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 . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5VApplication• Communications Digital Frequency Synthesizers;VHF, UHF, FM, AM, etc.
• Fixed or Programmable Frequency Division
• "Time Out" Timer for Consumer-Application Industrial ControlsPinout
SpecificationsDC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
DC Input Diode Current, IIK
For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Diode Current, IOK
For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±20mA
DC Output Source or Sink Current per Output Pin, IO
For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±25mA
DC VCC or Ground Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . .±50mADescriptionThe 'HC4059 are high-speed silicon-gate devices that are pin-compatible with the CD4059A devices of the CD4000B series. CD54HC4059 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 Ka, Kb and Kc 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, CD54HC4059 reduces by 1 the number that has been preset (jammed) into the three decades of the intermediate counting section an the last counting section, CD54HC4059 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, Ka is set "high", Kb "high" and Kc "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.
The Mode-Select Inputs permit frequency-synthesizer channel separations of 10, 12.5, 20, 25 or 50 parts. These CD54HC4059 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 Kb and Kc 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 CD54HC4059 counter remains in that state as long as Kb and Kc both remain low. The CD54HC4059 counter begins to count down from the preset state when a counting mode other than the master preset mode is selected.
CD54HC4059 Data Sheet
