HD74HC91 Datasheet, PDF (4/6 Pages) Hitachi Semiconductor – 8-bit Shift Register

HD74HC91
Test Circuit
VCC
Input
Pulse generator
Zout = 50 Ω
Input
Pulse generator
Zout = 50 Ω
VCC
Clock
A
B
Output
QH
Output
C_L = 50 pF
QH
C_L = 50 pF
Note: C_L includes the probe and jig capacitance.
Waveforms
• Waveform − 1
t_r
t_f
Clock
90 %
t_{w (L)}
V_CC
50 % 50 %
50 %
10 %
t_{w (H)}
10 %
0V
A or B
50 %
10 %
t_{su (H)}
90 %
t_{h (H)}
90 %
t_{su (L)}
50 %
10 %
t_{h (L)}
V_CC
50 %
0V
t_r
t_TLH
t_f
t_THL
90 %
90 %
V_OH
QH
50 %
50 %
10 %
t_PLH
t_PHL
10 %
V_OL
t_PHL
t_PLH
90 %
90 %
V_OH
QH
50 %
50 %
10 %
10 %
V_OL
t_THL
t_TLH
Note: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 6 ns, t_f ≤ 6 ns
Rev.2.00, Oct 06, 2005 page 4 of 5