74LVC646ADB,112

Overview

The 74LVC646ADB,112 is an octal bus transceiver and register with 3-state outputs manufactured by NXP Semiconductors. It features D-type flip-flops and control circuitry for multiplexed data transmission between internal registers. The device supports a supply voltage range from 1.2 V to 3.6 V and includes 5 V tolerant inputs and outputs for interfacing with 5 V logic systems. It operates within temperature ranges of -40 °C to +85 °C and -40 °C to +125 °C. The component is housed in an SSOP24 plastic shrink small outline package (SOT340-1) containing 24 leads.

Feature Summary

• Provides back-to-back registers for storage and real-time data transfer between buses
• Supports partial power-down applications with high-impedance I/O when VCC is 0 V
• Features separate controls for data flow direction and select source inputs for multiplexing
• Includes ESD protection compliant with JEDEC standards for HBM, MM, and CDM

Applications

• Mixed 3.3 V and 5 V logic level translation
• Octal bus data buffering and storage
• Partial power-down system configurations

Procurement Notes

Verify the specific ordering suffix '112' corresponds to the SSOP24 package variant SOT340-1 as defined in the official datasheet. Confirm that the required operating temperature range matches the specified industrial or extended limits. Ensure design compatibility with the recommended operating conditions regarding input transition rates and supply voltage stability before finalizing procurement.

Selection Notes

Select this component for designs requiring bidirectional octal data transfer with independent storage capabilities. It is suitable for applications needing direct interface with TTL levels and 5 V tolerance on both inputs and outputs. Consider the SSOP24 package constraints regarding body width and lead pitch during PCB layout planning.

Part Context

This part belongs to the 74LVC series of low-voltage CMOS logic devices produced by NXP Semiconductors. The LVC family is designed for operation at lower supply voltages compared to standard CMOS technologies while maintaining compatibility with various logic families. The 74LVC646A specifically addresses needs for complex bus interfacing with integrated latching functionality.

Replacement Considerations

Check for pin-compatible alternatives such as the 74LVC646AD (SO24 package) if different mounting styles are required. Verify functional equivalence with other octal bus transceivers from the same manufacturer or compatible third-party sources ensuring identical control logic and voltage tolerances.