74LCX16821MEAX

Overview

The Fairchild Semiconductor 74LCX16821MEAX is a 18-bit bus transceiver with 3-state outputs, designed for low-voltage (2.5V or 3.3V) applications while maintaining compatibility with 5V signal environments. It features an A/B bus configuration and includes D-type flip-flops for registered data transmission. The device operates within a supply voltage range of 2.0V to 3.6V and supports an operating temperature range from -40°C to +85°C. Packaged in a 48-pin TSSOP format, it facilitates efficient data transfer between microprocessors and memory devices.

Feature Summary

• Supports 5V tolerant inputs and outputs for seamless interfacing with legacy systems
• Provides registered data storage via internal D-type flip-flops controlled by clock pins
• Features independent output enable controls for flexible bus direction management

Applications

• High-density data acquisition systems
• Memory buffer interfaces
• Portable computing equipment
• Communication controllers

Procurement Notes

Verify the specific suffix 'MEAX' against official Fairchild documentation to confirm package type and tape/reel specifications. Ensure compliance with RoHS directives and lead-free manufacturing standards required for your assembly process. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this component when designing systems requiring high pin-count data buses with registered output capabilities at low voltages. It is suitable for replacing older 74FCT or 74ACT series devices where power consumption reduction is critical. Consider the 48-pin TSSOP footprint constraints and thermal dissipation requirements during PCB layout planning.

Part Context

This part belongs to the LCX family of logic integrated circuits, characterized by advanced CMOS technology optimized for low-voltage operation. The LCX series bridges the gap between traditional 5V logic and modern 3.3V/2.5V systems, offering reduced power consumption without sacrificing speed or noise immunity. It complements other LCX components like buffers and gates in mixed-voltage designs.

Replacement Considerations

Direct substitutes may include the 74LCX16821MTX or 74LCX16821DLR depending on package preference. Verify electrical characteristics and pinout compatibility before substitution. Alternative families such as LVC or LVX may offer similar functionality but require careful evaluation of switching speeds and drive strengths.