Texas Instruments 74AC11112D

Overview

74AC11112 from Texas Instruments is a dual J-K negative-edge-triggered flip-flop IC with independent preset (PRE) and clear (CLR) inputs, 70 MHz max clock frequency at 5 V, ±24 mA output drive, and operation from −40°C to 85°C. It performs toggle, set, reset, and data latch functions in synchronous logic control circuits for industrial timing and state-machine applications.

For engineers reviewing the 74AC11112 datasheet, 74AC11112 pinout, 74AC11112 application, or 74AC11112 equivalent, this device supports high-speed edge-triggered storage with guaranteed setup/hold times (3.5 ns / 1 ns at 5 V), low-noise center-pin VCC/GND layout, and EPIC™ 1-µm CMOS process reliability.

Technical Context

This device implements two fully independent J-K flip-flops sharing no internal signal paths. Each flip-flop triggers on the negative-going edge of CLK, with asynchronous PRE and CLR overriding clocked behavior when asserted low. Clock triggering is voltage-level–based-not dependent on fall time-enabling robust operation across varying edge rates.

Operation uses true complementary outputs (Q and Q) per channel, supports toggle mode via tied-high J/K inputs, and maintains output stability during input changes after hold time. The EPIC™ process delivers 500-mA latch-up immunity and >2000-V ESD protection per MIL-STD-883C Method 3015.

Key Specifications

Pinout & Package

74AC11112 is supplied in a 16-pin plastic small-outline (SOIC) package (D package), with center-pin VCC (pin 14) and GND (pin 7) configuration to minimize high-speed switching noise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar J-K flip-flop applications.

Compared with 74AC11112, the 74ACT11112 offers stronger TTL interface compatibility but higher static current, while the SN74HC112N trades speed and drive strength for broader supply flexibility and lower power-making each suitable for distinct voltage, noise, and performance boundaries.

Availability

74AC11112 is available at Aetrix Electronics and suitable for industrial automation, test equipment, communications infrastructure, and legacy bus interface designs requiring stable component supply and long-term obsolescence mitigation.

Supply support for 74AC11112 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 logic solutions for industrial, automotive, and communications markets.

The 74AC11112 belongs to TI's Advanced CMOS (AC) logic family, engineered for high-speed, low-noise, and latch-up-resistant operation in mission-critical digital control and sequencing applications.

FAQ

What is the maximum operating frequency of the 74AC11112?

The 74AC11112 supports a maximum clock frequency of 70 MHz at VCC = 5 V and TA = 25°C, with guaranteed timing over its full −40°C to +85°C operating range. This rating is validated by measured tPLH/tPHL delays of 3.4–6.3 ns and setup/hold times of 3.5 ns / 1 ns. The 74AC11112 achieves this performance using TI's EPIC™ 1-µm CMOS process and optimized internal gate design.

Does the 74AC11112 support asynchronous preset and clear functions?

Yes, the 74AC11112 features fully independent, active-low asynchronous preset (1PRE, 2PRE) and clear (1CLR, 2CLR) inputs per flip-flop. When asserted, these inputs force Q and Q to defined logic states regardless of clock or J/K inputs-enabling immediate state initialization or fault recovery. This behavior is confirmed in the function table and timing diagrams of the official SCAS073A datasheet.

What package type is used for the 74AC11112?

The 74AC11112 is packaged in a 16-pin plastic small-outline integrated circuit (SOIC) designated as the "D" package per TI documentation. Its pinout follows the standard dual J-K flip-flop layout with center-aligned VCC (pin 14) and GND (pin 7), a feature designed to reduce high-speed switching noise and improve PCB layout efficiency.

Can the 74AC11112 be used in toggle mode?

Yes, the 74AC11112 can operate in toggle mode by connecting both J and K inputs high on either or both flip-flops. In this configuration, each negative clock edge toggles the output state (Q and Q swap), effectively creating a divide-by-2 counter. This functionality is explicitly documented in the device description and function table of the SCAS073A datasheet.

What is the supply voltage range for the 74AC11112?

The 74AC11112 operates over a supply voltage range of 3 V to 5.5 V, supporting both 3.3 V and 5 V system rails. Electrical characteristics-including VOH/VOL, IOH/IOL, and timing-are fully specified across this range, with key parameters like max clock frequency (70 MHz) and propagation delay (3.4–6.3 ns) guaranteed at VCC = 5 V. This flexibility enables use in mixed-voltage digital systems.