CD4527BE

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Logic – Specialty Logic (CD4527BE Application Field and Working Principle)

CD4527BE is a dual low-power dual retriggerable monostable multivibrator, or referred to as one-shot, or delay line. It is designed using Schottky circuits to reduce turn-on time and to minimize input currents while maintaining low power dissipation and minimum propagation delays. It is available in various packages and temperature ranges.

The CD4527BE has two independent sections, each of which can be triggered by either positive- or negative-going narrow pulses. A logic “1” level at the manual trigger input can also provide triggering. After triggering, the output(s) remains at a logic high for the duration of either the externally supplied retrigger delays or the internally generated timeout delays. After that, the output(s) returns to the original state.

Application Field.

One of the most popular applications of the CD4527BE is as a one-shot timer. With a specific set of input parameters and user-selected timing values, the CD4527BE can be used as a timer in a wide range of applications including delays, debouncing, restoration and measurement, motor control, and other repetitive operations. In addition, it can be used for counters, encoders, digital logic functions, remote control, and operational amplifiers.

The CD4527BE can also be used to create a timer circuit with a single output, with the ability to control the time period in the same way as a conventional digital clock circuit. The timing period range is typically from approximately 15ns to 500ms, and it can be synchronized to other devices and setpoints in order to extend timing resolution and accuracy.

As a delay line, the CD4527BE can also be used to generate signals with both rising and falling output edges. The outputs generated can then be used to control the delay or pulse width of the output pulse. The rising edge (Mh) of the output pulse is typically larger than the falling edge (Ml), giving the circuit the ability to “debounce” or reduce contact bounce when controlling relays or other mechanical components.

Working Principle

When the DC supply voltage is applied to the circuit, the output naturally assumes the “L” state. Upon application of an appropriate trigger pulse (negative going) to the TRIGGER input, the output goes to the  “H” state for a time period determined by the external R-C elements. If additional negative going trigger pulses are applied, their duration will be “added” to the previous timeout duration. After the last trigger pulse has expired, the output reverts to the “L” state.

The CD4527BE has separate external RC elements for each trigger pulse, which determines the time period for which the output will remain at the high state. The appropriate RC time constants must be chosen for each particular application. The CD4527BE also incorporates a manual reset feature, which allows the external reset line to control the output reset. The output reset line can be connected to a positive logic level, thus resetting the output without the assistance of an externally generated trigger pulse.

The main advantage of using the CD4527BE is its low power consumption, which is typically between 15μA and 50μA. This is significantly lower than similar devices, making the CD4527BE suitable for low power designs. The propagation delay of the circuit is also relatively low, typically between 2500ns and 1000ns, giving the circuit the ability to quickly respond to input signals.

In summation, the CD4527BE is an ideal one-shot timer for many applications. Its low power consumption and high accuracy makes it a great choice for applications ranging from motor control to digital logic functions. The CD4527BE is available in various packages for different temperature ranges and mounting options, which make it a flexible choice for design engineers.

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