74FST3257_11 Datasheet, PDF (5/8 Pages) ON Semiconductor – Quad 2:1 Multiplexer/ Demultiplexer Bus Switch

74FST3257
AC Loading and Waveforms
V_I
FROM
OUTPUT
UNDER
TEST
500 W
C_L* ^{500 W}
NOTES:
1. Input driven by 50 W source terminated in 50 W.
2. CL includes load and stray capacitance.
*C_L = 50 pF
Figure 4. AC Test Circuit
SWITCH
INPUT
10 %
t_PLH
t_f = 2.5 nS
90 %
1.5 V
90 %
1.5 V
OUTPUT
1.5 V
t_f = 2.5 nS
3.0 V
10 %
GND
t_PLH
V_OH
1.5 V
V_OL
Figure 5. Propagation Delays
ENABLE
INPUT
t_f = 2.5 nS
90 %
1.5 V
t_PZL
OUTPUT
t_PZH
OUTPUT
10 % 10 %
1.5 V
1.5 V
t_f = 2.5 nS
90 % ^{3.0 V}
1.5 V
GND
t_PLZ
V_OL + 0.3 V
V_OL
t_PHZ
V_OH
V_OH − 0.3 V
Figure 6. Enable/Disable Delays
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