74LVC646APW,112

Overview

The NXP 74LVC646APW,112 is an octal bus transceiver and register featuring D-type flip-flops with 3-state outputs. It operates on a supply voltage range of 1.2 V to 3.6 V. The device supports 5 V tolerant inputs and outputs for interfacing with 5 V logic systems. It includes back-to-back registers for data storage and separate controls for data flow in each direction. The component complies with JEDEC standards for various voltage ranges and offers high ESD protection capabilities.

Feature Summary

• Provides non-inverting bus transceiver functionality with integrated D-type flip-flops and control circuitry.
• Supports multiplexed transmission of data directly from internal registers using select source inputs.
• Enables partial power-down applications by maintaining high-impedance inputs/outputs when VCC is 0V.
• Features 5 V tolerant I/Os allowing direct interface with TTL levels and mixed 3.3 V and 5 V applications.

Applications

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

Procurement Notes

Verify the specific package variant against the datasheet ordering information, as the APW suffix denotes TSSOP24. Confirm that the required temperature range aligns with the -40 °C to +125 °C specification provided for this part number. Ensure design compatibility with the 1.2 V to 3.6 V supply voltage limits before procurement.

Selection Notes

Select this component for designs requiring bidirectional data transfer between buses with independent storage capabilities. It is suitable for systems needing isolation modes where data can be stored without driving the bus. Consider the 5 V tolerance feature if interfacing with legacy 5 V logic devices while operating at lower voltages.

Part Context

This device belongs to the 74LVC family of logic components manufactured by NXP Semiconductors. It is designed for low-voltage CMOS applications, offering high-speed performance with low power consumption. The octal configuration allows for parallel data handling across two 8-bit buses simultaneously.

Replacement Considerations

Public confirmed substitute: SN74LV8T595PWR (Texas Instruments). Verify functional equivalence regarding pinout and electrical characteristics before substitution.

FAQ

How does the device handle data storage during isolation mode?

In isolation mode (OE = HIGH), data present at one bus can be stored in the corresponding register of the other bus without driving the output, allowing independent storage operations.

What is the input voltage tolerance of the 74LVC646A?

The inputs are 5 V tolerant, allowing them to accept signals up to 5.5 V even when the device is powered down or operating at lower supply voltages.