CD54HC4059_08 Datasheet, PDF (1/14 Pages) Texas Instruments – High-Speed CMOS Logic CMOS Programmable Divide-by-N Counter

CD54HC4059, CD74HC4059
Data sheet acquired from Harris Semiconductor
SCHS206B
February 1998 - Revised May 2003
High-Speed CMOS Logic
CMOS Programmable Divide-by-N Counter
[ /Title
(CD74
HC4059
)
/Sub-
ject
(High-
Speed
CMOS
Logic
CMOS
Pro-
Features
Description
• 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^oC to 125^oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC
at V_CC = 5V
The ’HC4059 are high-speed silicon-gate devices that are
pin-compatible with the CD4059A devices of the CD4000B
series. These devices are divide-by-N down-counters 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_a, K_b and K_c determine the
modulus (“divide-by” number) of the first and last counting
sections in accordance with the truth table. 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_a is
set “high”, K_b “high” and K_c “low”. Jam inputs J1, J2, J3, 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.
Applications
• Communications Digital Frequency Synthesizers;
VHF, UHF, FM, AM, etc.
• Fixed or Programmable Frequency Division
• “Time Out” Timer for Consumer-Application Industrial
Controls
Ordering Information
PART NUMBER
TEMP. RANGE
(^oC)
PACKAGE
CD54HC4059F3A
-55 to 125
24 Ld CERDIP
CD74HC4059E
-55 to 125
24 Ld PDIP
CD74HC4059M96
-55 to 125
24 Ld SOIC
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel.
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 modes is shown in the
Extended Counter Range column. Control inputs K_b and K_c
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_b and K_c both remain low. The
counter begins to count down from the preset state when a
counting mode other than the master preset mode is selected.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2003, Texas Instruments Incorporated
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