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LTC2870HUFD#TRPBF

Description
IC TXRX RS422/485 20MBPS 28QFN
Categorysemiconductor    Analog mixed-signal IC   
File Size1MB,42 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
Download Datasheet Parametric View All

LTC2870HUFD#TRPBF Overview

IC TXRX RS422/485 20MBPS 28QFN

LTC2870HUFD#TRPBF Parametric

Parameter NameAttribute value
typetransceiver
protocolRS232,RS485
Number of drivers/receivers1/1
duplexComplete
receiver lag130mV
data rate20Mbps
Voltage - Power3 V ~ 5.5 V
Operating temperature-40°C ~ 125°C
Installation typesurface mount
Package/casing28-WFQFN Exposed Pad
Supplier device packaging28-QFN(4x5)
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 con-
trol 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 tiny
2mm × 1.6mm inductor 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 Analog
Devices, Inc. All other trademarks are the property of their respective owners.
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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
H-Grade Available for the LTC2870 (–40°C to 125°C)
Available in 28-Pin 4mm
×
5mm QFN and
TSSOP (LTC2870), and 38-Pin 5mm
×
7mm QFN
and TSSOP (LTC2871)
applicaTions
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Software Selectable RS232/RS485/RS422 Interface
Point-of-Sale Terminals
Cable Repeaters
Protocol Translators
Typical applicaTions
Protocol Switching with
Automatic Termination Selection
1.7V TO V
CC
0.1µF
220nF
3V TO 5.5V
10µH
2.2µF
0.1µF
Simultaneous Protocols and
RS485 Termination Switching
1.7V TO V
CC
220nF
3V TO 5.5V
10µH
2.2µF
0.1µF
RS485 Duplex Switching
1.7V TO V
CC
220nF
3V TO 5.5V
10µH
2.2µF
V
L
485/232
DY
CAP
SW
V
CC
V
L
TE485
CAP SW
LTC2871
V
CC
V
L
CAP SW
LTC2870,
LTC2871
V
CC
LTC2870
RS232 RS485
RS485
TERMINATION
OFF ON
Y
Z
Y
120
DI
Z
A
RO
120
B
RS485
FULL HALF
DUPLEX
RO,
RA
H/F
A
B
DI,
DY
Y
Z
DZ
RA
A
B
RB
V
DD
1µF
GND
V
EE
1µF
1µF
DIN1
ROUT1
DIN2
ROUT2
V
DD
GND
DOUT1
RIN1
DOUT2
RIN2
V
EE
1µF
V
DD
1µF
GND
V
EE
1µF
28701 TA01
28701fb
For more information
www.linear.com/LTC2870
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