DM74AS652NT

Overview

The DM74AS652NT is an octal bus transceiver and register belonging to the AS (Advance Schottky) series. It integrates eight D-type flip-flops with bidirectional data transmission capabilities, allowing multiplexed transfer of data directly from input buses or internal registers. The device features true outputs and operates within a standard TTL voltage range. Packaged in a 20-pin DIP format, it provides independent output enable controls for each direction, facilitating flexible interface configurations in high-speed digital systems.

Feature Summary

• Integrates octal bus transceiver circuits with D-type flip-flops for registered data storage
• Supports multiplexed transmission of real-time data from input buses or stored data from internal registers
• Provides independent control over output enable functions for each transmission direction

Applications

• Memory interface circuits requiring registered data buffering
• Microprocessor system data bus architectures
• Communication systems utilizing asynchronous bidirectional data buses

Procurement Notes

Verify the specific suffix 'NT' against official Fairchild Semiconductor documentation to confirm package type and temperature grade. Ensure compatibility with existing 74AS logic families. Confirm availability status as older AS series components may have limited production runs. Cross-reference pinouts with equivalent parts like DM74ALS652 if substitution is considered.

Selection Notes

Select this component when Advance Schottky speed is required alongside registered bus functionality. It serves as a direct upgrade path for legacy Schottky designs needing improved switching performance with lower power dissipation. Consider the 20-pin DIP package constraints for board layout. Verify that the 3-state output characteristics meet the drive requirements of the connected transmission lines.

Part Context

This part belongs to the DM74AS family, which utilizes an advanced oxide-isolated, ion-implanted Schottky TTL process. This technology offers improved switching response and reduced power consumption compared to standard Schottky counterparts while maintaining functional and pin compatibility with 74LS logic devices. The family is designed for memory, microprocessor, and communication applications.

Replacement Considerations

The DM74ALS652 is a documented alternative within the same manufacturer's portfolio, offering similar functionality with low-power Schottky characteristics. Verify electrical parameter alignment before substitution.