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LTC2870CFEPBF

Description
RS232/RS485 Multiprotocol Transceivers with Integrated Termination
File Size412KB,36 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC2870CFEPBF Overview

RS232/RS485 Multiprotocol Transceivers with Integrated Termination

FEATURES
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LTC2870/LTC2871
RS232/RS485 Multiprotocol
Transceivers with
Integrated Termination
DESCRIPTION
The LTC
®
2870/LTC2871 are robust pin-configurable mul-
tiprotocol transceivers, supporting RS232, RS485, and
RS422 protocols, operating on a single 3V to 5.5V supply.
The LTC2870 can be configured as two RS232 single-ended
transceivers or one RS485 differential transceiver on shared
I/O lines. The LTC2871 offers independent control of two
RS232 transceivers and one RS485 transceiver, each on
dedicated I/O lines.
Pin-controlled integrated termination resistors allow
for easy interface reconfiguration, eliminating external
resistors and control relays. Half-duplex switches allow
four-wire and two-wire RS485 configurations. Loopback
mode steers the driver inputs to the receiver outputs for
diagnostic self-test.The RS485 receivers support up to
256 nodes per bus, and feature full failsafe operation for
floating, shorted or terminated inputs.
An integrated DC/DC boost converter uses a small induc-
tor and one capacitor, eliminating the need for multiple
supplies for driving RS232 levels.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
One RS485 and Two RS232 Transceivers
3V to 5.5V Supply Voltage
20Mbps RS485 and 500kbps RS232
Automatic Selection of Integrated RS485 (120Ω)
and RS232 (5kΩ)Termination Resistors
Half-/Full-Duplex RS485 Switching
High ESD: ±26kV (LTC2870), ±16kV (LTC2871)
Logic Loopback Mode
1.7V to 5.5V Logic Interface
Supports Up to 256 RS485 Nodes
RS485 Receiver Failsafe Eliminates UART Lockup
Available in 28-Pin 4mm
×
5mm QFN and
TSSOP (LTC2870), and 38-Pin 5mm
×
7mm QFN
and TSSOP (LTC2871)
APPLICATIONS
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Flexible RS232/RS485/RS422 Interface
Software Selectable Multiprotocol Interface Ports
Point-of-Sale Terminals
Cable Repeaters
Protocol Translators
TYPICAL APPLICATIONS
Protocol Switching with
Automatic Termination Selection
1.7V TO V
CC
V
L
RS232 RS485
485/232
DY
Y
Z
A
DZ
RA
A
B
RB
RO
120Ω
B
DIN1
ROUT1
DIN2
ROUT2
DOUT1
RIN1
DOUT2
RIN2
RS485
FULL HALF
DUPLEX
RO,
RB
A
B
H/F
LTC2870
3V TO 5.5V
V
CC
RS485
TERMINATION
OFF ON
120Ω
DI
Z
DI,
DY
Y
Z
Simultaneous Protocols and
RS485 Termination Switching
1.7V TO V
CC
V
L
TE485
Y
LTC2871
3V TO 5.5V
V
CC
RS485 Duplex Switching
1.7V TO V
CC
V
L
LTC2870,
LTC2871
3V TO 5.5V
V
CC
28701 TA01
28701f
1

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LTC2870CFEPBF LTC2870 LTC2870CUFDPBF LTC2870IFEPBF LTC2870IUFDPBF LTC2871CFEPBF LTC2871CUHFPBF LTC2871IFEPBF LTC2871IUHFPBF
Description RS232/RS485 Multiprotocol Transceivers with Integrated Termination RS232/RS485 Multiprotocol Transceivers with Integrated Termination RS232/RS485 Multiprotocol Transceivers with Integrated Termination RS232/RS485 Multiprotocol Transceivers with Integrated Termination RS232/RS485 Multiprotocol Transceivers with Integrated Termination RS232/RS485 Multiprotocol Transceivers with Integrated Termination RS232/RS485 Multiprotocol Transceivers with Integrated Termination RS232/RS485 Multiprotocol Transceivers with Integrated Termination RS232/RS485 Multiprotocol Transceivers with Integrated Termination
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