74LVC646APW,118

Overview

The 74LVC646APW,118 is an octal bus transceiver and register with 3-state outputs manufactured by NXP USA Inc. It operates within a supply voltage range of 1.2 V to 3.6 V and features 5 V tolerant inputs and outputs for interfacing with 5 V logic systems. The device includes D-type flip-flops and control circuitry for multiplexed data transmission between two buses. It supports partial power-down applications where inputs and outputs become high-impedance when VCC is 0 V. The component is housed in a TSSOP24 package (SOT355-1) and complies with JEDEC standards for various voltage ranges.

Feature Summary

• Provides non-inverting bus transceiver functionality with 3-state outputs and integrated D-type flip-flops for data storage.
• Features 5 V tolerant inputs and outputs, enabling direct interface with TTL levels and mixed 3.3 V/5 V applications.
• Supports partial power-down modes by rendering inputs and outputs high-impedance when the supply voltage is zero.

Applications

• Mixed 3.3 V and 5 V translation applications
• Partial power-down system designs
• Multiplexed data transmission circuits

Procurement Notes

Verify the specific ordering suffix

Selection Notes

Select this component for designs requiring bidirectional data transfer between 8-bit buses with independent direction control. It is suitable for systems needing simultaneous real-time transmission and internal data storage via separate clock inputs. Ensure the operating voltage aligns with the 1.2 V to 3.6 V range and consider the TSSOP24 package constraints for PCB layout.

Part Context

This part belongs to the 74LVC family of low-voltage CMOS logic devices. It functions as an octal bus transceiver with registers, distinct from simple buffers or latches. The APW suffix indicates the TSSOP24 plastic thin shrink small outline package variant, designed for surface-mount assembly with a body width of 4.4 mm.

Replacement Considerations

Check for pin-compatible alternatives within the same 74LVC series that offer identical TSSOP24 packaging. Verify that any substitute maintains the 5 V tolerance specification and supports the required partial power-down functionality if critical to the design.