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|コンポーネント説明||SYNCHRONOUS 4-BIT DECADE COUNTER|
This synchronous, presettable 4-bit decade counter features an internal carry look-ahead circuitry for application in high-speed counting designs. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous (ripple clock) counters; however, counting spikes may occur on the ripple carry out output (RCO). A buffered clock input triggers the four flip-flops on the rising (positive-going) edge of the clock input waveform.
This counter is fully programmable in that they may be preset to any number between 0 and 9. As presetting is synchronous, setting up a low level at the load input disables the counter and causes the outputs to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs. The clear function for the 74AC11160 is synchronous and a low level at the clear input sets all four of the flip-flops outputs low, regardless of the levels of the clock, load, or enable inputs.
If one of these decade counters is preset to a number between 10 and 15 or assumes such an invalid state when power is applied, it will progress to the normal sequence within two counts as shown in the state diagram.
• Internal Look-Ahead for Fast Counting
• Carry Output for n-Bit Cascading
• Fully Synchronous Operation for Counting
• Flow-Through Architecture to Optimize PCB
• Center-Pin VCC and GND Pin Configurations
Minimize High-Speed Switching Noise
• EPIC ™ (Enhanced-Performance Implanted
CMOS) 1-µm Process
• 500-mA Typical Latch-Up Immunity at 125°C
• Package Options Include Plastic
Small-Outline Packages and Standard
Plastic 300-mil DIPs
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