74LVC646AD,112

Overview

The 74LVC646AD,112 is an octal bus transceiver and register featuring 3-state outputs. It integrates D-type flip-flops for data storage and control circuitry enabling multiplexed transmission from internal registers. The device supports bidirectional data flow between two buses with separate direction controls. It operates within a supply voltage range of 1.2 V to 3.6 V and accepts inputs up to 5.5 V. The component is housed in an SO-24 package (SOT137-1) and functions across temperatures from -40 °C to +125 °C.

Feature Summary

• Provides back-to-back registers for data storage and real-time transparent mode operation
• Supports partial power-down applications with high-impedance I/O when VCC is 0 V
• Features 5 V tolerant inputs and outputs for interfacing with 5 V logic systems
• Includes ESD protection exceeding specified JEDEC standards for Human Body, Machine, and Charged Device Models

Applications

• Mixed 3.3 V and 5 V system translation
• Bidirectional bus driver applications
• Registered transceiver circuits requiring data storage

Procurement Notes

Verify the specific ordering suffix '112' corresponds to the SO-24 plastic small outline package variant. Confirm that the required temperature range covers the full industrial specification of -40 °C to +125 °C. Ensure design compatibility with the 1.2 V to 3.6 V supply voltage limits and 5.5 V input tolerance requirements before finalizing procurement.

Selection Notes

Select this component for designs requiring octal bidirectional data transfer with integrated latching capabilities. It is suitable for mixed-voltage environments due to its 5 V tolerant inputs. Consider the SO-24 package dimensions and thermal derating characteristics if operating near maximum ambient temperatures. Verify signal integrity requirements against the specified propagation delays at the target supply voltage.

Part Context

This part belongs to the 74LVC646A family of octal bus transceivers manufactured by NXP Semiconductors. The 'AD' designation indicates the SO-24 package type, while the ',112' suffix typically denotes the specific reel or tape packaging configuration used for surface-mount assembly. It is part of the broader LVC logic series designed for low-voltage CMOS applications.

Replacement Considerations

Check for direct functional equivalents within the same LVC family. Verify pinout compatibility and electrical specifications such as supply voltage ranges and output drive strengths. Ensure any substitute component meets the same temperature and ESD protection standards.