, Y, Z to GNDB ...................................................-8V to +13V
TD1, TD2 Continuous Current .............................................1.4A
Short-Circuit Duration (RXD to GNDA, A, B, Y, Z,
VDDB to GNDB) ...................................................Continuous
Continuous Power Dissipation (TA = +70°C)
16-pin Wide SOIC
(derate 14.1mW/°C above +70°C) .........................1126.8mW
Operating Temperature Range ......................... -40°C to +105°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Junction-to-Ambient Thermal Resistance (θJA) ..............71°C/W Junction-to-Case Thermal Resistance (θJC) ...................23°C/W
(Note 1)
DC Electrical Characteristics
(VDDA - VGNDA = 3.0V to 5.5V, VDDB - VGNDB = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
VDDA - VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, and TA = +25°C.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER
Supply Voltage VDDA 3.0 5.5 V
VDDB 3.0 5.5
Supply Current
IDDA
VDDA = 5V, DE = high, RE = TXD =
low, RXD unconnected, no load,
TD1/TD2 unconnected
4.7 7.7
mA
IDDB
DE = high, RE = TXD = low, RXD
unconnected, no load, VDDB = 3.3V 7.4 12.5
Undervoltage Lockout
Threshold
VUVLOA
RE, RXD, DE, TXD 1.50 1.58 1.65
VTD1/TD2 driver 2.55 2.7 2.85
VUVLOB 2.55 2.7 2.85
Undervoltage Lockout
Threshold Hysteresis
VUVHYSTA
RE, RXD, DE, TXD 50
mVTD1/TD2 driver 200
VUVHYSTB 200
TRANSFORMER DRIVER
Output Resistance ROTD1/TD2 = low, IOUT = 300mA 0.6 1.5 Ω
TD1, TD2 Current Limit ILIM
4.5V ≤ VDDA ≤ 5.5V 540 785 1300 mA
3.0V ≤ VDDA ≤ 3.6V 485 730 1170
Switching Frequency fSW 350 450 550 kHz
Duty Cycle D 50 %
Crossover Dead Time tDEAD 50 ns
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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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.
Absolute Maximum Ratings
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
DC Electrical Characteristics (continued)
(VDDA - VGNDA = 3.0V to 5.5V, VDDB - VGNDB = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA
- VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, and TA = +25°C.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LDO
LDO Supply Voltage VLDO Relative to GNDB, LDO is on (Note 4) 3.18 14 V
LDO Supply Current ILDO DE = high, RE = TXD = low, no load,
VLDO = 5.5V 7.5 12.9 mA
LDO Output Voltage VDDB 3.0 3.3 3.6 V
LDO Current Limit 300 mA
Load Regulation VLDO = 3.3V, ILOAD = -20mA 0.19 1.7 mV/mA
Line Regulation VLDO = 3.3V, ILOAD = -20mA 0.12 1.8 mV/V
Dropout Voltage VLDO = 3.18V, IDDB = -120mA 100 180 mV
Load Capacitance Nominal value (Note 5) 1 10 µF
LOGIC INTERFACE (TXD, RXD, DE, RE)
Input High Voltage VIH RE, TXD, DE to GNDA 0.7 x
VDDA V
Input Low Voltage VIL RE, TXD, DE to GNDA 0.8 V
Input Hysteresis VHYS RE, TXD, DE to GNDA 220 mV
Input Capacitance CIN RE, TXD, DE, f = 1MHz 2 pF
Input Pullup Current IPU TXD -10 -4.5 -1.5 µA
Input Pulldown Current IPD DE, RE 1.5 4.5 10 µA
Output Voltage High VOH RXD to GNDA, IOUT = -4mA VDDA
-0.4 V
Output Voltage Low VOL RXD to GNDA, IOUT = 4mA 0.4 V
Short-Circuit Output Pullup
Current ISH_PU 0V ≤ VRXD ≤ VDDA, RE = low 6.4 42 mA
Short-Circuit Output Pulldown
Current ISH_PD 0V ≤ VRXD ≤ VDDA, RE = low 5.5 40 mA
Three-State Output Current IOZ 0V ≤ VRXD ≤ VDDA, RE = high -1 +1 µA
DRIVER
Differential Driver Output |VOD|
RL = 54Ω, TXD = high or low,
Figure 1a 1.5
V
RL = 100Ω, TXD = high or low,
Figure 1a 2.0
-7V ≤VCM ≤ +12V, Figure 1b 1.5 5
Change in Magnitude of Differ-
ential Driver Output Voltage ΔVOD RL = 100Ω or 54Ω, Figure 1a (Note 6) 0.2 V
