74LVQ245SCX

Overview

The onsemi 74LVQ245SCX is a low voltage octal bidirectional transceiver featuring three-state outputs. It operates within a supply voltage range of 2.0V to 3.6V and supports an operating temperature from -40°C to +85°C. The device provides a current sinking capability of 12 mA at both A and B ports. Propagation delays are specified with maximum values of 15.0 ns at 2.7V and 10.5 ns at 3.3V under a 50 pF load. Quiescent supply current is limited to 40.0 µA maximum.

Feature Summary

• Implements patented EMI reduction circuitry for improved signal integrity
• Guarantees simultaneous switching noise levels and dynamic threshold performance
• Provides enhanced latch-up immunity exceeding standard requirements
• Ensures incident wave switching compatibility into 75Ω transmission lines

Applications

• Bus-oriented applications requiring two-way asynchronous communication
• Low power and low noise 3.3V system designs
• Data bus buffering with direction control via Transmit/Receive input
• Systems requiring isolation through the Output Enable pin

Procurement Notes

Verify the specific package variant, as the SCX suffix denotes the SOIC JEDEC package. Confirm that the component is sourced from authorized distributors to ensure authenticity, given the history of Fairchild Semiconductor assets being acquired by onsemi. Check for RoHS compliance status and verify that unused inputs are properly terminated in the final design to prevent floating states.

Selection Notes

Select this component when designing systems that require octal data transfer with strict EMI constraints. The LVQ series offers superior dynamic performance compared to standard LVX or LVC families. Ensure the application voltage remains within the 2.0V to 3.6V range. Consider the 12 mA drive strength for driving moderate capacitive loads without external buffers.

Part Context

This device belongs to the LVQ logic family, which is engineered specifically for low voltage applications with enhanced electromagnetic interference characteristics. Unlike standard low-voltage CMOS, the LVQ series incorporates specific circuitry to manage simultaneous switching noise. It serves as a direct replacement for older octal transceivers in modern 3.3V digital interfaces where signal integrity is critical.

Replacement Considerations

Direct functional equivalents include the MC74LVQ245 and variants from other manufacturers such as NXP or TI within the same LVQ or high-performance LVX categories. Verify pinout compatibility and electrical specifications, particularly propagation delay and output drive current, before substituting.