Texas Instruments 74FCT162H244ATPACT

Overview

74FCT162H244ATPACT from Texas Instruments is a 16-bit non-inverting three-state buffer/line driver with bus-hold inputs, designed for memory and bus interface applications requiring high-speed (4.8 ns max propagation delay), low-noise operation, and Ioff partial-power-down protection. It delivers ±24 mA balanced output drive at 5V, supports industrial temperature range (–40°C to +85°C), and eliminates external pull-up/down resistors via integrated bus-hold circuitry.

For engineers reviewing the 74FCT162H244ATPACT datasheet, 74FCT162H244ATPACT pinout, 74FCT162H244ATPACT application, or 74FCT162H244ATPACT equivalent, this device is selected for high-density backplane driving, TTL-compatible bus buffering with floating-input immunity, and systems requiring guaranteed output disable timing (≤6.2 ns) and low ground bounce (<0.6 V).

Technical Context

This device implements dual 8-bit or quad 4-bit configurable three-state control (1OE, 2OE, 3OE, 4OE), enabling flexible bus segmentation. Its bus-hold inputs retain last valid logic state during high-impedance conditions, preventing metastability without external biasing.

The 74FCT162H244ATPACT uses FCT logic family architecture with edge-rate control circuitry to suppress switching noise, achieves typical output skew <250 ps, and features Ioff protection that disables outputs and blocks current backflow when VCC = 0 V - critical for hot-swap and partial-power-down systems.

Key Specifications

Pinout & Package

74FCT162H244ATPACT is housed in a 48-lead TSSOP (DGG) package, 12.6 mm × 6.2 mm × 1.2 mm max height, 0.5 mm pitch, JEDEC MO-153 compliant. Pin 1 marked with dot; pins arranged in flow-through configuration to minimize PCB trace crossovers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus buffer applications.

Compared with CY74FCT162244ATPACT and 74FCT16244ATPACT, the 74FCT162H244ATPACT uniquely combines bus-hold functionality with moderate drive strength and lowest ground bounce - making it optimal for floating-input-sensitive, noise-critical industrial bus interfaces where BOM simplification is mandatory.

Availability

74FCT162H244ATPACT is available at Aetrix Electronics and suitable for industrial control systems, automated test equipment, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74FCT162H244ATPACT 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 IC design.

The 74FCT162H244ATPACT belongs to TI's FCT logic family, engineered specifically for noise-sensitive, high-speed digital interfacing in industrial and communications equipment where bus stability, power sequencing robustness, and layout efficiency are critical.

FAQ

What is the function of bus-hold circuitry in the 74FCT162H244ATPACT?

The bus-hold circuitry in the 74FCT162H244ATPACT actively retains the last valid logic state on each of its 16 data inputs when those inputs become high-impedance - for example, during bus release or signal disconnection. This eliminates the need for external pull-up or pull-down resistors, reducing component count and PCB area. The 74FCT162H244ATPACT sustains this hold with ±50 µA current at VI = 0.8 V or 2.0 V, ensuring stable logic levels across the full industrial temperature range.

Does the 74FCT162H244ATPACT support partial-power-down operation?

Yes, the 74FCT162H244ATPACT fully supports partial-power-down operation via its Ioff circuitry. When VCC = 0 V, the outputs are disabled and leakage current is limited to ±1 µA, preventing damaging current backflow from powered sections of the system into the unpowered 74FCT162H244ATPACT. This feature is explicitly tested and guaranteed per TI's datasheet, making the 74FCT162H244ATPACT suitable for hot-swap and multi-rail power architectures.

What is the maximum propagation delay for the 74FCT162H244ATPACT?

The maximum propagation delay (tPLH/tPHL) for the 74FCT162H244ATPACT is 4.8 ns over the full industrial temperature range (–40°C to +85°C) and VCC = 4.5 V to 5.5 V. This value is specified in the official Texas Instruments datasheet under "Switching Characteristics Over the Operating Range" and applies to all 16 channels. The 74FCT162H244ATPACT achieves this performance while maintaining ±24 mA drive capability and bus-hold functionality - a key differentiator versus faster but non-bus-hold variants.

Which package type does the 74FCT162H244ATPACT use?

The 74FCT162H244ATPACT uses a 48-lead TSSOP (Thin Shrunk Small Outline Package), designated by TI as package code DGG, with 0.5 mm lead pitch, 12.6 mm × 6.2 mm body size, and 1.2 mm maximum height. This package is JEDEC MO-153 compliant and optimized for high-density surface-mount assembly. The "PACT" suffix in the part number explicitly denotes the TSSOP variant - distinct from the SSOP (PVCT) version used in other members of the same family.

How does the 74FCT162H244ATPACT reduce ground bounce compared to standard FCT buffers?

The 74FCT162H244ATPACT reduces ground bounce through two integrated mechanisms: edge-rate controlled outputs and balanced ±24 mA drive strength. Its output transition times are intentionally shaped to limit di/dt, resulting in typical ground bounce <0.6 V at VCC = 5 V and TA = 25°C - significantly lower than the 1.0 V observed in the higher-drive 74FCT16244ATPACT. This behavior is confirmed in TI's datasheet under "CY74FCT162244T/CY74FCT162H244T Output Drive Characteristics" and directly benefits noise-sensitive backplane and mixed-signal applications.