Driver Common-Mode Output
Voltage VOC RL = 100Ω or 54Ω, Figure 1a (Note 6) VDDB/
23 V
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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DC Electrical Characteristics (continued)
(VDDA - VGNDA = 3.0V to 5.5V, VDDB - VGNDB = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA
- VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, and TA = +25°C.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Change in Magnitude of
Common-Mode Voltage ΔVOC RL = 100Ω or 54Ω, Figure 1a (Note 5) 0.2 V
Driver Short-Circuit Output
Current IOSD
GNDB ≤ VOUT ≤ +12V, output low
(Note 7) +30 +250
mA
-7V ≤ VOUT ≤ VDDB, output high
(Note 7) -250 -30
Single-Ended Driver Output
Voltage High VOH Y and Z outputs, IY, Z = -20mA 2.2 V
Single-Ended Driver Output
Voltage Low VOL Y and Z outputs, IY, Z = +20mA 0.8 V
Differential Driver Output
Capacitance COD DE = RE = high, f = 4MHz 12 pF
RECEIVER
Input Current (A and B) IA, IB
DE = GNDA,
VDDB = VGNDB
or 3.6V
VIN = +12V +250
µA
VIN = -7V -200
Receiver Differential Threshold
Voltage VTH -7V ≤ VCM ≤ +12V -200 -120 -10 mV
Receiver Input Hysteresis ΔVTH VCM = 0V 20 mV
Receiver Input Resistance RIN -7V ≤ VCM ≤ +12V, DE = low 48 kΩ
Differential Input Capacitance CA,B Measured between A and B,
DE = RE = GNDA at 2MHz 12 pF
PROTECTION
Thermal-Shutdown Threshold TSHDN Temperature rising +160 °C
Thermal-Shutdown Hysteresis THYST 15 °C
ESD Protection
(A, B, Y, Z Pins to GNDB)
Human Body Model ±35
kV
IEC 61000-4-2 Air-Gap Discharge to
GND ±18
IEC 61000-4-2- Contact Discharge to
GND ±8
ESD Protection
(A, B, Y, Z, GNDB Pins to
GNDA)
Human Body Model ±8 kV
ESD Protection (All Other Pins) Human Body Model ±4 kV
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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Switching Electrical Characteristics (MAX14853)
(VDDA - VGNDA = 3.0V to 5.5V, VDDB - VGNDB = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA
- VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, and TA = +25°C.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DYNAMIC
Common-Mode Transient
Immunity CMTI (Note 8) 35 kV/μs
Glitch Rejection TXD, DE, RXD 10 17 29 ns
DRIVER
Driver Propagation Delay 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 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
RECEIVER
Receiver Propagation Delay tRPLH, tRPHL CL = 15pF, Figure 6 and Figure 7
(Note 9) 240 ns
Receiver Output Skew tRSKEW CL = 15pF, Figure 6 and Figure 7
(Note 9) 34 ns
Maximum Data Rate DRMAX 500 kbps
Receiver Enable to Output
High tRZH RL = 1kΩ, CL = 15pF, S2 closed,
Figure 8 20 ns
Receiver Enable to Output Low tRZL RL = 1kΩ, CL = 15pF, S1 closed,
Figure 8 30 ns
Receiver Disable Time From
Low tRLZ RL = 1kΩ, CL = 15pF, S1 closed,
Figure 8 20 ns
Receiver Disable Time From
High tRHZ RL = 1kΩ, CL = 15pF, S2 closed,
Figure 8 20 ns
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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Note 2: All devices are 100% production tested at TA = +25°C. Specifications over temperature are guaranteed by design.
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: VLDO max indicates voltage capability of the circuit. Power dissipation requirements may limit VLDO max to a lower value.
Note 5: Not production tested. Guaranteed by design.
Note 6: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the TXD input changes state.
Note 7: The short-circuit output current applies to the peak current just prior to current limiting.
