84405

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84405 is a semiconductor integrated circuit, and its main function includes frequency division, frequency summation, pulse width division, pulse width summation, and the generation and output of control pulse. It is widely used in various signal processing, instrumentation, radio communication, computers and other fields.

The working principle of the 84405 is relatively simple. It uses a logic network composed of TTL logic elements to divide and combine the internal cycle and the external cycle, and controls the output pulse duration and width by a control signal. The specific process is as follows:

First, the external reference wave signal is connected to terminal E, and the external reference wave signal needs to be double or even higher than the frequency of the internal clock signal. The internal time base clock signal is connected to I, and if we change the internal timing signal, the time division ratio will also change. Terminal C is connected to the control signal, and the voltage of the control signal is inversely proportional to the pulse width of the output pulse.

The internal comparison of the internal timing signal and the external ref-wave signal is done by a logic network, so the output of logic is a logic high signal, and the width of the output pulse is related to the voltage of the control signal. The signal frequency division, summation, pulse width division, and pulse width summation are completed by this logic, so the 84405 is widely used in various signal processing, instrumentation, radio communication, computers and other fields.

For example, in radio communication, the 84405 can realize a repeater mode control to control the automatically switch between receiving and sending by a long-distance signal, thereby improving the transmission quality. In addition, the 84405 can be used to generate and output a series of control signals with different pulse widths in a certain range, which can control the data display of LCD display by adjusting the duty cycle.

In conclusion, the 84405 is a very useful semiconductor integrated circuit, and its application fields are diverse, and the working principle is also relatively simple. Therefore, it is widely used in various signal processing, instrumentation, radio communication, computers and other fields.

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