74LVCH2T45GF,115

Translators, Level Shifters Overview

The Nexperia 74LVCH2T45GF,115 is a dual-bit translating transceiver with 3-state outputs. It operates on two independent supplies, VCC(A) and VCC(B), both ranging from 1.2 V to 5.5 V. The device facilitates bidirectional level translation between low voltage nodes such as 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V. Port A pins (nA, DIR) reference VCC(A), while port B pins (nB) reference VCC(B). Direction control is managed via the DIR input. The component supports partial power-down applications using IOFF circuitry and includes active bus hold functionality for unused inputs.

Translators, Level Shifters Feature Summary

• Active bus hold circuitry maintains valid logic levels for floating or unused data inputs.
• IOFF circuitry disables outputs to prevent damaging backflow current during partial power-down.
• Suspend mode activates when either supply reaches GND, placing ports in high-impedance OFF-state.
• Inputs accept voltages up to 5.5 V, providing overvoltage tolerance.

Translators, Level Shifters Applications

• Bidirectional level translation between mixed voltage domains
• Partial power-down system management
• Low voltage node interfacing

Translators, Level Shifters Procurement Notes

Verify the specific GF package designation (SOT1089) against schematic footprints, as it differs dimensionally from other XSON8 variants like GT or GN. Confirm that the LVCH series bus hold feature is required for the design, distinguishing it from the standard LVC version. Ensure supply rails remain within the 1.2 V to 5.5 V range to maintain specified electrical characteristics.

Translators, Level Shifters Selection Notes

Select this component when bidirectional translation between arbitrary low-voltage nodes is required within a single package. The LVCH variant is preferred over LVC if active bus hold is necessary to eliminate external pull-up resistors. Verify thermal derating requirements for the SOT1089 package, which derates linearly above 88 °C. Ensure the DIR pin logic aligns with the desired transmission direction relative to VCC(A).

Translators, Level Shifters Part Context

This device belongs to the 74LVCH2T45 family of dual supply translating transceivers manufactured by Nexperia. It shares functional similarities with the 74LVC2T45 but adds active bus hold features. The GF suffix indicates an extremely thin small outline package (XSON8) with dimensions of 1.35 x 1 x 0.5 mm, offering a compact solution for space-constrained PCB layouts compared to larger packages like VSSOP8.

Translators, Level Shifters Replacement Considerations

74LVCH2T45GT,115

Translators, Level Shifters FAQ

How does the device handle power-down conditions?

The device utilizes IOFF circuitry to disable outputs, preventing damaging backflow current when powered down. If either VCC(A) or VCC(B) is at GND, the device enters suspend mode with both ports in a high-impedance state.

What is the function of the DIR pin?

The DIR pin controls the direction of data transmission. A HIGH level allows transmission from nA to nB, while a LOW level allows transmission from nB to nA. Pins nA and DIR are referenced to VCC(A).