Texas Instruments CY74FCT827ATSOCT

Overview

CY74FCT827ATSOCT from Texas Instruments is a 10-bit noninverting bus buffer with dual 3-state output enables (OE1, OE2), designed for high-capacitance-load data/address bus interfacing in industrial and telecom systems. It delivers 64-mA sink / 32-mA source drive strength, operates at 4.75–5.25 V, and features Ioff partial-power-down protection and edge-rate control for noise suppression.

For engineers reviewing the CY74FCT827ATSOCT datasheet, CY74FCT827ATSOCT pinout, CY74FCT827ATSOCT application, or CY74FCT827ATSOCT equivalent, key selection criteria include its 8-ns propagation delay (CL = 50 pF), matched rise/fall times, TTL-compatible input thresholds, and SOIC-24 package suitability for legacy board layouts requiring robust 5-V bus buffering.

Technical Context

The CY74FCT827ATSOCT implements dual NANDed output-enable logic (OE1 and OE2) to provide flexible 3-state control across all 10 Y outputs. Its FCT-family architecture ensures compatibility with TTL-level inputs and outputs while maintaining low input capacitance (5 pF) and low off-state output leakage (±1 µA at VCC = 0 V).

Edge-rate control circuitry actively limits slew rate to reduce simultaneous switching noise, and the Ioff feature disables outputs during power-down to prevent backflow current-critical for hot-swap and mixed-voltage system designs operating from –40°C to 85°C.

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 3-state buffer applications.

Compared with SN74FCT827ATSOCT and 74ACT1024N, the CY74FCT827ATSOCT uniquely combines Ioff protection, edge-rate control, and full industrial temperature/ESD compliance in a surface-mount SOIC-24 package-making it the sole choice for new designs requiring robust hot-swap capability and noise immunity.

Availability

CY74FCT827ATSOCT is available at Aetrix Electronics and suitable for telecom backplane interfaces, industrial PLC I/O expansion, and test equipment data acquisition requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for CY74FCT827ATSOCT 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 CY74FCT827ATSOCT belongs to TI's military- and industrial-grade FCT logic family, engineered for noise-immune, high-drive 5-V bus interfacing in mission-critical systems where signal integrity and power sequencing resilience are essential.

FAQ

What is the maximum clock frequency supported by CY74FCT827ATSOCT in a 10-bit bus application?

The CY74FCT827ATSOCT does not contain internal clock circuitry-it is a combinatorial buffer. Its usable data rate depends on propagation delay and load: with 8 ns max tPD and 50-pF load, it supports reliable 10-bit parallel transfers up to approximately 125 MHz (1/8 ns). System-level timing must account for board trace delays and setup/hold margins at the receiving device.

Does CY74FCT827ATSOCT support mixed-voltage operation, such as interfacing 3.3-V logic to 5-V buses?

No. The CY74FCT827ATSOCT is a 5-V-only device with VCC range 4.75–5.25 V. Its inputs are TTL-compatible (VIH = 2.0 V min), so 3.3-V CMOS outputs may not reliably assert high logic-external level-shifting or pull-up resistors are required. It does not tolerate input voltages exceeding VCC + 0.5 V per absolute maximum ratings.

How does the dual-output-enable (OE1/OE2) logic function in CY74FCT827ATSOCT?

In CY74FCT827ATSOCT, both OE1 and OE2 must be low for outputs Y0–Y9 to follow inputs D0–D9 (transparent mode). If either OE1 or OE2 is high, all outputs enter high-impedance state. This NANDed enable structure allows hierarchical bus control-for example, OE1 driven by system master, OE2 by local module enable-without additional logic gates.

Is CY74FCT827ATSOCT pin-compatible with CY74FCT827CTSOCT?

Yes. CY74FCT827ATSOCT and CY74FCT827CTSOCT share identical SOIC-24 pinout, footprint, and DC electrical specifications. The "A" suffix denotes 8-ns speed grade; "C" denotes faster 4.4-ns grade. Both operate over –40°C to 85°C and support Ioff, making them drop-in replacements where timing margin permits.

What thermal derating applies to CY74FCT827ATSOCT under continuous 64-mA output loading?

At TA = 85°C, SOIC-24 θJA = 46°C/W. With 64-mA sink at VOL = 0.55 V, power dissipation per output is ~35 mW. For all 10 outputs simultaneously active, worst-case junction temperature rise is ~16°C above ambient-well within 125°C Tj(max). No external heatsinking is required, but ensure ≥250 mm² copper pour under exposed pad (if present) per TI layout guidelines.