Texas Instruments 74FCT2374ATSOCTE4

Overview

74FCT2374ATSOCTE4 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 partial-power-down support, matched rise/fall times, and TTL-compatible logic levels. Typical propagation delay is 6.5 ns at 5 V, with 15 mA source / 12 mA sink drive capability.

For engineers reviewing the 74FCT2374ATSOCTE4 datasheet, 74FCT2374ATSOCTE4 pinout, 74FCT2374ATSOCTE4 application, or 74FCT2374ATSOCTE4 equivalent, key selection criteria include 3-state bus interface timing, I_off protection for hot-swap systems, 25-Ω on-die termination for reflection suppression, and −40°C to 85°C industrial temperature operation.

Technical Context

This device implements eight independent D-type latches triggered on the low-to-high transition of a common buffered clock (CP). Output-enable (OE) controls all eight 3-state outputs simultaneously, with no effect on internal flip-flop state. The I_off circuitry disables outputs when V_CC = 0 V, preventing backflow current during partial power-down.

Edge-rate control circuitry and integrated 25-Ω series output resistors reduce transmission-line reflections and improve noise immunity. VOH is reduced to ~3.3 V (typical), making it compatible with mixed-voltage TTL/CMOS systems while maintaining full 5-V supply operation.

Key Specifications

Pinout & Package

74FCT2374ATSOCTE4 is housed in a 20-pin SOIC (SO) package per JEDEC MS-013, 7.6 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT2374ATSOCT, 74FCT2374ATSOCTE4 offers identical performance but with TI's enhanced tape-and-reel packaging (E4 suffix) for automated SMT placement; versus 74ACT273SCX, it provides essential 3-state bus control and I_off protection missing in the ACT variant.

Availability

74FCT2374ATSOCTE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, test equipment pattern generators, and legacy computer expansion cards requiring stable component supply across extended temperature ranges.

Supply support for 74FCT2374ATSOCTE4 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 interfaces.

The 74FCT2374ATSOCTE4 belongs to TI's FCT logic family, engineered for noise-immune, high-speed 5-V bus interfacing in industrial and automotive systems where signal integrity and power sequencing robustness are critical.

FAQ

What is the maximum clock frequency supported by the 74FCT2374ATSOCTE4?

The 74FCT2374ATSOCTE4 supports a typical switching rate of 250 MHz, with guaranteed timing parameters validated up to 150 MHz based on 6.5 ns max propagation delay and 1.5 ns min pulse width. For reliable operation, system clock edges must meet 2 ns setup and 1.5 ns hold time requirements relative to data inputs.

Does the 74FCT2374ATSOCTE4 support hot-swap or partial-power-down operation?

Yes, the 74FCT2374ATSOCTE4 includes I_off circuitry that disables outputs when V_CC = 0 V, limiting reverse current to ±1 µA. This allows safe insertion/removal in live backplane systems and supports controlled power sequencing in multi-rail industrial designs without risk of latch-up or damage.

How does the 25-Ω output series resistance in the 74FCT2374ATSOCTE4 improve signal integrity?

The 25-Ω on-die series resistor in the 74FCT2374ATSOCTE4 matches typical PCB trace impedance (50–75 Ω) in source-series termination configurations. This reduces signal reflections, overshoot, and ringing on unterminated traces up to 15 cm long, eliminating the need for external discrete resistors and saving board space and BOM cost.

Can the 74FCT2374ATSOCTE4 interface directly with 3.3-V logic devices?

Yes - the 74FCT2374ATSOCTE4 delivers a reduced VOH of ~3.3 V (typical at 15 mA load), providing natural compatibility with 3.3-V CMOS inputs while operating from a 5-V supply. Its TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) also accept 3.3-V logic highs without level shifting.

What is the function of the OE pin on the 74FCT2374ATSOCTE4?

The OE (output enable) pin on the 74FCT2374ATSOCTE4 is an active-low control that places all eight outputs (O0–O7) into high-impedance state when driven high. It has no effect on internal flip-flop states or clock operation - data remains latched and unchanged regardless of OE status, enabling true bus isolation.