The LTC1686/LTC1687 are high speed, precision delay, full-duplex RS485 transceivers that can operate at data rates as high as 52Mbps. The devices also meet 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 LTC1686/LTC1687 RS485 transceivers guarantee receiver fail-safe operation over the entire common mode range (–7V to 12V). Receiver input resistance remains ≥22k when the device is unpowered or disabled. The LTC1686/LTC1687 operate from a single 5V supply and draw only 7mA of supply current. Applications * High Speed RS485/RS422 Full Duplex Transceivers * Level Translator * Backplane Transceiver * STS-1/OC-1 Data Transceiver * Signal Repeaters * Precision Propagation Delay Over Temperature: Receiver/Driver: 18.5ns ±3.5ns * High Data Rate: 52Mbps * Low tPLH/tPHL Skew: Receiver/Driver: 500ps Typ * –7V to 12V RS485 Input Common Mode Range * Guaranteed Fail-Safe Operation Over the Entire Common Mode Range * High Input Resistance: ≥22k, Even When Unpowered * Short-Circuit Protected * Thermal Shutdown Protected * Driver Maintains High Impedance in Three-State or with Power Off * Single 5V Supply * Pin Compatible with LTC490/LTC491 * 45dB CMRR at 26MHz https://elecena.pl/product/251939/52mbps-precision-delay-rs485-fail-safe-transceivers 2007-03-02 https://elecena.pl/product/251939/52mbps-precision-delay-rs485-fail-safe-transceivers 2014-04-23 https://elecena.pl/product/251939/52mbps-precision-delay-rs485-fail-safe-transceivers 2025-01-17