CD4527BNSR Integrated Circuits (ICs)

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The CD4527BNSR IC is a member of the Texas Instruments family of logic devices, under the category of Specialty Logic. It is a high-speed dual monostable multivibrator intended for general-purpose timing and pulse generation applications. With its wide operating temperature range and extensive power supply range, the CD4527BNSR can be used in an array of common and specialised applications, with its precision timing and versatile pulse characteristics.

Applications

The most common applications of the CD4527BNSR are:

• Pulse stretching
• Clock and data steering
• Automatic switch controls
• Time sequencing
• Division of frequency
• Pulse generation
• Industrial controllers
• Automotive applications
• Experiment control
• High-temperature applications

These applications make use of the CD4527BNSR in conditions that require reliable timing, precision, and long-term accuracy in order to provide products of the highest quality. Furthermore, the device can be used in specialty applications involving high-temperature operation.

Working Principle

The CD4527BNSR is a type of dual monostable multivibrator that consists of two independent, non-re-triggerable one-shots that are triggered by logic inputs. Both one-shots share a common reset input. When a pulse is applied to the trigger input of one or both one-shots, the output of the appropriate one-shot will go VIPT (very-high-impedance current transfer) for a predetermined amount of time before returning to low (ground) state. The width of the output pulse is independent of the triggering pulse duration, and is determined by an on-chip timing capacitor CT, RC network, and an external resistor R.

When the form of the triggering pulse is either low (ground) or floating, the output remains low (ground) until the reset pulse is removed. In addition, the duration of the reset pulse must be longer than the time required for the output to reach VIHT state. When correctly set up, the CD4527BNSR is capable of providing timing accuracy of ± 0.5% over temperature, and a typical pulse width of 1.3 µs (at 25 °C).

Power Supply Considerations

The CD4527BNSR requires both a supply voltage and ground connection. The supply voltage connection should be connected to a power source that can deliver at least 4.5 VDC. The maximum supply voltage must not exceed 18 VDC. In order to ensure consistent performance, the power supply voltage should remain as constant as possible.

In addition, when external capacitors are used to reduce ripple, their value must not be greater than 22 µF, as this can cause a performance decrease due to the internal bias current of the device. In addition, the logic inputs and outputs of the device should not be taken beyond the maximum power dissipation of the IC. Exceeding this limit can cause permanent damage to the device.

Functional Diagram

The CD4527BNSR is designed for use in two-state toggle flip-flop applications. For this purpose, it contains two independent, non-re-triggerable one-shots with common reset inputs. Each one-shot consists of a trigger input, a reset input, and an output. When the trigger input is activated, the appropriate one-shot will go VIPT for a predetermined amount of time before returning to low (ground) state.

The CD4527BNSR is configured with a trigger input and reset input on each one-shot and an RC network with resistor R connected to a timing capacitor C. When a pulse is applied to the trigger input of one or both one-shots, the RC network and timing capacitor will affect the width of the output pulse. The voltage across the timing capacitor determines the width of the output pulse, which is independent of the duration of the triggering pulses.

Summary

The CD4527BNSR is a dual monostable multivibrator designed to provide reliable timing, precision, and long-term accuracy in applications where pulse stretching and timing sequencing are required. When correctly set up, the CD4527BNSR is capable of providing timing accuracy of ± 0.5% over temperature and a typical pulse width of 1.3 µs (at 25 °C). The device is suitable for use in various industrial and automotive applications, as well as in high-temperature applications.

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