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MC74LCX14_12 Datasheet, PDF (5/8 Pages) ON Semiconductor – Low Voltage CMOS Hex Schmitt Inverter
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A 50%
tPLH
Y 50% VCC
VCC
GND
tPHL
VOH
VOL
Figure 3. Switching Waveforms
MC74LCX14
PULSE
GENERATOR
VCC
DUT
RT
CL
RL
CL =50 pF at VCC = 3.3 0.3 V or equivalent
(includes jig and probe capacitance)
RL = R1 = 500 W or equivalent
RT = ZOUT of pulse generator (typically 50 W)
Figure 4. Test Circuit
4
3
2
(VT+)
VHtyp
(VT−)
1
2
2.5
3
3.5 3.6
VCC, POWER SUPPLY VOLTAGE (VOLTS)
VHtyp = (VT+ typ) − (VT− typ)
Figure 5. Typical Input Threshold, VT+, VT− versus Power Supply Voltage
(a) A Schmitt−Trigger Squares Up Inputs With Slow Rise and Fall Times
(b) A Schmitt−Trigger Offers Maximum Noise Immunity
VH
Vin
VCC
VT+
VT−
VH
Vin
VCC
VT+
VT−
GND
GND
VOH
VOH
Vout
Vout
VOL
VOL
Figure 6. Typical Schmitt−Trigger Applications
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