74AVC1T45DCKR

Overview

The SN74AVC1T45DCKR is a single-bit dual-supply bus transceiver in a 6-pin SC-70 package. It supports configurable voltage translation between VCCA and VCCB rails ranging from 1.2V to 3.6V. The device provides 3-state outputs with ±12mA drive capability at 3.3V. I/Os are 4.6V tolerant, and the DIR input is referenced to VCCA. Operating temperature spans -40°C to +85°C.

Feature Summary

• Fully configurable dual-rail design allows independent power supply selection for each port across the full 1.2V to 3.6V range.
• Ioff circuitry disables outputs to prevent damaging backflow current during partial-power-down mode operations.
• VCC isolation feature ensures both ports enter a high-impedance state if either VCC input is grounded.
• NanoFree package technology utilizes the die as the package for compact footprint requirements.

Applications

• Personal electronic devices
• Industrial systems
• Enterprise infrastructure
• Telecommunications equipment

Procurement Notes

Verify the specific DCK (SC-70) package designation matches the required PCB footprint. Confirm that the 1.2V to 3.6V operating range aligns with system power rails. Ensure ESD handling procedures meet JESD standards due to the exposed die NanoFree construction. Validate DIR input logic levels against the VCCA supply voltage.

Selection Notes

Select this component when bidirectional level shifting between low-voltage nodes (1.2V, 1.5V, 1.8V, 2.5V, 3.3V) is required. The dual-supply architecture enables flexible interface compatibility. Consider the 4.6V tolerance for interfacing with higher voltage signals without external protection. The absence of an OE pin requires careful direction control management to avoid bus contention.

Part Context

This part belongs to the SN74AVC1T45 family of single-bit bus transceivers. It shares functional characteristics with variants like the DBVR and DRL packages but differs in physical dimensions. The DCK suffix specifically denotes the SC-70 (SOT-SC70) surface-mount package configuration.

Replacement Considerations

SN74AVC1T45DBVR

FAQ

How does the VCC isolation feature function?

If either VCCA or VCCB input is at GND, the device forces both ports into a high-impedance state to protect the circuit.

What is the purpose of the Ioff feature?

Ioff supports partial-power-down mode by disabling output circuits to prevent excessive current backflow when the device is powered down.