![](/html/ST-Microelectronics/471517/page6.png)
M54HC540
Figure 3: Test Circuit
tPLH, tPHL
tPZL, tPLZ
tPZH, tPHZ
TEST
CL = 50pF/150pF or equivalent (includes jig and probe capacitance)
R1 = 1KΩ or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
Figure 4: Waveform - Propagation Delay Times (f=1MHz; 50% duty cycle)
SWITCH
Open
VCC
GND
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