74HC/HCT4510 데이터 시트보기 (PDF) - Philips Electronics
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74HC/HCT4510 Datasheet PDF : 12 Pages
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Philips Semiconductors
BCD up/down counter
Product specification
74HC/HCT4510
Count-up mode: illegal states in
BCD counters corrected in one count.
Count-down mode: illegal states in
BCD counters corrected in one or
two counts.
Count-up mode.
Fig.14 State diagram.
Count-down mode.
Use the following formulae to calculate Ntotal:
i
π
Ntotal =
( 10
×
Ni)
+
N0
1
fout = N-----ft--oi-n-t--a--l
Formulae are only applicable if legal data is
provided to the parallel inputs.
Fig.15 Programmable cascaded frequency divider.
parallel inputs
D3
D2
D1 D0
0
0
00
0
0
01
0
0
10
0
0
11
0
1
00
0
1
01
0
1
10
0
1
11
1
0
00
1
0
01
Note
1. no count; fout is HIGH.
count-up
n
9
8
7
6
5
4
3
2
1
(1)
count-down
n
(1)
1
2
3
4
5
6
7
8
9
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.
December 1990
12
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