onsemi 74VCX162244MTD

Overview

74VCX162244 from ON Semiconductor is a low-voltage 16-bit non-inverting buffer/line driver with nibble-level 3-STATE control, 3.6V-tolerant I/O, integrated 26Ω series output resistors, and operation from 1.2V to 3.6V V_CC. It serves as a memory/address driver or bus transmitter in mixed-voltage systems such as DDR memory interfaces and low-power industrial controllers.

For engineers reviewing the 74VCX162244 datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.6V I/O tolerance across 1.2V–3.6V supply, 3.3 ns max propagation delay at 3.3V, 12 mA drive strength, power-off high-impedance behavior, and TSSOP-48 package compatibility with JEDEC MO-153 footprint.

Technical Context

The 74VCX162244 implements four independent 4-bit (nibble) groups, each with dedicated active-low Output Enable (OE1–OE4) inputs-enabling selective 4-bit bus isolation without full 16-bit gating. Its CMOS design ensures rail-to-rail output swing and supports live insertion due to power-off high-Z I/O states.

Each output integrates a 26Ω series resistor to suppress transmission-line ringing and reduce EMI in high-speed address/data routing. The device meets JEDEC JESD78 latch-up immunity (>300 mA) and exceeds 2000V HBM ESD rating, making it suitable for board-level interconnects subject to handling and hot-swap stress.

Key Specifications

Pinout & Package

74VCX162244 is packaged in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch. Pin assignments are defined for top-thru view.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16244ADGGR and 74ALVC162244PW, the 74VCX162244 uniquely combines 1.2V operation, 3.6V I/O tolerance, integrated 26Ω resistors, and power-off high-Z - making it the only option for robust, low-component-count interfacing in heterogeneous voltage systems.

Availability

74VCX162244 is available at Aetrix Electronics and suitable for memory subsystems, industrial I/O expansion, clock fanout networks, and low-power embedded bus interfaces requiring stable component supply despite its discontinued-for-new-design status.

Supply support for 74VCX162244 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

ON Semiconductor (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor solutions, specializing in power management, analog, logic, and custom devices for automotive, industrial, and computing markets.

The 74VCX162244 belongs to the VCX low-voltage logic family, designed specifically for mixed-supply system interfacing where voltage translation, noise suppression, and power-aware operation are essential - not merely drop-in replacements for older 5V logic.

FAQ

Is the 74VCX162244 still in production and available for new designs?

No - the 74VCX162244 is officially discontinued and not recommended for new designs per ON Semiconductor's documentation. However, Aetrix Electronics maintains legacy inventory and provides lifecycle coordination support for existing production programs that rely on the 74VCX162244. Customers should consult their ON Semiconductor representative for migration paths before initiating new projects.

What does "3.6V tolerant inputs and outputs" mean for the 74VCX162244 in practice?

It means the 74VCX162244 inputs and outputs can safely accept or drive voltages up to 3.6V-even when V_CC is as low as 1.2V. This allows direct connection to 3.3V buses without level shifters or clamping diodes. For example, a 74VCX162244 powered at 1.8V can reliably receive signals from a 3.3V microcontroller and drive a 3.3V memory chip - a key enabler for heterogeneous voltage domain bridging.

How do the integrated 26Ω series resistors in the 74VCX162244 improve signal integrity?

The 26Ω resistors are placed in series with each output pin and act as source terminators for controlled-impedance traces. They dampen signal reflections caused by impedance mismatches, reducing overshoot, undershoot, and ringing-especially on unterminated or stub-loaded lines. In practice, this lowers EMI emissions by up to 10 dB and increases timing margin by >1 ns in 50 MHz address/data buses, eliminating the need for 16 discrete SMT resistors.

Can the 74VCX162244 be used in hot-swap or live-insertion applications?

Yes - the 74VCX162244 supports live insertion due to its power-off high-impedance I/O behavior and robust ESD/latch-up ratings (2000V HBM, >300 mA). When V_CC is removed, all inputs and outputs float to high-Z, preventing back-driving or contention with powered circuitry. This makes the 74VCX162244 suitable for modular backplane interfaces, field-replaceable I/O cards, and plug-in sensor hubs where boards may be inserted or removed under power.

What is the functional difference between OE1–OE4 and using a single OE input on the 74VCX162244?

The 74VCX162244 features four independent active-low Output Enable inputs (OE1–OE4), each controlling a 4-bit nibble (O0–O3, O4–O7, O8–O11, O12–O15). This enables selective bus segmentation - for instance, disabling only memory address bits A8–A11 while keeping A0–A7 active during a page-mode read. A single OE would force all 16 outputs into 3-STATE simultaneously, removing this granularity. OE pins may be tied together only if full 16-bit control is required.