Texas Instruments CY74FCT2827CTQCT

Overview

CY74FCT2827CTQCT from Texas Instruments is a 10-bit noninverting buffer with dual 3-state enable inputs (OE1, OE2), designed for high-speed bus interface in wide data/address paths and parity buses. It delivers 4.4 ns propagation delay (CL = 50 pF), 25-Ω integrated output series resistance, and TTL-compatible I/O levels (VIH = 2 V, VOL = 0.55 V) for noise-suppressed signal routing in industrial backplanes and memory subsystems.

For engineers reviewing the CY74FCT2827CTQCT datasheet, CY74FCT2827CTQCT pinout, CY74FCT2827CTQCT application, or CY74FCT2827CTQCT equivalent, key selection criteria include its dual-OE control logic, Ioff partial-power-down support, matched rise/fall times, and QSOP-24 package compatibility with legacy FCT/AM29827 designs.

Technical Context

This device implements edge-rate control circuitry to suppress transmission-line reflections and features on-die 20–40 Ω output series resistors. Its dual NANDed enable architecture allows independent or combined gating of all 10 outputs, supporting flexible bus arbitration schemes in multi-master systems.

The Ioff specification (±1 µA at VCC = 0 V, VOUT = 4.5 V) enables safe operation during partial power-down, preventing backflow current when VCC is unpowered while other system rails remain active. All inputs include clamp diodes and exhibit low input capacitance (Ci = 10 pF), minimizing loading on upstream drivers.

Key Specifications

Pinout & Package

Package: SSOP-24 (DBQ), 0.154" body width, 0.025" lead 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 CY74FCT2827ATQCT and SN74FCT827CTSO, the CY74FCT2827CTQCT provides optimal balance of speed (4.4 ns), power-down safety (Ioff), and noise control (integrated 25-Ω resistors), making it preferred for new industrial designs requiring robust bus interfacing.

Availability

CY74FCT2827CTQCT is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem buffering, and legacy logic upgrades requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for CY74FCT2827CTQCT 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 automotive ICs.

The CY74FCT2827CTQCT belongs to TI's FCT logic family, engineered for noise-immune 5 V bus interfacing in industrial control, telecommunications infrastructure, and legacy system modernization.

FAQ

What is the maximum operating frequency supported by CY74FCT2827CTQCT?

The CY74FCT2827CTQCT does not specify a maximum clock frequency, but its 4.4 ns propagation delay (tPLH/tPHL) and 5.7 ns enable/disable times establish a practical limit of approximately 227 MHz for data valid windows in synchronous bus applications. Actual usable frequency depends on system-level trace length, load capacitance, and timing margin requirements; for CL = 50 pF, the device reliably supports 20–50 MHz parallel bus rates in industrial backplanes.

Does CY74FCT2827CTQCT support hot-swap or partial-power-down operation?

Yes, CY74FCT2827CTQCT supports partial-power-down via its Ioff feature: when VCC = 0 V, leakage current is limited to ±1 µA even with up to 4.5 V applied to any I/O pin. This prevents damaging current backflow during live insertion into powered backplanes, making CY74FCT2827CTQCT suitable for modular industrial systems requiring field-replaceable units without full system shutdown.

How does the dual-OE architecture of CY74FCT2827CTQCT differ from single-OE buffers?

CY74FCT2827CTQCT uses NANDed OE1 and OE2 inputs: both must be low to enable outputs, providing OR-style bus arbitration where either OE high forces all Y0–Y9 into high-impedance. This enables hierarchical control-e.g., OE1 from system controller, OE2 from local module-allowing CY74FCT2827CTQCT to isolate sub-buses during diagnostics or fault conditions without modifying upstream logic.

Can CY74FCT2827CTQCT replace CY74FCT827T in existing designs?

Yes, CY74FCT2827CTQCT is explicitly documented as a drop-in replacement for CY74FCT827T, sharing identical QSOP-24 pinout, function table, and DC specifications. The CY74FCT2827CTQCT improves upon the older part with faster 4.4 ns propagation delay (vs. 8 ns), enhanced noise suppression via edge-rate control, and tighter VOH/VOL tolerances-requiring no PCB changes while improving signal integrity in deployed systems.

What is the purpose of the 25-Ω output series resistance in CY74FCT2827CTQCT?

The 20–40 Ω (typical 25 Ω) output series resistance in CY74FCT2827CTQCT is integrated to dampen transmission-line reflections on PCB traces, particularly in unterminated or long (>10 cm) parallel buses. By matching typical FR-4 trace impedance (50–75 Ω), this resistor reduces ringing and overshoot, lowering EMI emissions and improving signal eye diagrams-eliminating the need for discrete 25–33 Ω resistors per line in CY74FCT2827CTQCT-based designs.