Summary of Linear has transceiver that is reliable in the field
The LTC2862–LTC2865 are low-power RS485/RS422 transceivers offering ±60V overvoltage protection on data lines during all operations, including power-down. They support 20Mbps or 250kbps data rates with enhanced ESD protection (±15kV HBM). These devices feature an extended ±25V common-mode range and full failsafe operation, ensuring reliability in noisy environments and large ground loops. Available in DFN and leaded packages, they eliminate the need for external protection devices in industrial, automotive, and medical applications.
Parts used in the LTC2862-LTC2865 Transceiver Project:
- LTC2862
- LTC2863
- LTC2864
- LTC2865
- DFN Package
- Leaded Package
- Logic Supply Pin (VL)
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 failsafe operation improve data communication reliability in electrically noisy environments and in the presence of large ground loop voltages.
Features
- 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 (VL) 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
- 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
Linear Technology has a range of rugged, high voltage tolerant RS485/RS422 transceivers which it says can eliminate field failures without the need of costly external protection devices.
In practical RS485 systems, installation cross-wiring faults, ground voltage faults or lightning induced surge voltages can cause overvoltage conditions that exceed absolute maximum ratings of typical transceivers.
The LTC2862-2865 feature ±60V overvoltage fault protection on the data transmission lines, protecting bus pins during operation and power shutdown. Whether a circuit is transmitting, receiving, in standby or powered off, the LTC2862-2865 tolerate any voltage within ±60V without damage, increasing the robustness of any typical RS485 network.
The low power family supports fast 20Mbit/s and low-EMI slew-rate-limited 250kbit/s data rates, as well as half- and full-duplex versions.
The LTC2862-2865 family provides protection and reliability for a variety of RS485/RS422 applications, including industrial control, instrumentation networks and automotive electronics.
An extended ±25V input common-mode range and full failsafe operation improve data communications reliability in electrically noisy environments and in the presence of ground loop voltages. This extended common-mode range allows the LTC2862-2865 devices to transmit and receive under harsh conditions that would otherwise cause data errors and possible device damage.
Enhanced ESD protection allows these devices to withstand ±15kV (HBM and IEC-1000-4-2 air discharge) on the transceiver pins without latchup or damage; all other pins are protected to ±8kV HBM. Fully symmetric receiver thresholds allow the devices to maintain good duty cycle symmetry at low signal levels and boost receiver noise immunity.
For more read: Linear has transceiver that is reliable in the field
- What voltage supply do these transceivers operate on?
The devices operate on 3V to 5.5V supplies. - How much overvoltage fault protection is provided on the data lines?
The parts feature ±60V overvoltage fault protection on the data transmission lines. - Can these transceivers withstand high electrostatic discharge events?
Yes, they allow ±15kV HBM on the transceiver interface pins without latchup or damage. - What is the maximum data rate supported by this family?
The family supports fast 20Mbit/s data rates. - Does the device offer protection when powered down?
Yes, the parts tolerate any voltage within ±60V without damage even during power shutdown. - What is the input common mode range of these components?
The devices have an extended ±25V input common mode range. - Are there versions available with low electromagnetic interference?
Yes, logic-selectable 250kbps modes with low EMI slew rate limited data transmission are available. - Which industries commonly use these transceivers?
They are used in SCADA, industrial control, automotive electronics, building automation, and medical equipment.
