74hc574功能真值表及引脚管脚图：

74hc574英文资料介绍：

74HC574 pdf datasheet

Notes

1. H = HIGH voltage level

h = HIGH voltage level one set-up time prior to the LOW-to-HIGH

CP transition

L = LOW voltage level

l = LOW voltage level on set-up time prior to the LOW-to-HIGH

CP transition

Z = HIGH impedance OFF-state

- = LOW-to-HIGH clock transition