PI90LV044 and PI90LVB044 are monolithic dual 2x2 asynchronous sequential crossover/repeater switches. The crossover function is based on the multiplexer tree structure. Each 2x2 switch can be viewed as a pair of 2:1 multiplexers that share the same input. The signal path through each switch is completely differential, with minimal support genetic delay.
Block Diagram
The signal path is unregistered, so no clock is required for data entry. Signal line drivers and receivers use low-voltage differential signaling (LVDS) to achieve signaling rates up to 650Mbps. The LVDS standard provides a minimum differential output voltage of 247 mV for 100Ω loads and a geopopotential difference of up to 1V between the transmitter and receiver to receive a 100 mV signal. PI90LVB044 doubles the output drive current to achieve LVDS level at 50 ohm load.
Pin configuration
The intended applications of these devices are loop-through and redundant channel switching for point-to-point baseband (PI90LV044) and multipoint (PI90LVB044) data transmission over controlled impedance media