Note 8: 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.
Note 9: Capacitive load includes test probe and fixture capacitance.
Switching Electrical Characteristics (MAX14855)
(VDDA - VGNDA = 3.0V to 5.5V, VDDB - VGNDB = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDDA
- VGNDA = 3.3V, VDDB - VGNDB = 3.3V, VGNDA = VGNDB, and TA = +25°C.) (Note 5)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DYNAMIC
Common-Mode Transient
Immunity CMTI (Note 8) 35 kV/μs
Glitch Rejection TXD, DE, RXD 10 17 29 ns
DRIVER
Driver Propagation Delay 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 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
RECEIVER
Receiver Propagation Delay tRPLH, tRPHL CL = 15pF, Figure 6 and Figure 7
(Note 9) 65 ns
Receiver Output Skew tRSKEW CL = 15pF, Figure 6 and Figure 7
(Note 9) 7 ns
Maximum Data Rate DRMAX 25 Mbps
Receiver Enable to Output High tRZH RL = 1kΩ, CL = 15pF, S2 closed,
Figure 8 20 ns
Receiver Enable to Output Low tRZL RL = 1kΩ, CL = 15pF, S1 closed,
Figure 8 30 ns
Receiver Disable Time from Low tRLZ RL = 1kΩ, CL = 15pF, S1 closed,
Figure 8 20 ns
Receiver Disable Time from High tRHZ RL = 1kΩ, CL = 15pF, S2 closed,
Figure 8 20 ns
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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Insulation Characteristics
Safety Regulatory Approvals
PARAMETER SYMBOL CONDITIONS VALUE UNITS
Partial DischargeTest Voltage VPR
Method B1 = VIORM x 1.875 (t = 1s,
partial discharge < 5pC) 1182 VP
Maximum Repetitive Peak Isolation
Voltage VIORM (Note 10) 630 VP
Maximum Working Isolation Voltage VIOWM (Note 10) 445 VRMS
Maximum Transient Isolation Voltage VIOTM t = 1s 4600 VP
Maximum Withstand Isolation Voltage VISO t = 60s, f = 60Hz (Notes 10, 11) 2750 VRMS
Maximum Surge Isolation Voltage VIOSM Basic insulation 10 kV
Insulation Resistance RSTA = +150°C, VIO = 500V >109Ω
Barrier Capacitance Input-to-Output CIO f = 1MHz 2 pF
Minimum Creepage Distance CPG Wide SO 8 mm
Minimum Clearance Distance CLR Wide SO 8 mm
Internal Clearance Distance through insulation 0.015 mm
Comparative Tracking Resistance Index CTI Material Group II (IEC 60112) 575
Climatic Category 40/125/21
Pollution Degree (DIN VDE 0110, Table 1) 2
UL
The MAX14853/MAX14855 is certied under UL1577. For more details, see le E351759.
Rate up to 2750VRMS isolation voltage for basic insulation.
cUL
The MAX14853/MAX14855 is certied under UL1577. For more details, see File E351759. Rate up to 2750VRMS isolation voltage
for basic insulation.
Note 10: VIORM, VIOWM, and VISO are defined by the IEC 60747-5-5 standard.
Note 11: Product is qualified VISO for 60 seconds. 100% production tested at 120% of VISO for 1s.
