Texas Instruments CD74HC4059M96, CD74HC4059E, CD54HC4059F3A Datasheet

Data sheet acquired from Harris Semiconductor
SCHS206

February 1998

CD74HC4059

High-Speed CMOS Logic

CMOS Programmable Divide-by-N Counter

[ /Title
(CD74
HC4059
)
/Sub­ject
(High­Speed
CMOS
Logic
CMOS
Pro-

Features

• Synchronous Programmable ÷N Counter N = 3 to 9999

or 15999

• Presettable Down-Counter

• Fully Static Operation

• Mode-Select Control of Initial Decade Counting

Function (÷10, 8, 5, 4, 2)

• Master Preset Initialization

• Latchable ÷N Output

• Fanout (Over Temperature Range)

- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55

• Balanced Propagation Delay and Transition Times

• Significant Power Reduction Compared to LSTTL
Logic ICs

• HC Types

- 2V to 6V Operation

- High Noise Immunity: N

at VCC = 5V

= 30%, NIH = 30% of V

IL

o

C to 125oC

CC

Description

The Harris CD74HC4059 are high-speed silicon-gate
devices that are pin-compatible with the CD4059A devices of
the CD4000B series. These devices are divide-by-N down­counters that can be programmed to divide an input
frequency by any number “N” from 3 to 15,999. The output
signal is a pulse one clock cycle wide occurring at a rate
equal to the input frequency divide by N. The down-counter
is preset by means of 16 jam inputs.

The three Mode-Select Inputs K
modulus (“divide-by” number) of the first and last counting
sections in accordance with the truth table shown on Tab le 1.
Every time the first (fastest) counting section goes through one
cycle, it reduces by 1 the number that has been preset
(jammed) into the three decades of the intermediate counting
section an the last counting section, which consists of flip-flops
that are not needed for opening the first counting section. For
example, in the ÷2 mode, only one flip-flop is needed in the first
counting section. Therefore the last counting section has three
flip-flops that can be preset to a maximum count of seven with a
place value of thousands. If ÷10 is desired for the first section,
K

is set “high”, Kb“high” and Kc“low”. Jam inputs J1, J2, J3,

a

and J4 are used to preset the first counting section and there is
no last counting section. The intermediate counting section
consists of three cascaded BCD decade (÷10) counters
presettable by means of Jam Inputs J5 through J16.

and Kcdetermine the

a,Kb

Applications

• Communications Digital Frequency Synthesizers;
VHF, UHF, FM, AM, etc.

• Fixed or Programmable Frequency Division

• “Time Out” Timer for Consumer-Application Industrial
Controls

• AN6374 “Application of the CMOS CD4059A Program­mable Divide-by-N Counter in FM and Citizens Band
Transceiver Digital Tuners”

Ordering Information

TEMP. RANGE

PART NUMBER

CD74HC4059E -55 to 125 24 Ld PDIP E24.3

NOTE:

1. Wafer and die is available which meets all electrical
specifications. Please contact your local sales office or Harris
customer service for ordering information.

(oC) PACKAGE

PKG.

NO.

The Mode-Select Inputs permit frequency-synthesizer
channel separations of 10, 12.5, 20, 25 or 50 parts. These
inputs set the maximum value of N at 9999 (when the first
counting section divides by 5 or 10) or 15,999 (when the first
counting section divides by 8, 4, or 2).

The three decades of the intermediate counter can be preset
to a binary 15 instead of a binary 9, while their place values
are still 1, 10, and 100, multiplied by the number of the ÷N
mode. For example, in the ÷8 mode, the number from which
counting down begins can be preset to:

3rd Decade 1500
2nd Decade 150
1st Decade 15
Last Counting Section 1000

The total of these numbers (2665) times 8 equals 12,320.
The first counting section can be preset to 7. Therefore,
21,327 is the maximum possible count in the ÷8 mode.

The highest count of the various is shown in the column entitled
Extended Counter Range of Table 1. Control inputs K
can be used to initiate and lock the counter in the “master
preset” state. In this condition the flip-flops in the counter are
preset in accordance with the jam inputs and the counter
remains in that state as long as K
counter begins to count down from the preset state when a
counting mode other than the master preset mode is selected.

and Kcboth remain low.The

b

and K

b

c

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright

© Harris Corporation 1998

1

File Number 1853.2

CD74HC4059CD74HC4059

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 K

= “low” and Kc= “low” must

b

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

TOP VIEW

CP

1
2

LE

J1

3

J2

4

J3

5
6

J4

J16

7
8

J15
J14

9

10

J13

K

11

c

12

GND

Functional Diagram

J1 - J16

(PDIP)

24

V

CC

23

Q

22

J5

21

J6

20

J7

19

J8
J9

18
17

J10

16

J11

15

J12

14

K

a

13

K

b

CP

K
K
K

LE

a

b

c

Q =

f

IN



-------



N

TRUTH TABLE

COUNTER RANGE

MODE SELECT INPUT FIRST COUNTING SECTION LAST COUNTING SECTION

CAN BE

PRESET

MODE

K

K

a

K

b

DIVIDES-BY

c

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

DESIGN EXTENDED

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

4 J1, J2, J3 2 1 J4 9,999 13,329

(Note 4)
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 (1stcounting section) requires going through theMaster 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.

2

CD74HC4059CD74HC4059

How to Preset the CD74HC/HCT4059 to Desired ÷N

The value N is determined as follows:

(EQ. 1)

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)

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.

Program Jam Inputs (BCD)

Example:
N = 8479, Mode = 5

Mode N

Preset Value =

N

Mode

1695 + 4 (Preset Values)

| 8479

5

(EQ. 2)

Mode Select = 5

K

aKbKc

HLH

41

J1 J2 J3 J4
L LH H

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

J13J24J35J4

12

GND

24

V

CC

CLOCK

INPUT

1

FIRST

COUNTING

SECTION

÷10, 8, 5, 4, 2

J5 J6 J7 J8
H LHL

6

5

9

J9 J10 J11 J12

HLLH

PROGRAM JAM INPUTS (BCD)

J522J621J720J8

PRESETTABLE LOGIC

INTERMEDIATE COUNTING SECTION

÷10 ÷10 ÷10

J918J1017J1116J1215J1310J149J158J16

19

6

J13 J14 J15 J16

LHHL

7

P.E.

LAST

COUNTING

SECTION

÷1, 2, 2, 4, 8

MODE

SELECT

INPUTS

RECOGNITION

GATING

14

K

a

13

K

b

11

K

c

MODE

CONTROL

LATCH

ENABLE

PRESET
ENABLE

2

OUTPUT

STAGE

23

DIVIDE-BY-N
OUTPUT

FIGURE 1. FUNCTIONAL BLOCK DIAGRAM

3