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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX14853 Datasheet

Full-Duplex Transceivers

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EVALUATION KIT AVAILABLE
MAX14853/MAX14855
2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
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
Benefits 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
Functional Diagram
VDDA
TD1 TD2
VLDO
XFMR
DRIVER
LDO
MAX14853
MAX14855
RE
RXD
TXD
DE
VDDB
A
B
Z
Y
Ordering Information appears at end of data sheet.
GNDA
GNDB
19-7546; Rev 5; 10/17


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX14853 Datasheet

Full-Duplex Transceivers

No Preview Available !

MAX14853/MAX14855
2.75kVRMS Isolated 500kbps/25Mbps Full-Duplex
RS-485/RS-422 Transceivers with ±35kV ESD
Protection and Integrated Transformer Driver
Absolute Maximum Ratings
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
Continuous Power Dissipation (TA = +70°C)
16-pin Wide SOIC
(derate 14.1mW/°C above +70°C).......................... 1126.8mW
TXD, DE, RE to GNDA ............................................-0.3V to +6V
Operating Temperature Range.......................... -40°C to +105°C
RXD to GNDA......................................... -0.3V to (VDDA + 0.3V)
A, B, Y, Z to GNDB....................................................-8V to +13V
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
TD1, TD2 Continuous Current..............................................1.4A
Lead Temperature (soldering, 10s).................................. +300°C
Short-Circuit Duration (RXD to GNDA, A, B, Y, Z,
Soldering Temperature (reflow)........................................ +260°C
VDDB to GNDB)....................................................Continuous
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)
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 = 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
POWER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage
Supply Current
VDDA
3.0 5.5
VDDB
3.0 5.5
IDDA
VDDA = 5V, DE = high, RE = TXD =
low, RXD unconnected, no load,
TD1/TD2 unconnected
4.7 7.7
IDDB
DE = high, RE = TXD = low, RXD
unconnected, no load, VDDB = 3.3V
7.4 12.5
V
mA
Undervoltage Lockout
Threshold
Undervoltage Lockout
Threshold Hysteresis
TRANSFORMER DRIVER
VUVLOA
VUVLOB
VUVHYSTA
VUVHYSTB
RE, RXD, DE, TXD
TD1/TD2 driver
RE, RXD, DE, TXD
TD1/TD2 driver
1.50
2.55
2.55
1.58
2.7
2.7
50
200
200
1.65
2.85
2.85
V
mV
Output Resistance
RO TD1/TD2 = low, IOUT = 300mA
0.6 1.5
Ω
TD1, TD2 Current Limit
Switching Frequency
Duty Cycle
ILIM
4.5V ≤ VDDA ≤ 5.5V
3.0V ≤ VDDA ≤ 3.6V
fSW
D
540 785 1300
485 730 1170
350 450 550
50
mA
kHz
%
Crossover Dead Time
tDEAD
50 ns
www.maximintegrated.com
Maxim Integrated 2


Part Number MAX14853
Description Full-Duplex Transceivers
Maker Maxim Integrated
PDF Download

MAX14853 Datasheet PDF






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