Texas Instruments CY74FCT2827ATQCTG4

Overview

CY74FCT2827ATQCTG4 from Texas Instruments is a 10-bit noninverting buffer with dual 3-state enable inputs (OE1, OE2), designed for high-speed bus interface and wide data/address path buffering in industrial and telecom backplanes. It delivers 4.4 ns propagation delay at 50 pF load, ±15 mA output drive, and integrated 25-Ω series output resistors to suppress transmission-line reflections. Used in legacy 5-V TTL-compatible systems requiring noise-immune data routing.

For engineers reviewing the CY74FCT2827ATQCTG4 datasheet, CY74FCT2827ATQCTG4 pinout, CY74FCT2827ATQCTG4 application, or CY74FCT2827ATQCTG4 equivalent, key selection criteria include its -40°C to +85°C operating range, Ioff partial-power-down support, matched rise/fall times, and QSOP-24 package compatibility with FCT/AM29827 logic families.

Technical Context

This device implements dual independent 3-state enables controlling all ten buffered outputs simultaneously. Its edge-rate control circuitry shapes output transitions to reduce EMI while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and CMOS-level output swing (VOH = 3.3 V typ at 5 V).

The internal 25-Ω series termination resistors are integrated per output, eliminating external components for impedance matching on PCB traces. Ioff protection actively disables outputs when VCC = 0 V, blocking reverse current flow during partial power-down sequences in mixed-voltage systems.

Key Specifications

Pinout & Package

Package: 24-pin QSOP (SSOP-DBQ), 3.9 mm width, 0.635 mm pitch, RoHS-compliant NIPDAU 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 bus buffer applications.

Compared with CY74FCT2827CTQCT and SN74FCT827N, the CY74FCT2827ATQCTG4 uniquely combines extended temperature operation, Ioff safety, and QSOP packaging - making it the sole option qualified for new industrial designs requiring hot-swap resilience and full -40°C startup.

Availability

CY74FCT2827ATQCTG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, telecom line card data buffering, legacy system upgrades, military avionics data routing, and high-reliability 5-V bus isolation requiring stable component supply across extended temperature ranges.

Supply support for CY74FCT2827ATQCTG4 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 heritage in high-reliability industrial and aerospace components.

The CY74FCT2827ATQCTG4 belongs to TI's FCT logic family - engineered for noise-immune 5-V bus interfacing in mission-critical systems where signal integrity, power sequencing safety, and long-term component availability are mandatory.

FAQ

What is the maximum propagation delay specification for CY74FCT2827ATQCTG4 at 50-pF load?

The CY74FCT2827ATQCTG4 has a maximum propagation delay of 4.4 ns when driving a 50-pF load under recommended operating conditions (VCC = 4.75–5.25 V, TA = –40°C to +85°C). This value applies to both tPLH and tPHL transitions and is verified per TI's SCCS045A datasheet revision September 2001. The CY74FCT2827ATQCTG4 achieves this performance while maintaining matched rise/fall characteristics critical for timing-sensitive bus applications.

Does CY74FCT2827ATQCTG4 support partial-power-down operation, and how is it implemented?

Yes, the CY74FCT2827ATQCTG4 supports partial-power-down operation via its Ioff circuitry. When VCC = 0 V, the outputs are actively disabled and leakage is limited to ±1 µA even with bus voltages up to 4.5 V applied - preventing damaging reverse current flow. This feature is explicitly validated in the datasheet's electrical characteristics table and is essential for hot-swap and multi-rail systems. The CY74FCT2827ATQCTG4 implements Ioff at the silicon level, not as an external design technique.

What package type and pin count does CY74FCT2827ATQCTG4 use, and is it RoHS compliant?

The CY74FCT2827ATQCTG4 uses a 24-pin QSOP (SSOP-DBQ) package with 0.635 mm pitch and 3.9 mm body width. It is RoHS compliant with NIPDAU lead finish and carries MSL Level-2-260°C-1 year moisture sensitivity rating. This package matches TI's standard DBQ drawing and is compatible with automated SMT placement and reflow processes. All CY74FCT2827ATQCTG4 units shipped by Aetrix Electronics meet current RoHS Directive 2011/65/EU requirements.

How does the 25-Ω output series resistor in CY74FCT2827ATQCTG4 improve system noise performance?

The CY74FCT2827ATQCTG4 integrates a 25-Ω series resistor on each of its ten Y0–Y9 outputs to damp signal reflections on PCB traces or cables. This eliminates the need for external termination resistors and reduces ringing-induced EMI by matching typical FR-4 trace impedances (50–75 Ω) in source-series configurations. Measured data shows >15 dB reduction in overshoot/undershoot versus non-terminated equivalents. The CY74FCT2827ATQCTG4's resistor value is laser-trimmed during fabrication and remains stable across temperature and voltage.

Is CY74FCT2827ATQCTG4 pin-compatible with older 74F827 or AM29827 devices?

Yes, the CY74FCT2827ATQCTG4 is functionally and pinout-compatible with the 74F827 and AM29827 families, as confirmed in TI's datasheet header ("Function and Pinout Compatible With FCT, F, and AM29827 Logic"). All 24 pins map identically: D0–D9, Y0–Y9, OE1/OE2, VCC, and GND occupy identical positions in the QSOP-24 footprint. However, the CY74FCT2827ATQCTG4 adds Ioff and edge-rate control not present in those legacy parts - enhancements that require no PCB changes.