hd74hc191rpel Renesas Electronics Corporation., hd74hc191rpel Datasheet - Page 3

• Manufacturer Part Number: hd74hc191rpel
• Description: Synchronous Up/down Decade Counter
• Manufacturer: Renesas Electronics Corporation.

HD74HC190, HD74HC191
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.
Rev.3.00, Jan 31, 2006 page 3 of 12
Enable G
Down/Up
Max/Min
Ripple
Clock
Clock
Load
Q
Q
Q
Q
C
D
A
B
A
B
C
D
Load
7
8
9
Count Up
0
1 2
Inhibit
2 2 1
0
Count Down
9
8
7