MAX3535E Maxim, MAX3535E Datasheet

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MAX3535E

Manufacturer Part Number
MAX3535E
Description
+3V to +5V / 2500VRMS Isolated RS-485/RS-422 Transceivers with 15kV ESD Protection
Manufacturer
Maxim
Datasheet

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The MAX3535E/MXL1535E isolated RS-485/RS-422 full-
duplex transceivers provide 2500V
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.
19-3270; Rev 0; 4/04
Typical Application Circuit appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+3V to +5V, 2500V
Isolated RS-485 Systems
Systems with Large Common-Mode Voltages
Industrial-Control Local Area Networks
Telecommunications Systems
________________________________________________________________ Maxim Integrated Products
Transceivers with ±15kV ESD Protection
General Description
RMS
Applications
of galvanic isola-
RMS
Isolated RS-485/RS-422
♦ 2500V
♦ 1000kbps Full-Duplex RS-485/RS-422
♦ +3V to +5.5V Power-Supply Voltage Range
♦ +4.5V to +5.5V Power-Supply Voltage Range
♦ 1/8 Unit Receiver Load, Allowing 256 Devices on
♦ ±15kV ESD Protection Using HBM
♦ Pin-Selectable Slew-Rate Limiting Controls EMI
♦ Hot-Swap-Protected Driver-Enable Input
♦ Undervoltage Lockout
♦ Isolation-Barrier Fault Detection
♦ Short-Circuit Protected
♦ Thermal Shutdown
♦ Open-Line and Shorted-Line Fail-Safe Receiver
MAX3535ECWI
MAX3535EEWI
MXL1535ECWI
MXL1535EEWI
High-Voltage Capacitors
Communication
(MAX3535E)
(MXL1535E)
Bus
Inputs
TOP VIEW
PART
RMS
RS-485 Bus Isolation Using On-Chip
PINS 5–10 and 19–24 ARE REMOVED FROM THE PACKAGE
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
0°C to +70°C
0°C to +70°C
GND1
GND2
V
V
CC1
ST1
ST2
CC2
Y
Z
11
12
13
14
Ordering Information
1
2
3
4
WIDE SO
MAX3535E
MXL1535E
Pin Configuration
28 Wi d e S O
28 Wi d e S O
28 Wi d e S O
28 Wi d e S O
PACKAGE
PIN-
28
27
26
25
18
17
16
15
RO1
RE
DE
DI
SLO
RO2
A
B
Features
+ 3.0 to + 5.5
+ 3.0 to + 5.5
+ 4.5 to + 5.5
+ 4.5 to + 5.5
POWER-
SUPPLY
RANGE
(V)
1

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