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MAX3535EEWIMAXIMN/a30avai+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 【15kV ESD Protection
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MXL1535EEWIMAXIMN/a45avai+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 【15kV ESD Protection


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MAX3535EEWI-MXL1535ECWI-MXL1535EEWI
+3V to +5V, 2500VRMS Isolated RS-485/RS-422 Transceivers with 【15kV ESD Protection
General Description
The MAX3535E/MXL1535E isolated RS-485/RS-422 full-
duplex transceivers provide 2500VRMSof galvanic isola-
tion between the RS-485/RS-422 side and the processor
or control logic side. These devices allow fast,
1000kbps communication across an isolation barrier
when the common-mode voltages (i.e., the ground
potentials) on either side of the barrier are subject to
large differences. Isolation is achieved through integrat-
ed high-voltage capacitors. The MAX3535E/MXL1535E
also feature a 420kHz transformer driver that allows
power transfer to the RS-485 side using an external
transformer.
The MAX3535E/MXL1535E include one differential driver,
one receiver, and internal circuitry to send the RS-485
signals and control signals across the isolation barrier
(including the isolation capacitors).The MAX3535E/
MXL1535E RS-485 receivers are 1/8 unit load, allowing
up to 256 devices on the same bus.
The MAX3535E/MXL1535E feature true fail-safe circuitry.
The driver outputs and the receiver inputs are protected
from ±15kV electrostatic discharge (ESD) on the inter-
face side, as specified in the Human Body Model (HBM).
The MAX3535E/MXL1535E feature driver slew-rate
select that minimizes electromagnetic interference (EMI)
and reduces reflections. The driver outputs are short-cir-
cuit and overvoltage protected. Other features are hot-
swap capability and isolation-barrier fault detection.
The MAX3535E operates with a single +3V to +5.5V
power supply. The improved secondary supply range of
the MAX3535E allows the use of step-down transformers
for +5V operation, resulting in considerable power sav-
ings. The MXL1535E operates with a single +4.5V to
+5.5V power supply. The MXL1535E is a function-/pin-
compatible improvement of the LTC1535. The
MAX3535E/MXL1535E are available over the commer-
cial 0°C to +70°C and extended -40°C to +85°C temper-
ature ranges.
Applications

Isolated RS-485 Systems
Systems with Large Common-Mode Voltages
Industrial-Control Local Area Networks
Telecommunications Systems
Features
2500VRMSRS-485 Bus Isolation Using On-Chip
High-Voltage Capacitors
1000kbps Full-Duplex RS-485/RS-422
Communication
+3V to +5.5V Power-Supply Voltage Range
(MAX3535E)
+4.5V to +5.5V Power-Supply Voltage Range
(MXL1535E)
1/8 Unit Receiver Load, Allowing 256 Devices on
Bus
±15kV ESD Protection Using HBMPin-Selectable Slew-Rate Limiting Controls EMIHot-Swap-Protected Driver-Enable InputUndervoltage LockoutIsolation-Barrier Fault DetectionShort-Circuit ProtectedThermal ShutdownOpen-Line and Shorted-Line Fail-Safe Receiver
Inputs
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection

19-3270; Rev 0; 4/04
Typical Application Circuitappears at end of data sheet.
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS TABLE (MAX3535E)

(VCC1= +3.0V to +5.5V, VCC2= +3.13V to +7.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC1= +3.3V,
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.
Logic Side—All Voltages Referenced to GND1.
VCC1.........................................................................-0.3V to +6V
RE, DE, DI.................................................................-0.3V to +6V
RO1, ST1, ST2..........................................-0.3V to (VCC1+ 0.3V)
Isolated Side—All Voltages Referenced to GND2.
VCC2.........................................................................-0.3V to +8V
SLO...........................................................-0.3V to (VCC2+ 0.3V)
A, B......................................................................................±14V
RO2.....................-0.3V to the lower of (VCC2+ 0.3V) and +3.4V
Y, Z............................................................................-8V to +13V
Digital Outputs Maximum Current
RO1, RO2.....................................................................±20mA
Y, Z Maximum Current.............................Short-Circuit Protected
ST1, ST2 Maximum Current............................................±300mA
Continuous Power Dissipation (TA= +70°C)
28-Pin Wide SO
(derate 9.5mW/°C above +70°C).................................750mW
Operating Temperature Range
MXL1535ECWI, MAX3535ECWI.........................0°C to +70°C
MXL1535EEWI, MAX3535EEWI.......................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
DC ELECTRICAL CHARACTERISTICS TABLE (MAX3535E) (continued)

(VCC1= +3.0V to +5.5V, VCC2= +3.13V to +7.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC1= +3.3V,
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
DC ELECTRICAL CHARACTERISTICS TABLE (MAX3535E) (continued)

(VCC1= +3.0V to +5.5V, VCC2= +3.13V to +7.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C,
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
SWITCHING ELECTRICAL CHARACTERISTICS (MAX3535E)

(VCC1= +3.0V to +5.5V, VCC2= +3.13V to +7.5V, RL= 27Ω, CL= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
ELECTRICAL CHARACTERISTICS (MXL1535E)

(VCC1= +4.5V to +5.5V, VCC2= +4.5V to +7.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC1= +5V,
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
ELECTRICAL CHARACTERISTICS (MXL1535E) (continued)

(VCC1= +4.5V to +5.5V, VCC2= +4.5V to +7.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC1= +5V,
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
ELECTRICAL CHARACTERISTICS (MXL1535E) (continued)

(VCC1= +4.5V to +5.5V, VCC2= +4.5V to +7.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC1= +5V,
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
SWITCHING ELECTRICAL CHARACTERISTICS (MXL1535E)

(VCC1= +4.5V to +5.5V, VCC2= +4.5V to +7.5V, RL= 27Ω, CL= 50pF, TA= -40°C to +85°C, unless otherwise noted. Typical values
Note 2:
60s test result is guaranteed by correlation from 1s result.
Note 3:
VISOis the voltage difference between GND1 and GND2.
Note 4:
The maximum data rate is specified using the maximum jitter value according to the formula: data rate = 1 / (4tJ). See the
Skew sectionfor more information.
Note 5:
Initial startup time is the time for communication to recover after a fault condition. Internal communication timeout fault time
is the time before a fault is indicated on RE,after internal communication has stopped.
Note 6:
Bd = 2 bits.
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
Typical Operating Characteristics

(VCC1= +5V, CL= 50pF (Figure1), unless otherwise noted.)
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
Typical Operating Characteristics (continued)

(VCC1= +5V, CL= 50pF (Figure1), unless otherwise noted.)
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
Typical Operating Characteristics (continued)

(VCC1= +5V, CL= 50pF (Figure1), unless otherwise noted.)
MAX3535E/MXL1535E
+3V to +5V, 2500VRMSIsolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
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