High Input Impedance Supports 256 Nodes (C-, I-Grade)
Operation Up to 125°C (H-Grade)
Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range
Current Limited Drivers and Thermal Shutdown
Delayed Micropower Shutdown: 5µA Maximum (C-, I-Grade)
Power Up/Down Glitch-Free Driver Outputs
Low Operating Current: 370µA Typical in Receive Mode
Compatible with TIA/EIA-485-A Specifications
Available in 10-Pin 3mm × 3mm DFN, 12-Pin 4mm × 3mm DFN and 16-Pin SSOP Packages
APPLICATIONS
Low Power RS485/RS422 Transceiver
Level Translator
Backplane Transceiver
DESCRIPTION
The LTC®2854 and LTC2855 are low power, 20Mbps RS485/RS422 transceivers operating on 3.3V supplies. The receiverincludes a logic-selectable 120Ω termination, one-eighth unit load supporting up to 256 nodes per bus (C-, I-Grade), and a failsafe feature that guarantees a high output state under conditions offloating or shorted inputs.
The driver maintains a high output impedance over the entire common mode range when disabled or when the supply is removed. Excessivepowerdissipationcausedby bus contention or a fault is prevented by current limiting all outputs and by a thermal shutdown.
EnhancedESDprotectionallows theLTC2854towithstand ±25kV (humanbodymodel) and theLTC2855towithstand ±15kV on the transceiver interface pins without latchup or damage.
