74LVC623ADB,112

Overview

The 74LVC623ADB,112 is an octal bus transceiver from the NXP LVC/LCX/Z series, housed in a 20-lead SSOP package (SOT339-1). It features non-inverting 3-state outputs and dual enable inputs (OEAB, OEBA) for flexible asynchronous two-way communication. The device supports a supply voltage range of 1.2 V to 3.6 V and provides 5 V tolerant inputs and outputs. It operates within temperature ranges of -40 °C to +85 °C and -40 °C to +125 °C.

Feature Summary

• Dual enable configuration allows data storage by simultaneous enabling of both directions.
• 5 V tolerant inputs and outputs facilitate interfacing with 5 V logic systems.
• High-impedance state occurs when VCC is 0 V, supporting hot-swap applications.

Applications

• Asynchronous two-way communication between data buses
• Mixed 3.3 V or 5 V system translation
• Bus driver and transceiver implementations

Procurement Notes

Verify the ordering suffix '112' against official documentation, as the datasheet lists 'ADB' without this specific suffix. Confirm the package type matches SOT339-1 (SSOP20) and check the temperature grade (-40 °C to +125 °C) required for the application. Ensure compatibility with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36.

Selection Notes

Select this component for designs requiring bidirectional data transfer with independent direction control. The dual enable feature is critical for applications needing to latch bus states. Verify that the input transition rates comply with the specified limits for the chosen supply voltage to ensure signal integrity.

Part Context

This part belongs to the 74LVC623A family of octal transceivers. It shares functional characteristics with variants like 74LVC623AD and 74LVC623APW, differing primarily in packaging. The LVC series is designed for low-voltage CMOS applications with high speed and low power consumption.

Replacement Considerations

Direct substitutes include 74LVC623AD (SO20 package) and 74LVC623APW (TSSOP20 package), provided the pinout and electrical specifications remain compatible with the current design constraints.

FAQ

How does the dual enable function operate?

Simultaneous enabling of OEAB and OEBA isolates the buses while reinforcing inputs, allowing the device to store data if other sources are in a high-impedance state.

What is the behavior when VCC is 0 V?

The outputs enter a high-impedance state, preventing current flow even if up to 5.5 V is applied to the I/O pins.