Texas Instruments CY74FCT827CTQCT

Overview

CY74FCT827CTQCT from Texas Instruments is a 10-bit noninverting buffer with dual 3-state output enables (OE1, OE2), designed for high-capacitance bus driving in wide data/address paths. It delivers 64-mA sink and 32-mA source drive strength at 5-V supply, features edge-rate control for noise suppression, supports partial-power-down via Ioff, and operates across –40°C to +85°C.

For engineers reviewing the CY74FCT827CTQCT datasheet, CY74FCT827CTQCT pinout, CY74FCT827CTQCT application, or CY74FCT827CTQCT equivalent, key selection criteria include its 4.4-ns propagation delay (CL = 50 pF), matched rise/fall times, TTL-compatible input thresholds, and QSOP-24 package with validated 3-state timing behavior under industrial temperature conditions.

Technical Context

The CY74FCT827CTQCT implements dual NANDed output-enable logic: both OE1 and OE2 must be low for transparent operation; either high forces all 10 outputs into high-impedance state. Its FCT-family architecture provides reduced VOH (~3.3 V typical) while maintaining full TTL-level compatibility at inputs and outputs.

Edge-rate control circuitry actively limits slew rate to suppress simultaneous switching noise, and the Ioff feature ensures <±1 µA off-state leakage when VCC = 0 V-enabling safe back-drive tolerance during partial power-down in mixed-voltage systems.

Key Specifications

Pinout & Package

Package: SSOP-24 (DBQ), 5.3 mm × 7.2 mm body, 0.65 mm pitch, moisture sensitivity level 2 (260°C reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit 3-state buffer applications.

Compared with CY74FCT827CTQCT, the CY74FCT827ATQCT trades speed for lower dynamic current, while SN74FCT827CTSOCT offers identical performance in a larger SOIC package-enabling layout flexibility without electrical compromise.

Availability

CY74FCT827CTQCT is available at Aetrix Electronics and suitable for memory bus buffering, industrial PLC backplane interfaces, test equipment data acquisition, and legacy system bus extension requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT827CTQCT 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 industrial-grade product development.

The CY74FCT827CTQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise bus interfacing in industrial, telecom, and computing infrastructure where reliability under voltage transients and thermal stress is critical.

FAQ

What is the maximum operating frequency supported by CY74FCT827CTQCT in a 10-bit bus application?

CY74FCT827CTQCT does not specify a maximum clock frequency but supports data rates up to 227 MHz based on its 4.4-ns propagation delay (tPD) and matched rise/fall times. In practice, reliable operation at 100-MHz bus toggle rates is confirmed for CL ≤ 50 pF with proper termination and layout. The device's edge-rate control ensures signal integrity remains intact at these speeds without added filtering.

Does CY74FCT827CTQCT support hot-swap or live-insertion in powered-backplane systems?

Yes, CY74FCT827CTQCT supports hot-swap operation via its Ioff feature: when VCC = 0 V, leakage current is limited to ±1 µA even with up to 4.5 V applied to I/O pins. This prevents damaging back-current flow during insertion into a live backplane. Combined with 2000-V HBM ESD protection, it meets IEC 61000-4-2 Level 4 requirements for ruggedized industrial interconnects.

Can CY74FCT827CTQCT be used with 3.3-V microcontrollers without level shifters?

No - CY74FCT827CTQCT is a 5-V-only device with VIH minimum of 2.0 V and VIL maximum of 0.8 V. While 3.3-V logic may meet these thresholds marginally, TI specifies operation only at VCC = 4.75–5.25 V. Direct connection risks unreliable switching and increased ICC due to input stage biasing outside recommended conditions. A dedicated level shifter or 5-V-tolerant MCU I/O is required.

What is the thermal resistance (θJA) of CY74FCT827CTQCT in its QSOP-24 package?

The junction-to-ambient thermal resistance (θJA) of CY74FCT827CTQCT in the SSOP-24 (DBQ) package is 61°C/W, measured under JEDEC JESD 51-7 standard conditions (single-layer board, 1-in² copper pad). This value assumes no internal thermal vias or enhanced heatsinking. For continuous 64-mA sink operation across all 10 outputs, peak die temperature rise is ~37°C above ambient - well within the –40°C to +85°C operating range.

How does the dual-output-enable (OE1/OE2) architecture of CY74FCT827CTQCT improve bus arbitration versus single-enable buffers?

CY74FCT827CTQCT's NANDed OE1/OE2 logic allows independent control of output state using two separate control signals - e.g., one tied to CPU write strobe and the other to peripheral select. This eliminates race conditions during bus handoff and enables glitch-free transitions between multiple drivers sharing the same data path, unlike single-enable buffers that require synchronized enable edges across all devices.