HD74LS192 Datasheet, PDF (8/11 Pages) Hitachi Semiconductor – Synchronous Up/Down Decade Counters(dual clock lines)

HD74LS192
Waveforms 2
ƒ_max, t_PLH, t_PHL, (Count Down)
t_TLH
t_THL
t_{w (H)}
t_{w (L)}
Count
Down
90% 90%
10% 10%
1.3V
1.3V
1.3V
(Measure at tn + 1) t_PHL
1.3V
1.3V
t_PLH (Measure
at tn + 0)
Q_A
Q_B
Outputs
Q_C
1.3V
t_PHL (Measure at tn + 4)
1.3V
1.3V
t_PHL (Measure at tn + 6)
1.3V
t_PHL (Measure at tn + 2)
1.3V
t_{PLH (Measure}
at tn + 2)
1.3V
t_{PLH (Measure}
at tn + 2)
1.3V
t_{PLH (Measure}
at tn + 0)
Q_D
1.3V
1.3V
(Measure before 1 clock of tn + 0) ^tPHL
t_{PLH (Measure}
at tn + 0)
Borrow
1.3V
1.3V
Notes: 1. for ƒ_max t_TLH , t_THL ≤ 2.5 ns.
2. t_n is reference bit time when all outputs are high.
3V
0V
V_OH
V_OL
V_OH
V_OL
V_OH
V_OL
V_OH
V_OL
V_OH
V_OL
Rev.2.00, Feb.18.2005, page 8 of 10