The CD74FCT564 and CD74FCT574 are octal D-Type, three-state, positive edge triggered flip-flops which use a small geometry BiCMOS technology. The output stage is a combination of bipolar and CMOS transistors that limits the output HIGH level to two diode drops below VCC. This resultant lowering of output swing (0V to 3.7V) reduces power bus ringing (a source of EMI) and minimizes VCC bounce and ground bounce and their effects during simultaneous output switching. The output configuration also enhances switching speed and is capable of sinking 48 milliamperes. The eight flip-flops enter data into their registers on the LOW to HIGH transition of the clock (CP). The Output Enable (OE) controls the three state outputs and is independent of the register operation. When the Output Enable (OE) is HIGH, the outputs are in the high impedance state. The CD74FCT564 and CD74FCT574 share the same configurations; the CD74FCT564, however, has inverted outputs and the CD74FCT574 has noninverted outputs.