The NB100LVEP91 is a triple any level positive input to NECL output translator. The device accepts LVPECL, LVTTL, LVCMOS, HSTL, CML or LVDS signals, and translates them to differential LVNECL output signals (-2.5 V / -3.3 V). To accomplish the level translation the LVEP91 requires three power rails. The VCC pins should be connected to the positive power supply, and the VEE pin should be connected to the negative power supply. The GND pins are connected to the system ground plane. Both VEE and VCC should be bypassed to ground via 0.01 mF capacitors. Under open input conditions, the D input will be biased at VCC/2 and the D input will be pulled to GND. These conditions will force the Q outputs to a low state, and Q outputs to a high state, which will ensure stability.