HD74LS221 Datasheet, PDF (5/9 Pages) Hitachi Semiconductor – Dual Monostable Multivibrators

HD74LS221
Waveforms 1
Trigger from B, then clear (A input is low).
t_TLH
t_{w (in)}
t_THL
B Input
90%
10% ^1.3V
90%
1.3V _10%
≥ 60ns
CLR
1.3V
t_PLH
t_PHL
Q
1.3V
t_PHL
t_PLH
Q
1.3V
Note: Input pulse: t_TLH ≤ 15 ns, t_THL ≤ 6 ns, PRR = 1 MHz
1.3V
1.3V
Waveforms 2
Trigger from A, then clear (B input is high).
t_THL
t_{w (in)}
t_TLH
A
90%
1.3V
10%
90%
1.3V
10%
≥ 60ns
CLR
1.3V
t_PLH
t_PHL
Q
1.3V
1.3V
t_PLH
Q
1.3V
t_PHL
Note: Input pulse: t_TLH ≤ 15 ns, t_THL ≤ 6 ns, PRR = 1 MHz
1.3V
3V
0V
3V
0V
3V
0V
V_OH
V_OL
3V
0V
3V
0V
V_OH
V_OL
V_OH
V_OL
Rev.3.00, Jul.15.2005, page 5 of 8