Texas Instruments CD74AC112M

Overview

CD74AC112M from Texas Instruments is a dual J-K negative-edge-triggered flip-flop with independent preset and clear inputs, operating across 1.5 V to 5.5 V supply range. It delivers 114 MHz maximum clock frequency at 5 V, ±24 mA output drive, and balanced propagation delays (2.6–10.3 ns). Used in synchronous logic control, state machines, and digital counters within industrial timing and data-path circuits.

For engineers reviewing the CD74AC112M datasheet, CD74AC112M pinout, CD74AC112M application, or CD74AC112M equivalent, key selection criteria include negative-edge clocking behavior, dual independent J-K functionality, wide VCC range, guaranteed hold time of 0 ns, and SOIC-16 package compatibility with legacy AC-series designs.

Technical Context

The CD74AC112M implements two identical CMOS J-K flip-flops sharing no internal coupling-each features asynchronous active-low PRE and CLR, and transfers J/K data on the falling edge of CLK. Its SCR-latchup-resistant process ensures robust operation in noisy environments, while balanced tPLH/tPHL supports precise edge-aligned timing in feedback loops.

Input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), enabling reliable interfacing across 1.5 V, 3.3 V, and 5 V logic domains. Propagation delay variation remains under 1.5 ns across –55°C to 125°C, supporting deterministic timing in extended-temperature industrial systems.

Key Specifications

Pinout & Package

CD74AC112M is housed in a 16-pin SOIC (D) package with standard 1.27 mm pitch and 10.3 mm body width, compliant with JEDEC MS-012. Thermal resistance θJA = 73°C/W enables stable operation up to 125°C ambient without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AC112DR and CD74HC112M, the CD74AC112M uniquely combines military-grade temperature range (–55°C to 125°C), full 114 MHz performance at 5 V, and ±24 mA drive - making it the only option qualified for high-reliability, high-speed, extended-temperature digital control.

Availability

CD74AC112M is available at Aetrix Electronics and suitable for industrial PLC logic modules, digital power supply sequencing, test equipment pattern generators, and legacy bus interface synchronization requiring stable component supply across extended temperature ranges.

Supply support for CD74AC112M 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 since 1930, with over 80,000 products serving industrial, automotive, and communications markets.

The CD74AC112M belongs to TI's Advanced CMOS (AC) logic family, engineered for high-speed, low-power, mixed-voltage digital control in harsh-environment applications where reliability and timing precision are critical.

FAQ

What is the maximum operating temperature range for CD74AC112M?

The CD74AC112M is specified for continuous operation from –55°C to +125°C ambient temperature. This extended range is validated per MIL-PRF-38535 requirements and confirmed in the official TI datasheet SCHS325, making CD74AC112M suitable for aerospace, defense, and under-hood automotive applications where thermal stress exceeds commercial limits.

Does CD74AC112M support 1.8 V logic interfaces?

Yes, CD74AC112M supports 1.8 V operation: its recommended VCC range is 1.5 V to 5.5 V, and input thresholds scale proportionally (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC). At 1.8 V supply, VIH is guaranteed ≥1.26 V and VIL ≤0.54 V - fully compatible with standard 1.8 V CMOS outputs and inputs.

Can CD74AC112M be used as a toggle flip-flop?

Yes, CD74AC112M can operate as a toggle flip-flop by connecting both J and K inputs high. In this configuration, each negative clock edge toggles the Q output state. The datasheet explicitly confirms this behavior in the function table and description, and timing parameters (e.g., tPLH/tPHL, fmax) apply identically in toggle mode.

Is CD74AC112M pin-compatible with CD74HC112M?

Yes, CD74AC112M and CD74HC112M share identical SOIC-16 pinouts and terminal assignments per TI's package drawings. However, they differ electrically: CD74AC112M offers higher speed (114 MHz vs 60 MHz), stronger drive (±24 mA vs ±4 mA), and wider VCC range (1.5–5.5 V vs 2–6 V), so direct substitution requires validation of timing and loading constraints.

What is the meaning of "negative-edge-triggered" in CD74AC112M?

"Negative-edge-triggered" means CD74AC112M samples and transfers J/K input data to Q/Q outputs precisely on the falling (high-to-low) transition of the CLK signal. Clock triggering occurs at a defined voltage threshold (not dependent on slew rate), and data must meet setup/hold timing relative to that edge - a core behavior documented in the logic diagram and timing tables of the CD74AC112M datasheet.