74LS162 and 74ls00 themselves are decimal. There are two ways to implement base 7: clear zero and set the number.
Zero clearing method: the output end Q0, Q1, Q2 (Q3 is high) through an and not gate to the zero clearing end, set the number end to a high level (data input end without tube).
Data setting method: the data input end D0, D1, D2, D3 (D3 is high) is connected to 0011, the clear end is connected to the high level, the output end CO is connected to a non-gate, and then connected to the data setting end, at this time the output is 7. Counting is one of the most simple and basic operations, the counter is the logic circuit to achieve this operation, the counter in the digital system is mainly to count the number of pulses, in order to achieve the function of measurement, counting and control, while both frequency division function, the counter is composed of basic counting units and some control doors. The counting unit consists of a series of flip-flops with the function of storing information, such as RS flip-flops, T flip-flops, D flip-flops and JK flip-flops.
74LS162 is a four-digit binary counter that cannot be changed directly to a quinary counter. If you need to build a quinary counter, you can use a suitable counter chip such as 74LS163 or 74LS169, and carry out the corresponding circuit design. Quinary is a very sparsely used decimal system that may require more hardware resources and design effort.