Texas Instruments CY74FCT2574TSOCE4

Overview

CY74FCT2574TSOCE4 from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with 3-state outputs, designed for high-speed bus-oriented applications. It features 25-Ω output series resistors to suppress transmission-line reflections, Ioff support for partial-power-down operation, and TTL-compatible input/output logic levels. Its typical 250-MHz switching rate and matched rise/fall times make it suitable for noise-sensitive digital systems such as industrial control backplanes and data acquisition interfaces.

For engineers reviewing the CY74FCT2574TSOCE4 datasheet, CY74FCT2574TSOCE4 pinout, CY74FCT2574TSOCE4 application, or CY74FCT2574TSOCE4 equivalent, key selection criteria include its 5.2 ns propagation delay (tPLH/tPHL), 12 mA sink / 15 mA source drive capability, 25-Ω integrated output termination, Ioff-enabled power-down isolation, and SOIC-20 package compatibility with legacy FCT logic designs.

Technical Context

This device implements eight independent D-type latches synchronized to the low-to-high transition of a common buffered clock (CP) input. Each flip-flop stores its D-input state meeting 2 ns setup and 1.5 ns hold time requirements, with outputs enabled or disabled via a shared active-low output-enable (OE) signal.

The CY74FCT2574TSOCE4 integrates edge-rate control circuitry and on-die 25-Ω series resistors per output to minimize ringing and ground bounce in high-speed parallel buses. Its Ioff specification ensures <±1 µA leakage when VCC = 0 V and outputs are biased to 4.5 V, enabling safe hot-insertion and multi-rail system partitioning without backdrive current.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.6 mm × 12.83 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY74FCT2574TSOCE4, CY74FCT2374TSOCE4 offers identical performance in a different physical layout, while SN74FCT574NSR trades integrated noise suppression and power-down safety for lower unit cost and wider availability - making CY74FCT2574TSOCE4 optimal for noise-sensitive, modular, or hot-pluggable designs.

Availability

CY74FCT2574TSOCE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, automated test equipment pattern generation, and programmable logic controller I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for CY74FCT2574TSOCE4 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 CY74FCT2574TSOCE4 belongs to TI's FCT logic family, engineered specifically for high-speed, low-noise, bus-oriented digital systems where signal integrity, power sequencing robustness, and TTL compatibility are critical design requirements.

FAQ

What is the maximum clock frequency supported by CY74FCT2574TSOCE4?

CY74FCT2574TSOCE4 supports a typical switching rate of 250 MHz, with propagation delays as low as 2 ns (tPLH/tPHL). Its guaranteed maximum operating frequency depends on system-level timing margins including setup/hold times (2 ns tsu, 1.5 ns th) and load capacitance; under standard 50-pF conditions and 5-V supply, it reliably operates above 100 MHz in well-designed PCB layouts.

Does CY74FCT2574TSOCE4 support partial power-down mode?

Yes, CY74FCT2574TSOCE4 fully supports partial-power-down mode via its Ioff feature. When VCC = 0 V and outputs are biased to up to 4.5 V, leakage current is limited to ±1 µA, preventing damaging backflow current. This allows safe isolation of unpowered sections in multi-rail systems without affecting upstream logic states.

What is the purpose of the 25-Ω output series resistance in CY74FCT2574TSOCE4?

The 25-Ω output series resistance in CY74FCT2574TSOCE4 is integrated on-die to dampen transmission-line reflections on unterminated PCB traces. It reduces overshoot, undershoot, and ringing - improving signal integrity and lowering EMI - without requiring external resistors, thereby simplifying layout and reducing bill-of-materials cost.

Is CY74FCT2574TSOCE4 pin-compatible with other FCT-series octal registers?

CY74FCT2574TSOCE4 is functionally and pinout-compatible with CY74FCT2374T-series devices in the same SOIC-20 package, but differs physically: all D inputs occupy pins 1–8 and all O outputs occupy pins 11–18, whereas CY74FCT2374T interleaves inputs and outputs. Thus, it is not mechanically pin-compatible with CY74FCT2374TSOCE4 despite identical pin count and package outline.

What are the recommended operating conditions for CY74FCT2574TSOCE4?

CY74FCT2574TSOCE4 is specified for VCC = 4.75–5.25 V, ambient temperature TA = –40°C to +85°C. Input voltage must stay within VIH ≥ 2.0 V (high) and VIL ≤ 0.8 V (low); unused inputs must be tied to VCC or GND. All timing parameters assume CL = 50 pF and are validated across the full operating range per JEDEC JESD8-6A.