onsemi 74LCXZ162244MEA

Overview

74LCXZ162244 from Fairchild Semiconductor is a low-voltage 16-bit non-inverting buffer/line driver with nibble-level 3-STATE control, 5V-tolerant I/O, integrated 26 Ω output series resistors, and guaranteed high-impedance during power-up/down. It operates at 2.7–3.6 V, delivers ±12 mA drive at 3.0 V, and achieves 5.3 ns max propagation delay-designed for memory/address bus driving in mixed-voltage systems.

For engineers reviewing the 74LCXZ162244 datasheet, pinout, applications, or equivalent options, key selection considerations include 5V-tolerant I/O compatibility with legacy logic, on-die series termination for EMI reduction, nibble-selectable 3-STATE control, and guaranteed power-cycle high-impedance behavior to prevent bus contention.

Technical Context

The 74LCXZ162244 implements four independent 4-bit nibbles, each with dedicated active-low Output Enable (OEn) inputs enabling selective 3-STATE control without external logic. Its CMOS design ensures rail-to-rail input voltage tolerance (0–5.5 V) while operating from a 2.7–3.6 V supply.

Each output integrates a nominal 26 Ω series resistor to suppress overshoot/undershoot in high-speed bus environments; it supports live insertion/withdrawal and meets >500 mA latch-up immunity per JEDEC JESD78. The device enters high-impedance state automatically when VCC drops below 1.5 V or rises from 0 V.

Key Specifications

Pinout & Package

74LCXZ162244 is packaged in a 48-lead Small Shrink Outline Package (SSOP), JEDEC MO-118 compliant, 0.300" wide, with 0.025" pitch. Pin count and physical layout match industry-standard 48-pin SSOP footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LCXZ162244, the 74LVC162244ADGG offers faster timing but demands external termination, while SN74ALVC162244DGGR provides stronger drive yet lacks power-cycle high-impedance assurance-making 74LCXZ162244 uniquely suited for mixed-voltage bus isolation with intrinsic EMI control and hot-swap safety.

Availability

74LCXZ162244 is available at Aetrix Electronics and suitable for memory address buffering, PCI/ISA bus interfacing, hot-swappable backplane modules, and industrial I/O expansion requiring stable component supply and long-term obsolescence management.

Supply support for 74LCXZ162244 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 U.S.-based semiconductor company specializing in analog and mixed-signal ICs, power management, and logic devices before its acquisition by ON Semiconductor in 2016.

The 74LCXZ162244 belongs to the LCX family of low-voltage, 5V-tolerant logic devices engineered for seamless integration between 3.3 V systems and legacy 5 V infrastructure in computing, industrial, and communications equipment.

FAQ

What is the maximum input voltage the 74LCXZ162244 can tolerate?

The 74LCXZ162244 supports DC input voltages from 0 V to 5.5 V regardless of VCC level, enabling direct connection to 5 V logic families without level-shifting circuitry. This 5V-tolerant feature is guaranteed across the full operating temperature range (–40°C to +85°C) and applies to all 16 inputs (I0–I15) and the four OE pins. The specification is validated per Fairchild's DC Electrical Characteristics table under Recommended Operating Conditions.

Does the 74LCXZ162244 require external series resistors on its outputs?

No, the 74LCXZ162244 does not require external series resistors because each output integrates a nominal 26 Ω series resistor to suppress overshoot and undershoot. This on-die termination is specified in the General Description and confirmed in the Features list. It eliminates four discrete 26 Ω resistors per nibble in typical 16-bit bus layouts, reducing component count and improving signal integrity on FR-4 PCBs with trace lengths up to 10 cm.

How does the 74LCXZ162244 behave during power-up and power-down sequences?

The 74LCXZ162244 guarantees high-impedance (Z) output states whenever VCC is between 0 V and 1.5 V-covering both power-up ramp and power-down collapse. This behavior prevents bus contention and back-driving in mixed-power-domain systems. It is implemented via internal power-on reset circuitry and is explicitly documented in the General Description and Absolute Maximum Ratings section of the datasheet.

What is the output drive capability of the 74LCXZ162244 at 3.0 V supply?

At VCC = 3.0 V, the 74LCXZ162244 delivers ±12 mA output current per pin in HIGH or LOW state, as specified in the DC Electrical Characteristics table under IOH/IOL. This drive strength supports fan-out to multiple CMOS loads or terminated transmission lines while maintaining VOL ≤ 0.8 V and VOH ≥ 2.0 V under full load, ensuring reliable logic-level margins in noisy industrial environments.

Is the 74LCXZ162244 pin-compatible with other 16-bit buffers in the LCX family?

Yes, the 74LCXZ162244 shares identical pinout and package dimensions with other 48-pin SSOP 16-bit LCX buffers such as 74LCX162244 and 74LCX16373, including matching VCC, GND, I/O, and OE pin locations. However, functional differences exist: only the 74LCXZ162244 includes integrated 26 Ω output resistors and guaranteed power-cycle high-impedance. Pin compatibility enables drop-in replacement in existing layouts where those features are not required.