The DM74H21N is a high-speed, dual 4-input AND gate manufactured by Rochester Electronics. This device belongs to the 74H series, known for its high speed and moderate power consumption compared to standard TTL logic. Rochester Electronics specializes in providing continued support for mature and end-of-life components, ensuring availability for long-term programs. This part is a reliable solution for implementing AND logic functions in various digital circuits.

Applications:

• Digital Logic Circuits: Used in combinational logic circuits, data processing, and control systems.
• Address Decoding: Employed in memory systems and microprocessor interfaces for address decoding.
• Data Multiplexing: Integrated into multiplexers and demultiplexers for data selection and routing.
• Control Logic: Utilized in industrial control systems, automation equipment, and process control systems.
• Legacy System Support: Provides a reliable source for maintaining and repairing older systems requiring this specific component.

Features:

• Dual 4-Input AND Gate: Contains two independent 4-input AND gates.
• High Speed Operation: Offers fast switching speeds for high-performance applications.
• Moderate Power Consumption: Provides a balance between speed and power efficiency.
• Wide Operating Voltage Range: Operates over a broad range of supply voltages.
• High Fan-Out Capability: Can drive multiple loads without significant signal degradation.
• DIP Package: Easy to use in breadboard and through-hole prototyping.

Benefits:

• Fast Switching Speeds: Enables high-speed data processing and control.
• Versatile Logic Function: Provides a basic building block for complex digital circuits.
• Easy to Use: Standard DIP package simplifies prototyping and circuit design.
• Guaranteed Availability: Rochester Electronics ensures continued availability of this component.
• Reliable Performance: Proven design and manufacturing provide dependable operation.

Additional Details:

The DM74H21N operates with a typical supply voltage of 5V DC. The propagation delay is typically in the nanosecond range (the exact value should be consulted from the datasheet). The operating temperature range is typically 0°C to +70°C. The N suffix indicates a plastic dual-in-line package (DIP). The output of the AND gate is high only when all four inputs are high; otherwise, the output is low. The high fan-out capability allows the gate to drive a significant number of other logic gates. Rochester Electronics ensures that the DM74H21N meets the original manufacturer's specifications, providing a reliable replacement for obsolete components.