74HC14中文資料
74HC14的作用:六反相斯密特觸發器
74HC14引腳圖:
圖1 引腳功能
74HC14真值表:
真值表:Y=A
Input輸入 | output輸出 |
A | Y |
L | H |
H | L |
74HC14電氣參數:
極限參數:
Supply Voltage 電源電壓 | 7V |
Input Voltage輸入電壓 | 7V |
Operating Free Air Temperature Range自由空氣溫度範圍 | 0℃ to +70℃ |
Storage Temperature Range儲存溫度範圍 | -65℃ to +150℃ |
Recommended Operating Conditions建議操作條件
Symbol 符號 | Parameter 參數 | 最小 | 典型 | 最大 | UNIT 單位 |
VCC | Supply Voltage 電源電壓 | 4.75 | 5 | 5.25 | V |
VT+ | Positive-Going Input Threshold Voltage 正向輸入閾值電壓(Note 2) | 1.4 | 1.6 | 1.9 | V |
VT- | Negative-Going Input Threshold Voltage 反向輸入閾值電壓(Note 2) | 0.5 | 0.8 | 1 | V |
HYS | Input Hysteresis 輸入滯后(Note 2) | 0.4 | 0.8 | - | V |
IOH | HIGH Level Output Current高電平輸出電流 | - | - | -0.4 | mA |
IOL | LOW Level Output Current低電平輸出電流 | - | - | 8 | mA |
TA | Free 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 | Conditions 條件 | 最小 | 典型 | 最大 | UNIT 單位 |
VI | Input Clamp Voltage輸入鉗位電壓 | VCC = 最小, II = -18mA | - | - | -1.5 | V |
VOH | HIGH Level Output Voltage輸出高電平電壓 | VCC=最小,IOH=最大 VIL=最大 | 2.7 | 3.4 | - | V |
VOL | LOW Level輸出低電平電壓 | VCC = 最小, IOL = 最大 | - | 0.35 | 0.5 | - |
- | Output Voltage輸出電壓 | VIH = 最小 | - | - | - | V |
VCC = 最小, IOL = 4mA | - | 0.25 | 0.4 | |||
IT+ | Input Current at Positive-Going Threshold 正向閾值輸入電流 | VCC = 5V, VI = VT+ | - | -0.14 | - | mA |
IT- | Input Current at Negative-Going Threshold反向閾值輸入電流 | VCC = 5V, VI = VT- | - | -0.18 | - | mA |
II | Input Current @ MAX Input Voltage輸入電流@最大輸入電壓 | VCC = 最大, VI = 7V | - | - | 0.1 | mA |
IIH | HIGH Level Input Current輸入高電平電流 | VCC = 最大, VI = 2.7V | - | - | 20 | μA |
IIL | LOW Level Input Current輸入低電平電流 | VCC = 最大, VI = 0.4V | - | - | -0.4 | mA |
IOS | Short Circuit Output Current短路輸出電流 | VCC = 最大 (Note 4) | -20 | - | -100 | mA |
ICCH | Supply Current with Out puts HIGH高電平輸出電源電流 | VCC = 最大 | - | 8.6 | 16 | mA |
ICCL | Supply Current with Outputs LOW低電平輸出電源電流 | VCC = 最大 | - | 12 | 21 | mA |
Note 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開關特性 at VCC = 5V and TA = 25℃
Switching Characteristics開關特性 | ||||||
at VCC = 5V and TA = 25℃ | ||||||
Symbol 符號 | Parameter 參數 | RL = 2kΩ | UNIT 單位 | |||
CL = 15pF | CL = 50pF | |||||
最小 | 最大 | 最小 | 最大 | |||
tPLH | Propagation Delay Time LOW-to-HIGH Level Output低到高電平輸出傳遞延遲時間 | 5 | 22 | 8 | 25 | ns |
tPHL | Propagation Delay Time HIGH-to-LOW Level Output高到低電平輸出傳遞延遲時間 | 5 | 22 | 10 | 33 | ns |
採用施密特觸發器74HC14的光耦接收整形電路:
圖2 光電耦合器接收整形電路
採用施密特觸發器74HC14的方波振蕩器電路
圖3 方波振蕩器
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