onsemi MC74AC08DTR2G Quad 2-Input AND Gate: Datasheet, Pinout, and Application Circuits
The MC74AC08DTR2G from onsemi is a high-performance, Quad 2-Input AND Gate integrated circuit belonging to the advanced high-speed AC logic family. Housed in a space-saving TSSOP-14 package, this device is engineered for robust operation and is a fundamental building block in countless digital logic designs, from simple glue logic to complex computing systems.
Datasheet Overview and Key Specifications
The datasheet for the MC74AC08DTR2G reveals its core electrical characteristics and absolute maximum ratings, which are critical for reliable circuit design.
Logic Family: AC (Advanced CMOS), offering a superior balance of speed and power consumption.
Supply Voltage Range: Operates from 2.0V to 6.0V, making it compatible with 3.3V and 5V systems.
High-Speed Performance: Features a typical propagation delay (tPD) of 5.5 ns at 5V, enabling its use in high-frequency applications.
Low Power Consumption: The AC technology ensures very low static power dissipation.
Output Drive: Capable of sourcing/sinking 24 mA, allowing it to drive relatively high loads, including LEDs and other IC inputs.
Robustness: Features built-in ESD protection circuits, enhancing its durability in real-world environments.
Pinout Configuration
The MC74AC08DTR2G integrates four independent AND gates. Its TSSOP-14 pinout is standardized as follows:
Pins 1 (A1), 2 (B1), 3 (Y1); Pins 4 (A2), 5 (B2), 6 (Y2); Pins 9 (A3), 10 (B3), 8 (Y3); Pins 12 (A4), 13 (B4), 11 (Y4): These pairs represent the inputs (A, B) and output (Y) for each of the four AND gates. The output is HIGH only when all inputs are HIGH.
Pin 7 (GND): Ground reference (0V).
Pin 14 (VCC): Positive supply voltage pin (typically +3.3V or +5V).
Application Circuits
The primary function of an AND gate is to perform logical conjunction. Here are two common application circuits:
1. Simple Gating Circuit: The most straightforward use is to control the passage of a digital signal. One input (e.g., A) is connected to a data signal (e.g., a clock or pulse train), while the other input (B) is connected to an enable/control signal. The output (Y) will only mirror the data signal when the enable signal is HIGH. This is fundamental in data routing and multiplexing.
2. Address Decoding: In microprocessor or memory systems, multiple address lines must be combined to select a specific device or memory block. For example, combining two or more address lines with an AND gate (often part of a larger decoder network) can generate a Chip Select (CS) signal that is only active when all specified address lines are in the correct logic state.
In summary, the onsemi MC74AC08DTR2G is a highly reliable and efficient solution for digital logic operations. Its high-speed performance, wide operating voltage range, and robust output drive capability make it an excellent choice for modern electronic design. Whether for educational prototypes, industrial control systems, or advanced computing, this IC provides the essential logic function with the quality expected from a leading manufacturer.
Keywords: AND Gate, MC74AC08, Logic IC, TSSOP-14, onsemi
