SN74LS423DR

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Logic circuits, such as multivibrators, are important components in digital systems. The SN74LS423DR is a dual monostable multivibrator timing chip with two independent circuits that produces a single active-low output pulse when a low-to-high transition is detected at its input. This chip is an ideal choice for various low-power applicatios such as pulse redundancy and time-out features in microcomputer systems and for the generation of precision time delays.

The SN74LS423DR is a type of dual monostable multivibrator consisting of two independent comparator circuits. These comparator circuits consist of a pair of input latch circuits that can detect low-to-high transitions in their input signals. When a low-to-high transition is detected in either of the inputs, an output pulse is generated. The active-low output pulse is generated when the low-to-high transition is detected in the input and remains active until the input level returns to a low condition. The output pulse is adjustable by varying the resistor and capacitor values connected to the respective pins of the chip.

The SN74LS423DR has a wide range of applications due to its wide operating voltage range of 3 to 18 V and its guaranteed trigger characteristics. It can be used in various applications such as microprocessor systems, time-out features, handheld devices, end of line (EOL) testing, multiple algorithms, latch-up protection, circuit redundancy and saturation control. It is also suitable for triggering SPDT RF switches and generating precision narrow pulses. Its wide operating voltage range makes it ideal for applications involving CDMA and GSM phones as well as VLSI, MMIC and ASIC designs.

The SN74LS423DR is powered using a +5V or +3.3V logic supply and can be implemented using either CMOS or TTL logic levels. It has a propagation delay (tPD) of 25 ns and a typical pulse duration (tON) of 2.2 µs. The SN74LS423DR exhibits a high resistance to external noise and is immune from latch up. It is available in various packages ranging from 8-pin SOIC to 20-pin DIP and is RoHS compliant. The overall dimensions are also very small, making it a perfect choice for small, space-constrained applications.

In conclusion, the SN74LS423DR is a versatile dual monostable multivibrator timing chip with a wide range of applications due to its adjustable pulse duration, wide operating voltage range, noise immunity and low-power consumption. Its low-cost and easy-to-use design make it a perfect choice for various applications in embedded systems, automotive, communication and consumer electronics.

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