Texas Instruments 74AUC2G240DCURG4

Overview

74AUC2G240DCURG4 from Texas Instruments is a dual 1-bit noninverting buffer/driver with independent 3-state outputs, designed for sub-1.8-V bus interface applications. It operates from 0.8 V to 2.7 V, delivers ±8 mA output drive at 1.65 V, achieves 1.8 ns max propagation delay at 1.8 V, and features Ioff partial-power-down support. It is used in low-voltage memory address buffering and clock distribution in portable embedded systems.

For engineers reviewing the 74AUC2G240DCURG4 datasheet, 74AUC2G240DCURG4 pinout, 74AUC2G240DCURG4 application, or 74AUC2G240DCURG4 equivalent, key selection criteria include its 1.8-V optimized timing, 3-state bus contention control, NanoFree™-compatible VSSOP-8 footprint, and Ioff-enabled mixed-voltage system interoperability.

Technical Context

This device implements two independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Its logic function follows a standard 3-state truth table: when OE is low, Y = A; when OE is high, Y = high-impedance. The architecture supports simultaneous bus driving and isolation without external pull-ups.

Designed for 1.65–1.95 V nominal operation, it maintains full functionality down to 0.8 V and tolerates 3.6-V I/O-enabling safe interfacing between 1.8-V logic and legacy 3.3-V subsystems. The Ioff circuitry actively disables outputs during power-down, preventing backflow current across powered-off rails.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.3 mm × 2.0 mm body, 0.5-mm lead pitch, 0.9-mm max height, exposed thermal pad not present, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G240DCUR and 74AUP2G240DCUR, the 74AUC2G240DCURG4 uniquely balances sub-1-V operation, 1.8 ns speed, and ±8-mA drive - making it optimal for 1.8-V memory and clock paths where both timing density and voltage flexibility matter.

Availability

74AUC2G240DCURG4 is available at Aetrix Electronics and suitable for memory address buffering, low-voltage clock distribution, and mixed-voltage system interface applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74AUC2G240DCURG4 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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The AUC family targets sub-1-V and 1.8-V logic applications, emphasizing speed-power optimization for portable and battery-constrained systems where nanosecond timing and microamp quiescence coexist.

FAQ

What is the minimum supply voltage at which 74AUC2G240DCURG4 guarantees functional operation?

The 74AUC2G240DCURG4 is fully specified from 0.8 V to 2.7 V, with guaranteed operation-including propagation delay, drive strength, and logic thresholds-at 0.8 V. This sub-1-V capability is confirmed in the Recommended Operating Conditions table of the SCES534C datasheet, enabling use with emerging ultra-low-power MCUs and energy-harvesting sources. The 74AUC2G240DCURG4 maintains valid high/low output states and 3-state control across this entire range.

Does 74AUC2G240DCURG4 support hot-swap or partial-power-down modes?

Yes, the 74AUC2G240DCURG4 includes Ioff circuitry that disables all outputs when VCC = 0 V, preventing damaging current backflow from live I/O pins into a powered-down supply rail. This feature is explicitly documented in the Features and Electrical Characteristics sections of the datasheet, and is validated per JESD 78 Class II latch-up testing. The 74AUC2G240DCURG4 thus supports safe hot-plug operation in modular systems.

Can 74AUC2G240DCURG4 safely interface a 1.8-V microcontroller with a 3.3-V EEPROM?

Yes-the 74AUC2G240DCURG4 has 3.6-V I/O tolerance, meaning its inputs and outputs withstand up to 3.6 V regardless of VCC level. When powered at 1.8 V, it can accept 3.3-V signals from the EEPROM and drive 3.3-V logic-high levels (VOH ≥ 2.4 V at IOL = –8 mA) without damage or level-shifting components. This capability is verified in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the SCES534C datasheet.

What is the recommended power-supply decoupling for 74AUC2G240DCURG4 in high-speed designs?

Texas Instruments recommends placing a 0.1-µF X7R ceramic capacitor between VCC (Pin 8) and GND (Pins 4/5), located ≤2 mm from the device, with short, low-inductance traces. This is specified in the Layout Guidelines section of the SCES534C datasheet and validated in TI's board layout examples. For systems with multiple 74AUC2G240DCURG4 devices, add a bulk 4.7-µF tantalum capacitor per 5–10 ICs on the same VCC rail to suppress low-frequency ripple.

How does the pinout of 74AUC2G240DCURG4 differ from the DCT and YZP package variants?

The 74AUC2G240DCURG4 uses the DCU (VSSOP-8) package with identical logical pinout to the DCT (SSOP-8) variant: Pin 1 = 1A, Pin 2 = 1OE, Pin 3 = 2Y, Pin 4 = GND, Pin 5 = GND, Pin 6 = 2A, Pin 7 = 2OE, Pin 8 = VCC. The YZP (NanoFree™ WCSP) variant uses bottom-side bumps with mirrored layout but same signal mapping-confirmed in TI's mechanical drawings SCES534C Figure 1 and Package Outline DCU0008A. No redesign is needed when migrating between DCU and DCT footprints.