Datasheet

3
How to Preset the HC/HCT4059 to Desired ÷N
The value N is determined as follows:
To calculate preset values for any N count, divide the N
count by the Mode. The resultant is the corresponding
preset values of the 5th through 2nd decade with the
remainder being equal to the 1st decade value.
NOTE: To verify the results, use Equation 1:
N = 5 (1000 x 1 + 100 x 6 + 10 x 9 + 1 x 5) + 4
N = 8479
N = (MODE†) (1000 x Decade 5 Preset + 100 x Decade 4
Preset + 10 x Decade 3 Preset + 1 x Decade 2 Preset) +
Decade 1 Preset
† MODE = First counting section divider (10, 8, 5, 4 or 2)
(EQ. 1)
Preset Value =
N
Mode
Example:
N = 8479, Mode = 5
1695 + 4 (Preset Values)
5
| 8479
Mode N
Mode Select = 5
K
a
K
b
K
c
HLH
(EQ. 2)
Program Jam Inputs (BCD)
J1 J2 J3 J4
L LH H
41
J5 J6 J7 J8
H LHL
5
J9 J10 J11 J12
HLLH
9
J13 J14 J15 J16
LHHL
6
FIGURE 1. FUNCTIONAL BLOCK DIAGRAM
FIRST
COUNTING
SECTION
÷10, 8, 5, 4, 2
LAST
COUNTING
SECTION
÷1, 2, 2, 4, 8
÷10 ÷10 ÷10
RECOGNITION
GATING
PRESET
ENABLE
INTERMEDIATE COUNTING SECTION
OUTPUT
STAGE
MODE
CONTROL
PRESETTABLE LOGIC
GND
V
CC
12
24
CLOCK
1
INPUT
MODE
14
13
11
K
a
K
b
K
c
SELECT
INPUTS
LATCH
2
ENABLE
DIVIDE-BY-N
23
OUTPUT
P.E.
J1
3
J2
4
J3
5
J4
6
J5
22
J6
21
J7
20
J8
19
J9
18
J10
17
J11
16
J12
15
J13
10
J14
9
J15
8
J16
7
PROGRAM JAM INPUTS (BCD)
CD54HC4059, CD74HC4059CD54HC4059, CD74HC4059