74HC14 circuit diagram and information

The role of 74HC14: Six inverted Schmitt trigger

Truth table: Y=A

Input input output output AYLHHL

Figure 1 Pin functions

Limit parameters:

Supply Voltage Supply Voltage 7VInput Voltage Input Voltage 7VOperating Free Air Temperature Range Free Air Temperature Range 0℃ to +70℃ Storage Temperature Range Storage Temperature Range -65℃ to +150℃

Recommended Operating ConditionsRecommended Operating Conditions

Symbol Parameter Parameter Minimum Typical Maximum UNIT Unit VCCSupply Voltage Supply voltage 4.7555.25VVT+Positive-Going Input Threshold Voltage Forward input threshold voltage (Note 2) 1.41.61.9VVT-Negative-Going Input Threshold Voltage Negative input threshold voltage (Note 2)0.50.81VHYSInput Hysteresis Input hysteresis (Note 2)0.40.8-VIOHHIGH Level Output CurrentHigh level output current---0.4mAIOLLOW Level Output CurrentLow level output current--8mATAFree Air Operating TemperatureOperating temperature 0-70℃ Note 2: VCC = 5V.

Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)Symbol Parameter Parameter Conditions Conditions Minimum Typical Maximum UNIT Unit VIInput Clamp Voltage Input clamp voltage VCC = Minimum, II = -18mA---1.5VVOHHIGH Level Output Voltage Output high-level voltage VCC = minimum, IOH = maximum VIL = maximum 2.73.4-VVOLLOW Level Output low-level voltage VCC = minimum, IOL = maximum-0.350.5--Output Voltage Output voltage VIH = minimum---VVCC = Minimum, IOL = 4mA-0.250.4IT+Input Current at Positive-Going Threshold Positive-Going Threshold Input Current VCC = 5V, VI = VT+--0.14-mAIT-Input Current at Negative-Going Threshold Negative-Going Threshold Input Current VCC = 5V, VI = VT---0.18-mAIIInput Current @ MAX Input VoltageInput current@Maximum input voltageVCC = Maximum, VI = 7V--0.1mAIIHHIGH Level Input CurrentInput high-level current VCC = Maximum, VI = 2.7V- -20μAIILLOW Level Input Current input low level current VCC = maximum, VI = 0.4V---0.4mAIOSShort Circuit Output Current short circuit output current VCC = maximum (Note 4)-20--100mAICCHSupply Current with Out puts HIGH high level output Supply current VCC = Maximum -8.616mAICCLSupply Current with Outputs LOW Low level output power supply current VCC = Maximum -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 at VCC = 5V and TA = 25℃

Switching Characteristics at VCC = 5V and TA = 25℃Symbol

Parameter Parameter

RL = 2kΩ UNIT Unit CL = 15pFCL = 50pF Minimum Maximum Minimum Maximum tPLHPropagation Delay Time LOW-to-HIGH Level Output low to high level output transfer delay time 522825nstPHLPropagation Delay Time HIGH-to-LOW Level Output high to low level output transfer Delay time 5221033ns

Application circuit:

Figure 2 Photoelectric coupler receiving and shaping circuit

Figure 3 Square wave oscillator