MC74LVX245DWR2G

Overview

The MC74LVX245DWR2G is an octal bus transceiver manufactured by onsemi, designed for two-way asynchronous communication between data buses. It operates within a supply voltage range of 2.0 V to 3.6 V and features 5 V-tolerant inputs. The device utilizes advanced high-speed CMOS technology, providing balanced propagation delays with typical values of 4.7 ns at 3.3 V. It includes power-down protection on inputs and offers low noise performance with a maximum dynamic VOL of 0.8 V. The component is housed in a 20-lead SOIC package.

Feature Summary

• Provides bidirectional data transmission controlled by the T/R input signal level.
• Features 5 V-tolerant inputs allowing direct interfacing with 5 V systems.
• Includes output enable functionality to isolate buses when disabled.
• Offers robust ESD protection exceeding 2000 V via Human Body Model.

Applications

• Two-way asynchronous communication between data buses
• Memory interface applications requiring bidirectional data transfer
• Systems utilizing 5 V-tolerant logic levels

Procurement Notes

Verify the specific ordering suffix 'DW' corresponds to the SOIC-20 Wide body package as documented. Confirm RoHS compliance status and Pb-Free designation matches current manufacturing standards. Ensure moisture sensitivity level requirements are met for storage and handling procedures during assembly.

Selection Notes

Select this component for designs requiring octal bidirectional data transfer with 5 V tolerance. Consider the 2.0 V to 3.6 V operating voltage range against system power rails. Evaluate the 20-lead SOIC package dimensions for PCB layout compatibility. Verify that the 5 V tolerant input capability aligns with upstream logic levels.

Part Context

This part belongs to the LVX series of logic integrated circuits from onsemi. It functions as an octal bus transceiver within the standard logic IC category. The device is pin and function compatible with other standard logic families, facilitating design reuse across different platform architectures.

Replacement Considerations

Check for alternative packages such as TSSOP-20 (MC74LVX245DTR2G) if space constraints require a smaller footprint. Verify functional equivalence with other octal bus transceivers offering similar voltage tolerances and speed characteristics.

FAQ

Can the MC74LVX245 be used to directly interface 5.0 V to 3.0 V systems?

No, a parasitic diode is formed between the bus and VCC terminals, preventing direct interface between 5.0 V and 3.0 V systems.

What happens if inputs are left floating?

All floating or high impedance input or I/O pins must be fixed by means of pullup or pulldown resistors or bus terminator ICs to ensure proper operation.

How is the direction of data transmission determined?

The direction is determined by the logic level of the T/R input; Low enables B to A transmission, while High enables A to B transmission.