Texas Instruments CY74FCT2827ATQC

Overview

CY74FCT2827ATQC from Texas Instruments is a 10-bit noninverting buffer with dual 3-state enable inputs (OE1, OE2), designed for high-speed bus interface in wide data/address paths. It delivers 8 ns max propagation delay at 50 pF load, ±15 mA output drive, and features 25-Ω on-die series termination resistors to suppress transmission-line reflections. Used in industrial backplane and memory subsystem buffering where TTL-compatible logic levels and partial-power-down support are required.

For engineers reviewing the CY74FCT2827ATQC datasheet, CY74FCT2827ATQC pinout, CY74FCT2827ATQC application, or CY74FCT2827ATQC equivalent, key selection criteria include its QSOP-24 package, –40°C to 85°C operating range, Ioff-enabled partial-power-down capability, and compatibility with FCT/AM29827 logic families.

Technical Context

This device implements dual independent 3-state control logic: outputs go high-impedance when either OE1 or OE2 is high, enabling flexible bus arbitration. Its edge-rate control circuitry shapes rise/fall times to minimize simultaneous switching noise while maintaining matched tPLH/tPHL performance.

The integrated 25-Ω output series resistors reduce signal overshoot and ringing on PCB traces without requiring external termination. All inputs include clamp diodes, and Ioff protection prevents reverse current flow during power sequencing-critical for hot-swap and multi-rail systems.

Key Specifications

Pinout & Package

Package: QSOP-24 (DBQ), 3.9 mm × 8.7 mm body, 0.635 mm pitch, 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 10-bit buffer applications.

Compared with SN74F244N and 74ACT244SCX, CY74FCT2827ATQC uniquely combines Ioff protection, integrated 25-Ω termination, and FCT-family TTL compatibility-making it the sole option for noise-sensitive, hot-pluggable 5-V bus interfaces requiring zero-layout-change upgrades.

Availability

CY74FCT2827ATQC is available at Aetrix Electronics and suitable for industrial automation, memory subsystem design, and legacy system modernization requiring stable component supply across extended product lifecycles.

Supply support for CY74FCT2827ATQC 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 decades of experience in high-reliability industrial and automotive ICs.

CY74FCT2827ATQC belongs to TI's FCT logic family, engineered specifically for noise-immune, high-drive 5-V bus interfacing in industrial control, telecom infrastructure, and instrumentation systems.

FAQ

What is the maximum operating temperature range for CY74FCT2827ATQC?

CY74FCT2827ATQC is rated for operation from –40°C to +85°C ambient temperature, validated per TI's recommended operating conditions. This range supports deployment in industrial enclosures without forced cooling and aligns with standard commercial-grade thermal profiles for programmable logic controllers and data acquisition systems. The device maintains specified tPLH/tPHL and drive strength across this full range.

Does CY74FCT2827ATQC support hot-swap functionality?

Yes, CY74FCT2827ATQC supports hot-swap via its Ioff circuitry: when VCC = 0 V, output leakage is limited to ±1 µA even with up to 4.5 V applied at Y pins. This prevents damaging back-current flow from a live backplane into an unpowered module. The feature is explicitly characterized in the datasheet's electrical characteristics table and requires no external components to implement.

How does the 25-Ω output series resistance in CY74FCT2827ATQC improve signal integrity?

The 25-Ω on-die series resistor in CY74FCT2827ATQC matches typical PCB trace impedance (50–75 Ω) in source-series termination configurations. When combined with a 50-Ω load, it forms a properly damped transmission line, reducing overshoot, ringing, and ground bounce. Measured data shows >8 dB reduction in reflected energy versus non-terminated equivalents at 100 MHz, directly improving eye diagram margins.

Is CY74FCT2827ATQC pin-compatible with CY74FCT827T?

Yes, CY74FCT2827ATQC is functionally and pin-compatible with CY74FCT827T, sharing identical QSOP-24 pinout, dual OE architecture, and 10-bit D-to-Y mapping. The datasheet explicitly states "The CY74FCT2827T can replace the CY74FCT827T to reduce noise," confirming mechanical and logical interchangeability without PCB modification.

What is the purpose of the dual OE inputs (OE1 and OE2) in CY74FCT2827ATQC?

The dual OE inputs in CY74FCT2827ATQC provide hierarchical bus control: either OE1 or OE2 asserted high places all Y0–Y9 outputs in high-impedance state. This enables flexible arbitration schemes-for example, OE1 driven by system-level bus grant and OE2 by local module readiness-without requiring external OR logic. The function table confirms "X" (don't-care) behavior on the inactive enable, simplifying control logic design.