Datasheet

LTC2862/LTC2863/
LTC2864/LTC2865
1
2862345fc
For more information www.linear.com/LTC2862
Typical applicaTion
DescripTion
±60V Fault Protected 3V to 5.5V
RS485/RS422 Transceivers
RS485 Link With Large Ground Loop Voltage
FeaTures
applicaTions
n
Protected from Overvoltage Line Faults to ±60V
n
3V to 5.5V Supply Voltage
n
20Mbps or Low EMI 250kbps Data Rate
n
±15kV ESD Interface Pins, ±8kV All Other Pins
n
Extended Common Mode Range: ±25V
n
Guaranteed Failsafe Receiver Operation
n
High Input Impedance Supports 256 Nodes
n
1.65V to 5.5V Logic Supply Pin (V
L
) for Flexible
Digital Interface (LTC2865)
n
MP-Grade Option Available (–55°C to 125°C)
n
Fully Balanced Differential Receiver Thresholds for
Low Duty Cycle Distortion
n
Current Limited Drivers and Thermal Shutdown
n
Pin Compatible with LT1785 and LT1791
n
Available in DFN and Leaded Packages
n
Supervisory Control and Data Acquisition (SCADA)
n
Industrial Control and Instrumentation Networks
n
Automotive and Transportation Electronics
n
Building Automation, Security Systems and HVAC
n
Medical Equipment
n
Lighting and Sound System Control
LTC2865 Receiving 10Mbps ±200mV Differential
Signal with 1MHz ±25V Common Mode Sweep
PART
NUMBER
DUPLEX
ENABLES
MAX
DATA
RATE (bps)
V
L
PIN
LTC2862-1 HALF YES 20M NO
LTC2862-2 HALF YES 250k NO
LTC2863-1 FULL NO 20M NO
LTC2863-2 FULL NO 250k NO
LTC2864-1 FULL YES 20M NO
LTC2864-2 FULL YES 250k NO
LTC2865 FULL YES 20M/250k YES
The LT C
®
2862/LTC2863/LTC2864/LTC2865 are low power,
20Mbps or 250kbps RS485/RS422 transceivers operating
on 3V to 5.5V supplies that feature ±60V overvoltage fault
protection on the data transmission lines during all modes
of operation, including power-down. Low EMI slew rate
limited data transmission is available in a logic-selectable
250kbps mode in the LTC2865 and in 250kbps versions of
the LTC2862-LTC2864. Enhanced ESD protection allows
these parts to withstand ±15kV HBM on the transceiver
interface pins without latchup or damage.
Extended ±25V input common mode range and full fail
-
safe operation improve data communication reliability in
electrically
noisy environments and in the presence of
large ground loop voltages.
L, LT , LT C , LT M , Linear Technology the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
proDucT selecTion GuiDe
GND1
GND2
2862345 TA01a
R
t
R
t
RO1
RE1
DE1
DI1
VCC1
LTC2862 LTC2862
VCC2
RO2
RE2
DE2
DI2
D D
R R
V GROUND LOOP
≤25V PEAK
A,B
50V/DIV
A-B
0.5V/DIV
100ns/DIV
2862345 TA01b
RO
5V/DIV
RO
A,B
A-B

Summary of content (26 pages)