LTC2862_15 Datasheet, PDF (1/26 Pages) Linear Technology – 60V Fault Protected 3V to 5.5V RS485/RS422 Transceivers

LTC2862/LTC2863/
LTC2864/LTC2865
±60V Fault Protected 3V to 5.5V
RS485/RS422 Transceivers
Features
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 (VL) 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}
Applications
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}
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.
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.
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
Typical Application
RS485 Link With Large Ground Loop Voltage
LTC2865 Receiving 10Mbps ±200mV Differential
Signal with 1MHz ±25V Common Mode Sweep
LTC2862
VCC1
VCC2
LTC2862
A,B
A,B
50V/DIV
RO1
R
RE1
DE1
R
RO2
A-B
R_t
R_t
RE2
A-B
DE2 0.5V/DIV
DI1
D
V GROUND LOOP
GND1
≤25V PEAK
GND2
D
DI2
2862345 TA01a
RO
RO
5V/DIV
100ns/DIV
For more information www.linear.com/LTC2862
2862345 TA01b
2862345fc
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