HD74HC574 Datasheet, Renesas

* High Speed Operation: tpd (Clock to Output) = 13 ns typ (CL = 50 pF)
* High Output Current: Fanout of 15 LSTTL Loads
* Wide Operating Voltage: VCC = 2 to .

These devices are positive edge triggered flip-flops. The difference between HD74HC564 and HD74HC574 is only that the former has inverting outputs and the latter has noninvertering outputs. Data at the D inputs, meeting the set-up and hold time requ.