The DM74LS574N is a high speed low power octal
flip-flop with a buffered common Clock (CP) and a buffered common Output Enable (OE). The information presented to the D inputs is stored in the flip-flops on the LOW-to-HIGH Clock (CP) transition. This device is functionally identical to the 'LS374 except for the pinouts.
20 pin DIP. Manufactured by National.