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CD74HC4059 Datasheet(PDF) 2 Page - Texas Instruments

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No. de pieza CD74HC4059
Descripción Electrónicos  High-Speed CMOS Logic CMOS Programmable Divide-by-N Counter
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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CD74HC4059 Datasheet(HTML) 2 Page - Texas Instruments

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2
The counter should always be put in the master preset mode
before the
÷5 mode is selected. Whenever the master preset
mode is used, control signals Kb = “low” and Kc = “low” must
be applied for at least 3 full clock pulses.
After Preset Mode inputs have been changed to one of the
÷
modes, the next positive-going clock transition changes an
internal flip-flop so that the countdown can begin at the
second positive-going clock transition. Thus, after an MP
(Master Preset) mode, there is always one extra count
before the output goes high. Figure 1 illustrates a total count
of 3 (
÷8 mode). If the Master Preset mode is started two
clock cycles or less before an output pules, the output pulse
will appear at the time due. If the Master Preset Mode is not
used, the counter jumps back to the “Jam” count when the
output pulse appears.
A “high” on the Latch Enable input will cause the counter
output to remain high once an output pulse occurs, and to
remain in the high state until the latch input returns to “low”.
If the Latch Enable is “low”, the output pulse will remain high
for only one cycle of the clock-input signal.
Pinout
CD74HC4059
(PDIP)
TOP VIEW
Functional Diagram
1
2
3
4
5
6
7
8
9
10
11
12
CP
LE
J1
J2
J3
J4
J16
J15
J14
J13
Kc
GND
16
17
18
19
20
21
22
23
24
15
14
13
VCC
J5
J6
J7
J8
J10
J12
Ka
Kb
Q
J9
J11
Q =
Kc
LE
Kb
Ka
CP
J1 - J16
f
IN
N
-------


TRUTH TABLE
MODE SELECT INPUT
FIRST COUNTING SECTION
LAST COUNTING SECTION
COUNTER RANGE
DESIGN
EXTENDED
Ka
Kb
Kc
MODE
DIVIDES-BY
CAN BE
PRESET
TO A MAX
OF:
(NOTE 3)
JAM
INPUTS
USED:
MODE
DIVIDES-BY
CAN BE
PRESET
TO A MAX
OF:
(NOTE 3)
JAM
INPUTS
USED:
MAX
MAX
H
H
H
2
1
J1
8
7
J2, J3, J4
15,999
17,331
L
H
H
4
3
J1, J2
4
3
J3, J4
15,999
18,663
HLH
5
(Note 4)
4
J1, J2, J3
2
1
J4
9,999
13,329
L
L
H
8
7
J1, J2, J3
2
1
J4
15,999
21,327
H
H
L
10
9
J1, J2, J3, J4
1
0
-
9,999
16,659
X
L
L
Master Preset
Master Preset
-
-
NOTES:
2. X = Don’t Care
3. J1 = Least Significant Bit. J4 = Most Significant Bit.
4. Operation in the
÷5 mode (1st counting section) requires going through the Master Preset mode prior to going into the ÷5 mode. At power
turn-on, Kc must be “low” for a period of 3 input clock pulses after VCC reaches a minimum of 3V.
CD74HC4059
CD74HC4059


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