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Flip-Flop Using CMOS NAND Gates(BC547)

2017-08-03 18:59  
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This article briefly describes the Flip-Flop Using CMOS NAND Gates (BC547). This principle is easy to understand, but also very practical. Depth understanding of circuit elements, you can better grasp this principle. In this circuit, you can learn about and purchase these components: BC547.

Using just twoNANDor inverter gates its possible to build a D type (or ‘toggle’) ?ip-?op with a push-button input. At power-up the output of gate N2 is at a logical ‘1’, ensuring that transistor T2 is switched off. When the push-button is pressed the output of N2 changes to a logical ‘0’ and transistor T2 conducts. The coupling between N1 and N2 ensures that the output of N1 will always be the inverse of N2 so T1 and T2 will always be in opposite states and will flip each time the push-button is pressed. In some cases it is possible to omit T1 and T2 and use the outputs of N2 and N1 to drive external circuitry directly but only if the loading on these outputs is low enough.


Figure 1 

The 4000 seriesCMOSfamily can source/sink a maximum of 0.5mA (at 5 V) so for the sake of safety its best to use these open-collector con?gured transistor buffers. This circuit is particularly useful if you have some unused gates left over in a circuit design, avoiding the need to add a dedicated flip-flop IC. It is worth remembering that all other unusedCMOSgates must have their inputs connected to either the positive or ground rail. The supply voltage can be in the range 3 V to 15 V forCMOSICs and the current taken by this circuit is between 0.2 mA and 5 mA (no load).


Figure 2 



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