Ultra-fast Ecl-output Comparator With Latch Enable Integrated Products

The MAX9685 is an ultra-fast ECL Comparator manufac- tured with a high-frequency bipolar process (fT = 6GHz) capable of very short propagation delays. This design maintains the excellent DC matching characteristics nor- mally found only in slower Comparators The device is pin-compatible with the AD9685 and Am6685, but exceeds their AC characteristics. The MAX9685 has differential inputs and complemen- tary outputs that are fully compatible with ECL-logic lev- els. Output current levels are capable of driving 50 terminated transmission lines. The ultra-fast operation makes signal processing possible at frequencies in excess of 600MHz. A latch-enable (LE) function is provided to allow the Comparator to be used in a sample-hold mode. When LE is ECL high, the Comparator functions normally. When LE is driven ECL low, the outputs are forced to an unambiguous ECL-logic state, dependent on the input conditions at the time of the latch input transition. If the latch-enable function is not used, the LE pin must be connected to ground. By Maxim Integrated Products