SN74ALS174D

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A flip-flop is an electronic device which can be used as a logic gate to store a single bit of data. It is also known as a bi-stable logic circuit, which means it can stay in either of two states indefinitely, once switched from one state to another. These basic devices form the building blocks of modern digital technology, providing memory, sequencing and control for the digital circuits found in devices like computers and cell phones. Flip-flops are available in a variety of logic gate families, including the popular SN74ALS174D.

SN74ALS174D Application Field

The SN74ALS174D is a dual D-type flip-flop with individual clock and clear (reset) inputs. This is part of the Texas Instruments series 74ALS (Advanced Low-Power Schottky) logic family and is meant for use in applications with moderate speed and power requirements. Typical applications include data sampling and latching, shift registers, binary counters, delay lines and high-speed counting.

The SN74ALS174D flip-flop is available as a standard package, as well as a surface-mount option. It is designed with a wide range of inputs, including buffered and unbuffered versions with Schmitt-trigger input. The buffered Schmitt-trigger input makes it ideal for high-speed applications with relatively low speed signals, such as the digital control of motors and other equipment.

The SN74ALS174D features a power down control function, allowing the outputs to be disabled and the power consumption minimized. The device has a very low-power design making it ideal for battery-powered applications. The device operates from a 5V power supply and is rated from -55 to 125°C.

SN74ALS174D Working Principle

The SN74ALS174D is a dual D-type flip-flop, meaning that it can store two bits of data at the same time. It is designed to switch the data stored in its two-bit memory (D1 and D2) between high and low logic levels at a given clock input (CLK1 and CLK2). With a given logic level at the data inputs (D1 and D2) and the clock input, the flip-flop’s output will remain in the same state even after the input signals change.

The SN74ALS174D can be used in two different modes: volatile and non-volatile. In volatile mode the device keeps the output state for the duration of the clock pulse, but when the clock pulse expires the data is lost. In contrast, non-volatile mode retains the data even after the clock pulse has ended and can be used when long-term storage is required.

The device also features a clear (reset) input known as RES1 and RES2. This allows the user to reset the state of the flip-flop to 0 (low logic level) regardless of the data inputs or the state of the clock input. The clear/reset input also allows the outputs to be set to 0 before the data inputs and the clock input are set.

The SN74ALS174D can also be used in conjunction with many other logic device families. It is designed to connect with standard two-pin connectors and is thus compatible with most other series 74 logic families, making it a popular choice for applications in which more than one logic family is required.

Conclusion

The SN74ALS174D dual D-type flip-flop is a versatile device with many applications. Its wide range of inputs, power down control function, low-power design, and compatibility with other logic families make it a popular choice for many digital projects. Its ability to store two bits of data simultaneously, coupled with its non-volatile and volatile modes of operation, make it ideal for use in data sampling and latching, shift registers, binary counters, delay lines and high-speed counting applications. The SN74ALS174D provides the perfect combination of speed, power, versatility and reliability.

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