Texas Instruments CY74FCT827CTQCTG4

Overview

CY74FCT827CTQCTG4 from Texas Instruments is a 10-bit noninverting bus buffer with dual 3-state output enables (OE1, OE2), designed for high-capacitance-load data/address bus interfacing in industrial and telecom backplanes. It delivers 64-mA sink / 32-mA source drive strength, 4.4-ns propagation delay (CL = 50 pF), and operates at 4.75–5.25 V. Its Ioff protection enables partial-power-down operation in mixed-voltage systems.

For engineers reviewing the CY74FCT827CTQCTG4 datasheet, CY74FCT827CTQCTG4 pinout, CY74FCT827CTQCTG4 application, or CY74FCT827CTQCTG4 equivalent, key selection criteria include 3-state timing symmetry (matched tPLH/tPHL), edge-rate-controlled outputs for noise reduction, TTL-compatible input thresholds, and QSOP-24 package suitability for space-constrained board layouts.

Technical Context

The CY74FCT827CTQCTG4 implements dual independent 3-state enable logic (OE1 and OE2 NANDed) to control all 10 Y outputs simultaneously, supporting flexible bus arbitration schemes. Its FCT-family silicon ensures full TTL-level compatibility on both inputs and outputs while maintaining CMOS-like low input current (±1 µA).

Edge-rate control circuitry limits di/dt to suppress simultaneous switching noise, and the Ioff feature actively disables outputs when VCC = 0 V-blocking reverse current flow during hot-insertion or partial power-down sequences without requiring external isolation components.

Key Specifications

Pinout & Package

Package: QSOP-24 (DBQ), 3.9-mm body width, 0.635-mm pitch, RoHS-compliant NiPdAu lead 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 3-state buffer applications.

Compared with SN74FCT827CTSOCT, CY74FCT827CTQCTG4 saves board space in high-density systems but requires tighter thermal management; versus 74AC11010N, it adds critical Ioff and edge-rate features essential for modern hot-swap and EMI-sensitive applications.

Availability

CY74FCT827CTQCTG4 is available at Aetrix Electronics and suitable for telecom backplane interfaces, industrial PLC I/O expansion, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY74FCT827CTQCTG4 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 CY74FCT827CTQCTG4 belongs to TI's FCT logic family, engineered for high-speed, low-noise bus interfacing in mixed-voltage systems where reliability, ESD robustness, and partial-power-down operation are mandatory.

FAQ

What is the maximum operating temperature range for CY74FCT827CTQCTG4?

CY74FCT827CTQCTG4 is rated for –40°C to +85°C ambient operation, validated per TI's production test flow for industrial applications. This range covers typical operating conditions in enclosed control cabinets, telecom line cards, and factory-floor automation equipment where airflow is limited and ambient temperatures may exceed commercial-grade limits.

Does CY74FCT827CTQCTG4 support hot-swap insertion?

Yes, CY74FCT827CTQCTG4 supports hot-swap insertion via its Ioff feature: when VCC = 0 V, output leakage is limited to ±1 µA, preventing damaging current backflow from live backplane traces into the unpowered device. This eliminates the need for external blocking FETs in modular system architectures.

How does the dual-output-enable (OE1/OE2) logic work in CY74FCT827CTQCTG4?

In CY74FCT827CTQCTG4, OE1 and OE2 are internally NANDed-both must be low to enable outputs (Y0–Y9). If either OE1 or OE2 is high, all outputs enter high-impedance state. This architecture allows hierarchical control (e.g., OE1 from system controller, OE2 from local module) or redundancy (either signal can disable the bus).

Can CY74FCT827CTQCTG4 drive a 100-pF bus load while maintaining signal integrity?

Yes, CY74FCT827CTQCTG4 is explicitly characterized for high-capacitance loads: its 64-mA sink / 32-mA source drive strength ensures clean edges even at CL = 300 pF (tPHL/tPLH ≤ 10 ns). At 100 pF, rise/fall times remain tightly matched (<0.3 ns skew), preserving setup/hold margins in synchronous bus protocols.

Is CY74FCT827CTQCTG4 pin-compatible with older 74FCT827 variants?

CY74FCT827CTQCTG4 shares identical pinout, function table, and DC/AC specifications with CY74FCT827T and CY74FCT827AT in QSOP-24 (DBQ) packaging. The "C" speed grade (4.4 ns) supersedes the "A" (8 ns) and "T" (9 ns) versions, offering improved timing margin without layout changes.