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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Figure 1. Driver DC Test Load
R
L
2
R
L
2
V
OC
V
OD
Y
Z
(a)
375Ω
V
CM
Y
Z
(b)
375Ω
+
-
60Ω
V
OD
RLCL
VOD
TXD
GNDA
Y
Z
50% 50%
GNDA
TXD
Z
Y
20%
80%
20%
80%
0
VO
-VO
VDIFF
tDSKEW = |tDPLH - tDPHL|
VDIFF = VY - VZ
VDDA
tLH P 3ns, tHL P 3ns
1/2 VO
tDPLH
tLH tHL
tDPHL
VO
1/2 VO
Figure 2. Driver Timing Test Circuit
Figure 3. Driver Propagation Delays
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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Figure 4. Driver Enable and Disable Times (tDZH, tDHZ)
Figure 5. Driver Enable and Disable Times (tDZL, tDLZ)
GNDA
GNDB
250mV
50%
tDZH
tDHZ
DE
VDDA
VOH
50%
OUT
RL = 500I
50I
OUT
S1
Y
Z
D
TXD
GNDA OR VDDA
GNDA
GNDB
GENERATOR
DE
CL
50pF
RL = 500I
CL = 50pF
50I
GNDB
GNDA
OUT
GNDA
250mV
50%
tDZL
tDLZ
DE
S1
Y
Z
D
TXD
GNDA OR VDDA
VDDB
VDDA
50%
OUT
VDDB
VOL
GENERATOR
DE
Figure 6. Receiver Propagation Delay Test Circuit
VID
B
A
RECEIVER
OUTPUT
ATE R
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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Figure 7. Receiver Propagation Delays
A
B
VOH
VOL
RXD
tRPHL
tRSKEW = |tRPHL - tRPLH|
t = 1MHz, tLH P 3ns, tHL P 3ns
tRPLH
-1V
1V
2
VDDA
2
VDDA
Figure 8. Receiver Enable and Disable Times
GENERATOR 50I
RL
1kI
CL
15pF
R
-1.5V
+1.5V
RXD
S1 VDDA
GNDA
GNDB
GNDA
S2
S3
VID
RE
RE
RXD
RE
RXD
RE RE
RXD RXD
GNDA
tRHZ tRLZ
0.25V
0.25V
50% 50%
GNDA GNDA
2
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
VOH
GNDA
GNDA
VOH
VDDA
VDDA
VDDA
50%50%
VDDA
tRZL
VOL
GNDA
VDDA
VDDA
VDDA
VOL
tRZH
2
VDDA
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
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(VDDA – VGNDA = 3.3V, VDDB – VGNDB = 3.3V, VGNDA = VGNDB, and TA = +25°C, unless otherwise noted.)
0
100
200
300
400
500
600
700
800
900
1000
-45 -30 -15 015 30 45 60 75 90 105
PROPAGATION DELAY (ns)
TEMPERATURE (°C)
MAX14853 TRANSMITTER PROPAGATION
DELAY vs. TEMPERATURE
toc04
RL= 54Ω
CL= 50pF
tPDHL
tPDLH
0
1
2
3
4
5
6
7
8
-45 -30 -15 015 30 45 60 75 90 105
IDDA (mA)
TEMPERATURE (°C)
V
DDA
SUPPLY CURRENT
vs. TEMPERATURE
toc01
NO LOAD
NO SWITCHING
TD1/TD2 UNCONNECTED
TXD
2V/div
0V
Y
1V/div
Z
1V/div
toc07
100ns/div
VOUTN
VINSIDE
VBACKUP
RL= 54Ω
CL= 50pF
0
2
4
6
8
10
12
14
-45 -30 -15 015 30 45 60 75 90 105
IDDB (mA)
TEMPERATURE (°C)
V
DDB
SUPPLY CURRENT
vs. TEMPERATURE
toc02
NO LOAD
NO SWITCHING
MAX14853 RECEIVER
PROPAGATION DELAY
RXD
2V/div
0V
B
1V/div
A
1V/div
toc08
100ns/div
CL= 15pF
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
-45 -30 -15 0 15 30 45 60 75 90 105
VOD (V)
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
toc03
NO LOAD
120Ω LOAD
54Ω LOAD
0
5
10
15
20
25
30
35
40
45
50
55
60
65
-45 -30 -15 015 30 45 60 75 90 105
PROPAGATION DELAY (ns)
TEMPERATURE (°C)
MAX14855 TRANSMITTER PROPAGATION
DELAY vs. TEMPERATURE
toc09
RL= 54Ω
CL= 50pF
tPDHL
tPDLH
0
20
40
60
80
100
120
140
160
180
200
220
240
-45 -30 -15 015 30 45 60 75 90 105
PROPAGATION DELAY (ns)
TEMPERATURE (°C)
MAX14853 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
toc05
tRPHL
tRPLH
CL= 15pF
0
100
200
300
400
500
600
700
800
900
1000
-45 -30 -15 015 30 45 60 75 90 105
ENABLE/DISABLE DELAY (ns)
TEMPERATURE (°C)
MAX14853 DRIVER ENABLE/DISABLE
DELAY vs. TEMPERATURE
toc06
tDZH
tDZL
tDHZ
tDLZ
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MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
Typical Operating Characteristics
(VDDA – VGNDA = 3.3V, VDDB – VGNDB = 3.3V, VGNDA = VGNDB, and TA = +25°C, unless otherwise noted.)
