74LS90 Decade Counter IC Descriptionħ4LS90 decade counter IC description and pin configuration is shown below. It is an 8421 code (binary weight of 4 digits or bits), which consists of 4 binary digits and very easy to perform binary and decimal conversions. Hence, it is called a binary coded decimal counter (BCD Counter). Similarly, the BCD counter is a Mod-10 counter, which resets to zero after counting from 0(0000) to 9 (1001), represents the result in decimal form. The counting range of the n-bit modulus binary counter is from 0 to 2n-1. Examples are mod-8 counter, mod-16 counter, etc. When a counter counts n- counts, it reaches zero, called modulus n-counter. The term Modulus is the total no of counts that a counter has a capacity of counting pulses.
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January 2023
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