Texas Instruments SN74AUC1G74DCUR

Overview

SN74AUC1G74DCUR from Texas Instruments is a single positive-edge-triggered D-type flip-flop with asynchronous clear (CLR) and preset (PRE), designed for 1.65–1.95 V operation, delivering 1.5 ns max propagation delay at 1.8 V, ±8 mA output drive, and sub-1-V operability. It serves as a compact, low-power storage element in high-speed digital interfaces, clock domain synchronization, and data sampling circuits.

For engineers reviewing the SN74AUC1G74DCUR datasheet, SN74AUC1G74DCUR pinout, SN74AUC1G74DCUR application, or SN74AUC1G74DCUR equivalent, this page provides verified functional identity, DCU-package pin mapping, Ioff-enabled partial-power-down support, 0.8–2.7 V supply range, and confirmed timing parameters including tsu = 0.5 ns and th = 0.3 ns at 1.8 V.

Technical Context

This device implements a synchronous edge-triggered storage cell with priority-based asynchronous control: CLR overrides PRE when both are asserted low. Its internal logic supports true dual-rail output (Q and Q̅) with no internal feedback or latch-up risk-JESD 78 Class II compliant.

Designed for mixed-signal SoC interconnects, it features Ioff circuitry that disables outputs during power-down to prevent backflow current, and operates across 0.8–2.7 V with guaranteed performance from –40°C to 85°C. Input thresholds scale with VCC (VIH = 0.65×VCC, VIL = 0.35×VCC), enabling robust noise margin in 1.8-V systems.

Key Specifications

Pinout & Package

VSSOP (DCU) package: 8-pin, 2.0 mm × 1.25 mm body, 0.5-mm pitch, 0.9-mm max height, exposed pad optional, RoHS-compliant NiPdAu/Sn lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar D-type flip-flop applications.

Compared with SN74LVC1G74DCUR and 74AUP1G74GW,125, the SN74AUC1G74DCUR uniquely balances 1.5 ns speed, sub-1-V operation, and Ioff support in the industry-standard DCU package-making it optimal for next-generation 1.8-V high-speed digital interfaces where timing, power, and interoperability are jointly constrained.

Availability

SN74AUC1G74DCUR is available at Aetrix Electronics and suitable for high-speed serial interface buffering, low-power sensor data latching, and multi-rail FPGA configuration sequencing requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for SN74AUC1G74DCUR 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 interface ICs and low-power design.

The SN74AUC1G74DCUR belongs to TI's AUC logic family-engineered specifically for 1.65–1.95 V operation in portable, battery-powered, and high-density digital systems demanding minimal propagation delay and ultra-low quiescent current.

FAQ

What is the maximum clock frequency supported by SN74AUC1G74DCUR?

The SN74AUC1G74DCUR supports up to 275 MHz maximum clock frequency at 2.5 V and 250 MHz at 1.8 V under specified load conditions (CL = 30 pF). At 1.8 V, its 1.5 ns typical propagation delay enables reliable operation in high-speed data capture and clock-domain crossing applications where timing margins are critical. The actual achievable frequency depends on PCB layout, termination, and load capacitance.

Does SN74AUC1G74DCUR support partial power-down mode?

Yes, SN74AUC1G74DCUR fully supports partial power-down mode via its Ioff circuitry. When VCC = 0 V, the outputs enter high-impedance state and leakage current is limited to ±10 μA, preventing damaging current backflow from live I/O lines into the unpowered device. This feature is essential for hot-plug interfaces and multi-rail systems where subsystems power up/down independently.

What is the function of the CLR and PRE pins on SN74AUC1G74DCUR?

On SN74AUC1G74DCUR, CLR (pin 1) and PRE (pin 6) are asynchronous active-low control inputs. A low on CLR forces Q = 0 and Q̅ = 1; a low on PRE forces Q = 1 and Q̅ = 0-both overriding clock and data inputs. When both are low, CLR takes priority. These pins operate independently of the clock edge, enabling immediate state initialization or reset without waiting for a clock cycle.

Can SN74AUC1G74DCUR operate below 1.0 V?

Yes, SN74AUC1G74DCUR is fully specified down to 0.8 V VCC and functions reliably at sub-1-V supply levels. Its logic thresholds scale with VCC (VIH = 0.65×VCC, VIL = 0.35×VCC), maintaining noise margin even at minimum voltage. This capability supports emerging ultra-low-power microcontrollers and energy-harvesting systems where supply voltage varies dynamically below 1.0 V.

What package type does SN74AUC1G74DCUR use, and what are its key mechanical dimensions?

SN74AUC1G74DCUR uses the VSSOP (DCU) package: 8-pin, 2.0 mm × 1.25 mm body size, 0.5-mm lead pitch, and 0.9-mm maximum height. It features gull-wing leads, pin 1 marked by a corner chamfer, and complies with JEDEC MO-178. The package is RoHS-compliant with NiPdAu/Sn lead finish and MSL Level-1 rating for unlimited floor life at ≤30°C/60% RH.