LTC1685CS8

Product Summary

The LTC1685CS8 is a high speed, precision delay RS485 transceiver that can operate at data rates as high as 52Mbps. The LTC1685CS8 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 of LTC1685CS8 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. The receiver of LTC1685CS8 has a fail-safe feature that guarantees a high output state when the inputs are shorted or are left floating. The LTC1685CS8 RS485 transceiver guarantees receiver failsafe operation over the entire common mode range (–7V to 12V). Input resistance will remain ≥22k when the device is unpowered or disabled.

Parametrics

LTC1685CS8 absolute maximum ratings: (1)Supply Voltage (VDD): 10V; (2)Control Input Currents: –10mA to 100mA; (3)Control Input Voltages: –0.5V to VDD+0.5V; (4)Driver Input Voltages: –0.5V to VDD+0.5V; (5)Driver Output Voltages: +12V/–7V; (6)Receiver Input Voltages: +12V/–7V; (7)Receiver Output Voltages: –0.5V to VDD+0.5V; (8)Receiver Input Differential: 10V; (9)Short-Circuit Duration (Driver VOUT: –7V to 10V; (10)Operating Temperature Range: 0℃ to 70℃; (11)Storage Temperature Range: –65℃ to 150℃; (12)Lead Temperature (Soldering, 10 sec): 300℃.

Features

LTC1685CS8 features: (1)Precision Propagation Delay Over Temperature: Receiver/Driver: 18.5ns ±3.5ns; (2)High Data Rate: 52Mbps; (3)Low tPLH/tPHL Skew: Receiver/Driver: 500ps Typ; (4)–7V to 12V RS485 Input Common Mode Range; (5)Guaranteed Fail-Safe Receiver Operation Over the Entire Common Mode Range; (6)High Receiver Input Resistance: ≥22k, Even When Unpowered; (7)Short-Circuit Protected; (8)Thermal Shutdown Protected; (9)Driver Maintains High Impedance inThree-State or with Power Off; (10)Single 5V Supply; (11)PinCompatible with LTC485; (12)45dB CMRR at 26MHz.

Diagrams