SN74AS869NT

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A SN74AS869NT is an 8-bit binary ripple counter that is part of the widely-used SN74ASYxxN series from Texas Instruments. This series is widely used as ripple counters, dividers and as frequency dividers in most circuits. The SN74AS869NT is a high-speed, CMOS synchronous binary ripple counters that includes five master-slave flip-flops and an additional output, QH\' to provide a divide-by-two capability. It is a fully static device that requires no external clocks or timing signals and employs an advanced CMOS technology incorporating an enhanced direct slave reset function.

The SN74AS869NT is designed so that the counting sequence begins with the Q0 output (pin 5) going high, while all other outputs remain low. The outputs change states sequentially on every positive-going transition of the clock input (pin 6). Therefore, the SN74AS869NT is ideal for applications that require dividing of a frequency or for binary counting.

The SN74AS869NT’s reset input (pin 10) is brought low to reset the counter and hold Q0 (pin 5) output high. This can be used to synchronize the lower half of the counter to the upper half of the counter and serves to reset the counter for the next count. The QH\' output (pin 8) provides a divide-by-two capability and goes high each time the binary output (Q0-Q7) goes from 11111111 to 00000000. The QH\' output can be used to drive a high-toggling single-bit register such as a SN74AS139N to provide further divide-by-two capability.

The SN74AS869NT is constructed with a circuit design optimized for the highest performance, industry-standard families and application marks. The active power consumption of the SN74AS869NT is extremely low with no external components needed to run the circuit. Furthermore, the SN74AS869NT is designed to operate over a wide range of supply voltages (3.3V to 7V) thanks to the optimized CMOS process.

Because of its wide range of features and low power consumption, the SN74AS869NT is an essential component in a variety of digital systems. The SN74AS869NT is commonly used for frequency division, rate-multiplication, and syndrome code generation. It is also ideal for noise reduction, rate-matching, frequency-division, and digital data processing. The clock input can be fully synchronous, asynchronous, or both, depending on the application needs. The maximized performance and the low-power consumption of SN74AS869NT makes it the perfect choice for most digital systems.

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