Texas Instruments 74FCT2374ATSOCTG4

Overview

74FCT2374ATSOCTG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for high-speed bus-oriented applications. It features 25-Ω output series resistors, I_off support for partial-power-down mode, matched rise/fall times, and TTL-compatible input/output logic levels. Typical propagation delay is 6.5 ns at 5 V, with 15 mA source and 12 mA sink drive capability.

For engineers reviewing the 74FCT2374ATSOCTG4 datasheet, 74FCT2374ATSOCTG4 pinout, 74FCT2374ATSOCTG4 application, or 74FCT2374ATSOCTG4 equivalent, key selection criteria include 3-state bus interface timing, I_off behavior during power sequencing, output impedance control for signal integrity, and compatibility with legacy FCT/F logic families in industrial and telecom backplane designs.

Technical Context

This device implements eight independent D-type latches triggered on the low-to-high transition of a common buffered clock (CP), with asynchronous 3-state control via OE. Each flip-flop stores its respective D-input state meeting 1.5 ns setup and 1.5 ns hold time requirements.

Output enable operates independently of internal register state: when OE is low, registered data appears on O0–O7; when OE is high, all outputs enter high-impedance mode without affecting stored bits. The I_off circuitry actively disables outputs when V_CC = 0 V, preventing backflow current during partial power-down.

Key Specifications

Pinout & Package

74FCT2374ATSOCTG4 is housed in a 20-pin SOIC (SO) package with 0.300-inch body width and 1.27 mm pitch, compliant with JEDEC MS-013 and RoHS standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type register applications.

Compared with SN74FCT2374ATSOCT, the 74FCT2374ATSOCTG4 offers identical performance but may differ in tape-and-reel packaging configuration and traceability documentation; compared with 74ACT273SCX, it provides essential 3-state control and I_off for modern power-managed systems, at the cost of slightly higher complexity in enable logic.

Availability

74FCT2374ATSOCTG4 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant 5-V logic interfacing.

Supply support for 74FCT2374ATSOCTG4 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 74FCT2374ATSOCTG4 belongs to TI's Fast CMOS Technology (FCT) logic family, engineered for high-speed, low-noise 5-V digital interfacing with emphasis on signal integrity, bus contention control, and power sequencing robustness.

FAQ

What is the maximum clock frequency supported by the 74FCT2374ATSOCTG4?

The 74FCT2374ATSOCTG4 supports a typical switching rate of 250 MHz, with guaranteed timing parameters up to 150 MHz under worst-case conditions. Its 6.5 ns maximum propagation delay and 1.5 ns minimum setup/hold times allow reliable operation in systems with clock periods ≥13 ns. This makes the 74FCT2374ATSOCTG4 suitable for high-speed data acquisition and real-time control applications where deterministic latency is critical.

Does the 74FCT2374ATSOCTG4 support partial power-down operation?

Yes, the 74FCT2374ATSOCTG4 includes I_off circuitry that disables outputs when V_CC = 0 V, limiting backflow current to ±1 µA. This feature enables safe partial-power-down operation in multi-rail systems, such as hot-swappable modules or power-gated subsystems. The internal flip-flop states remain preserved during power loss, and the 74FCT2374ATSOCTG4 resumes normal operation immediately upon V_CC restoration without reset.

What is the purpose of the 25-Ω output series resistance in the 74FCT2374ATSOCTG4?

The 25-Ω on-die output series resistance in the 74FCT2374ATSOCTG4 is designed to dampen transmission-line reflections on PCB traces, reducing overshoot, undershoot, and ringing. This eliminates the need for external series termination resistors in many 5-V bus applications with trace lengths up to 15 cm. The 74FCT2374ATSOCTG4 achieves improved signal integrity and EMI performance while simplifying layout and reducing BOM count.

Can the 74FCT2374ATSOCTG4 be used with 3.3-V logic interfaces?

No, the 74FCT2374ATSOCTG4 is specified only for 4.75 V to 5.25 V operation and has TTL-compatible input thresholds (V_IH = 2.0 V, V_IL = 0.8 V). While its outputs may be recognized by some 3.3-V inputs, it lacks 3.3-V supply compatibility, I/O voltage tolerance, or level-shifting capability. For mixed-voltage systems, use dedicated level translators or 3.3-V-compatible registers such as the SN74LVC8T245 instead of the 74FCT2374ATSOCTG4.

How does the output-enable (OE) function interact with the internal register state in the 74FCT2374ATSOCTG4?

In the 74FCT2374ATSOCTG4, the OE input controls only the output drivers - it has no effect on the internal flip-flop states. When OE is high, all eight outputs (O0–O7) enter high-impedance mode regardless of stored data; when OE is low, registered values appear at the outputs. This separation allows the 74FCT2374ATSOCTG4 to retain latched data during bus arbitration or power transitions, making it ideal for applications requiring data persistence independent of bus activity.