Texas Instruments CD74HCT74M96

Overview

CD74HCT74M96 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with asynchronous clear and preset inputs per channel, operating across 4.5 V to 5.5 V supply voltage, supporting –55°C to +125°C industrial/military temperature range, with 15 ns typical propagation delay (VCC = 4.5 V, CL = 50 pF), used in clock division and momentary-to-toggle switch conversion circuits.

For engineers reviewing the CD74HCT74M96 datasheet, CD74HCT74M96 pinout, CD74HCT74M96 application, or CD74HCT74M96 equivalent, key selection criteria include TTL-compatible input thresholds, dual independent edge-triggered storage, guaranteed setup/hold timing at 5 V, and SOIC-14 packaging for high-reliability embedded control and instrumentation systems.

Technical Context

The CD74HCT74M96 implements two electrically isolated D-type flip-flops, each with separate asynchronous active-low clear (CLR) and preset (PRE) inputs, and a shared positive-edge-sensitive clock (CLK) per channel. Its HCT logic family ensures TTL-level input compatibility while maintaining CMOS output drive strength and low static power consumption.

Each flip-flop latches data on the rising edge of CLK only when both CLR and PRE are high; either active-low control overrides clocked operation to force Q to L or H respectively. Propagation delays (tpd ≤ 53 ns max at VCC = 4.5 V) and setup/hold times (tsu = 15 ns, th = 3 ns) are fully characterized across the full temperature range.

Key Specifications

Pinout & Package

CD74HCT74M96 is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm, with standard JEDEC MS-012AC footprint and gull-wing leads compatible with automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HCT74M96, SN74HCT74DR offers identical functionality with updated packaging logistics, while MC74HC74ADTR2G trades TTL compatibility for ultra-low standby current - making the former a drop-in upgrade and the latter a system-level redesign consideration.

Availability

CD74HCT74M96 is available at Aetrix Electronics and suitable for industrial control sequencing, test equipment clock division, aerospace power-up initialization, and automotive body controller state management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HCT74M96 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 over 50 years of innovation in high-reliability digital ICs.

The CD74HCT74M96 belongs to TI's legacy HCT logic family, engineered for seamless interoperability between TTL and CMOS systems in mission-critical industrial, military, and automotive applications.

FAQ

What is the maximum clock frequency supported by CD74HCT74M96?

The CD74HCT74M96 supports a maximum clock frequency of 20 MHz at VCC = 4.5 V and TA = –55°C to +125°C, as specified in the switching characteristics table. This limit ensures setup/hold timing margins are maintained across the full operating temperature range, with fmax dropping to 15 MHz at VCC = 4.5 V under worst-case conditions.

Does CD74HCT74M96 require external pull-up resistors on unused inputs?

Yes - all unused inputs of CD74HCT74M96 must be terminated to either VCC or GND to prevent floating nodes that cause excessive current draw and undefined logic states. A 10-kΩ pull-up or pull-down resistor is recommended, matching the input leakage current specification (±1 µA max) and ensuring stable VIH/VIL levels per the recommended operating conditions.

Can CD74HCT74M96 operate reliably at 3.3 V supply voltage?

No - CD74HCT74M96 is not characterized or guaranteed for operation at 3.3 V. Its HCT family design requires 4.5 V to 5.5 V supply for TTL-compatible input thresholds and specified AC performance. For 3.3 V systems, consider HC-family alternatives like CD74HC74M96, which has CMOS input thresholds but lacks native TTL compatibility.

What is the thermal resistance (RθJA) of CD74HCT74M96 in its SOIC-14 package?

The junction-to-ambient thermal resistance (RθJA) for CD74HCT74M96 in the SOIC-14 (D) package is 133.6°C/W, as documented in the thermal information section. This value assumes standard JEDEC 2-layer board layout; actual thermal performance improves with PCB copper area, thermal vias, and airflow - critical for sustained operation near +125°C ambient.

How does the asynchronous clear function interact with the clock signal in CD74HCT74M96?

In CD74HCT74M96, the asynchronous clear (CLR) input takes immediate precedence over the clock: when CLR is driven LOW, Q is forced LOW and Q̅ forced HIGH within nanoseconds, regardless of CLK state or timing. This override occurs independently of clock edges, enabling deterministic reset during power-up, fault recovery, or emergency shutdown sequences without waiting for a clock cycle.