HD74LS221 Datasheet, PDF (7/9 Pages) Hitachi Semiconductor – Dual Monostable Multivibrators

HD74LS221
Waveforms 5
Clear overriding B, then trigger from B.
t_TLH
t_THL
3V
B Input
90% 90%
1.3V 1.3V
1.3V
10%
10%
0V
≥ 50ns
t_su
≥ 0ns
3V
CLR
1.3V
1.3V
0V
Triggered
Q
Not Triggered
1.3V 1.3V
t_{w (out)}
V_OH
V_OL
Note: Input pulse: t_TLH ≤ 15 ns, t_THL ≤ 6 ns, PRR = 1 MHz
Waveforms 6
Positive transition of Clear.
t_TLH
t_THL
3V
B Input
90%
10% ^1.3V
90%
1.3V _10%
0V
≥ 50ns
≥ 50ns
3V
CLR
1.3V
1.3V
0V
V_OH
Q
V_OL
Note: Input pulse: t_TLH ≤ 15 ns, t_THL ≤ 6 ns, PRR = 1 MHz
Rev.3.00, Jul.15.2005, page 7 of 8