74LVQ245SJX

Overview

The onsemi 74LVQ245SJX is a low-voltage octal bidirectional transceiver featuring three-state outputs, designed for bus-oriented applications. 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 delay ranges from 2.0 ns to 15.0 ns depending on load conditions. It includes Transmit/Receive and Output Enable control inputs to manage data flow direction and high-impedance states.

Feature Summary

• Implements patented EMI reduction circuitry to minimize electromagnetic interference during operation.
• Features improved latch-up immunity and guaranteed incident wave switching into 75Ω transmission lines.
• Provides 4 kV minimum ESD immunity for enhanced robustness in sensitive environments.

Applications

• Bus-oriented applications requiring low power and low noise performance.
• 3.3V system architectures utilizing non-inverting bidirectional buffering.
• High-speed data transfer interfaces with controlled impedance transmission lines.

Procurement Notes

Verify the specific package variant against the ordering code. The 'SJ' suffix indicates a 20-Lead Small Outline Package (SOP) conforming to EIAJ TYPE II standards with a 5.3mm width. Confirm that the 'X' suffix denotes tape and reel packaging availability. Ensure compatibility with the recommended operating conditions of 2.0V to 3.6V supply voltage.

Selection Notes

Select this component for designs requiring octal bidirectional data transfer with three-state output control. It is suitable for systems needing 12 mA drive capability at both ports. Consider the propagation delay specifications when designing for high-frequency signal integrity. Ensure unused inputs are held HIGH or LOW to prevent floating states.

Part Context

This device belongs to the LVQ logic family, characterized by low voltage operation and specific EMI reduction features. It serves as a bidirectional buffer between buses, distinct from standard LVX or HCT families by its focus on simultaneous switching noise reduction and incident wave switching guarantees.

Replacement Considerations

Check datasheets for equivalent octal bus transceivers with 3.6V maximum ratings and similar SOP-20 footprints. Verify pinout compatibility for OE and T/R controls. Ensure replacement parts meet the 12 mA sink current requirement and operate within the -40°C to +85°C temperature range.

FAQ

How is the data flow direction controlled?

Data flow is determined by the Transmit/Receive (T/R) input. An active-HIGH state enables transmission from A ports to B ports, while an active-LOW state enables reception from B ports to A ports.

What happens when the Output Enable (OE) input is HIGH?

When the OE input is HIGH, both A and B ports are disabled and placed in a HIGH-Z (high impedance) condition, effectively isolating the bus.