74LVC8T245DBQRG4

Overview

The SN74LVC8T245DBQRG4 is an eight-bit non-inverting bus transceiver featuring configurable dual power supply rails for bidirectional voltage level translation. It supports VCCA and VCCB operating within a range of 1.65V to 5.5V, enabling universal low-voltage translation between 1.8V, 2.5V, 3.3V, and 5V nodes. The device provides three-state outputs controlled by DIR and OE inputs referenced to VCCA. It operates from -40°C to 85°C in a 24-pin SSOP package.

Feature Summary

• Fully configurable dual-rail design allows each port to operate over the full 1.65V to 5.5V power-supply range
• Robust, glitch-free power supply sequencing enables either supply rail to be powered on or off in any order
• Ioff circuitry supports partial-power-down mode operation by disabling outputs to prevent damaging current backflow
• VCC isolation feature disables all I/O outputs when either VCC input is below 100mV or left floating

Applications

• Personal electronics: sound bar, flat-panel monitor
• Industrial: PLC controller, CNC controller, ultrasound scanner
• Enterprise computing and network attached storage
• Telecom: data center switch, baseband unit

Procurement Notes

Verify the specific DBQR suffix indicates the SSOP-24 package variant. Confirm the G4 suffix aligns with RoHS compliance requirements. Ensure the application environment remains within the specified -40°C to 85°C temperature range. Validate that both VCCA and VCCB supplies are maintained within the 1.65V to 5.5V limits during operation.

Selection Notes

Select this component for asynchronous communication requiring bidirectional translation between different logic voltage levels. It is suitable for systems needing robust power sequencing without glitches. Consider the SSOP-24 package dimensions for PCB layout constraints. Ensure unused I/O pins are tied to logic HIGH or LOW to minimize power consumption.

Part Context

This part belongs to the SN74LVC8T245 series of 8-bit dual-supply bus transceivers. The family includes variants with different packages such as TSSOP, TVSOP, and VQFN. All variants share the core functionality of configurable voltage translation and three-state outputs while differing in physical footprint and thermal characteristics.

Replacement Considerations

SN74LVC8T245DBR (Standard SSOP-24)

FAQ

How does the device handle power supply sequencing?

The device features glitch-free power supply sequencing, allowing either VCCA or VCCB to be powered on or off in any order without producing glitches on the I/Os.

What happens if one supply voltage drops below 100mV?

If either VCC input is below 100mV or left floating, all I/O outputs are disabled and enter a high-impedance state to prevent current backflow.