CD74AC163M

The CD74AC163M is a synchronous 4-bit binary counter that offers the high performance of the AC family with low power consumption. It is a high-speed CMOS synchronous 4-bit binary ripple counter containing 4 individual D-type flip-flops. The device is triggered by a rising-edge on the clock input, which is directly connected to each flip-flop\'s clock. The active-low clear (CLR) input asynchronously resets all counters to the low state. The outputs are direct logic indications of the four flip-flop outputs.

• The CD74AC163M can be used in counter, periods and rate control, multiplexers, timer/delay, and shift register applications.
• It can be used as a counter in digital clocks and calculators.
• It is useful in frequency dividers.
• It can be used in medical or industrial instrumentation.

The working of the CD74AC163M can be described by considering the following four flip-flops. Clock pulses are applied to all four flip-flops simultaneously and even though they reach each of the four flip-flops with a certain delay, they actually get clocked simultaneously. The active-low clear (CLR) is used to reset the counter to its initial unmanipulated state.

When the clock pulses are connected to the first flip-flop it activates the logic level “0” on the Q output of the flip-flop. This is followed by a re-triggering of the clock and then the logic level will shift to “1”. When the output is ‘1’ again, the second flip-flop’s clock pulse gets triggered, this time the output is ‘0’. This whole process repeats itself and thus the state of the counter at any instance is known by the state of 4 flip-flop outputs.

As the counter increases and their output count, the third counter’s clock pulse is triggered and this time the output is ‘1’ and the fourth counter gets triggered and the output is ‘0’. The four flip-flop outputs represent the count in the form of logic level which can be used for other operations by other circuits.