NB4N840M 2 x 2 Crosspoint Switch, Dual, 3.3 V, 3.2 Gb/s, with CML Outputs Description NB4N840M Table 1. TRUTH TABLE SELA0/SELB0 SELA1/SELB1 ENA0/ENA1 ENB0/ENB1 QA0/QB0 QA1/QB1 Function L L H H DA0/DB0 DA0/DB0 1:2 Fanout L H H H DA0/DB0 DA1/DB1 Quad Repeater H L H H DA1/DB1 DA0/DB0 Crosspoint Switch H H H H DA1/DB1 DA1/DB1 1:2 Fanout X X L L Disable/Power Down Disable/Power Down No output ( V ) CC 32 31 30 29 28 27 26 25 1 24 ENB1 GND DB1 V 2 23 CC 3 22 DB1 QA0 ENB0 QA0 4 21 NB4N840M 5 20 SELB0 V CC DB0 6 19 QA1 DB0 QA1 7 18 8 17 SELB1 V CC 9 10 11 12 1314 1516 Figure 2. Pin Configuration (Top View)