A decade counter is a type of digital counter that is designed to count from 0 to 9, or 0000 to 1001 in binary). It is typically made up of a series of flip-flops that store the current count, and the counter increments or decrements the count in response to a clock signal. Decade counters are used in a variety of applications where a large number of counts are needed, but space or power constraints prevent the use of a larger counter. Some common applications for these counters include frequency division, pulse generation, and digital display systems. A decade counter can count up or down, depending on the design. Decade counters are available in a variety of different packages, including through-hole, surface mount, and custom packages. They can be implemented easily using D- or JK-type flip-flops). A BCD counter is a special type of digital counter that counts in binary-coded decimal, and can count from 0 to 9.