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The HC74 is a dual positive-edge-triggered D-type flip-flop integrated circuit (IC) manufactured by various semiconductor companies, such as Texas Instruments, NXP, and ON Semiconductor.

Key Specifications:

• Logic Family: HC (High-Speed CMOS)
• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage (V_IH): 3.15V (at 4.5V supply)
• Low-Level Input Voltage (V_IL): 1.35V (at 4.5V supply)
• High-Level Output Current (I_OH): -5.2mA (at 4.5V supply)
• Low-Level Output Current (I_OL): 5.2mA (at 4.5V supply)
• Propagation Delay (t_pd): ~15ns (typical at 5V supply)
• Operating Temperature Range: -40°C to +85°C
• Package Options: SOIC, PDIP, TSSOP

Description:

The HC74 contains two independent D-type flip-flops with individual data (D), clock (CLK), set (SD), and clear (CD) inputs. Each flip-flop stores a single bit of data and updates its output (Q and Q̅) on the rising edge of the clock signal.

Features:

• Positive-edge triggering for synchronous operation
• Asynchronous set (SD) and clear (CD) inputs (active LOW)
• Complementary outputs (Q and Q̅) for each flip-flop
• Low power consumption (typical CMOS power dissipation)
• Wide operating voltage range (2V to 6V)
• Balanced propagation delays for reliable timing
• High noise immunity due to CMOS technology

The HC74 is commonly used in digital circuits for data storage, synchronization, and sequential logic applications.