Specifications

27PLCs: Featured Products
RS-485 Transceivers with Integrated
Termination Simplify Equipment Installation
MAX13450E/MAX13451E
RS-485 half-duplex and full-duplex networks operating at high data rates
must have their transmission lines terminated at both ends in order to
minimize reections from termination-impedance mismatch. To perform the
termination, typically discrete resistors are either put into the equipment
or added externally at the end-point devices on the line. Most commonly,
120 transmission lines are used in RS-485 applications. Recently, however,
100 lines have become preferred because they use Ethernet cables.
The new RS-485 transceivers like the MAX13450E/MAX13451E eliminate
the need for external termination resistors because they integrate pin-
selectable 100/120 resistors. The integrated logic-level translation
(V
L
pin) provides compatibility with mixed-voltage systems.
Benefits
• Flexible configurations interface to
many applications, reducing inventory
◦ Pin-selectable 100/120
termination resistors eliminate
external components
◦ Pin-selectable slew-rate limiting
improves EMI performance
◦ Integrated V
L
pin (down to 1.62V)
allows interfacing with mixed-
voltage systems
• Integrated protection is ideal for harsh
environments
◦ Fail-safe operation
◦ High ±30kV HBM ESD protection
◦ Fault output indicates short circuits
• Works over extreme temperatures
with safety shutdown
◦ -40°C to +125°C automotive
temperature grade
◦ Thermal shutdown at +150°C
D
LOGIC-LEVEL
TRANSLATION
LOGIC
SRL
INV
DI
FAULT
DE
TERM
B
A
RE
RO
TERM100
GND
V
L
V
CC
D
LOGIC-LEVEL
TRANSLATION
SRL
DI
DE
TERM
Z
Y
A
B
RE
RO
TERM100
GND
V
L
V
CC
MAX13450E
MAX13451E
RS-485 transceivers integrate all functions needed for robust industrial communications.