Datasheet

2
Functional Diagram
4 (12)
5 (11)
7 (9)
nQ
3
nQ
1
nCP1
÷ 5
nCP0
2 (14)
1 (15)
3 (13)
nQ
0
nMR
÷ 2
COUNTER
COUNTER
6 (10)
nQ
2
GND = 8
V
CC
= 16
TRUTH TABLE
INPUTS
ACTIONCP MR
↑ L No Change
↓ L Count
X H All Qs Low
H = High Voltage Level, L = Low Voltage Level, X = Don’t Care,
↑ = Transition from Low to High Level, ↓ = Transition from High to Low.
BCD COUNT SEQUENCE FOR 1/2 THE 390
COUNT
OUTPUTS
Q0 Q1 Q2 Q3
0LLLL
1HLLL
2LHLL
3HHLL
4LLHL
5HLHL
6LHHL
7HHHL
8LLLH
9HLLH
Output nQ0 connected to nCP1 with counter input on nCP0.
B-QUINARY COUNT SEQUENCE FOR 1/2 THE 390
COUNT
OUTPUTS
Q0 Q1 Q2 Q3
0LLLL
1LHLL
2LLHL
3LHHL
4LLLH
5HLLL
6HHHL
7HLHL
8HHHL
9HLLH
Output nQ3 connected to nCP0 with counter input on nCP1.
CD74HC390, CD54HCT390, CD74HCT390