LTC2862/LTC2863/
LTC2864/LTC2865
±60V Fault Protected 3V to 5.5V
RS485/RS422 Transceivers
FEATURES
n
n
n
n
n
n
n
n
n
n
n
n
n
DESCRIPTION
The LTC
®
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.
Protected from Overvoltage Line Faults to ±60V
3V to 5.5V Supply Voltage
20Mbps or Low EMI 250kbps Data Rate
±15kV ESD Interface Pins, ±8kV All Other Pins
Extended Common Mode Range: ±25V
Guaranteed Failsafe Receiver Operation
High Input Impedance Supports 256 Nodes
1.65V to 5.5V Logic Supply Pin (V
L
) for Flexible
Digital Interface (LTC2865)
H-Grade Option Available (–40°C to 125°C)
Fully Balanced Differential Receiver Thresholds for
Low Duty Cycle Distortion
Current Limited Drivers and Thermal Shutdown
Pin Compatible with LT1785 and LT1791
Available in DFN and Leaded Packages
APPLICATIONS
n
n
n
n
n
n
PRODUCT SELECTION GUIDE
PART
NUMBER
LTC2862-1
LTC2862-2
LTC2863-1
LTC2863-2
LTC2864-1
LTC2864-2
LTC2865
DUPLEX
HALF
HALF
FULL
FULL
FULL
FULL
FULL
ENABLES
YES
YES
NO
NO
YES
YES
YES
MAX DATA
RATE (bps)
20M
250k
20M
250k
20M
250k
20M/250k
V
L
PIN
NO
NO
NO
NO
NO
NO
YES
Supervisory Control and Data Acquisition (SCADA)
Industrial Control and Instrumentation Networks
Automotive and Transportation Electronics
Building Automation, Security Systems and HVAC
Medical Equipment
Lighting and Sound System Control
L,
LT, LTC, LTM, Linear Technology the Linear logo and μModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
RS485 Link With Large Ground Loop Voltage
LTC2862
VCC1
RO1
RE1
DE1
DI1
D
R
R
t
R
t
D
VCC2
R
RO2
RE2
DE2
DI2
LTC2862
LTC2865 Receiving 10Mbps ±200mV Differential
Signal with 1MHz ±25V Common Mode Sweep
A,B
A,B
50V/DIV
A-B
A-B
0.5V/DIV
GND1
V GROUND LOOP
≤25V
2862345 TA01a
RO
5V/DIV
RO
GND2
100ns/DIV
2862345 TA01b
2862345f
1
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
