Texas Instruments SN74AUC2G79DCUR

Overview

SN74AUC2G79DCUR from Texas Instruments is a dual positive-edge-triggered D-type flip-flop in an 8-pin VSSOP (DCU) package, operating from 0.8 V to 2.7 V with 1.9 ns max propagation delay at 1.8 V, ±8-mA output drive, and Ioff support for partial power-down - used in low-voltage clock-domain synchronization and data latching in portable logic interfaces.

For engineers reviewing the SN74AUC2G79DCUR datasheet, SN74AUC2G79DCUR pinout, SN74AUC2G79DCUR application, or SN74AUC2G79DCUR equivalent, key selection criteria include sub-2 ns timing at 1.8 V, 10-µA max ICC, 3.6-V I/O tolerance for mixed-mode interfacing, and VSSOP footprint compatibility with space-constrained PCB layouts.

Technical Context

This device implements two independent D-type flip-flops, each triggered on the rising edge of its dedicated clock input (1CLK, 2CLK), with asynchronous data capture satisfying setup/hold times as low as 0.5 ns (t_su) and 0.1 ns (t_h) at 1.8 V. Its logic operates across 0.8–2.7 V, but is optimized for 1.65–1.95 V supply rails.

The SN74AUC2G79DCUR integrates Ioff circuitry that disables outputs during power-down, preventing backflow current when VCC = 0 V, and supports 3.6-V tolerant I/O even at 0.8-V VCC - enabling robust level-shifting between legacy and ultra-low-voltage domains without external translators.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.0 mm × 1.25 mm body, 0.5-mm lead pitch, 0.9-mm max height, exposed 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 D-type flip-flop applications.

Compared with SN74LVC2G74DCUR and 74AUP2G79GS,115, the SN74AUC2G79DCUR delivers the lowest propagation delay and widest voltage range among VSSOP-packaged dual DFFs, making it optimal for timing-critical, battery-constrained designs requiring sub-1-V compatibility and Ioff safety.

Availability

SN74AUC2G79DCUR is available at Aetrix Electronics and suitable for mobile baseband interfaces, low-power sensor hubs, portable display timing control, and configurable logic glue in wearable SoMs requiring stable component supply across extended production lifecycles.

Supply support for SN74AUC2G79DCUR 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 specializing in analog, embedded processing, and logic solutions, with decades of expertise in high-speed, low-power interface ICs.

The SN74AUC2G79DCUR belongs to TI's AUC logic family - engineered for ultra-high-speed, ultra-low-voltage operation in portable and battery-powered systems where timing precision and power efficiency are co-critical.

FAQ

What is the minimum supply voltage required for functional operation of the SN74AUC2G79DCUR?

The SN74AUC2G79DCUR operates down to 0.8 V VCC across the full –40°C to 85°C temperature range, with guaranteed timing and logic functionality per the datasheet's recommended operating conditions. At 0.8 V, parameters including tpd, t_su, and output drive are characterized, making SN74AUC2G79DCUR suitable for single-cell lithium or thin-film battery applications where other logic families fail.

Does the SN74AUC2G79DCUR support hot-swap or partial power-down scenarios?

Yes, the SN74AUC2G79DCUR features Ioff circuitry that actively disables outputs when VCC = 0 V, preventing damaging back-current flow from live I/O lines into the unpowered device. This capability is explicitly validated per JESD 78 Class II latch-up testing and enables safe use in modular systems with staggered power sequencing or field-replaceable units.

Can the SN74AUC2G79DCUR interface directly with 3.3-V logic without level shifters?

Yes, the SN74AUC2G79DCUR supports 3.6-V tolerant I/O - meaning inputs and outputs can safely handle up to 3.6 V regardless of VCC setting (0.8–2.7 V). This allows direct connection to 3.3-V peripherals such as microcontrollers, sensors, or FPGAs without external level translation, simplifying design and reducing component count.

What is the maximum clock frequency supported by the SN74AUC2G79DCUR at 1.8 V?

At VCC = 1.8 V and CL = 15 pF, the SN74AUC2G79DCUR supports a maximum clock frequency (f_max) of 250 MHz, with typical propagation delay (t_pd) of 1.9 ns. This is confirmed in the switching characteristics table under "Timing Requirements" and verified across process corners and temperature extremes per TI's production test flow.

Is the SN74AUC2G79DCUR pin-compatible with other members of the SN74AUC2Gxx family?

No - the SN74AUC2G79DCUR has a unique pinout specific to its dual D-type flip-flop function. While other SN74AUC2Gxx devices (e.g., SN74AUC2G86, SN74AUC2G08) share the same VSSOP-8 (DCU) package outline, their pin assignments differ significantly (e.g., gate inputs vs. clock/data terminals). Board-level substitution requires schematic and layout verification, not mechanical compatibility alone.