SN74ABT821ANSR

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The SN74ABT821ANSR belongs to Logic - Flip Flops, which, in simple words, are digital devices to store a single bit - ‘0’ or ‘1’ - and change the output value with reference to the clock input. The device is a dual non-retriggerable mono-stable multivibrator which, in conjunction with a dual clock input, forms a dual retriggerable mono-stable multivibrator. This article will thus focus on the application field, as well as the working principle, of the SN74ABT821ANSR.

Application Field

The SN74ABT821ANSR for Logic - Flip Flops is ideal for data acquisition and other wide-data-rate applications or applications needing a low event jitter. It is used to acquire data from asynchronous analog-to-digital and position encoders to synchronize digital data. As a two-clock input device, it could also be used in applications where clock domain crossing is needed. Its output voltage is also compatible with ECL and CML, making it suitable for high-speed and mixed-level logic operations.

Working Principle

The SN74ABT821ANSR contains two non-retriggerable mono-stable multivibrators with a dual clock input. A non-retriggerable means that each output can be triggered and remain high until a low input is provided. When that input is provided, the output will go low. The device is dual-clock, meaning each output is triggered on both the leading and trailing edge of the clock signals. The first clock starts the process – this is the ‘initiate’ clock, while the second clock ‘validates’ the output. This means that even if there is a disturbance in the input while the first clock is triggered, the second clock can still validate the output.

Moreover, the SN74ABT821ANSR has a minimum propagation delay of 1.8ns. This means that it is suitable for high-speed applications, where the device can respond quickly to changes in the logic levels of the input signals. Additionally, it allows a maximum frequency of 250MHz, which makes the device the perfect fit for applications handling large amounts of data in a short time. The device also works with a wide supply voltage range of 2.5 V to 5.5 V, making it very versatile for different application fields as well.

Conclusion

All in all, the SN74ABT821ANSR for Logic - Flip Flops is an ideal device for any application requiring data acquisition with high speed and low event jitter. It has a wide supply voltage range and can support a maximum frequency of 250MHz, with a minimum propagation delay of 1.8ns. Furthermore, it has dual clock input, making it suitable for applications needing clock domain crossing, as well as being compatible with ECL and CML.

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