TXD
2V/div
0V
Y
1V/div
Z
1V/div
toc12
10ns/div
VOUTN
VINSIDE
VBACKUP
RL= 54Ω
CL= 50pF
0
5
10
15
20
25
30
35
40
45
50
55
60
65
-45 -30 -15 015 30 45 60 75 90 105
PROPAGATION DELAY (ns)
TEMPERATURE (°C)
MAX14855 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
toc10
tRPHL
tRPLH
CL= 15pF
0
2
4
6
8
10
12
14
16
18
20
-45 -30 -15 015 30 45 60 75 90 105
ENABLE/DISABLE DELAY (ns)
TEMPERATURE (°C)
RECEIVER ENABLE/DISABLE
DELAY vs. TEMPERATURE
toc14
tRZH
tRZL
tRHZ
tRLZ
0
10
20
30
40
50
60
70
80
-45 -30 -15 015 30 45 60 75 90 105
ENABLE/DISABLE DELAY (ns)
TEMPERATURE (°C)
MAX14855 DRIVER ENABLE/DISABLE
DELAY vs. TEMPERATURE
toc11
tDZH
tDZL
tDHZ
tDLZ
0
1
2
3
4
5
6
7
8
0.01 0.1 110 100
IDDA (mA)
DATA RATE (Mbps)
V
DDA
SUPPLY CURRENT
vs . DATA RAT E
toc15
54ΩLOAD
120ΩLOAD
MAX14855 RECEIVER
PROPAGATION DELAY
A
1V/div
B
1V/div
RXD
2V/div
toc13
10ns/div
VOUTN
VINSIDE
VBACKUP
0V
CL= 15pF
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MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
Typical Operating Characteristics (continued)
(VDDA – VGNDA = 3.3V, VDDB – VGNDB = 3.3V, VGNDA = VGNDB, and TA = +25°C, unless otherwise noted.)
TRANSFORMER DRIVER
TD1 & TD2
2V/div
0V
toc19
400ns/div
VOUTN
VINSIDE
VBACKUP
100mA LOAD ON VDDB
300
350
400
450
500
550
600
-45 -30 -15 015 30 45 60 75 90 105
SWITCHING FREQUENCY (kHz)
TEMPERATURE (°C)
TRANSFORMER DRIVER SWITCHING
FREQUENCY vs. TEMPERATURE
toc17
0
10
20
30
40
50
60
70
0.01 0.1 1 10 100
IDDB(mA)
DATA RATE (Mbps)
V
DDB
SUPPLY
CURRENT vs. DATA RATE
toc16
NO LOAD
120Ω LOAD
54Ω LOAD
0
50
100
150
200
250
300
350
400
0100 200 300 400 500 600 700
TD1/TD2 DRIVER VOLTAGE (mV)
DRIVER CURRENT (mA)
TD1/TD2 VOLTAGE
vs. DRIVE CURRENT
toc18
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MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
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Protection and Integrated Transformer Driver
Typical Operating Characteristics (continued)
PIN NAME REFERENCE FUNCTION
1 TD1 GNDA Transformer Driver Output 1
2 TD2 GNDA Transformer Driver Output 2
3 GNDA — UART/Logic-Side Ground. GNDA is the ground reference for digital signals and the
transformer driver.
4 VDDA GNDA UART/Logic-Side Power Input. Bypass VDDA to GNDA with both 0.1μF and 1µF capacitors
as close as possible to the device.
5 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.
6RE 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 pull-
down to GNDA.
SOIC
TOP VIEW
A
BVDDA
1
2
16
15
VDDB
GNDBTD2
GNDA
TD1
3
4
14
13
Y
VLDO
DE
512 ZRXD
RE 6
7
11
10
GNDBTXD 8 9
MAX14853
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Pin Conguration
Pin Description
PIN NAME REFERENCE FUNCTION
7 DE GNDA
Driver Output Enable. Drive DE high to enable bus driver outputs Y and Z. Drive DE low or
connect to GNDA to disable Y and Z. Y and Z are high impedance when DE is low. DE has
an internal 4.5µA pulldown to GNDA.
