LTC2873H Ver la hoja de datos (PDF) - Analog Devices
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LTC2873H Datasheet PDF : 32 Pages
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LTC2873
Single-Bus RS485/RS232
Multiprotocol Transceiver with
Switchable Termination
FEATURES
DESCRIPTION
nn One RS485 or One RS232 Transceiver
nn 3V to 5.5V Supply Voltage
nn Up to 20Mbps RS485
nn Slew-Controlled RS232 Operation:
nn Selectable 1Mbps or 250kbps
nn Automatic Selection of Integrated RS485 (120Ω)
and RS232 (5kΩ) Termination Resistors
nn High ESD: ±26kV HBM
nn Logic Loopback Mode
nn 1.7V to 5.5V Logic Interface
nn Supports Up to 256 RS485 Nodes
nn RS485 Receiver Failsafe Eliminates UART Lockup
nn H-Grade Available (–40°C to 125°C)
nn Available in 24-Pin 4mm × 5mm QFN Package
APPLICATIONS
nn Software Selectable RS232/RS485/RS422 Interface
nn Industrial Sensors and Actuators
nn Alarm Systems
nn Traffic Control and Monitoring
nn Highway Signs and Jumbo Displays
The LTC®2873 is a robust pin-configurable multiprotocol
transceiver that supports RS232, RS485, and RS422
protocols while operating on a single 3V to 5.5V supply.
The LTC2873 can be configured as a half-duplex RS485
transceiver or as an RS232 transceiver using the same
two bus pins.
A pin-controlled integrated termination resistor allows for
easy interface reconfiguration, eliminating external resis-
tors and control relays. Loopback mode steers the driver
inputs to the receiver outputs for diagnostic self-test.
The RS485 receiver supports up to 256 nodes per bus,
and features full failsafe operation for floating, shorted or
terminated inputs.
An integrated DC/DC boost converter uses a tiny
2mm × 1.6mm inductor and one capacitor, eliminating
the need for multiple supplies when driving RS232 levels.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
1.7V TO VCC
1μF
VL
DATA IN
SHDN
DI
220nF
LTC2873 CAP
SW
RS485
10μH
3V TO 5.5V
2.2μF
VCC
A/DO
RS485 RS232
(485/232 (485/232
HIGH) LOW)
DATA OUT
485/232
D/R
(485)
RO
485/232
RE485
TE485
DE485/
F232
LB
GND
RS232
120Ω
5k
B/RI
VDD
1μF
VEE
1μF
2873 TA01
DI
485/232
5V/DIV
B/RI
A/DO
3V/DIV
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For more information www.analog.com
RS485/RS232 Mode Switching
RS232
RS485
1µs/DIV
2873 TA01b
REV B
1
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