Texas Instruments SN74AUC1G74DCURE4

Overview

SN74AUC1G74DCURE4 from Texas Instruments is a single positive-edge-triggered D-type flip-flop with asynchronous clear (CLR) and preset (PRE), designed for ultra-low-voltage operation at 1.65–1.95 V VCC. It delivers ±8-mA output drive at 1.8 V, achieves 1.5 ns max propagation delay (tpd), supports Ioff partial-power-down mode, and operates across –40°C to 85°C. It serves as a compact, high-speed storage element in voltage-scalable digital interfaces and clock-domain synchronization circuits.

For engineers reviewing the SN74AUC1G74DCURE4 datasheet, SN74AUC1G74DCURE4 pinout, SN74AUC1G74DCURE4 application, or SN74AUC1G74DCURE4 equivalent, key selection considerations include its 1.8-V optimized timing performance, sub-1-V operational capability, Ioff-enabled power sequencing support, and compatibility with mixed-mode signal environments requiring 3.6-V I/O tolerance.

Technical Context

This device implements a synchronous edge-triggered storage cell with priority-encoded asynchronous control: CLR overrides PRE when both are asserted low. Its internal logic ensures data transfer on the rising edge of CLK only when both PRE and CLR are high, with setup/hold times as low as 0.4 ns at 2.5 V. The flip-flop maintains defined Q/Q outputs under all input conditions per its function table.

Designed for nanoscale CMOS processes, it features rail-to-rail output swing, sub-10-μA quiescent ICC, and robust ESD protection (2000-V HBM). Its Ioff circuitry actively disables outputs during power-down, preventing backflow current - critical for hot-swap and multi-rail system designs.

Key Specifications

Pinout & Package

VSSOP (DCU) package: 8-pin, 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 D-type flip-flop applications.

Compared with SN74LVC1G74DCUR and 74AUP1G74GW,125, the SN74AUC1G74DCURE4 uniquely balances sub-1-V operability, 250+ MHz fmax at 1.8 V, and 3.6-V I/O tolerance - making it the optimal choice for compact, high-frequency, mixed-voltage digital glue logic where timing and voltage scalability are co-critical.

Availability

SN74AUC1G74DCURE4 is available at Aetrix Electronics and suitable for high-speed data synchronization, low-power sensor interface, and mixed-mode signal routing requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for SN74AUC1G74DCURE4 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-performance, low-power logic families.

The SN74AUC logic family targets ultra-high-speed, low-voltage digital interface applications - specifically engineered for 1.8-V systems demanding minimal propagation delay, rail-to-rail drive strength, and robust power-down behavior.

FAQ

What is the minimum supply voltage at which SN74AUC1G74DCURE4 guarantees functional operation?

SN74AUC1G74DCURE4 guarantees functional operation down to 0.8 V VCC across the full temperature range (–40°C to +85°C), with timing parameters specified from 0.8 V to 2.7 V. At 0.8 V, it achieves usable clock frequencies (>50 MHz) and maintains defined logic states, enabling deployment in emerging ultra-low-power domains such as energy-harvesting nodes and sub-threshold computing.

Does SN74AUC1G74DCURE4 support hot-swapping or partial power-down scenarios?

Yes, SN74AUC1G74DCURE4 includes Ioff circuitry that actively disables outputs when VCC = 0 V, preventing damaging current backflow from live I/O traces into the unpowered device. This feature is fully characterized per JEDEC JESD78 and enables safe use in hot-swap backplanes, modular systems with staggered power sequencing, and battery-backed subsystems where sections may be powered independently.

What is the pin configuration difference between SN74AUC1G74DCURE4 and SN74AUC1G74DCTR?

Both SN74AUC1G74DCURE4 (VSSOP/DCU) and SN74AUC1G74DCTR (SSOP/DCT) share identical 8-pin functional mapping: Pin 1 = CLR, Pin 2 = CLK, Pin 3 = D, Pin 4 = PRE, Pin 5 = GND, Pin 6 = Q, Pin 7 = Q, Pin 8 = VCC. However, DCU uses a 2.0 mm × 1.25 mm body with 0.5-mm pitch, while DCT uses a 3.0 mm × 2.2 mm body with 0.65-mm pitch - requiring distinct PCB footprints despite identical logic pinout.

Can SN74AUC1G74DCURE4 safely interface with 3.3-V logic signals?

Yes, SN74AUC1G74DCURE4 features 3.6-V I/O tolerance, meaning its inputs accept voltages up to 3.6 V regardless of VCC level - allowing direct connection to 3.3-V CMOS outputs without external level shifters. Its outputs swing rail-to-rail (0 V to VCC), so when powered at 1.8 V, they drive 1.8-V loads; interfacing with 3.3-V receivers requires external pull-up or translation if high-level recognition is needed.

How does the CLR and PRE priority logic work in SN74AUC1G74DCURE4?

In SN74AUC1G74DCURE4, CLR has priority over PRE: when both CLR and PRE are low, the output Q is forced low and Q high - overriding any preset action. This priority behavior is hardwired and deterministic, ensuring predictable reset dominance in safety-critical or fault-recovery sequences where unconditional clearing must take precedence over setting.