onsemi 74VCXH162244MTD

Overview

74VCXH162244 from Fairchild Semiconductor is a low-voltage 16-bit non-inverting buffer/line driver with bushold inputs and integrated 26 Ω series output resistors, operating from 1.4 V to 3.6 V V_CC, delivering ≤3.3 ns propagation delay at 3.3 V, ±12 mA drive strength, and 3.6 V-tolerant I/O - used in memory address drivers, clock distribution networks, and bus transceivers.

For engineers reviewing the 74VCXH162244 datasheet, pinout, applications, or equivalent options, key selection criteria include nibble-level 3-STATE control, bushold input retention without external pull-ups, output-series termination for EMI reduction, and TSSOP-48 packaging compatible with high-density PCB layouts.

Technical Context

The 74VCXH162244 implements four independent 4-bit nibble groups, each with dedicated active-low Output Enable (OEn) inputs enabling selective 3-STATE control per group. Its bushold circuitry actively maintains valid logic states on floating I0–I15 inputs without external biasing.

Each output incorporates a built-in 26 Ω series resistor to dampen ringing and reduce simultaneous switching noise, while the device supports mixed-voltage interfacing via 3.6 V-tolerant control and data pins across its full 1.4 V–3.6 V supply range.

Key Specifications

Pinout & Package

Package: 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1 mm wide (MTD48).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC162244ADGG and SN74AVC162244DGGR, the 74VCXH162244 uniquely combines bushold, integrated 26 Ω output resistors, and 3.6 V tolerance in a 48-pin TSSOP - reducing component count and improving noise immunity without sacrificing timing performance.

Availability

74VCXH162244 is available at Aetrix Electronics and suitable for memory subsystem design, clock tree implementation, and industrial bus interface applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature and voltage ranges.

Supply support for 74VCXH162244 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

Fairchild Semiconductor was a leading designer of high-performance analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.

The VCXH logic family targets low-voltage, noise-sensitive digital interfaces - specifically engineered for 1.4 V–3.6 V operation with bushold and integrated termination to simplify robust, high-density PCB designs.

FAQ

What is the function of bushold in the 74VCXH162244?

The bushold circuitry in the 74VCXH162244 actively maintains the last-valid logic state on each data input (I0–I15) when left floating, eliminating the need for external pull-up or pull-down resistors. This feature reduces BOM cost and PCB area while preventing undefined states during power-up, reset, or tri-state transitions - a key reliability advantage in the 74VCXH162244 over standard LVC buffers.

Does the 74VCXH162244 support mixed-voltage interfacing?

Yes, the 74VCXH162244 supports mixed-voltage interfacing: its control and data inputs are 3.6 V tolerant, allowing connection to 3.3 V or 5 V signal sources even when V_CC is as low as 1.4 V. This capability enables seamless integration into heterogeneous voltage-domain systems without external level shifters - a defining characteristic of the 74VCXH162244.

What is the purpose of the 26 Ω series resistors in the 74VCXH162244 outputs?

The 26 Ω series resistors integrated into each output (O0–O15) of the 74VCXH162244 dampen signal edge ringing and reduce simultaneous switching noise (SSN) on transmission lines. This built-in termination improves signal integrity in memory address, clock, and bus applications - directly lowering EMI emissions and easing layout constraints compared to discrete resistor solutions used with other buffers like the 74LVC162244ADGG.

How many independent 3-STATE control inputs does the 74VCXH162244 have?

The 74VCXH162244 has four independent active-low Output Enable inputs (OE1–OE4), each controlling a 4-bit nibble (I0–I3/O0–O3, etc.). This nibble-level granularity allows selective bus isolation, partial power gating, and protocol-aware data routing - a functional distinction from fully enabled-only alternatives such as the SN74AVC162244DGGR, which lacks per-nibble control in its base configuration.

What is the maximum propagation delay of the 74VCXH162244 at 3.3 V?

The maximum propagation delay (t_PHL/t_PLH) of the 74VCXH162244 is 3.3 ns at V_CC = 3.3 V ± 0.3 V, CL = 30 pF, and TA = –40 °C to +85 °C. This specification is guaranteed across process, voltage, and temperature corners - confirming the 74VCXH162244's suitability for sub-300 MHz address/data paths in memory and peripheral interfaces.