Texas Instruments CY74FCT827CTQC

Overview

CY74FCT827CTQC from Texas Instruments is a 10-bit noninverting buffer with dual 3-state outputs, designed for high-capacitance bus interfacing in wide data/address paths. It delivers 64-mA sink and 32-mA source drive capability at 5-V operation, features Ioff partial-power-down support, and exhibits matched rise/fall times for clean signal integrity in industrial backplane and memory subsystem applications.

For engineers reviewing the CY74FCT827CTQC datasheet, CY74FCT827CTQC pinout, CY74FCT827CTQC application, or CY74FCT827CTQC equivalent, key selection criteria include its 4.4-ns propagation delay (CL = 50 pF), edge-rate control for noise reduction, TTL-compatible input/output levels, and QSOP-24 package suitability for space-constrained PCB layouts.

Technical Context

The CY74FCT827CTQC implements dual NAND-gated output enables (OE1 and OE2) to provide flexible 3-state control across all ten Y outputs. Its FCT-family architecture ensures function, pinout, and drive compatibility with industry-standard 74F/74AS logic and AM29827 devices.

It integrates edge-rate control circuitry to suppress simultaneous switching noise and supports partial-power-down via Ioff, which disables outputs and blocks reverse current flow when VCC = 0 V - critical for hot-swap and mixed-voltage system designs.

Key Specifications

Pinout & Package

Package: QSOP-24 (DBQ), 3.9-mm width, RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit bus buffer applications.

Compared with SN74FCT827CTSOCT and 74AC11010N, the CY74FCT827CTQC uniquely combines QSOP-24 compactness, Ioff-enabled hot-swap safety, and edge-rate-controlled EMI performance - making it optimal for space-constrained industrial backplanes requiring robust power sequencing.

Availability

CY74FCT827CTQC is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem buffering, hot-swappable module interfaces, and legacy system bus extensions requiring stable component supply and long-term lifecycle support.

Supply support for CY74FCT827CTQC 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 CY74FCT827CTQC belongs to TI's FCT logic family, engineered specifically for high-speed, low-noise bus interfacing in industrial control and computing infrastructure where reliability under mixed-voltage and hot-swap conditions is essential.

FAQ

What is the maximum operating temperature range for the CY74FCT827CTQC?

The CY74FCT827CTQC is rated for operation from –40°C to +85°C ambient temperature. This industrial temperature range ensures reliable performance in factory automation, motor control, and outdoor communications equipment where thermal cycling and extended runtime are common. The device maintains full electrical specifications across this range, including propagation delay, drive strength, and Ioff leakage.

Does the CY74FCT827CTQC support hot-swap functionality, and how is it implemented?

Yes, the CY74FCT827CTQC supports hot-swap via its Ioff feature. When VCC = 0 V, the Ioff circuitry disables all outputs and limits leakage current to ±1 µA, preventing damaging reverse current flow into powered downstream logic. This behavior is explicitly characterized in the datasheet and enables safe insertion/removal of boards in live backplane systems - a core requirement for modular PLC and telecom shelf designs.

How does the dual-output-enable (OE1/OE2) architecture of the CY74FCT827CTQC improve system design flexibility?

The CY74FCT827CTQC uses NAND logic for its dual OE inputs, allowing either enable to independently place outputs in high-impedance state. This enables fine-grained bus arbitration - for example, using OE1 to gate one memory bank and OE2 to gate another, or combining both for full bus isolation. Unlike single-OE buffers, this architecture eliminates need for external gating logic, reducing component count and routing complexity in multi-segment bus topologies.

Can the CY74FCT827CTQC be used as a direct replacement for older 74LS827 or 74AS827 devices?

Yes, the CY74FCT827CTQC is functionally, electrically, and pinout-compatible with 74LS827 and 74AS827 devices. It accepts identical TTL input thresholds, provides higher drive strength (64 mA sink vs. 24 mA for LS), and retains the same 24-pin QSOP/SO footprint. No PCB redesign is needed - only verification that the 4.75–5.25 V supply window aligns with system rails and that edge-rate control meets EMI targets.

What is the significance of the "C" suffix in CY74FCT827CTQC, and how does it affect timing performance?

The "C" in CY74FCT827CTQC denotes the commercial-speed grade (4.4 ns max tPLH/tPHL at CL = 50 pF), distinguishing it from the "A" grade (8 ns) and military "54" variants. This speed bin enables use in faster data paths - such as 25-MHz address latching or 10-MHz control bus extension - while maintaining FCT-family noise immunity and power efficiency. The "TQC" suffix confirms QSOP-24 packaging with green RoHS compliance and moisture sensitivity level 2.