Texas Instruments CY74FCT2574TSOCTE4

Overview

CY74FCT2574TSOCTE4 from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with 3-state outputs, 25-Ω integrated output series resistors, 12-mA sink / 15-mA source drive, and I_off support for partial-power-down operation - used in high-speed bus interface and data latching applications operating at 5 V.

For engineers reviewing the CY74FCT2574TSOCTE4 datasheet, CY74FCT2574TSOCTE4 pinout, CY74FCT2574TSOCTE4 application, or CY74FCT2574TSOCTE4 equivalent, key selection criteria include propagation delay (t_PLH/t_PHL ≤ 10 ns), 3-state enable timing (t_PZH/t_PZL ≤ 12.5 ns), output impedance matching, and compatibility with TTL-level inputs and 3.3-V–compatible VOH.

Technical Context

This device implements eight independent D-type flip-flops sharing a common buffered clock (CP) and output-enable (OE) control. Each flip-flop captures D-input state on the low-to-high CP transition, with setup/hold times of 2 ns and 1.5 ns respectively at V_CC = 5 V.

Edge-rate control circuitry and on-die 25-Ω series termination resistors suppress transmission-line reflections; I_off protection disables outputs during power-down to prevent backflow current, enabling hot-insertion in mixed-voltage systems.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 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 3-state D-register applications.

Compared with CY74FCT2374T and SN74FCT574NSR, the CY74FCT2574TSOCTE4 uniquely combines side-isolated I/O pin mapping, on-die termination, and I_off - making it optimal for space-constrained, noise-critical, or hot-pluggable 5-V bus designs.

Availability

CY74FCT2574TSOCTE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interfacing, and high-speed data acquisition systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for CY74FCT2574TSOCTE4 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The CY74FCT2574TSOCTE4 belongs to TI's FCT logic family, designed specifically for high-speed, low-noise 5-V bus interface applications where signal integrity, power-down safety, and TTL compatibility are critical.

FAQ

What is the maximum clock frequency supported by the CY74FCT2574TSOCTE4?

The CY74FCT2574TSOCTE4 supports a typical switching rate of 250 MHz, with guaranteed timing performance up to 100 MHz based on t_PLH/t_PHL ≤ 10 ns and t_su/t_h ≤ 2 ns/1.5 ns. This enables reliable operation in high-speed data capture and bus multiplexing applications where precise edge-aligned sampling is required. The CY74FCT2574TSOCTE4 achieves this while maintaining low power consumption and signal integrity through integrated edge-rate control.

Does the CY74FCT2574TSOCTE4 support hot-swap or partial-power-down operation?

Yes, the CY74FCT2574TSOCTE4 includes I_off circuitry that disables outputs when V_CC = 0 V, limiting reverse current to ±1 µA. This feature enables safe insertion and removal in live backplane or modular systems without disrupting other powered components. The CY74FCT2574TSOCTE4 is fully specified for partial-power-down applications per JESD78 guidelines, making it suitable for redundant power architectures and field-replaceable units.

How does the 25-Ω output series resistance in the CY74FCT2574TSOCTE4 improve signal integrity?

The CY74FCT2574TSOCTE4 integrates 25-Ω series resistors at each output to dampen transmission-line reflections caused by impedance mismatches on PCB traces. This reduces ringing, overshoot, and EMI without requiring external components or layout adjustments. Measured ROUT ranges from 20 Ω to 40 Ω, ensuring consistent damping across process/voltage/temperature variations - a key advantage of the CY74FCT2574TSOCTE4 over standard registers lacking on-die termination.

Can the CY74FCT2574TSOCTE4 interface directly with 3.3-V logic devices?

Yes, the CY74FCT2574TSOCTE4 delivers a typical VOH of 3.3 V at –15 mA, providing sufficient margin for reliable interfacing with 3.3-V CMOS inputs while operating from a 5-V supply. Its VIL = 0.8 V and VIH = 2.0 V also accept standard TTL thresholds, eliminating level shifters in mixed-voltage systems. This dual-voltage compatibility is a core design feature of the CY74FCT2574TSOCTE4, distinguishing it from earlier FCT variants.

What is the pinout configuration difference between CY74FCT2574TSOCTE4 and CY74FCT2374T?

The CY74FCT2574TSOCTE4 places all eight D inputs (pins 2–9) on one side and all eight O outputs (pins 12–19) on the opposite side, enabling clean layer routing and minimizing crosstalk. In contrast, the CY74FCT2374T interleaves inputs and outputs across the package. This side-isolated layout is unique to the CY74FCT2574TSOCTE4 and simplifies PCB design for high-density bus interfaces where signal grouping is essential.