4026 decade counter and 7-segment display driver

The count advances as the clock input becomes high (on the rising-edge). The outputs a-g go high to light the appropriate segments of a common-cathode 7-segment display as the count advances. The maximum output current is about 1mA with a 4.5V supply and 4mA with a 9V supply. This is sufficient to directly drive many 7-segment LED displays. The table below shows the segment sequence in detail.

The reset input should be low (0V) for normal operation (counting 0-9). When high it resets the count to zero.

The disable clock input should be low (0V) for normal operation. When high it disables counting so that clock pulses are ignored and the count is kept constant.

The enable display input should be high (+Vs) for normal operation. When low it makes outputs a-g low, giving a blank display. The enable out follows this input but with a brief delay.

The ÷10 output (h in table) is high for counts 0-4 and low for 5-9, so it provides an output at ¹/₁₀ of the clock frequency. It can be used to drive the clock input of another 4026 to provide multi-digit counting.

The not 2 output is high unless the count is 2 when it goes low.