Texas Instruments CY74FCT2827ATQCT

Overview

CY74FCT2827ATQCT from Texas Instruments is a 10-bit noninverting buffer with dual 3-state enable inputs (OE1, OE2), designed for high-capacitance bus interfacing in wide data/address paths. It delivers 15-mA source / 12-mA sink drive, 25-Ω integrated output series resistors, and operates at 5 V with –40°C to 85°C temperature range. Used in backplane and memory subsystem buffering where noise reduction and partial-power-down support are critical.

For engineers reviewing the CY74FCT2827ATQCT datasheet, CY74FCT2827ATQCT pinout, CY74FCT2827ATQCT application, or CY74FCT2827ATQCT equivalent, key selection criteria include its 8 ns max propagation delay (CL = 50 pF), Ioff-enabled partial-power-down capability, TTL-compatible input thresholds, and QSOP-24 package with matched rise/fall times for EMI-sensitive digital systems.

Technical Context

This device implements dual independent 3-state enables controlling all 10 outputs simultaneously, supporting NANDed logic for flexible bus arbitration. Its edge-rate control circuitry and on-die 20–40 Ω output series termination suppress transmission-line reflections without external resistors.

The Ioff feature actively disables outputs when VCC = 0 V, blocking reverse current flow during hot-insertion or partial system power-down. Input clamp diodes and low 5–10 pF input capacitance minimize loading on upstream drivers while maintaining full TTL-level compatibility.

Key Specifications

Pinout & Package

Package: SSOP-24 (DBQ), 0.154" body width, 0.025" lead pitch - surface-mount compatible with standard reflow profiles (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 SN74FCT2827ATPWR and 74ACT2827SC, the CY74FCT2827ATQCT offers optimal balance of noise suppression (edge-rate control + 25-Ω termination), hot-swap safety (Ioff), and industrial temperature range - making it the preferred choice for new designs requiring reliability in electrically noisy or modular environments.

Availability

CY74FCT2827ATQCT is available at Aetrix Electronics and suitable for memory subsystem buffering, backplane data bus interface, and industrial PLC I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY74FCT2827ATQCT 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 CY74FCT family targets high-speed, low-noise 5 V logic interfacing - specifically engineered for bus buffering, level translation, and noise-critical applications in industrial and telecom infrastructure.

FAQ

What is the maximum operating frequency supported by CY74FCT2827ATQCT?

CY74FCT2827ATQCT does not specify a maximum clock frequency directly, but its 8 ns maximum propagation delay (tPLH/tPHL at CL = 50 pF) supports reliable operation in systems with data rates up to approximately 125 MHz for single-edge signaling. Actual usable frequency depends on trace length, load capacitance, and system timing margins - design validation with worst-case delay and skew analysis is recommended before deployment.

Does CY74FCT2827ATQCT support hot-swap or partial-power-down operation?

Yes, CY74FCT2827ATQCT supports partial-power-down via its Ioff feature: when VCC = 0 V, output leakage is limited to ±1 µA, preventing damaging reverse current flow during live insertion or mixed-rail sequencing. This makes CY74FCT2827ATQCT suitable for modular backplanes and hot-pluggable I/O carriers where upstream logic remains powered while the buffer is unpowered.

What is the purpose of the dual OE inputs (OE1 and OE2) on CY74FCT2827ATQCT?

The dual OE inputs (pins 1 and 23) implement NAND logic: both must be low to enable outputs. This allows flexible bus control - e.g., one OE can be tied to system enable while the other connects to a local channel select, enabling hierarchical bus arbitration. Unlike single-OE buffers, CY74FCT2827ATQCT avoids unintended output glitches during asynchronous enable transitions, improving system-level reliability in multi-master environments.

Can CY74FCT2827ATQCT replace CY74FCT827T in an existing design?

Yes, CY74FCT2827ATQCT is explicitly documented as a drop-in replacement for CY74FCT827T to reduce noise - sharing identical pinout, function table, and DC specifications. Key improvements include enhanced edge-rate control, tighter VOH (3.3 V typical), and stronger ESD ratings. No PCB changes are required, though layout review for improved decoupling near VCC (pin 24) is advised to maximize noise suppression benefits of CY74FCT2827ATQCT.

What package type and moisture sensitivity level does CY74FCT2827ATQCT use?

CY74FCT2827ATQCT uses a 24-pin SSOP (DBQ) package with 0.154" body width and 0.025" lead pitch. It carries a Moisture Sensitivity Level (MSL) rating of Level-2-260°C-1 year per JEDEC J-STD-020, meaning it may be stored up to 1 year at ≤30°C/60% RH and requires bake-out only if exposed beyond that limit or after opening dry pack. Reel packaging is 2500 units per large tape-and-reel.