Texas Instruments 74AUC2G240DCURE4

Overview

74AUC2G240DCURE4 from Texas Instruments is a dual 1-bit noninverting buffer/driver with independent 3-state outputs, designed for 1.65-V to 1.95-V operation. It delivers ±8-mA output drive at 1.8 V, achieves 1.8-ns max propagation delay, consumes only 10 µA ICC, and supports partial-power-down via Ioff. It is used in low-voltage memory address drivers, clock distribution, and bus transceivers.

For engineers reviewing the 74AUC2G240DCURE4 datasheet, 74AUC2G240DCURE4 pinout, 74AUC2G240DCURE4 application, or 74AUC2G240DCURE4 equivalent, key selection factors include sub-1-V operability, 3.6-V I/O tolerance for mixed-mode interfacing, NanoFree™ package footprint, and guaranteed 3-state behavior during power sequencing.

Technical Context

This device implements two independent noninverting buffers, each with dedicated output-enable (OE) control. Each buffer passes A→Y when OE is low; outputs enter high-impedance state when OE is high. The logic diagram confirms positive-logic enable and no internal inversion.

It features Ioff circuitry that disables outputs during partial power-down, preventing backflow current when VCC = 0 V while inputs remain biased. Absolute maximum ratings allow VI/VO up to 3.6 V regardless of VCC, enabling robust level-shifting between 1.8-V and 3.3-V domains.

Key Specifications

Pinout & Package

The 74AUC2G240DCURE4 uses the US8 (DCU) package: 1.5-mm × 1.5-mm, 0.5-mm pitch, 8-pin ultra-thin VSSOP with exposed pad. Pin 1 is marked by a beveled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 3-state buffer applications.

Compared with SN74LVC2G240DCUR and 74AUP2G240DCURE4, the 74AUC2G240DCURE4 uniquely balances sub-2-ns speed, 10-µA quiescent current, and die-size packaging-making it optimal for space-constrained, battery-operated systems requiring both performance and efficiency.

Availability

74AUC2G240DCURE4 is available at Aetrix Electronics and suitable for memory address buffering, low-voltage clock distribution, and mixed-voltage bus interfacing requiring stable component supply across industrial and portable electronics programs.

Supply support for 74AUC2G240DCURE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.

The 74AUC2G240DCURE4 belongs to TI's AUC sub-1-V Little Logic family, engineered specifically to replace discrete logic in ultra-low-voltage, high-density portable systems where power, speed, and footprint are co-constrained.

FAQ

What is the recommended pull-up resistor value for 1OE and 2OE on the 74AUC2G240DCURE4 during power-up?

The 74AUC2G240DCURE4 datasheet specifies that OE pins should be tied to VCC through a pull-up resistor to guarantee high-impedance state at power-on. Minimum resistor value depends on the driver's current-sinking capability; for standard 1.8-V operation with ≤100-µA leakage, a 10-kΩ resistor is typical. Larger values (e.g., 100 kΩ) are acceptable if board-level noise immunity permits, but must ensure OE remains below VIH threshold during full VCC ramp.

Does the 74AUC2G240DCURE4 support true bidirectional data flow like a transceiver?

No, the 74AUC2G240DCURE4 is a unidirectional dual buffer-not a transceiver. Each channel (1A→1Y and 2A→2Y) operates strictly in one direction. While its 3-state outputs allow shared bus use, external control logic is required to manage direction; the device itself has no built-in direction pin or automatic sensing.

Can the 74AUC2G240DCURE4 be operated with VCC = 0.9 V, and what performance trade-offs apply?

Yes, the 74AUC2G240DCURE4 is fully specified from 0.8 V to 2.7 V. At VCC = 0.9 V, VOH drops to ~0.7 V and VOL rises to ~0.25 V per electrical characteristics table, reducing noise margin. Propagation delay increases to ~4.5 ns (CL = 15 pF), and output drive falls to ±0.7 mA-sufficient for low-capacitance local routing but not for driving long traces or multiple loads.

Is the 74AUC2G240DCURE4 pin-compatible with other 8-pin VSSOP logic devices such as the SN74LVC1G125?

No, the 74AUC2G240DCURE4 is not pin-compatible with SN74LVC1G125 or other single-channel buffers. Its DCU package pinout (1OE, 1A, 2Y, GND, 2A, 1Y, 2OE, VCC) is unique to the dual 3-state buffer function. Swapping packages without verifying pin mapping risks incorrect enable logic, shorted outputs, or undefined states.

How does the Ioff feature of the 74AUC2G240DCURE4 protect downstream circuitry during partial power-down?

The Ioff feature in the 74AUC2G240DCURE4 actively disables output FETs when VCC = 0 V, limiting input/output leakage to ±10 µA even if external signals (up to 3.6 V) are present. This prevents reverse current flow into a powered-down supply rail-critical for hot-swap architectures and multi-rail systems where subsystems power up/down independently.