CD54HCT175F3A

Overview

The CD54HCT175F3A is a high-speed CMOS logic device containing four D-type flip-flops with three-state outputs. It utilizes the HCT logic series, ensuring TTL-compatible input levels while maintaining low power consumption typical of CMOS technology. The component operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 25 MHz. It features a propagation delay of 40 ns and provides output drive currents of ±6 mA. The device is housed in a 16-lead ceramic dual in-line package (CDIP) and is rated for operation across an extended temperature range from -55 °C to +125 °C.

Feature Summary

• Contains four independent D-type flip-flops with positive-edge triggering.
• Outputs feature three-state capability for bus-oriented applications.
• Inputs are compatible with standard TTL logic voltage levels.
• Constructed using silicon-gate CMOS technology for low static power dissipation.

Applications

• Parallel data storage registers
• Shift register configurations
• Timing control circuits
• Bus interface buffers

Procurement Notes

Verify that the specific part number matches the military-grade CDIP packaging requirements, as commercial variants may differ in pinout or material specifications. Confirm that the supplier provides traceability documentation consistent with the 54-series standards. Ensure that the received components meet the specified electrical parameters for the HCT family before integration into sensitive timing circuits.

Selection Notes

Select this component when designing systems requiring synchronous data latching with bus isolation capabilities. The HCT series selection ensures compatibility with existing TTL-based control logic without level-shifting requirements. Consider the thermal rating and ceramic package durability if the application involves harsh environmental conditions or high reliability standards compared to plastic-packaged alternatives.

Part Context

This device belongs to the Texas Instruments 54HCT series, which bridges the performance gap between older TTL logic and modern CMOS efficiency. The 54-series designation indicates a military-grade quality level, offering wider operating temperature ranges and stricter manufacturing controls than the commercial 74-series counterparts. It serves as a fundamental building block for sequential logic design in aerospace and industrial control systems.

Replacement Considerations

The CD74HCT175EE4 is a documented equivalent within the same product family, though it typically utilizes a plastic DIP package rather than ceramic. Verify that the package material change does not impact mechanical constraints or thermal management requirements in the target assembly.