CD54HCT273F

Overview

The CD54HCT273F is a high-speed CMOS logic octal D-type flip-flop with reset, manufactured by Texas Instruments. It features eight independent D-type flip-flops in a single package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports TTL-compatible inputs. Key electrical parameters include a maximum propagation delay of 30 ns at 4.5 V with 50 pF load capacitance and a clock frequency of 50 MHz. It is housed in a 20-CDIP package and functions across an extended temperature range of -55°C to 125°C.

Feature Summary

• Octal configuration providing eight independent D-type flip-flops for parallel data storage
• High-speed CMOS technology enabling operation up to 50 MHz clock frequency
• TTL-compatible input structure allowing direct interfacing with standard logic families
• Integrated reset functionality for synchronous or asynchronous clearing of outputs

Applications

• Parallel-to-serial data conversion circuits
• Shift register implementations in digital systems
• Memory buffer stages in microprocessor interfaces
• State machine output latching applications

Procurement Notes

Verify the specific manufacturer marking code and date code on the component body to ensure authenticity from Texas Instruments. Confirm that the 20-CDIP package matches the required footprint for the target PCB design. Check RoHS compliance status if environmental regulations apply to the final assembly. Ensure the operating temperature range meets the system's thermal requirements given the -55°C to 125°C specification.

Selection Notes

Select this component when an octal D-type flip-flop with reset is required in a through-hole 20-CDIP package. It is suitable for applications needing TTL-compatible inputs and high-speed performance up to 50 MHz. Consider the extended industrial temperature range (-55°C to 125°C) for harsh environments. Compare against SN74HCT273 variants if surface-mount packaging is preferred instead of ceramic DIP.

Part Context

The CD54HCT273F belongs to the HCT (High-speed CMOS Technology with TTL compatibility) logic family from Texas Instruments. This series bridges the gap between older TTL logic levels and modern CMOS power efficiency. The '54' prefix typically denotes military-grade temperature ranges and reliability standards compared to the commercial '74' series. It serves as a foundational building block for sequential logic designs requiring multiple synchronized data storage elements.

Replacement Considerations

SN74HCT273N: Commercial grade equivalent in PDIP-20 package with similar electrical characteristics but limited to 0°C to 75°C operating range.