CD4528BCN

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CD4528BCN is a high-performance monolithic dual CMOS timer. It is composed of two complementary-symmetry oscillators. This device is primarily used as a dual one-shot/multivibrator with independently adjustable width and symmetry. The circuits are triggered by two independent external inputs, and output pulse widths and symmetry of one-shots are adjustable by two timing resistors. It can also be used as an oscillator with manual reset.

CD4528BCN application field and working principle:

CD4528BCN is widely used in various electronic devices. Its applications include timing, pulse-width modulation, frequency divider, counting and so on. In addition, it can be used as latch, level detector, pulse generator and pulse amplifying circuit.

The operating principle of CD4528BCN is based on the switching action of two inverting amplifier circuits connected in parallel. Its flip-flop can be realized by setting different resistors. A simplified diagram of the internal structure of CD4528BCN is illustrated in Figure 1.

Figure 1. Simplified internal diagram of CD4528BCN

As shown in Figure 1, CD4528BCN consists of two identical CMOS inverting amplifier circuits (A1, B1 and A2, B2) connected in parallel, and an oscillator resistor (RL) is connected at the input of the second inverting amplifier. The same capacitor is connected to both output nodes, so that when the switching voltage applied to one of the inputs is low, current flows to one node, and the voltage at this node decreases. When it is high, the current flows to the other node, and the voltage of this node rises. The two nodes are complementary, so the voltage at both nodes varies alternately.

The output waveform of CD4528BCN is determined by the external resistance connected to the input nodes. If the external resistance is low, the waveform is rectangular; if it is high, the waveform is triangular. The symmetry between rising and falling edges can be adjusted by adjusting the external resistance value. By using a potentiometer, the pulse width of the output waveform can also be adjusted. The circuit can be used as a one-shot by triggering one of the inputs with a pulse.

In addition, CD4528BCN can also be used as an oscillator. To do this, both inputs must be kept at the same low switching state, and the output frequency is determined by the external oscillating resistor. By connecting a reset input at the same time, the circuit can also be used as an oscillator with manual reset.

In summary, CD4528BCN is a versatile CMOS timer, and its working principle and application field are easy to understand. It has the characteristics of low voltage operation and low power consumption, which makes it an ideal choice for various applications in signal processing and control.

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