Features

• Precision Propagation Delay: 18.5ns ±3.5ns Over 0°C to 70°C Temperature Range
• Data Rate: 52Mbps
• Low t_PLH/t_PHL Skew: 500ps Typ
• Low Channel-to-Channel Skew: 500ps Typ
• -7V to 12V RS485 Input Common Mode Range
• Input Resistance >/=22k, Even When Unpowered
• Guaranteed Fail-Safe Operation over the Entire Common Mode Range
• Hot Swap™ Capable
• High Common Mode Rejection to 26MHz
• Short-Circuit Protection: 10mA Typ Output Current for an Indefinite Short
• Three-State Output Capability
• Will Not Oscillate with Slow Moving Input Signals
• Single 5V Supply
• Pin Compatible with LTC488, LTC489

Typical Application

Description

The LTC®1518/LTC1519 are high speed, precision delay differential quad bus/line receivers that can operate at data rates as high as 52Mbps. They are pin compatible with the LTC488/LTC489 RS485 line receivers and operate over the entire –7V to 12V common mode range. A unique architecture provides very stable propagation delays and low skew over wide input common mode, input overdrive and ambient temperature ranges. Propagation delay is 18.5ns ±3.5ns over the commercial temperature range. Typical t_PLH/t_PHL and channel-to-channel skew is 500ps.

Each receiver translates differential input levels (|V_ID| >= 300mV) into valid CMOS and TTL output levels. Its high input resistance (>=22k) allows many receivers to be connected to the same driver. The receiver outputs go into a high impedance state when disabled. The receivers have a fail-safe feature that guarantees a high output state when the inputs are shorted or left floating. Other protection features include thermal shutdown and a controlled maximum short-circuit current (50mA Max). Input resistance remains >=22k when the device is unpowered or disabled, thus allowing hot swapping without loading the data lines.

The LTC1518/LTC1519 operate from a single 5V supply and draw 12mA of supply current.