74HC14的作用：六反相斯密特觸發(fā)器

真值表：Y=A

Input輸入output輸出AYLHHL

圖1 引腳功能

極限參數(shù)：

Supply Voltage 電源電壓7VInput Voltage輸入電壓7VOperating Free Air Temperature Range自由空氣溫度范圍0℃ to +70℃Storage Temperature Range儲存溫度范圍-65℃ to +150℃

Recommended Operating Conditions建議操作條件

Symbol 符號Parameter 參數(shù)最小典型最大UNIT 單位VCCSupply Voltage 電源電壓4.7555.25VVT+Positive-Going Input Threshold Voltage 正向輸入閾值電壓(Note 2)1.41.61.9VVT-Negative-Going Input Threshold Voltage 反向輸入閾值電壓(Note 2)0.50.81VHYSInput Hysteresis 輸入滯后(Note 2)0.40.8-VIOHHIGH Level Output Current高電平輸出電流---0.4mAIOLLOW Level Output Current低電平輸出電流--8mATAFree Air Operating Temperature工作溫度0-70℃Note 2: VCC = 5V.

Electrical Characteristics 電氣特性over recommended operating free air temperature range (unless otherwise noted)Symbol 符號Parameter 參數(shù)Conditions 條件最小典型最大UNIT 單位VIInput Clamp Voltage輸入鉗位電壓VCC = 最小, II = -18mA---1.5VVOHHIGH Level Output Voltage輸出高電平電壓VCC=最小,IOH=最大 VIL=最大2.73.4-VVOLLOW Level輸出低電平電壓VCC = 最小, IOL = 最大-0.350.5--Output Voltage輸出電壓VIH = 最小---VVCC = 最小, IOL = 4mA-0.250.4IT+Input Current at Positive-Going Threshold 正向閾值輸入電流VCC = 5V, VI = VT+--0.14-mAIT-Input Current at Negative-Going Threshold反向閾值輸入電流VCC = 5V, VI = VT---0.18-mAIIInput Current @ MAX Input Voltage輸入電流@最大輸入電壓VCC = 最大, VI = 7V--0.1mAIIHHIGH Level Input Current輸入高電平電流VCC = 最大, VI = 2.7V--20μAIILLOW Level Input Current輸入低電平電流VCC = 最大, VI = 0.4V---0.4mAIOSShort Circuit Output Current短路輸出電流VCC = 最大 (Note 4)-20--100mAICCHSupply Current with Out puts HIGH高電平輸出電源電流VCC = 最大-8.616mAICCLSupply Current with Outputs LOW低電平輸出電源電流VCC = 最大-1221mANote 3: VCC = 5V, TA = 25℃.Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second.

Switching Characteristics開關(guān)特性 at VCC = 5V and TA = 25℃

Switching Characteristics開關(guān)特性at VCC = 5V and TA = 25℃Symbol 符號

Parameter 參數(shù)

RL = 2kΩ UNIT 單位CL = 15pFCL = 50pF最小最大最小最大tPLHPropagation Delay Time LOW-to-HIGH Level Output低到高電平輸出傳遞延遲時間522825nstPHLPropagation Delay Time HIGH-to-LOW Level Output高到低電平輸出傳遞延遲時間5221033ns

應(yīng)用電路：

圖2 光電藕合器接收整形電路

圖3 方波振蕩器