The 74ACT823 is a 9-bit D-type flip-flop with 3-state outputs. It is part of the Advanced CMOS Technology (ACT) logic family, designed for high-speed and low-power applications. The device is often used in memory address drivers, clock drivers, and bus-oriented applications.

Applications

• Memory address registers
• Clock drivers
• Data bus transceivers
• Microprocessor systems
• High-speed logic circuits

Features

• 9-bit D-type flip-flops
• 3-state outputs
• High-speed operation
• Low power consumption
• TTL compatible inputs
• Positive edge-triggered clock
• Direct clear input
• Multiple package options (e.g., DIP, SOIC)

Benefits

• Provides reliable storage for 9 bits of data
• 3-state outputs allow for bus isolation
• High speed enables use in demanding applications
• Low power consumption reduces system power requirements
• TTL compatible inputs simplify interfacing with other logic families
• Direct clear input allows for easy initialization

Additional Details

The 74ACT823 consists of nine D-type flip-flops with a common clock and clear input. Data is transferred to the outputs on the positive-going edge of the clock pulse. The 3-state outputs can be enabled or disabled using an output enable (OE) input. When OE is low, the outputs are enabled, and the data stored in the flip-flops is available at the outputs. When OE is high, the outputs are in a high-impedance state, effectively disconnecting the device from the bus. This feature is useful in bus-oriented systems where multiple devices share the same bus lines. The device operates from a 5V power supply and provides TTL compatible inputs, making it easy to interface with other TTL and CMOS logic devices. It is available in various packages, including DIP (Dual In-line Package) and SOIC (Small Outline Integrated Circuit). The 74ACT823 is designed for operation over a wide temperature range, typically from -40°C to +85°C. Proper decoupling capacitors should be used to minimize noise and ensure stable operation. The clear input allows all flip-flops to be reset to a low state asynchronously, regardless of the clock input. The propagation delay from clock to output is typically in the nanosecond range, making it suitable for high-speed applications.