HD74HC74 Datasheet, PDF (5/8 Pages) Hitachi Semiconductor – Dual D-type Flip-Flops (with Preset and Clear)

HD74HC74
Waveforms
• Waveform − 1
Clock
D
t_r
t_f
10 %
90 %
50 % 50 %
t_w(H)
50 %
10 %
t_w(L)
t_TLH
t_THL
90 %
90 %
Q
50 %
50 %
10 %
10 %
t_PLH
t_PHL
t_PHL
t_PLH
90 %
90 %
Q
50 %
50 %
10 %
10 %
t_THL
t_TLH
• Waveform − 2
t_f
t_r
Clear
Preset
Q
90 %
50 %
10 %
t_w
t_PHL
90 %
50 %
10 %
t_f
50 %
10 %
t_w
t_PLH
t_r
90 %
50 %
10 %
50 %
50 %
t_PLH
t_PHL
Q
50 %
50 %
V_CC
0V
V_CC
0V
V_OH
V_OL
V_OH
V_OL
V_CC
0V
V_CC
0V
V_OH
V_OL
V_OH
V_OL
Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 6 ns, t_f ≤ 6 ns
2. The output are measured one at a time with one transition per measurement.
Rev.2.00, Oct 06, 2005 page 5 of 7