54F544DMQB

Overview

The 54F544DMQB is an octal registered bus transceiver manufactured by National Semiconductor. It operates on a single 5 V supply and features bidirectional data flow with independent control for each direction. The device provides three-state outputs that are inverted relative to the inputs. It is housed in a 24-pin ceramic dual in-line package (CDIP) designed for through-hole mounting. The component supports a wide operating temperature range from -55 °C to 125 °C, ensuring reliability in harsh environments.

Feature Summary

• Octal registered bus transceiver architecture providing eight-bit data storage and transfer capabilities
• Bidirectional data flow controlled independently for each direction of operation
• Three-state output capability allowing direct connection to system buses without additional drivers
• Inverted output polarity relative to input signals for specific logic interface requirements

Applications

• High-speed memory buffer applications requiring data registration
• Bidirectional bus driving in microprocessor-based systems
• Industrial control systems operating within extended temperature ranges
• Military aerospace electronic assemblies requiring ceramic packaging

Procurement Notes

Verify the manufacturer designation as National Semiconductor or Texas Instruments, as ownership transitions occurred. Confirm the 24-CDIP ceramic package specification matches the required form factor. Ensure the operating temperature range meets the -55 °C to 125 °C requirement for the intended environment. Check for RoHS compliance status if applicable to the project specifications.

Selection Notes

Select this component when an octal registered transceiver with ceramic packaging is required. It is suitable for designs needing bidirectional data transfer with independent direction control. The three-state outputs facilitate direct bus interfacing. Consider the inverted output polarity when designing the logic circuitry. Verify compatibility with 5 V logic levels and through-hole assembly processes.

Part Context

This part belongs to the 54F series of high-speed CMOS logic devices. The 54F544 variant specifically functions as an octal registered transceiver. The DMQB suffix indicates a military-grade version with a ceramic DIP package. These components are typically used in applications demanding high reliability and radiation hardness tolerance compared to standard commercial variants.

Replacement Considerations

The 54F544DM is a related variant with the same functional specifications but may differ in qualification level. Verify pinout compatibility before substitution. Ensure the replacement maintains the 24-CDIP package style. Confirm that the alternative source guarantees the same electrical characteristics and temperature range.