1746-IC16
1746-IC16
CMOS和TTL集成門(mén)電路在實(shí)際使用時(shí)經(jīng)常遇到這樣一個(gè)問(wèn)題,即輸入端有多余的,如何正確處理這些多余的輸入端才能使電路正常而穩(wěn)定的工作?本文給出了解決這個(gè)問(wèn)題的方法,供大家參考。
CMOS門(mén)電路
CMOS門(mén)電路一般是由MOS管構(gòu)成,由于MOS管的柵極和其它各極間有絕緣層相隔,在直流狀態(tài)下,柵極無(wú)電流,所以靜態(tài)時(shí)柵極不取電流,輸入電平與外接電阻無(wú)關(guān)。由于MOS管在電路中是一壓控元件,基于這一特點(diǎn),輸入端信號(hào)易受外界干擾,所以在使用CMOS門(mén)電路時(shí)輸入端特別注意不能懸空。在使用時(shí)應(yīng)采用以下方法:
與門(mén)和與非門(mén)電路
由于與門(mén)電路的邏輯功能是輸入信號(hào)只要有低電平,輸出信號(hào)就為低電平,只有全部為高電平時(shí),輸出端才為高電平。而與非門(mén)電路的邏輯功能是輸入信號(hào)只要有低電平,輸出信號(hào)就是高電平,只有當(dāng)輸入信號(hào)全部為高電平時(shí),輸出信號(hào)才是低電平。所以某輸入端輸入電平為高電平時(shí),對(duì)電路的邏輯功能并無(wú)影響,即其它使用的輸入端與輸出端之間,仍具有與或者與非邏輯功能。這樣對(duì)于CMOS與門(mén)、與非門(mén)電路的多余輸入端就應(yīng)采用高電平,即可通過(guò)限流電阻(500Ω)接電源。
或門(mén)、或非門(mén)電路
或門(mén)電路的邏輯功能是輸入信號(hào)只要有高電平輸出信號(hào)就為高電平,只有輸入信號(hào)全部為低電平時(shí),輸出信號(hào)才為低電平。而或非門(mén)電路的邏輯功能是輸入信號(hào)只要有高電平,輸出信號(hào)就是低電平,只有當(dāng)輸入信號(hào)全部是低電平時(shí)輸出信號(hào)才是高電平。這樣當(dāng)或門(mén)或者或非門(mén)電路某輸入端的輸入信號(hào)為低電平時(shí),并不影響門(mén)電路的邏輯功能。所以或門(mén)和或非門(mén)電路多余輸入端的處理方法應(yīng)是將多余輸入端接低電平,即通過(guò)限流電阻(500Ω)接地。
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:歐工
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