Texas Instruments CD74AC109M96

Overview

CD74AC109M96 from Texas Instruments is a dual J-K positive-edge-triggered flip-flop with independent asynchronous clear (CLR) and preset (PRE) inputs, operating across 1.5V–5.5V supply range, delivering ±24mA output drive, 114MHz max clock frequency at 5V, and ESD protection exceeding 2kV per MIL-STD-883 - used in synchronous logic control, state machines, and digital counters in industrial timing circuits.

For engineers reviewing the CD74AC109M96 datasheet, CD74AC109M96 pinout, CD74AC109M96 application, or CD74AC109M96 equivalent, key selection considerations include its dual-channel edge-triggered architecture, rail-to-rail input compatibility, guaranteed setup/hold timing at automotive temperature ranges (–55°C to 125°C), and SOIC-16 packaging for high-density PCB layouts.

Technical Context

The CD74AC109M96 implements two independent CMOS J-K flip-flops sharing no internal coupling; each channel features active-low asynchronous PRE and CLR inputs that override clocked operation. Its positive-edge-triggered behavior responds to the rising transition of CLK only when both PRE and CLR are high, enabling precise state capture under strict timing constraints.

It uses SCR-latchup-resistant fabrication and supports three distinct supply voltage tiers (1.5V, 3.3V, 5V) with corresponding timing grades: f_MAX = 9MHz at 1.5V, 81MHz at 3.3V, and 114MHz at 5V - with propagation delays as low as 2.6ns (t_PLH/t_PHL) and setup time down to 4.8ns at 5V/85°C.

Key Specifications

Pinout & Package

CD74AC109M96 is housed in a 16-pin SOIC (D) package measuring 9.90mm × 3.90mm, with standard 1.27mm pitch and gull-wing leads compatible with automated SMT assembly and IPC-7351B footprint standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AC109N and 74LVC109PW, CD74AC109M96 uniquely supports full industrial temperature range and 5V operation while maintaining sub-10ns timing - making it the only choice for high-reliability 5V systems requiring guaranteed performance from –55°C to +125°C.

Availability

CD74AC109M96 is available at Aetrix Electronics and suitable for industrial PLC logic modules, digital power supply sequencing, test equipment pattern generators, and legacy bus interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74AC109M96 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 experience in high-reliability logic families and automotive-qualified components.

The CD74AC109M96 belongs to TI's AC-series advanced CMOS logic product line, designed specifically for applications demanding wide supply voltage range, high noise immunity, and robust operation in harsh thermal and electrical environments.

FAQ

What is the maximum clock frequency supported by CD74AC109M96 at 5V supply?

The CD74AC109M96 supports a maximum clock frequency of 114MHz at VCC = 5V and TA ≤ 85°C, as specified in Section 4.8 of the datasheet. At full industrial temperature range (–55°C to 125°C), the guaranteed minimum f_MAX is 100MHz. This performance enables use in high-speed digital control and signal generation applications where precise edge-aligned state updates are required.

Does CD74AC109M96 require external pull-up or pull-down resistors on J, K, or clock inputs?

No, CD74AC109M96 does not require external pull-up or pull-down resistors on J, K, or CLK inputs. Its CMOS inputs have high impedance and defined VIH/VIL thresholds across the full 1.5V–5.5V supply range. However, TI recommends holding all unused inputs at VCC or GND to prevent floating nodes that could cause increased current consumption or erratic behavior - a practice confirmed in Section 4.3 of the datasheet.

Can CD74AC109M96 operate reliably at 1.8V supply voltage?

Yes, CD74AC109M96 operates reliably at 1.8V supply voltage, as its specified VCC range is 1.5V to 5.5V. At 1.8V, the device delivers f_MAX ≥ 12MHz (interpolated from 1.5V/9MHz and 3.3V/81MHz data), with VIH = 1.44V and VIL = 0.36V - providing 20% noise margin. This makes CD74AC109M96 suitable for mixed-voltage systems interfacing with 1.8V microcontrollers while driving 3.3V or 5V peripherals.

What is the function of the inverted outputs (Q̅) on CD74AC109M96?

The inverted outputs (Q̅) on CD74AC109M96 provide complementary logic states to the true outputs (Q), eliminating the need for external inverters in common configurations such as toggle mode (J=K=H), master-slave latches, or differential signaling paths. Each Q̅ output mirrors its associated Q with matched propagation delay (≤1.2ns skew), ensuring glitch-free transitions critical for synchronous design integrity in CD74AC109M96-based systems.

Is CD74AC109M96 pin-compatible with older TTL J-K flip-flops like SN74LS109?

No, CD74AC109M96 is not pin-compatible with SN74LS109. While both are dual J-K flip-flops in 16-pin packages, their pin assignments differ: SN74LS109 places VCC at Pin 16 and GND at Pin 8 (same), but assigns Pin 1 to 1CLK (vs. 1CLR on CD74AC109M96) and Pin 2 to 1J (vs. 1J on CD74AC109M96). The CD74AC109M96 pinout follows TI's AC-series standard (SCHS326A), requiring PCB redesign for drop-in replacement of LS-family devices.