50Mbps Precision Quad Line Receiver

The LTC1520 is a high speed, precision differential line receiver that can operate at data rates as high as 50Mbps. A unique architecture provides very stable propagation delays and low skew over a wide input common mode, input overdrive and ambient temperature range. Propagation delay is 18ns ±3ns, while typically tPLH/tPHL skew is 500ps and channel-to-channel skew is 400ps.

Each receiver translates differential input levels (VID ≥ 100mV) into valid CMOS and TTL output levels. Its high input resistance (≥18k) allows many receivers to be connected to the same driver. The receiver outputs go into a high impedance state when disabled.

Protection features include thermal shutdown and a controlled maximum short-circuit current (50mA max) that does not oscillate in and out of short-circuit mode. Input resistance remains ≥18k when the device is unpowered or disabled, thus allowing the LTC1520 to be hot swapped into a backplane without loading the data lines.

The LTC1520 operates from a single 5V supply and draws 12mA of supply current. The part is available in a 16-lead narrow SO package.

Applications

* High Speed Backplane Interface

* Line Collision Detector

* PECL and LVDS Line Receivers

* Level Translator

* Ring Oscillator

* Tapped Delay Line

* Precision Propagation Delay: 18ns ±3ns Over Temperature

* Data Rate: 50Mbps

* Low tPLH/tPHL Skew: 500ps Typ

* Low Channel-to-Channel Skew: 400ps Typ

* Rail-to-Rail Input Common Mode Range

* High Input Resistance: ≥18k, Even When Unpowered

* Hot Swap Capable

* Can Withstand Input DC Levels of ±10V

* Short-Circuit Protected

* Single 5V Supply

* LVDS Compatible

* Will Not Oscillate with Slow Input Signals