Texas Instruments 74FCT162H952ATPACT

Overview

74FCT162H952ATPACT from Texas Instruments is a 16-bit registered transceiver with bus-hold inputs, 24 mA balanced output drivers, 10 ns max propagation delay (CLK to B/A), industrial temperature range (–40°C to +85°C), and 5 V ±10% supply. It enables bidirectional data flow between two buses in high-noise digital systems such as backplane interconnects and memory expansion modules.

For engineers reviewing the 74FCT162H952ATPACT datasheet, 74FCT162H952ATPACT pinout, 74FCT162H952ATPACT application, or 74FCT162H952ATPACT equivalent, key selection criteria include bus-hold functionality eliminating external pull resistors, low ground bounce (<0.6 V), Ioff partial-power-down support, TSSOP-56 package compatibility, and 24 mA drive strength for transmission-line loading.

Technical Context

This device integrates two synchronized 8-bit registered transceivers sharing common control lines (CEAB/CEBA, CLKAB/CLKBA, OEAB/OEBA) to achieve full 16-bit operation. Its bus-hold circuitry actively retains the last valid logic state on each input when driven high-impedance, preventing floating nodes without external biasing.

The 74FCT162H952ATPACT uses edge-rate controlled outputs to minimize switching noise and ground bounce, with typical VOLP <0.6 V at VCC = 5 V and TA = 25°C. It supports partial-power-down via Ioff, disabling outputs and blocking reverse current when VCC = 0 V.

Key Specifications

Pinout & Package

74FCT162H952ATPACT is housed in a 56-pin Thin Shrunk Small Outline Package (TSSOP), JEDEC MO-153 compliant, with 0.5 mm pitch, 13.9 × 7.9 mm body size, and maximum 1.2 mm height - optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY74FCT162952BTPVC and 74FCT162H952CTPACT, the 74FCT162H952ATPACT offers optimal balance of cost, timing margin, and compact TSSOP packaging for industrial backplane and memory expansion use cases where 10 ns delay is acceptable.

Availability

74FCT162H952ATPACT is available at Aetrix Electronics and suitable for backplane interconnect, memory expansion module, and industrial PLC I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74FCT162H952ATPACT 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The 74FCT162H952ATPACT belongs to TI's FCT logic family, engineered for high-speed, low-noise, industrial-grade bus interfacing with integrated bus-hold and Ioff protection.

FAQ

What is the primary function of the 74FCT162H952ATPACT in a digital system?

The 74FCT162H952ATPACT functions as a 16-bit registered bidirectional transceiver that synchronizes and buffers data between two parallel buses using independent clock and enable controls for A-to-B and B-to-A directions. Its bus-hold inputs eliminate external pull resistors, and its Ioff feature supports partial-power-down operation - making it ideal for industrial backplane and memory expansion applications where signal integrity and power sequencing matter.

Does the 74FCT162H952ATPACT require external pull-up or pull-down resistors on its data inputs?

No, the 74FCT162H952ATPACT does not require external pull-up or pull-down resistors because it integrates bus-hold circuitry on all A- and B-side data inputs. This feature actively retains the last valid logic state when an input floats, ensuring stable logic levels during tri-state conditions or connector insertion/removal - a key advantage in modular industrial systems.

What package type and dimensions does the 74FCT162H952ATPACT use?

The 74FCT162H952ATPACT uses a 56-pin Thin Shrunk Small Outline Package (TSSOP), designated DGG by Texas Instruments, with 0.5 mm pin pitch, 13.9 mm × 7.9 mm body size, and maximum 1.2 mm height. It complies with JEDEC MO-153 and is optimized for high-density PCB layouts in industrial and communications equipment.

How does the Ioff feature of the 74FCT162H952ATPACT protect the system during partial power-down?

The Ioff feature of the 74FCT162H952ATPACT disables all outputs and blocks reverse current flow when VCC = 0 V, limiting IOFF to ±1 µA. This prevents damaging backfeed current from powered sections of the system into unpowered sections - critical for hot-swap capable backplanes, modular PLC I/O carriers, and mixed-voltage embedded systems where subsystems power up/down independently.

What is the maximum propagation delay specification for the 74FCT162H952ATPACT, and under what conditions is it measured?

The 74FCT162H952ATPACT has a maximum propagation delay of 10.0 ns from CLKAB or CLKBA to A or B outputs, specified over the full industrial temperature range (–40°C to +85°C) and VCC = 4.5 V to 5.5 V. This value applies to both rising and falling edges and ensures reliable timing in synchronous 100 MHz bus architectures with adequate setup/hold margin.