Fig. 8 Switching Speed Test Circuit
C 2
5V
R 1
R 2
Pulse
Generator
V O = 5V
f = 10 KHz
d.c. = 50%
C 1
.1 uf
bypass
GND
0 mA
R 1 = 360 Ω
R 2 = 180 Ω
Fig. 9 Switching Times Definition for Buffers
50%
C 1 = 15 pf
C 2 = 20 pf
0 mA
C 1 and C 2 include probe and
stray wire capacitance
Fig. 10 Switching Times Definition for Inverters
50%
t PLH
t PHL
t PHL
t PLH
V OH
Output
90%
10%
V OH
Output
10%
90%
V O
50%
V O
90%
10%
V OL
t r
10%
t f
90%
t f
V OL
t r
?1.0.1 Fairchild Semiconductor Corporation
QSE256, QSE257, QSE258, QSE259 Rev. 1.0.1
6
www.fairchildsemi.com
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