Texas Instruments 74AC11074NSRE4

Overview

74AC11074NSRE4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent asynchronous preset and clear inputs, operating from 3 V to 5.5 V, featuring 125 MHz max clock frequency at 5 V, 7.5 ns typical propagation delay (CLK→Q), and ±24 mA output drive. It is used in synchronous logic control, state machine sequencing, and data latching in industrial digital systems.

For engineers reviewing the 74AC11074NSRE4 datasheet, 74AC11074NSRE4 pinout, 74AC11074NSRE4 application, or 74AC11074NSRE4 equivalent, key selection criteria include guaranteed setup/hold timing (tsu = 3.5 ns, th = 0 ns at 5 V), rail-to-rail input voltage tolerance (–0.5 V to VCC + 0.5 V), latch-up immunity (500 mA at 125°C), and compatibility with 3.3 V/5 V mixed-signal interfaces.

Technical Context

This device implements two independent edge-triggered storage elements using TI's EPIC™ 1-µm CMOS process, enabling high-speed switching with minimized noise via center-pin VCC/GND configuration. Each flip-flop supports asynchronous active-low PRE and CLR, synchronous D-to-Q transfer on CLK rising edge, and non-overlapping control priority where PRE/CLR override clocked operation.

Timing behavior is voltage-dependent: at VCC = 5 V, it achieves 125 MHz maximum clock frequency and 7.5 ns typical tPLH/tPHL; at VCC = 3.3 V, fmax drops to 100 MHz and propagation delay increases to 10.5 ns. The function table confirms metastability avoidance for PRE=CLR=L (nonstable H/H output) and strict hold-time zero requirement post-clock edge.

Key Specifications

Pinout & Package

74AC11074NSRE4 is packaged in a 14-pin plastic small-outline (SOIC) package (N suffix), with center-pin VCC (pin 14) and GND (pin 7) layout optimized for low-inductance power delivery and reduced switching noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AC74N and 74LVC74AD, the 74AC11074NSRE4 uniquely combines 5 V tolerance, center-pin noise suppression, and 125 MHz capability-making it optimal for industrial upgrades requiring drop-in reliability without layout revision.

Availability

74AC11074NSRE4 is available at Aetrix Electronics and suitable for industrial PLCs, automated test equipment, legacy bus interfaces, and motor control sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AC11074NSRE4 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 founded in 1930, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74AC logic family was engineered for high-speed, low-power, TTL-compatible CMOS operation in industrial control and instrumentation systems-prioritizing noise immunity, wide supply range, and robust latch-up performance.

FAQ

What is the maximum clock frequency supported by the 74AC11074NSRE4?

The 74AC11074NSRE4 supports up to 125 MHz maximum clock frequency when operated at VCC = 5 V and TA = 25°C. At VCC = 3.3 V, the maximum frequency reduces to 100 MHz. These values are specified under recommended operating conditions and assume proper load capacitance (CL = 50 pF) and signal integrity per Figure 1 in the datasheet. The 74AC11074NSRE4 achieves this performance using TI's EPIC™ 1-µm CMOS process and center-pin power/ground layout.

Does the 74AC11074NSRE4 support 3.3 V and 5 V logic levels simultaneously?

No, the 74AC11074NSRE4 operates from a single supply (3 V to 5.5 V) and is fully 5 V tolerant, meaning it accepts 3.3 V or 5 V input signals safely within its VIH/VIL thresholds. However, all I/O swings are referenced to the same VCC rail-so it does not perform bidirectional level translation. For true 3.3 V ↔ 5 V translation, external buffers or dedicated level-shifters are required alongside the 74AC11074NSRE4.

What is the purpose of the center-pin VCC and GND configuration in the 74AC11074NSRE4 package?

Center-pin VCC (pin 14) and GND (pin 7) in the 74AC11074NSRE4's SOIC-N package reduce simultaneous switching output noise and improve high-speed signal integrity by minimizing power/ground loop inductance. This layout lowers ground bounce and supply droop during fast edge transitions-critical for maintaining timing margins above 50 MHz. The 74AC11074NSRE4 leverages this mechanical feature to achieve its rated 125 MHz operation without added decoupling complexity.

Can the 74AC11074NSRE4 be used in safety-critical motor control applications?

The 74AC11074NSRE4 is not certified for safety-critical functions such as life-support or fail-safe motor shutdown. While it offers 500 mA latch-up immunity and –40°C to +85°C operation, Texas Instruments explicitly excludes liability for use in critical applications. For motor control, the 74AC11074NSRE4 may serve in non-safety-related state sequencing-but functional safety must be implemented externally via redundant hardware or ASIL-compliant controllers.

How does the 74AC11074NSRE4 handle conflicting PRE and CLR assertions?

When both PRE and CLR are low (L), the 74AC11074NSRE4 enters a nonstable state: outputs Q and Q both go high (H), violating complementary logic. This condition does not persist-upon release of either PRE or CLR, the flip-flop resolves to the state dictated by the remaining active control. The 74AC11074NSRE4 datasheet explicitly warns against holding both low, as it creates undefined metastability during transition back to valid operation.