74LCX125 Datasheet, PDF (5/12 Pages) Fairchild Semiconductor – Low Voltage Quad Buffer with 5V Tolerant Inputs and Outputs

Figure 3: Test Circuit
74LCX125
t_PLH, t_PHL
t_PZL, t_PLZ
t_PZH, t_PHZ
TEST
C_L = 50 pF or equivalent (includes jig and probe capacitance)
R_L = R1 = 500Ω or equivalent
R_T = Z_OUT of pulse generator (typically 50Ω)
Figure 4: Waveform - Propagation Delay (f=1MHz; 50% duty cycle)
SWITCH
Open
6V
GND
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