CD74AC74E

Overview

The CD74AC74E is a dual positive-edge-triggered D-type flip-flop manufactured by Texas Instruments. It features independent data (D), clock (CLK), preset (PRE), and clear (CLR) inputs for each of the two circuits. The device provides complementary outputs (Q and Q-bar). It operates within a supply voltage range of 1.5V to 5.5V, ensuring balanced noise immunity at 30% of the supply. Key electrical parameters include a propagation delay of 125 ns, high-level output current of -24 mA, and low-level output current of 24 mA. It is housed in a 14-pin PDIP package with through-hole mounting.

Feature Summary

• Dual positive-edge-triggered D-type flip-flops with independent control inputs
• Complementary outputs (Q and Q-bar) for each circuit
• Balanced noise immunity across the operating voltage range
• High drive capability with 24 mA output currents

Applications

• Parallel-to-serial data conversion circuits
• Shift register implementations
• General-purpose storage elements in digital logic systems
• Timing and synchronization applications

Procurement Notes

Verify the component matches the specific AC series characteristics and PDIP-14 package configuration. Confirm that the manufacturer identification aligns with Texas Instruments specifications. Ensure the part meets the required operating temperature range and voltage specifications for the intended application environment before finalizing procurement.

Selection Notes

Select this component when dual D-type storage with complementary outputs is required. Consider the 1.5V to 5.5V operating range for low-voltage compatibility. Evaluate the 125 ns propagation delay against system timing requirements. The PDIP-14 package is suitable for through-hole prototyping or manufacturing where surface-mount options are not preferred.

Part Context

The CD74AC74E belongs to the Texas Instruments AC Logic family, which combines CMOS input/output characteristics with speed comparable to bipolar technologies. This family is designed for general-purpose digital applications requiring reliable operation across a wide voltage range. The 'E' suffix denotes the PDIP package variant, distinguishing it from other packaging options like SOIC or TSSOP available within the same logical function family.

Replacement Considerations

Compatible substitutes include the CD74HC74E and CD74HCT74E from Texas Instruments, which offer similar functionality with different voltage thresholds. Other manufacturers may provide equivalent parts such as the MC74AC74DR2G. Verify pinout compatibility and electrical specifications before substitution.