The ISL59424 and ISL59445 are 1GHz bandwidth multiplexing amplifiers designed primarily for video input switching. These MUX-amps exhibit a fixed gain of 1 and also feature a high speed three-state to enable the output of multiple devices to be wired together. All logic inputs have pull-downs to ground and may be left floating. The EN pin, when pulled high, sets the ISL59424 and ISL59445 in to low current mode - consuming just 15mW. An added feature in the ISL59424 is a latch enable function (LE) that allows independent logic control using a common logic bus. When LE is high the last logic state is preserved. ISL59424EVAL1 Evaluation Board User’s Guide Application Note April 19, 2005 AN1183.0 Introduction High Frequency Layout Considerations The ISL59424EVAL1 evaluation board contains all the At frequencies of 500MHz and higher, circuit board layout circuitry needed to measure critical performance parameters may limit performance. The following layout guidelines are of the ISL59424 1GHz triple 2:1 MUX-amplifier, over a implemented on the evaluation board: variety of applications. ……