MC74HC390ADTR2 ON Semiconductor, MC74HC390ADTR2 Datasheet - Page 7

• Manufacturer Part Number: MC74HC390ADTR2
• Description: IC COUNTER RPPL DUAL 4ST 16TSSOP
• Manufacturer: ON Semiconductor
• Series: 74HCr

Specifications of MC74HC390ADTR2

• Logic Type: Divide-by-N
• Number Of Elements: 2
• Number Of Bits Per Element: 4
• Reset: Asynchronous
• Count Rate: 50MHz
• Trigger Type: Negative Edge
• Voltage - Supply: 2 V ~ 6 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Direction: -
• Timing: -

and ÷ 5 sections (except for the Reset function). The ÷ 2 and
÷ 5 counters can be connected to give BCD or bi−quinary
(2−5) count sequences. If Output Q
Clock B input (Figure 4), a decade divider with BCD output
is obtained. The function table for the BCD count sequence
is given in Table 1.
Each half of the MC54/74HC390A has independent ÷ 2
*Q
CLOCK A
CLOCK B
A
Count
RESET
connected to Clock B input.
0
1
2
3
4
5
6
7
8
9
Table 1. BCD Count Sequence*
Figure 6. BCD Count
Q
H
H
L
L
L
L
L
L
L
L
1, 15
4, 12
2, 14
D
Q
COUNTER
COUNTER
H
H
H
H
L
L
L
L
L
L
C
Output
÷ 2
÷ 5
A
Q
is connected to the
H
H
H
H
L
L
L
L
L
L
B
APPLICATIONS INFORMATION
3, 13
6, 10
5, 11
7, 9
CONNECTION DIAGRAMS
Q
H
H
H
H
H
L
L
L
L
L
A
Q
Q
Q
Q
A
B
C
D
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7
connected to the Clock B input, and output Q
to the Clock A input (Figure 7). Q
cycle output. The bi−quinary count sequence function table
is given in Table 2.
To obtain a bi−quinary count sequence, the input signals
** Q
Table 2. Bi−Quinary Count Sequence**
Count
CLOCK A
CLOCK B
D
RESET
10
11
12
connected to Clock A input.
0
1
2
3
4
8
9
4, 12
2, 14
Figure 7. Bi-Quinary Count
Q
H
H
H
H
H
L
L
L
L
L
A
1, 15
Q
COUNTER
COUNTER
H
H
L
L
L
L
L
L
L
L
D
Output
÷ 2
÷ 5
A
provides a 50% duty
Q
H
H
H
H
L
L
L
L
L
L
C
D
3, 13
6, 10
5, 11
7, 9
is connected
Q
H
H
H
H
L
L
L
L
L
L
B
Q
Q
Q
Q
A
B
C
D