MC14528BD

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Logic circuits have been used for several centuries in the form of switches, relays, transistors, and more recently in integrated circuit form. The MC14528BD is a dual retriggerable monostable multivibrator circuit manufactured by ON Semiconductor. It is fabricated with advanced silicon gate CMOS technology and is packaged in a 16-pin Dual-In-Line plastic package. These devices are specifically designed to replace conventional bi-stable and astable multivibrators.

The MC14528BD is a dual monostable multivibrator that can be used for a variety of applications. It has two independent monostable multivibrator circuits which are triggered by a single external trigger. The MC14528BD is ideal for use as a time delay element in a variety of industrial and consumer products, such as in alarm systems, safety systems, consumer electronics and automotive products. It can also be used in logic circuits as a one-shot (which generates a pulse of fixed width on an active-high pulse output) or a retriggerable one-shot (which can generate continuously repeated pulses of fixed width on an active-low pulse output).

Application Field

The MC14528BD dual retriggerable monostable multivibrator is widely used in a variety of industries. It can be used to generate an alarm signal or as a timer in alarm systems, as an interface in consumer electronics such as DVD players, as an intermediate step in automotive safety products, or as a pulse generator in microprocessor circuits. Additionally, it can be used to create a one-shot pulse for generating a transient control signal in logic circuits.

Working Principle

The MC14528BD consists of two independent monostable multivibrator circuits, each of which is triggered by an external active-low trigger input. The trigger input can be either a logic level (logic 0) or a negative pulse (logic 1 to 0 transition). The pulse width of each output is controlled by an external capacitor and resistor. When the trigger input is asserted, the output of each multivibrator transitions low and stays low for a specified duration; then it transitions high until the next trigger input is applied. The pulse width of the output may be changed by varying the external capacitor and resistor values.

When the trigger input is asserted, the internal reset line is asserted low, which causes the output to transition low and remain low until the external capacitor is charged to a specific level. The pulse width (time delay) of the output is determined by the circuit constants, and is proportional to the charge time of the external capacitor.

The MC14528BD also contains an internal inhibition circuit that prevents it from being triggered more than once during a single output pulse. When the trigger input is asserted, the output pulse width is determined by the time required for the capacitor to reach its full charge. This internal inhibition circuit prevents the triggering of the device again until the output of the multivibrator has fully discharged the external capacitor.

The MC14528BD is a versatile device that can be used in a variety of applications. Its dual monostable multivibrator circuits can be used as one-shots to provide an active-high pulse, as retriggerable one-shots to provide a continuous pulse of a fixed width on an active-low pulse output, or as a timer in alarm systems and other control systems.

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