HD74HC190 Hitachi Semiconductor, HD74HC190 Datasheet - Page 3

• Manufacturer Part Number: HD74HC190
• Description: Synchronous Up/Down Decade/4-bit Binary Counter(Single Clock Line)
• Manufacturer: Hitachi Semiconductor

Timing Chart
HD74HC190
Illustrated below is the following sequence:
1. Load (preset) to BCD seven.
2. Count up to eight, nine (maximum), zero, one and two.
3. Inhibit
4. Count down to one, zero (minimum), nine, eight and seven.
Enable G
Down/Up
Max/Min
Ripple
Clock
Clock
Load
Q
Q
Q
Q
C
D
A
B
C
D
A
B
Load
7
8
9
Count Up
0
1 2
Inhibit
2 2 1
HD74HC190/HD74HC191
0
Count Down
9
8
7
3