CD4093BCM

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CD4093BCM, also known as CMOS quad 2-input NAND Schmitt triggers, is a logic gate that performs NAND functions and features with Schmitt triggers implemented internally. This type of logic gate is used in a variety of applications gaining most of its popularity due to its level and noise immunity and above being part of the family of CMOS (Complementary Metal-Oxide Semiconductor) technology which is known for its low power consumption, high speed and ease of use and integration.

Basic Description

CD4093BCM provides two 2-input logic functions. Each input terminal of each of these two NAND gates includes a Schmitt trigger circuit which is used to reduce the amount of noise generated when changing a logic state. Each Schmitt trigger includes two voltage levels: a positive reset threshold level and a positive trigger threshold level, storing the hysteresis function and providing a considerable amount of noise immunity.

Application Fields

CD4093BCM NAND Schmitt triggers are used in applications related to sensor control, mobile phone additions, switching power supplies and waveform generation. On sensors, NAND Schmitt triggers can aid in the noise immunity of motion detection, shutter control and thermal noise. Mobile phones and other communications devices often use NAND Schmitt triggers in their power on and off circuits, ensuring an accurate, low noise start-up for such systems. Switching power supplies use NAND Schmitt triggers to route power to different components, such as displays and voltage regulators. NAND Schmitt triggers are also used in signal waveform generation, providing a square wave output and a frequency determining resistor.

Working Principle

The CD4093BCM logic gate NAND Schmitt trigger works according to the hysteresis principle. Two slightly offset voltage levels are set at the input pins so that when a signal passes one level it causes a logical high or low on the output pin, and when the signal passes the other direction it passes the other logic level on the output pin. This provides a much more reliable operation in noise prone applications.

The role of the CD4093BCM is mainly to detect differences between input and output signals. When the input exceeds the positive-going threshold voltage, the output changes from low to high. Conversely, when the input decreases past the negative-going threshold voltage, the output will go from high to low.

Conclusion

CD4093BCM NAND Schmitt triggers are reliable and efficient logic gates that are used in a variety of applications to increase noise immunity and provide low-power operation as part of the CMOS family. The working principle of these logic gates is a combination of NAND logic functions and hysteresis, creating two slightly offset voltage levels that make the gate operate reliably in noisier environments.

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