Texas Instruments CD74ACT109ME4

Overview

CD74ACT109ME4 from Texas Instruments is a dual J-K positive-edge-triggered flip-flop with independent clear (CLR) and preset (PRE) inputs, operating at 4.5–5.5 V supply, delivering ±24-mA output drive, 114-MHz max clock frequency, and balanced propagation delays (2.6–9.4 ns). It performs toggle or D-type functions in digital control logic, clock-domain synchronization, and state-machine sequencing.

For engineers reviewing the CD74ACT109ME4 datasheet, CD74ACT109ME4 pinout, CD74ACT109ME4 application, or CD74ACT109ME4 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), SCR-latchup-resistant CMOS process, 2-kV ESD protection per MIL-STD-883, and SOIC-16 package thermal impedance of 73°C/W.

Technical Context

The CD74ACT109ME4 implements two independent edge-triggered storage elements with asynchronous active-low CLR and PRE, enabling immediate state override regardless of clock or data inputs. Its logic diagram confirms complementary Q/Q outputs, internal transmission gates for J/K path control, and voltage-level–based clock triggering-not dependent on rise time.

It uses an ACT (Advanced CMOS TTL-compatible) process delivering bipolar-speed performance (114 MHz) with CMOS power efficiency (ICC ≤ 80 µA at 25°C, 40 µA over full temp range). Input unit loads are differentiated: CLK and J = 1.0, K = 0.53, PRE/CLR = 0.58-enabling precise fanout calculation to 15 F-series devices.

Key Specifications

Pinout & Package

CD74ACT109ME4 is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, designated as "M" by Texas Instruments, with 1.27-mm pitch, JEDEC MS-012AC compliant footprint, and moisture sensitivity level (MSL) Level-1 (unlimited floor life at <30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT109N and CD74HC109M, the CD74ACT109ME4 uniquely combines extended temperature support (–55°C to +125°C), SOIC packaging, full TTL compatibility, and 114-MHz capability-making it the sole option for ruggedized, high-speed, surface-mount J-K logic in aerospace and industrial control.

Availability

CD74ACT109ME4 is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and digital test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74ACT109ME4 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, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and aerospace markets.

The CD74ACT109ME4 belongs to TI's Advanced CMOS (ACT) logic family, engineered to deliver bipolar-speed performance with CMOS power efficiency and robustness for mission-critical digital control applications.

FAQ

What is the maximum clock frequency supported by the CD74ACT109ME4?

The CD74ACT109ME4 supports a maximum clock frequency of 114 MHz over the –40°C to +85°C operating range and 100 MHz over the full –55°C to +125°C range. These values are measured under specified conditions: VCC = 5 V ± 0.5 V, CL = 50 pF, and 50% duty cycle. The CD74ACT109ME4 achieves this speed while maintaining balanced propagation delays and TTL-compatible input thresholds.

Does the CD74ACT109ME4 support true dual independent operation of its two J-K flip-flops?

Yes, the CD74ACT109ME4 provides two fully independent J-K flip-flops, each with dedicated J, K, CLK, PRE, CLR, Q, and Q̅ terminals. There is no shared internal logic between them-each responds solely to its own control and data inputs. This independence allows simultaneous use in separate timing domains or state machines on the same die, confirmed by the functional table and logic diagram in the official TI datasheet SCHS327.

Can the CD74ACT109ME4 be used as a D-type flip-flop, and how is that configured?

Yes, the CD74ACT109ME4 can operate as a D-type flip-flop by connecting the J and K inputs together-either externally tied to the same signal or internally via PCB trace. When J = K, the flip-flop toggles only when J = K = 1; otherwise, it holds or resets/set based on the common input value. This configuration is explicitly validated in the device description and function table, making the CD74ACT109ME4 versatile for both J-K and D-type roles without external logic.

What is the meaning of the "ME4" suffix in CD74ACT109ME4?

The "ME4" suffix identifies the specific packaging and marking variant of the CD74ACT109: "M" denotes the SOIC-16 package, "E" indicates tape-and-reel packaging (as opposed to tube), and "4" is a TI internal revision or assembly code. Per TI's packaging addendum, CD74ACT109M96 is the orderable part number for this variant, with "ME4" appearing as a top-side marking variant on certain production lots-both refer to the same SOIC-16, MSL Level-1, –55°C to +125°C qualified device.

Is the CD74ACT109ME4 compatible with 3.3-V logic systems?

No, the CD74ACT109ME4 is not designed for 3.3-V operation. Its recommended supply voltage is strictly 4.5 V to 5.5 V, and its TTL-compatible inputs require VIH ≥ 2 V and VIL ≤ 0.8 V-parameters optimized for 5-V signaling. Driving it from 3.3-V sources risks marginal high-level recognition, and powering it at 3.3 V violates absolute maximum ratings and results in undefined functionality. For 3.3-V systems, consider TI's SN74LVC109 or similar LVCMOS logic.