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ʱ䣺2022-01-04 09:36:03      Դeeskill

ʱṩġһ˵յģҲͬѧ˵Ĺ



1TTL·COMS·ʱTTL·ĸߵƽCOMS·ĺܵ͸ߵƽһΪ3.5VʱҪTTL˽裬ߵƽֵ

2OCŵ·裬ʹá

3ΪӴŵеĵƬܽҲʹ衣

4COMSоƬϣΪ˷ֹ𻵣õĹܽŲգһ迹ṩйͨ·

5оƬĹܽżƽӶоƬźŵǿ

6ߵĿŸܽվͱȽ׽ĵŸš

7ߴе費ƥ䲨ţǵƥ䣬ЧƷ䲨š

ֵѡԭ:

1ӽԼļоƬĹӦ㹻󣻵󣬵С

2ȷ㹻Ӧ㹻СС

3ڸٵ·ܱرƽۺϿ

,ͨ1k10k֮ѡȡҲƵ

ѡӦϿعԺ¼·Խ趨ҪҪ¼أ

1 빦ĵƽ⡣Ϊһ˵ԽСԽǿԽӦע֮ľ⡣

2 ¼·ͬΪߵƽʱعܶϿӦʵѡܹ¼·ṩ㹻ĵ

3 ߵ͵ƽ趨ͬ·ĸߵ͵ƽżƽвͬӦʵ趨ȷܵѹֵӦȷƽż֮¡

4 ƵԡΪͿع©Դ֮ĵݺ¼·֮ݻγRCӳ٣ԽӳԽ趨Ӧǵ·ⷽ

趨ԭһġ

OCߵƽʱһ̬Ҫṩÿ˿ڲ100uA,Լ500uA׼ѹ5Vڵĸߵ͵ƽΪ0.8V(ڴֵΪ͵ƽ)2V(ߵƽֵ)

ѡʱ

500uA x 8.4K= 4.2ѡ8.4Kʱ0.8V£ΪСֵСˡϴֵɼС֤ʱܵ0.8Vɡ

ߵƽʱԹӵ©200uA

200uA x15K=3VѹΪ3Vڿɴﵽ2VֵΪֵܴٴ2Vˡѡ10KáCOMSŵĿɲο74HCϵ

ʱӵ©ɺԣIOʵʵڲͬƽҲDzͬģԭһ仰ΪߵƽʱҪιڣ͵ƽҪιˣĵι˼ڣڵ͵ƽֵͲɿˣ

ֵ·вõŶҪӹ̶ƽͨ1kӸߵƽӵء

1. ã

• ӵΪ˷ֹ
• ⲿоƬĸ
• cmosڵı,һ10mA


1. ıƽĵλTTL-CMOSƥ
2. ʱȷ״̬
3.Ӹߵƽʱ
4ΪOCṩ

• ҪʲôҪߵѹĻڵѹֲҪ衣

• Ķ˿ĬֵΪߵƽҪõ͵ƽ̬ܿŵ·ܵļ缫ȥưĵΪ͵ƽ֮

• ڽӿڵ·,Ϊ˵õȷĵƽ,һַ,Ա֤ȷĵ·״̬,ⷢ,,ڵ,ű۲ֱͨ,ǶͬһƬ,óʼ״̬.ֱֹͨ!

2壺

• ǽȷźͨһǶλڸߵƽͬʱãͬ

• Ƕע

• ǿֵֻͬûʲôϸ

• ڷǼ缫©·͵·ͨŵ·͵ѹ޵ģĹҪΪ缫·͵·ͨ

3ΪʲôҪʹ裺

• һʹʱICûڽӵ裬Ϊʹάڲ״̬Ǵصԭ״̬ICⲿһ衣

• ֵ·״̬ߵƽ͵ƽ͸״̬ЩӦóϲϣָ״̬ͨķʽʹȶ״̬Ҫ

• һ˵I/O˿ڣеĿãеIJãеãеҪӣI/O˿ڵһܵCCͨһ͵Դһʱ򣬸õΪC裬Ҳ˵ö˿ʱΪߵƽCͨһ͵һʱ򣬸õΪ裬ʹö˿ƽʱΪ͵ƽ

磺һĶ˿Ϊ״̬ʱij̬Ϊߵƽڼ͵ƽ롣

• ʱṩġһ˵յģҲͬѧ˵Ĺ

 

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