Texas Instruments CY74FCT2574ATQC

Overview

CY74FCT2574ATQC from Texas Instruments is an 8-bit edge-triggered D-type flip-flop register with 3-state outputs, 25-Ω integrated output series resistors, I_off partial-power-down support, and TTL-compatible input/output logic levels. It operates at V_CC = 4.75–5.25 V, delivers 12 mA sink / 15 mA source drive, and achieves 6.5 ns typical propagation delay (t_PLH/t_PHL) for high-speed bus interface applications in industrial control backplanes.

For engineers reviewing the CY74FCT2574ATQC datasheet, CY74FCT2574ATQC pinout, CY74FCT2574ATQC application, or CY74FCT2574ATQC equivalent, this device is selected for noise-sensitive 5-V digital systems requiring controlled edge rates, bus isolation via 3-state outputs, and guaranteed setup/hold timing (t_su = 2 ns, t_h = 1.5 ns) under –40°C to 85°C conditions.

Technical Context

This device implements eight independent D-type latches synchronized to the low-to-high transition of a common buffered clock (CP), with all inputs on one side and all outputs on the opposite side of the QSOP package - a layout optimized for PCB routing separation between data-in and data-out traces. Its edge-rate control circuitry and 25-Ω series termination reduce transmission-line reflections without external resistors.

The I_off feature disables outputs when V_CC = 0 V, preventing backflow current during partial power-down, while matched rise/fall times and hysteresis (V_hys = 0.2 V) ensure robust noise immunity. Output-enable (OE) is active-low and does not affect internal flip-flop states, enabling transparent bus arbitration.

Key Specifications

Pinout & Package

Package: 20-pin QSOP (DBQ), 0.154-inch body width, RoHS-compliant green finish, MSL Level-2 (260°C, 1 year).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY74FCT2574CTQCT, CY74FCT2574ATQC trades 1.3 ns of speed margin for significantly lower dynamic power and enhanced noise immunity; versus SN74FCT574N, it provides surface-mount reliability, integrated termination, and I_off-enabled system-level power management - making it the preferred choice for production-grade 5-V industrial and communications hardware.

Availability

CY74FCT2574ATQC is available at Aetrix Electronics and suitable for industrial backplane interfaces, automated test equipment data capture, and legacy bus extension applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for CY74FCT2574ATQC 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 industrial and automotive components.

CY74FCT2574ATQC belongs to TI's FCT logic family, engineered for noise-resilient 5-V digital systems requiring precise timing, bus isolation, and robust operation across extended industrial temperature ranges.

FAQ

What is the maximum operating temperature range for CY74FCT2574ATQC?

CY74FCT2574ATQC is fully specified for operation from –40°C to +85°C ambient temperature, meeting industrial-grade environmental requirements. This range is validated across all electrical parameters including propagation delay, setup/hold time, and output drive strength, with no derating needed within these limits.

Does CY74FCT2574ATQC support partial power-down, and how is it implemented?

Yes, CY74FCT2574ATQC supports partial power-down via its I_off circuitry. When V_CC = 0 V, the outputs are disabled and leakage is limited to ±1 µA, preventing damaging back-current flow from powered bus lines into the unpowered device - a critical feature for hot-swap and modular system architectures.

What package type and pin count does CY74FCT2574ATQC use?

CY74FCT2574ATQC uses a 20-pin QSOP (SSOP) package with DBQ drawing, 0.635 mm pitch, and 0.154-inch body width. This surface-mount package supports high-density PCB layouts and is moisture-sensitivity level 2 (MSL-2), requiring bake prior to reflow if exposed beyond floor life.

How does the 25-Ω output series resistance in CY74FCT2574ATQC improve system performance?

The integrated 25-Ω series resistors in CY74FCT2574ATQC dampen transmission-line reflections on PCB traces, reducing ringing and ground bounce without requiring external components. This directly improves signal integrity in high-speed 5-V bus applications, especially with trace lengths exceeding 2 inches or driving capacitive loads >50 pF.

Is CY74FCT2574ATQC pin-compatible with older 74F574 devices?

CY74FCT2574ATQC is functionally compatible with 74F574 but not pin-compatible due to its split I/O layout: all D inputs occupy pins 2–9 (left side), while all O outputs occupy pins 12–19 (right side). This differs from the interleaved pinout of 74F574, requiring PCB layout adaptation despite identical logic function and terminal count.