8 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 pullup to VDDA.
9, 15 GNDB — Cable-Side Ground. GNDB is the ground reference for the internal LDO and the RS-485/
RS-422 bus signals.
10 VLDO GNDB
LDO Power Input. Connect a minimum voltage of 3.18V to VLDO to power the cable-side
of the transceiver. Bypass VLDO to GNDB with both 0.1μF and 1µF capacitors as close as
possible to the device. To disable the internal LDO, leave VLDO unconnected or connect to
GNDB.
11 YGNDB Noninverting Driver Output
12 Z GNDB Inverting Driver Output
13 B GNDB Inverting Receiver Input
14 A GNDB Noninverting Receiver Input
16 VDDB GNDB
Cable-Side Power Input/Isolated LDO Power Output. Bypass VDDB to GNDB with both
0.1μF and 1μF capacitors as close as possible to the device. VDDB is the output of the
internal LDO when power is applied to VLDO. When the internal LDO is not used (VLDO is
unconnected or connected to GNDB), VDDB is the positive supply input for the cable-side
of the IC.
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Pin Description (continued)
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.
Note: Drive RE high to disable the receiver output. Drive RE low to enable to receiver output. RE has an internal pulldown to GNDA.
X = Don’t care.
Function Tables
TRANSMITTING
INPUTS OUTPUTS
VDDA VDDB DE TXD Y Z
≥ VUVLOA ≥ VUVLOB 1 1 1 0
≥ VUVLOA ≥ VUVLOB 1 0 0 1
≥ VUVLOA ≥ VUVLOB 0 X High-Z High-Z
< VUVLOA ≥ VUVLOB X X High-Z High-Z
≥ VUVLOA < VUVLOB X X High-Z High-Z
< VUVLOA < VUVLOB X X High-Z High-Z
RECEIVING
INPUTS OUTPUTS
VDDA VDDB RE (VA - VB) RXD
≥ VUVLOA ≥ VUVLOB 0 > -10mV 1
≥ VUVLOA ≥ VUVLOB 0 < -200mV 0
≥ VUVLOA ≥ VUVLOB 0 Open/Short 1
≥ VUVLOA ≥ VUVLOB 1 X High-Z
< VUVLOA ≥ VUVLOB X X High-Z
≥ VUVLOA < VUVLOB 0 X 1
< VUVLOA < VUVLOB X X High-Z
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Detailed Description
The MAX14853/MAX14855 isolated RS-485/RS-422
transceivers provide 2750VRMS (60s) of galvanic isolation
between the RS-485/RS-422 cable-side of the transceiver
and the UART-side. These devices allow up to 500kbps
(MAX14853) or 25Mbps (MAX14855) communication
across an isolation barrier when a large potential exists
between grounds on each side of the barrier.
Isolation
Both data and power can be transmitted across the isolation
barrier. Data isolation is achieved using integrated capacitive
isolation that allows data transmission between the UART-
side and the cable-side of the transceiver.
To achieve power isolation, the MAX14853/MAX14855
feature an integrated transformer driver to drive an external
center-tapped transformer, allowing the transfer of operating
power from the UART-side across the isolation barrier to
the cable-side. Connect the primary side of the external
transformer to the MAX14853/MAX14855’s transformer
driver outputs (TD1 and TD2).
The MAX14853 features a slew-rate limited driver that
minimizes EMI and reduces reflections caused by improperly
terminated cables, allowing error-free data transmission at
data rates up to 500kbps. The MAX14853 also includes an
added deglitch filter on the receiver signal path for enhanced
noise immunity when differential signals have very slow rise
and fall times.
Integrated LDO
The MAX14853/MAX14855 include an internal low-dropout
regulator with a set 3.3V (typ) output that is used to power
the cable-side of the IC. The output of the LDO is VDDB.
The LDO has a 300mA (typ) current limit. If the LDO is
unused, connect VLDO to GNDB and apply +3.3V directly
to VDDB.
True Fail-Safe
The MAX14853/MAX14855 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 logic high. In the case of a terminated bus with all
transmitters disabled, the receiver’s differential input voltage
is pulled to zero by the termination resistors. Due to the
receiver thresholds of the MAX14853/MAX14855, this
results in a logic-high at RXD.
