CD74HC221NSR

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Logic - Multivibrators are circuits with two states that initiate and maintain oscillating signals. The CD74HC221NSR fall into this category and includes a unique application field and working principle.

The CD74HC221NSR is a dual monostable multivibrator, which utilizes a pulse output technology to minimize power consumption when employed in electronic equipment requiring repetitive switching. It works off of a single supply voltage and has two independent circuits. Each circuit oscillates once in response to a triggered pulse and holds its output state until the same input pulse is given. When the pulse is held for a certain period, the output of the circuit will revert back to its non-oscillating state. This means that the CD74HC221NSR is well-suited to applications in which high pulse energization efficiency is needed, such as digital logic operations, timing, signal detection, signal conditioning, signal conversion, and analog-to-digital signal transfer.

The CD74HC221NSR produces one output pulse for each input trigger pulse and its pulse width is determined by an external capacitor and resistor. Its input pins are TTL-compatible and its output is a standard five-volt TTL output level. Its maximum frequency is 30 MHz and its operating temperature range is from -40°C to 125°C. Furthermore, the CD74HC221NSR is immune to latch-up and meets the requirements of EMC/EMI standards.

The output open-drain circuit of the CD74HC221NSR ensures it does not need the logic operations of other extra chips. The voltage difference between the high level and low level is only 0.3V, allowing it to save power on the operating current. It also has a small temperature drift between 25℃ to 85℃. In addition, the CD74HC221NSR has an active-high reset input to clear logic 1, allowing the user to directly reset the circuit when ever necessitated.

The CD74HC221NSR is characterized by extremely high noise immunity and offers high peripheral current capacities and low power dissipation. This makes it ideal for a range of applications such as delay circuits, single-shot and pulse brake-off / break-on circuits, video and audio circuits, error detection and correcting circuits, and constant current beds.

In summary, the CD74HC221NSR is a dual monostable multivibrator with multiple applications including digital logic operations, timing, signal conditioning, and signal transfer. It is characterized by low power consumption, high noise immunity and low drift of pulse width. Its open-drain circuit eliminates the need for extra chips, and its active-high reset input allows it to be quickly reset if needed. Its wide range of applications make it an ideal choice for a range of digital and analog circuits.

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