74LVC623ADB,118

Overview

The NXP USA Inc. 74LVC623ADB,118 is an octal bus transceiver featuring non-inverting 3-state outputs in both send and receive directions. It operates within a supply voltage range of 1.2 V to 3.6 V and supports 5 V tolerant inputs and outputs for interfacing with 5 V logic. The device utilizes dual enable inputs (OEAB and OEBA) to control data transmission direction between the An and Bn buses or to isolate them. It is housed in a 20-lead SSOP plastic shrink small outline package (SOT339-1) and is specified for operation from -40 °C to +125 °C.

Feature Summary

• Dual enable configuration allows flexible timing control, enabling data transmission in either direction or isolating buses by disabling the device.
• Simultaneous enabling of both control inputs reinforces input signals, allowing the transceiver to store data when other bus sources are in a high-impedance state.
• Inputs can be driven from 3.3 V or 5 V devices, facilitating use as translators in mixed-voltage applications.
• Outputs remain at high-impedance when VCC is 0 V, preventing destructive backflow current during partial power-down scenarios.

Applications

• Asynchronous two-way communication between data buses
• Mixed 3.3 V and 5 V logic level translation
• Bus isolation and data storage configurations

Procurement Notes

Verify that the specific ordering suffix ',118' corresponds to the SSOP20 package (SOT339-1) variant rather than the SO20 or TSSOP20 versions. Confirm the required temperature range matches the -40 °C to +125 °C specification provided for this package type. Ensure design compatibility with the dual active-low enable inputs before finalizing procurement.

Selection Notes

Select this component when bidirectional octal data transfer with independent enable control is required. The dual enable feature distinguishes it from standard single-enable transceivers by supporting data latching modes. Verify that the 5 V tolerance on inputs and outputs meets the interface requirements of the connected logic families without additional level shifting components.

Part Context

This part belongs to the 74LVC623A family of octal transceivers. While the base model number indicates the functional logic, the 'D' suffix denotes the SO20 package and 'PW' denotes TSSOP20. The specific 'ADB' designation identifies the SSOP20 package variant. All variants share identical electrical characteristics but differ in physical footprint dimensions.

Replacement Considerations

74LVC623AD,118

FAQ

How does the device handle data storage?

Data storage is achieved by simultaneously enabling both OEAB and OEBA inputs. In this configuration, each output reinforces its corresponding input, maintaining the last state of the bus lines when all other data sources are in a high-impedance OFF-state.

What is the function of the dual enable inputs?

The OEAB and OEBA inputs allow maximum flexibility in timing. They control whether data flows from An to Bn, from Bn to An, or if the device is disabled to effectively isolate the two sets of bus lines.