74ACTQ16646MTDX

Buffers, Drivers, Receivers, Transceivers Overview

The 74ACTQ16646MTDX is a 16-bit bus transceiver and register featuring 3-state outputs, manufactured by onsemi (formerly Fairchild Semiconductor). It belongs to the ACTQ logic series and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides a propagation delay of 9.4 ns and supports TTL input levels with CMOS output levels. It offers a low-level output current of 24 mA and a high-level output current of -24 mA. The component is housed in a TSSOP-56 package and functions as a non-inverting transceiver/register with two internal circuits across sixteen channels. It is rated for an operating temperature range from -40°C to +85°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Combines registered storage and bidirectional bus transmission capabilities in a single 16-bit device
• Features 3-state outputs designed for efficient bus-oriented applications
• Provides TTL-compatible inputs ensuring compatibility with standard logic families
• Delivers high drive capability with 24 mA source and sink output currents

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented data transmission systems requiring registered interfaces
• High-speed digital signal routing in computer architectures
• Memory interface circuits utilizing 3-state bus protocols

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'MTDX' against official manufacturer documentation to confirm tape-and-reel packaging specifications, as generic datasheets may only list 'MTD'. Confirm that the part number corresponds to the ACTQ series rather than standard ACT variants. Check for obsolescence status or lifecycle notices from onsemi, as this component originates from the Fairchild Semiconductor portfolio which has undergone corporate integration. Ensure pinout compatibility matches the TSSOP-56 JEDEC standard before procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when a design requires both latching functionality and bidirectional bus driving for 16-bit data paths. The ACTQ series is suitable for applications needing improved noise immunity compared to standard AC/ACT logic. Verify that the 5V supply voltage aligns with the system power rails. Consider the TSSOP-56 package constraints regarding thermal dissipation and PCB space. Ensure the 9.4 ns propagation delay meets the timing requirements of the target clock frequencies.

Buffers, Drivers, Receivers, Transceivers Part Context

This component is part of the 74ACTQ family, which integrates quadrature decoding or advanced registration features alongside standard bus transceiver operations. It succeeds earlier 74FCT and 74ACT equivalents by offering enhanced performance characteristics. The device represents the transition period where Fairchild Semiconductor products were integrated into onsemi's portfolio, leading to potential nomenclature changes such as underscore to dash conversions in ordering codes.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Consult official cross-reference guides for direct substitutes like the 74FCT16646 or 74ACT16646 if registration features are not required. Verify pin-to-pin compatibility with other 56-pin TSSOP bus transceivers. Note that generic 74ACT16646 parts lack the specific Q-series enhancements documented in the official datasheet.