Rainbow Electronics BU4538B - Manual (Page 4)

4
Standard ICs BU4538B
•
Timing chart
t W t W t 2 t 3 t W t 1
A
B
C D
Q
Q
t
1,
t
2,
t
3
< t
W
•
Measurement circuits
P. G. P. G. P. G. C L C L
V DD
R X
C X
C D
A
V DD T 2 T 1
B
Q
Q
Fig. 1 (a) Switching time
V SS
A
B
C D
Q
Q
50%
90%
50%
10%
20ns 20ns
50%
50% 50%
50% 50%
50% 50%
50%
20ns 20ns
t rr
90%
10%
90%
50%
10%
20ns 20ns
t PLH
t PHL t PHL
t WOUT t PLH t THL
t TLH
t TLH t PHL
t THL t PHL
90%
90%
10%
10%
90%
10%
50%
t WOUT
Fig. 1 (b) Switching time measurement waveforms