Texas Instruments 74FCT162646ATPACT

Overview

74FCT162646ATPACT from Texas Instruments is a 16-bit registered transceiver with balanced 24 mA output drivers, I_off partial-power-down support, and industrial-grade operation (−40°C to +85°C) at V_CC = 5 V ± 10%. It enables bidirectional data multiplexing between A and B buses via clocked registers, direction control (DIR), and active-low output enable (OE), serving as a high-noise-immunity bus interface in backplane and transmission-line systems.

For engineers reviewing the 74FCT162646ATPACT datasheet, 74FCT162646ATPACT pinout, 74FCT162646ATPACT application, or 74FCT162646ATPACT equivalent, key selection criteria include its 6.3 ns max propagation delay (bus-to-bus), <0.6 V typical ground bounce (VOLP), TSSOP-56 package with 0.5 mm pitch, and compatibility with 5-V TTL/CMOS logic families in high-speed digital interconnects.

Technical Context

This device implements dual 16-bit D-type register banks (A and B), with independent clock inputs CLKAB and CLKBA for latching data from either bus into the opposite register. Control logic uses DIR to define data flow direction and OE (active low) to place outputs in high-impedance state - enabling isolation, real-time pass-through, or stored-data transfer modes.

Its balanced 24 mA drivers incorporate internal current-limiting resistors, reducing external termination needs and minimizing undershoot and ground bounce. The I_off circuitry disables outputs when V_CC = 0 V, preventing backflow current during partial power-down - critical for hot-swap and mixed-voltage system designs.

Key Specifications

Pinout & Package

74FCT162646ATPACT is housed in a 56-pin Thin Shrunk Small Outline Package (TSSOP), JEDEC MO-153 compliant, with 0.5 mm lead pitch, 13.9–14.1 mm body width, and 1.2 mm max height - optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit registered transceiver applications.

Compared with CY74FCT162646ATPVC and 74FCT162646CTPACT, the 74FCT162646ATPACT offers optimal balance of compact TSSOP packaging, 6.3 ns timing, and low-noise 24 mA drive - making it preferred for high-density, noise-sensitive transmission-line interfaces where layout area and EMI control are primary constraints.

Availability

74FCT162646ATPACT is available at Aetrix Electronics and suitable for industrial backplane interfacing, high-speed data multiplexing, and hot-swappable module design requiring stable component supply, RoHS-compliant green packaging, and full lifecycle traceability.

Supply support for 74FCT162646ATPACT 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 expertise in high-reliability industrial and automotive ICs.

The 74FCT162646ATPACT belongs to TI's FCT logic family - engineered for 5-V systems demanding low ground bounce, precise timing control, and robust partial-power-down behavior in mission-critical digital interconnects.

FAQ

What is the maximum clock frequency supported by the 74FCT162646ATPACT?

The 74FCT162646ATPACT does not specify a maximum clock frequency in its datasheet; instead, it guarantees a minimum clock pulse width of 5.0 ns (HIGH or LOW) and propagation delays down to 1.5 ns. Based on these timing parameters, reliable operation is achievable at clock rates exceeding 100 MHz in well-terminated systems with adequate setup/hold margins.

Does the 74FCT162646ATPACT support 3.3-V input logic levels?

Yes, the 74FCT162646ATPACT accepts 3.3-V TTL-compatible inputs: its V_IL is 0.8 V max and V_IH is 2.0 V min, ensuring reliable recognition of 3.3-V logic HIGH and LOW signals when operated at V_CC = 5 V - enabling seamless interfacing with mixed-voltage FPGA or microcontroller I/O.

How does the I_off feature function in the 74FCT162646ATPACT?

The I_off circuitry in the 74FCT162646ATPACT automatically disables all outputs when V_CC drops to 0 V, blocking reverse current flow from powered buses into the unpowered device. This protects upstream drivers and maintains system stability during partial power-down - a requirement in hot-swap and modular power architectures.

Can the 74FCT162646ATPACT operate in transparent mode without latching data?

Yes, the 74FCT162646ATPACT supports transparent (real-time) data transfer: when OE is LOW and DIR is set, data passes directly from the selected input bus (A or B) to the output bus without registration - provided the appropriate SAB/SBA select inputs are asserted and clocks remain static.

What is the thermal resistance (θ_JA) of the 74FCT162646ATPACT in its TSSOP package?

The datasheet does not publish θ_JA for the 74FCT162646ATPACT specifically; however, TI's generic TSSOP-56 (DGG) package exhibits θ_JA ≈ 110°C/W under standard JEDEC JESD51-2 conditions (single-layer copper, 1-in² pad). For thermal design, assume worst-case power dissipation of 1.7 mA × 5 V = 8.5 mW (quiescent) plus dynamic contributions - resulting in negligible junction rise under typical operating conditions.