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by 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 thermal-shut-
down circuit, forces the driver outputs into a high-imped-
ance state if the die temperature exceeds +160°C (typ).
Thermal Shutdown
The MAX14853/MAX14855 are protected from overtem-
perature damage by integrated thermal-shutdown circuitry.
When the junction temperature (TJ) exceeds +160°C (typ),
the driver outputs go high impedance. The device resumes
normal operation when TJ falls below +145°C (typ).
Transformer Driver
Overcurrent Limiting
The MAX14853/MAX14855 feature overcurrent limiting
to protect the integrated transformer driver from excessive
currents when charging large capacitive loads or
driving into short-circuits. Current limiting is achieved in
two stages: internal circuitry monitors the output current
and detects when the peak current rises above 1.2A.
When the 1.2A threshold is exceeded, internal circuitry
reduces the output current to the 730mA current-limit.
The MAX14853/MAX14855 monitor the driver current on
a cycle-by-cycle basis and limit the current until the short
is removed.
The transformer driver on the MAX14853/MAX14855 can
dissipate large amounts of power during overcurrent limiting,
causing the IC to enter thermal shutdown.
Transformer Selection
The integrated push-pull transformer driver allows the
transmission of operating power from the logic side, across
the isolation barrier, to the isolated field side of the device.
The 450kHz transformer driver operates with center-tapped
primary and secondary transformers. Select a transformer
with an ET product greater than or equal to the ET of the
driver to ensure that the transformer does not enter satura-
tion. E is the voltage applied to the transformer and T is the
maximum time it is applied during any one cycle. Calculate
the minimum ET product for the transformer primary as:
ET = VMAX/(2 x fMIN)
Where VMAX is the worst-case maximum supply voltage
on VDDA and fMIN is the minimum frequency at that supply
voltage. For example, using 5.5V and 350kHz, the
required minimum ET product is 7.9Vµs.
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Applications Information
128 Transceivers on the Bus
The standard RS-485 receiver input impedance is one unit
load, and a standard driver can drive up to 32 unit loads.
The MAX14853/MAX14855 transceivers have a ¼-unit
load receiver, allowing up to 128 transceivers connected
in parallel on one communication line. Connect any combi-
nation of these devices, and/or other RS-485 devices, for
a maximum of 32 unit loads to the line.
Typical Application
The MAX14853/MAX14855 full-duplex transceivers are
designed for bidirectional data communications on multi-
point bus transmission lines. Figure 9 and Figure 10 show
typical network applications circuits. To minimize reflections,
the bus should be terminated at the receiver input 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 defeats the
isolation.
Ensure that the decoupling capacitors between VDDA and
GNDA and between VLDO, VDDB, and GNDB are located
as close as possible to the IC to minimize inductance.
Route important signal lines close to the ground plane to min-
imize possible external influences. On the cable-side of the
MAX14853/MAX14855, it is good practice to have the bus
connectors and termination resistor as close as possible
to the A and B 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 MAX14853/MAX14855 have extra
protection against static electricity. The ESD structures
withstand high ESD in normal operation and when pow-
ered down. After an ESD event, the devices keep working
without latch-up or damage.
Bypass VDDA to GNDA and bypass VDDB and VLDO
to GNDB with both 0.1μF and 1μF capacitors to ensure
maximum ESD protection.
