Dual Comparator/Terminator with Cable-Droop Compensation

The MAX9955 high-speed, dual comparator/terminator IC includes a dual comparator and a terminator for each channel. The dual comparator features programmable cable-droop compensation at its input and offers low dispersion (timing variation) over a wide variety of input conditions, programmable hysteresis, and differential outputs. The terminator provides a 50Ω buffered termination to a programmed level. The MAX9955 comparator operating range is -1.1V to +3.6V, and the terminator operating range is -1.0V to +3.5V.

The MAX9955 comparator provides high-speed, open-collector outputs with internal 50Ω termination resistors that are compatible with doubly terminated 0.4VP-P (typ) CML. These features significantly reduce the discrete component count on the circuit board.

The MAX9955 power dissipation is only 800mW per channel under static conditions and 850mW per channel at 2Gbps toggling conditions. The device is available in a 64-pin, 10mm x 10mm body and 0.5mm pitch TQFP. A 5mm x 5mm exposed die paddle on the top of the package facilitates efficient heat removal. The device is specified to operate with an internal die temperature of +50°C to +90°C, and features a die temperature monitor output.

Applications

* High-Performance Memory Automated Test Equipment (DDR3, GDDR3, GDDR4) * High-Performance SOC Automated Test Equipment

* Cable-Droop Compensation

* 55ps Input Equivalent Rise/Fall Time

* 190ps Minimum Pulse Width

* Low Power Dissipation

* 850mW per Channel at 2Gbps (typ)

* Low Timing Dispersion

* Integrated Terminator

* Comparator Hysteresis Control from 0 to 10mV