HD74LS191 Datasheet, PDF (9/11 Pages) Hitachi Semiconductor – Synchronous Up/Down 4-bit Binary Counters(single clock line)

HD74LS191
Waveforms 4
Clock→Q
Load
Data
(A to D)
Down/Up
Clock
Q
Enable = 0V
Waveforms 5
Clock→Max / Min
Load
A
Inputs
B, C, D
Down/Up
Clock
Max/Min
Enable = 0V
1.3V
1.3V
t_PLH
3V
0V
3V
0V
3V
0V
3V
1.3V
0V
1.3V
t_PHL
V_OH
V_OL
3V
0V
3V
0V
3V
0V
3V
0V
1.3V
1.3V
3V
1.3V
1.3V
0V
1.3V
1.3V
1.3V
1.3V
t_PLH
t_PHL
t_PLH
t_PHL
V_OH
V_OL
Rev.2.00, Feb.18.2005, page 9 of 10