ESD protection can be tested in various ways. The
transmitter outputs and receiver inputs of the MAX14853/
MAX14855 are characterized for protection to the cable-
side ground (GNDB) to the following limits:
●±35kV HBM
● ±18kV using the Air-Gap Discharge method specied
in IEC 61000-4-2
● ±8kV using the Contact Discharge method specied
in the IEC 61000-4-2
The transmitter outputs and receiver inputs also include
extended ESD protection with reference to the UART-side
ground (GNDA) to the following limits:
●±8kV HBM
Table 1. Recommended Transformers
MANUFACTURER
PART NUMBER APPLICATION CONFIGURATION ISOLATION
(VRMS)
DIMENSIONS
(L x W x H) (mm)
HALO TGMS-1450V6LF 5V to 3.3V 1CT: 1CT 2750 9.45 x 10.87 x 10.03
HALO TGMS-1455V6LF 3.3V to 3.3V 1CT: 1.5CT 2750 9.45 x 10.87 x 10.03
WURTH 750315225 5V to 3.3V 1CT: 1.1CT 2750 6.73 x 7.14 x 4.19
WURTH 750315226 5V to 3.3V 1CT: 1.3CT 2750 6.73 x 7.14 x 4.19
WURTH 750315227 3.3V to 3.3V 1CT: 1.7CT 2750 6.73 x 7.14 x 4.19
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
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Figure 9. Typical Isolated Full-Duplex RS-485/RS-422 Application
RXD
RE
TXD
DE
RS-485 TRANSCEIVER
Y
Z
RXD
RE
TXD
DE
RS-485TRANSCEIVER
A
B
RXDRETXDDE
RS-485 TRANSCEIVERRS-485 TRANSCEIVER
AB
RXDRETXDDE
AB
120Ω
INTEGR
ATED
ISOLATION BARRIER
MAX14853
MAX14855
Master Slave
SlaveSlave
Figure 10. Typical Isolated RS-485/RS-422 Application with Integrated Transformer Driver
1µF
RXD
RE
TXD
DE
RS-485 TRANSCEIVER
A
B
MAX14853
MAX14855
V
DDA
V
LDO
V
DDB
TD1TD2
V
DDA
1
1
22
2
2
1µF
10µF
10µF
1µF
RXD
RE
TXD
DE
RS-485TRANSCEIVER
Y
Z
MAX14853
MAX14855
V
DDA
V
LDO
V
DDB
TD1TD2
V
DDA
3
3
3
4
4
4
1µF
10µF
10µF
1
3
2
1µF
3
1µF
1
2
0.1µF
3
0.1µF
4
0.1µF
2
0.1µF
3
0.1µF
Y
Z
A
B
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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 and Figure 12
shows the current waveform it generates when dis-
charged in a low-impedance state. This model consists of
a 100pF capacitor charged to the ESD voltage of interest,
which is then discharged in to 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 MAX14853/
MAX14855 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.
Figure 11. Human Body ESD Test Model Figure 12. Human Body Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC
1MΩ
RD
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
IP 100%
90%
36.8%
tRL TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPS
Figure 13. IEC 61000-4-2 ESD Test Model Figure 14. IEC 61000-4-2 ESD Generator Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC
50MΩ TO 100MΩ
RD
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
tr = 0.7ns TO 1ns 30ns
60ns
t
100%
90%
10%
IPEAK
I
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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 SOIC W16M+10 21-0042 90-0107
Ordering Information
PART DATA RATE (MAX) DRIVER SLEW RATE
LIMITED
RECEIVER
DEGLITCHING TEMP RANGE PIN-PACKAGE
MAX14853GWE+ 500kbps YES YES -40°C to +105°C 16 SOIC (W)
MAX14853GWE+T 500kbps YES YES -40°C to +105°C 16 SOIC (W)
MAX14855GWE+ 25Mbps NO NO -40°C to +105°C 16 SOIC (W)
MAX14855GWE+T 25Mbps NO NO -40°C to +105°C 16 SOIC (W)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and Reel
LDO
XFMR
DRIVER
RS-485
TRANSCEIVER
VDDA
RXD
TXD
DE
A
B
VDDB
VLDO
TD2TD1
GNDA GNDB
MAX14853
MAX14855
RE
ISOLATION BARRIER
µC
VDDA
Z
Y
Typical Application Circuit
MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
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Chip Information
PROCESS: BiCMOS
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 3/15 Initial release —
1 4/15 Updated Electrical Characteristics notes, Typical Operating Characteristics graph,
and Driver Output Protection section 6, 13, 17
2 10/15 Updated Benets and Feature and Isolation sections and added Recommended
Transformers table 1, 17, 18, 22
3 1/16 Corrected typos, updated Figures 1–4, and Figure 6 1, 8, 9, 16, 17, 19, 22
4 1/17 Updated pending safety approvals 1, 7
5 10/17 Corrected RXD voltage for RXD in Absolute Maxim Ratings and updated Table 1 2,18
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 specications 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.
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MAX14853/MAX14855 2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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.
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