The LTC1685 is a high speed, precision delay RS485 transceiver that can operate at data rates as high as 52Mbps. The device also meets the requirements of RS422.

A unique architecture provides very stable propagation delays and low skew over a wide common mode and ambient temperature range.

The driver and receiver feature three-state outputs, with disabled driver outputs maintaining high impedance over the entire common mode range. A short circuit feature detects shorted outputs and substantially reduces driver output current. A similar feature also protects the receiver output from short circuits. Thermal shutdown circuitry protects from excessive power dissipation.

The receiver has a fail-safe feature that guarantees a high output state when the inputs are shorted or are left floating. The LTC1685 RS485 transceiver guarantees receiver fail-safe operation over the entire common mode range (–7V to 12V). Input resistance will remain ≥22k when the device is unpowered or disabled.

The LTC1685 operates from a single 5V supply and draws only 7mA of supply current.

Applications

• High Speed RS485/RS422 Transceivers
• Level Translator
• Backplane Transceiver
• STS-1/OC-1 Data Transceiver
• Fast-20, Fast-40 SCSI Transceivers

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.