Texas Instruments 74FCT162827ATPACT

Overview

74FCT162827ATPACT from Texas Instruments is a 20-bit non-inverting 3-state buffer/line driver with dual 10-bit sections, balanced 24 mA output drivers, I_off partial-power-down support, and TSSOP-56 packaging. It operates at 5V ±10%, delivers typical VOL < 0.55 V at 24 mA sink, and targets high-speed bus interface applications in industrial backplanes and transmission-line-driven systems.

For engineers reviewing the 74FCT162827ATPACT datasheet, 74FCT162827ATPACT pinout, 74FCT162827ATPACT application, or 74FCT162827ATPACT equivalent, key selection criteria include propagation delay (≤5.0 ns @ 50 pF), output skew (<0.5 ns), ground bounce performance (<0.6 V), and compatibility with 5V TTL/CMOS logic families in noise-sensitive wide-bus environments.

Technical Context

The 74FCT162827ATPACT implements two independent 10-bit buffer sections, each with NANDed OE1/OE2 inputs enabling flexible enable control per section. Its balanced 24 mA output drivers integrate current-limiting resistors to reduce external termination needs and suppress undershoot.

Designed for transmission-line driving, it features edge-rate control circuitry that minimizes system switching noise and ensures stable operation across −40°C to +85°C. The I_off circuitry actively disables outputs during power-down to prevent backflow current, supporting hot-insertion and partial-power-down architectures.

Key Specifications

Pinout & Package

74FCT162827ATPACT is housed in a 56-pin Thin Shrunk Small Outline Package (TSSOP-DGG), 13.9 mm × 7.9 mm × 1.2 mm max height, 0.5 mm pitch, JEDEC MO-153 compliant. Pin 1 marked via corner chamfer; seating plane defined per JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 20-bit buffer/line driver applications.

Compared with CY74FCT162827CTPACT, the 74FCT162827ATPACT trades 0.8 ns of timing margin for broader availability and mature qualification; versus 74FCT162827ATPVCT, it offers 23% smaller PCB area and improved high-frequency signal integrity due to reduced lead inductance.

Availability

74FCT162827ATPACT is available at Aetrix Electronics and suitable for industrial control systems, high-speed backplane interfaces, and hot-swappable module designs requiring stable component supply, long-term lifecycle support, and guaranteed 5V-tolerant bus buffering.

Supply support for 74FCT162827ATPACT 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 IC design.

The FCT logic family-including 74FCT162827ATPACT-is engineered for robust 5V bus interfacing in electrically noisy, thermally demanding environments, emphasizing low ground bounce, precise timing, and power-down safety.

FAQ

What is the maximum clock frequency supported by the 74FCT162827ATPACT in a 20-bit bus application?

The 74FCT162827ATPACT is not a clocked device but a combinational buffer; its usable data rate depends on propagation delay and load. With 5.0 ns max t_PLH/t_PHL into 50 pF and 50 Ω, it reliably supports 100–125 Mbps NRZ data on properly terminated lines. System-level timing must account for board trace delays and receiver setup/hold windows. The 74FCT162827ATPACT itself imposes no inherent clock limit beyond its specified AC characteristics.

Does the 74FCT162827ATPACT support mixed-voltage operation (e.g., 3.3V inputs with 5V VCC)?

No-the 74FCT162827ATPACT is a 5V-only device. Its input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and absolute maximum ratings (−0.5 V to +7.0 V on inputs) allow direct connection to 3.3V CMOS outputs, but TI does not guarantee interoperability outside the 5V VCC domain. For guaranteed 3.3V–5V translation, use a dedicated level shifter; the 74FCT162827ATPACT functions correctly only with 5V VCC and 5V-compatible logic families.

How does the I_off feature of the 74FCT162827ATPACT behave during partial power-down?

When VCC drops to 0 V, the I_off circuitry in the 74FCT162827ATPACT forces all 20 outputs into high-impedance state regardless of OE or input states, blocking current flow up to ±1 µA. This prevents back-driving of powered-down sections and meets JEDEC JESD78 latch-up immunity requirements. The 74FCT162827ATPACT remains safe for hot-swap use as long as input voltages stay within −0.5 V to +7.0 V during power transitions.

Can the 74FCT162827ATPACT be used as two independent 10-bit buffers, and how are the enables configured?

Yes-the 74FCT162827ATPACT contains two functionally independent 10-bit sections (1A/1Y and 2A/2Y), each with its own pair of active-low enables: 1OE1/1OE2 for Section 1 and 2OE1/2OE2 for Section 2. The enables are NANDed internally, so both must be LOW to activate the corresponding 10-bit outputs. This allows independent gating of each half-bus without external logic, simplifying control in split-data-path architectures.

What is the thermal performance of the 74FCT162827ATPACT in continuous 24 mA switching operation?

In worst-case conditions (all 20 outputs sinking 24 mA simultaneously at +85°C), the 74FCT162827ATPACT dissipates ≤350 mW. Its TSSOP-56 package has a typical θ_JA of 110°C/W, resulting in ~40°C junction rise above ambient-well within the 125°C max rating. No heatsink is required; standard 2 oz copper with 2–4 thermal vias per GND/VCC pin ensures reliable operation under full load.