Oct 30, 2014 · In our circuit, we are grounding R 0(2) (pin 3) and R 9(1) (pin 6) of 7490 (condition 4). We can design two types of counters using 7490. We can design two types of counters using 7490. They are BCD counter and Bi-quinary counter ( Refer Function Tables of 7490 given in page 3 of datasheet ). 74147n中文资料和供应商货源价格,ic资料网为你提供74147n中文资料,参数,设计实例,数据表,集成电路74147n的引脚功能和元器件使用说明规格书

The 7490 integrated circuit counts the number of pulses arriving at its input. The number of pulses counted (up to 9) appears in binary form on four pins of the ic. When the tenth pulse arrives at the input, the binary output is reset to zero (0000) and a single pulse appears at another output pin.