Texas Instruments CY74FCT827CTSOC

Overview

CY74FCT827CTSOC from Texas Instruments is a 10-bit noninverting bus buffer with dual 3-state outputs, designed for high-capacitance-load drive in wide data/address buses and parity paths. It delivers 64-mA sink / 32-mA source drive, 4.4-ns propagation delay (CL = 50 pF), and operates across –40°C to +85°C with 4.75–5.25-V supply.

For engineers reviewing the CY74FCT827CTSOC datasheet, CY74FCT827CTSOC pinout, CY74FCT827CTSOC application, or CY74FCT827CTSOC equivalent, key selection criteria include Ioff-enabled partial-power-down support, matched rise/fall times, edge-rate control for noise reduction, TTL-compatible logic levels, and SOIC-24 package compatibility with industrial bus interface designs.

Technical Context

The CY74FCT827CTSOC implements dual NAND-gated output enables (OE1 and OE2) for flexible 3-state control of all ten Y outputs. Its FCT-family architecture ensures function, pinout, and drive compatibility with CY54FCT827T, AM29827, and standard F/FAST logic families.

It integrates edge-rate control circuitry to suppress switching noise and features Ioff protection that disables outputs and blocks reverse current during partial power-down. Input and output capacitances are minimized (Ci = 5–10 pF, Co = 9–12 pF) to reduce bus loading in active and high-Z states.

Key Specifications

Pinout & Package

Package: SOIC-24 (DW), 7.5 mm × 15.4 mm body, 1.27 mm pitch, RoHS-compliant NIPDAU lead finish, MSL Level-1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY74FCT827ATSOC, the CY74FCT827CTSOC offers 39% faster propagation (4.4 ns vs. 8 ns), enabling higher bus clock rates; versus SN74FCT244NSR, it provides native 10-bit width and integrated dual-OE logic-reducing component count and simplifying control logic in wide-bus systems.

Availability

CY74FCT827CTSOC is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, backplane data bus interfacing, and memory address latching requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for CY74FCT827CTSOC 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 industrial-grade product validation.

The CY74FCT827CTSOC belongs to TI's FCT logic family, engineered for high-noise-immunity 5-V bus interfacing in industrial, telecom, and computing infrastructure where reliability, timing precision, and power sequencing safety are critical.

FAQ

What is the maximum operating frequency supported by the CY74FCT827CTSOC?

The CY74FCT827CTSOC does not specify a maximum clock frequency directly, but its 4.4-ns propagation delay (tPLH/tPHL) at CL = 50 pF implies reliable operation up to approximately 200 MHz for single-cycle data transfers. Actual usable frequency depends on system-level trace capacitance, termination, and setup/hold margins - design validation is recommended for >100-MHz bus applications using CY74FCT827CTSOC.

Does the CY74FCT827CTSOC support hot-swap or partial-power-down operation?

Yes, the CY74FCT827CTSOC includes Ioff circuitry that actively disables outputs when VCC = 0 V, limiting reverse current to ±1 µA. This feature enables safe partial-power-down operation and protects against backfeeding in hot-swap systems - a key differentiator from standard TTL or F logic buffers and essential for robust CY74FCT827CTSOC deployment in modular industrial hardware.

What are the absolute maximum ratings for the CY74FCT827CTSOC supply voltage and I/O pins?

The CY74FCT827CTSOC has an absolute maximum supply voltage of –0.5 V to 7 V, and DC input/output voltage range of –0.5 V to 7 V. Exceeding these limits risks permanent damage. Recommended operation is strictly 4.75–5.25 V for VCC, with input voltages referenced to GND and compliant with TTL thresholds (0.8 V low, 2.0 V high). These ratings ensure CY74FCT827CTSOC robustness in transient-prone industrial environments.

How does the dual-output-enable (OE1/OE2) logic work on the CY74FCT827CTSOC?

The CY74FCT827CTSOC uses NANDed enable logic: both OE1 and OE2 must be low to enable Y0–Y9 outputs. If either OE1 or OE2 is high, all outputs enter high-impedance state. This architecture allows flexible bus control - e.g., OE1 tied to system enable and OE2 to local card select - enabling hierarchical bus arbitration without external logic. This behavior is confirmed in the CY74FCT827CTSOC function table and distinguishes it from octal buffers with independent OE groups.

Is the CY74FCT827CTSOC pin-compatible with older 74F244 or 74AS244 devices?

No, the CY74FCT827CTSOC is not pin-compatible with 74F244 (octal, SOIC-20) or 74AS244 (octal, SOIC-20). It is a 10-bit device in SOIC-24 and shares pinout compatibility only with other CY74FCT827x variants (e.g., CY74FCT827ATSOC, CY74FCT827CTSOCT). Direct replacement requires PCB redesign; however, CY74FCT827CTSOC offers superior noise control, Ioff, and drive strength versus those legacy parts - making it a functional upgrade where layout revision is feasible.