接口定义
74hc574功能真值表及引脚管脚图
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
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