HD74LS221 Datasheet, PDF (6/9 Pages) Hitachi Semiconductor – Dual Monostable Multivibrators

HD74LS221
Waveforms 3
Trigger from B, then clear (A input is low).
t_TLH
B Input
10%
90%
1.3V
≥ 60ns
CLR
t_THL
90%
10%
1.3V
Q
Note: Input pulse: t_TLH ≤ 15 ns, t_THL ≤ 6 ns, PRR = 1 MHz
Waveforms 4
Trigger from A (B and clear input are high).
t_THL
A ^90%
10%
10%
t_TLH
90%
Q
1.3V
tw (out)
tw (out)
Q
1.3V
Note: Input pulse: t_TLH ≤ 15 ns, t_THL ≤ 6 ns, PRR = 1 MHz
1.3V
1.3V
3V
0V
3V
0V
V_OH
V_OL
3V
0V
3V
0V
V_OH
V_OL
Rev.3.00, Jul.15.2005, page 6 of 8