MC74HC390ADG(2014) Ver la hoja de datos (PDF) - ON Semiconductor
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MC74HC390ADG Datasheet PDF : 8 Pages
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MC74HC390A
APPLICATIONS INFORMATION
Each half of the MC54/74HC390A has independent ÷ 2
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 QA is connected to the
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.
To obtain a bi−quinary count sequence, the input signals
connected to the Clock B input, and output QD is connected
to the Clock A input (Figure 6). QA provides a 50% duty
cycle output. The bi−quinary count sequence function table
is given in Table 2.
Table 1. BCD Count Sequence*
Output
Count
QD
QC
QB
QA
0
L
L
L
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
5
L
H
L
H
6
L
H
H
L
7
L
H
H
H
8
H
L
L
L
9
H
L
L
H
*QA connected to Clock B input.
Table 2. Bi−Quinary Count Sequence**
Output
Count
QA
QD
QC
QB
0
L
L
L
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
8
H
L
L
L
9
H
L
L
H
10
H
L
H
L
11
H
L
H
H
12
H
H
L
L
** QD connected to Clock A input.
CLOCK A
1, 15
÷2
COUNTER
CONNECTION DIAGRAMS
3, 13 QA
CLOCK A
1, 15
÷2
COUNTER
3, 13 QA
CLOCK B
RESET
4, 12
÷5
COUNTER
2, 14
5, 11 QB
6, 10
7, 9 QC
QD
Figure 5. BCD Count
CLOCK B 4, 12
2, 14
RESET
÷5
COUNTER
5, 11 QB
6, 10
QC
7, 9 QD
Figure 6. Bi-Quinary Count
ORDERING INFORMATION
Device
Package
Shipping†
MC74HC390ADG
SOIC−16
(Pb−Free)
48 Units / Rail
MC74HC390ADR2G
SOIC−16
(Pb−Free)
2500 / Tape & Reel
MC74HC390ADTR2G
TSSOP−16
(Pb−Free)
2500 / Tape & Reel
NLV74HC390ADR2G*
SOIC−16
(Pb−Free)
2500 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*NLV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP
Capable
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