描述 Description

The MC74AC74/74ACT74 is a dual D-type flip-flop with Asynchronous Clearand Set inputs and complementary (Q,Q) outputs. Information at the input istransferred to the outputs on the positive edge of the clock pulse. Clock triggering occurs at a voltage level of the clock pulse and is not directly related to the transition time of the positive-going pulse. After the Clock Pulse input threshold voltage hasbeen passed, the Data input is locked out and information present will not betransferred to the outputs until the next rising edge of the Clock Pulse input. Asynchronous Inputs: LOW input to SD (Set) sets Q to HIGH level LOW input to CD (Clear) sets Q to LOW level Clear and Set are independent of clock Simultaneous LOW on CD and SD makes both Q and Q HIGH

特性 Features

? Outputs Source/Sink 24 mA
? ACT74 Has TTL Compatible Inputs CD1SD2 D1Q1CP2Q2
? Pb-Free Packages Are Available

簡介

MC74AC74屬于集成電路（IC）的觸發(fā)器。由制造生產(chǎn)的MC74AC74觸發(fā)器觸發(fā)器是能夠存儲單個邏輯狀態(tài)或信息“位”的基本數(shù)字存儲器件。這些器件至少有兩個輸入；一個或多個用于傳遞要存儲的數(shù)據(jù)，另一個用于指示存儲該數(shù)據(jù)的時間點。不同的觸發(fā)器類型，例如 D（延遲）、SR（置位復位）和 JK，對提供給其輸入的信號有不同的響應，可用于實現(xiàn)不同的邏輯功能。這些器件與鎖存器的不同之處在于它們是邊緣敏感器件，其保持的邏輯狀態(tài)僅在接收到有效時鐘信號時才會改變。