Texas Instruments CY74FCT2574TSOCT

Overview

CY74FCT2574TSOCT 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 VOH of 3.3 V and matched rise/fall times enable clean signal integrity in 5-V digital systems such as industrial control backplanes.

For engineers reviewing the CY74FCT2574TSOCT datasheet, CY74FCT2574TSOCT pinout, CY74FCT2574TSOCT application, or CY74FCT2574TSOCT equivalent, key selection criteria include propagation delay (max 10 ns), 3-state enable timing (tPZH/tPHZ ≤ 8 ns), Ioff leakage (< ±1 µA at VCC = 0 V), and SOIC-20 package compatibility with legacy FCT logic designs.

Technical Context

The CY74FCT2574TSOCT implements eight independent D-type flip-flops sharing a common buffered clock (CP) and output-enable (OE) input. Each flip-flop captures its D-input state on the low-to-high CP transition, with setup time (2 ns) and hold time (1.5 ns) specified under 4.75–5.25 V supply conditions.

Its 3-state outputs are controlled solely by OE: when OE is low, registered data appears at O0–O7; when OE is high, all outputs enter high-impedance state without affecting internal flip-flop states. The integrated 25-Ω series termination resistors reduce ringing on PCB traces, and Ioff circuitry prevents backflow current during power-down sequences.

Key Specifications

Pinout & Package

SOIC-20 package (DW suffix), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit registered buffer applications.

Compared with CY74FCT2574TSOCT, CY74FCT2374TSOCT offers identical timing and drive strength but demands layout changes, while SN74FCT574NSR sacrifices noise suppression and power-down safety for lower unit cost - making CY74FCT2574TSOCT optimal for robust, upgrade-ready 5-V bus systems.

Availability

CY74FCT2574TSOCT is available at Aetrix Electronics and suitable for industrial backplane interfaces, automated test equipment data capture, and legacy system upgrades requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for CY74FCT2574TSOCT 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 interface and timing components.

The CY74FCT2574TSOCT belongs to TI's FCT logic family, engineered specifically for noise-immune, 5-V bus interfacing in industrial and telecom infrastructure where signal integrity and power sequencing robustness are critical.

FAQ

What is the maximum clock frequency supported by CY74FCT2574TSOCT?

CY74FCT2574TSOCT has a typical switching rate of 250 MHz and a maximum propagation delay of 10 ns, supporting reliable operation at clock frequencies up to approximately 100 MHz in real-world PCB environments with 50-pF loads. The device's timing is guaranteed down to 7 ns pulse width on CP, enabling use in high-speed synchronous bus applications where setup and hold margins are tightly constrained.

Does CY74FCT2574TSOCT support hot-swap or partial-power-down operation?

Yes, CY74FCT2574TSOCT includes Ioff circuitry that disables outputs and limits leakage to ±1 µA when VCC = 0 V, enabling safe hot-insertion into live backplanes and partial-power-down modes. This feature prevents damaging current backflow between powered and unpowered system sections - a critical requirement for modular industrial and telecom equipment.

Is CY74FCT2574TSOCT pin-compatible with older 74F574 or 74LS574 devices?

CY74FCT2574TSOCT uses the same SOIC-20 pinout as 74F574 and 74LS574, with identical D0–D7, CP, OE, O0–O7, VCC, and GND assignments. It is a direct functional and pin-compatible replacement, offering improved noise characteristics, tighter timing, and Ioff support - allowing drop-in upgrades without PCB modification.

What is the purpose of the 25-Ω output series resistors in CY74FCT2574TSOCT?

The integrated 25-Ω output series resistors in CY74FCT2574TSOCT dampen transmission-line reflections on PCB traces, significantly reducing overshoot, undershoot, and ringing without requiring external components. This improves signal integrity on unterminated or marginally terminated 5-V buses, especially in backplane and cable-driven applications up to 15 cm in length.

How does the output-enable (OE) function behave relative to the internal register state in CY74FCT2574TSOCT?

In CY74FCT2574TSOCT, the OE input controls only the 3-state output drivers - it has no effect on the internal flip-flop states. When OE is high, outputs go high-impedance while stored data remains intact; when OE returns low, previously registered values reappear immediately at O0–O7. This allows seamless bus sharing and glitch-free data handoff between multiple register sources.