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PULSE
GENERATOR
VDD
14
INPUT
7 VSS
OUTPUT
CL
20 ns
INPUT
tPHL
OUTPUT
90%
50%
10%
90%
50%
10%
tTHL
Figure 1. Switching Time Test Circuit and Waveforms
20 ns
VDD
VSS
tPLH
VOH
VOL
tTLH
VH
VDD
VH
VDD
Vin
Vin
VSS
VSS
VDD
VDD
Vout
VSS
(a) Schmitt Triggers will square up
(a) inputs with slow rise and fall times.
Vout
VSS
(b) A Schmitt trigger offers maximum
(b) noise immunity in gate applications.
Figure 2. Typical Schmitt Trigger Applications
MOTOROLA CMOS LOGIC DATA
MC14093B
3