74LCX16646MTDX

Overview

The Fairchild Semiconductor 74LCX16646MTDX is a 16-bit bus transceiver with register functionality, fabricated using BiCMOS technology. It operates within a supply voltage range of 2.0 V to 3.6 V and features 3-state outputs. The device provides a low-level output current of 24 mA and a high-level output current of -24 mA. Packaged in a 56-pin TSSOP, it supports non-inverting data transfer and is designed for low-voltage applications while maintaining compatibility with 5V signal environments.

Feature Summary

• Integrates 16-bit bus transceiver and register functions for efficient data handling
• Enables interfacing between low-voltage logic and 5V signal environments
• Provides high drive capability with 24 mA output current strength

Applications

• Low-voltage memory interface circuits
• High-speed data communication systems
• Bus-oriented architectures requiring level shifting

Procurement Notes

Verify the manufacturer status carefully, as sources indicate this part may be discontinued or scheduled for obsolescence by onsemi. Confirm availability through authorized distributors, as stock levels are limited. Ensure the specific MTDX suffix matches your reel requirements. Cross-reference datasheets from both Fairchild and onsemi to confirm pinout and electrical specifications remain consistent across legacy documentation.

Selection Notes

Select this component when designing systems that require 16-bit bidirectional data transfer with latching capabilities at low voltages. It is suitable for applications needing robust drive strength (24 mA) to support multiple loads. Consider the TSSOP-56 package constraints for PCB layout. Verify that the 2.0 V to 3.6 V operating range aligns with your system's power rails and that 5V tolerance is required for input/output interfaces.

Part Context

This device belongs to the LCX series, which utilizes advanced BiCMOS technology to achieve high speed and low power consumption. The LCX family is designed for low-voltage operations, typically 2.5V or 3.3V, while offering compatibility with older 5V logic standards. The 74LCX16646 specifically combines transceiver and register functions, making it distinct from standard transceivers like the LVTH series by providing internal storage for data lines.

Replacement Considerations

The 74LVTH16646MTDX is a related variant but operates at different voltage levels and lacks the same 5V compatibility characteristics. Verify if the register function is strictly necessary; if not, simpler transceivers may suffice. Check for direct equivalents from other manufacturers such as NXP or Texas Instruments that offer similar 16-bit LVC/LCX specifications in a 56-pin TSSOP package.