onsemi 74LCXZ162244MTD

Overview

74LCXZ162244 from Fairchild Semiconductor is a low-voltage 16-bit non-inverting buffer/line driver with 5V-tolerant I/O, 26 Ω integrated output series resistors, 3.3V nominal supply operation, and nibble-level 3-STATE control. It serves as a memory/address bus driver or clock distribution buffer in mixed-voltage systems interfacing 3.3V logic to 5V buses.

For engineers reviewing the 74LCXZ162244 datasheet, pinout, applications, or equivalent options, key selection criteria include 5V I/O tolerance, guaranteed power-up/down high-impedance behavior, 5.3 ns max propagation delay at 3.0V, 12 mA drive capability, and TSSOP-48 packaging for space-constrained board layouts.

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 affecting other sections. Its advanced CMOS process delivers high-speed operation while maintaining low static current (225 µA max ICC).

Each output integrates a nominal 26 Ω series resistor to suppress overshoot/undershoot in transmission-line environments; outputs are fully 5V-tolerant across 0–5.5V input/output voltage range regardless of VCC (2.7–3.6V), supporting live insertion and hot-swap applications.

Key Specifications

Pinout & Package

74LCXZ162244 is housed in a 48-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 6.1 mm wide, with 0.5 mm lead pitch and exposed pad not present.

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 requires external termination for clean edges, while SN74ALVC162244DGGR provides greater drive strength at the cost of added layout complexity for signal integrity - the 74LCXZ162244 uniquely integrates both 5V tolerance and 26 Ω series resistance in one device.

Availability

74LCXZ162244 is available at Aetrix Electronics and suitable for memory subsystems, industrial backplane interfaces, hot-swappable module designs, and mixed-voltage embedded control applications requiring stable component supply and long-term lifecycle support.

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, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.

The 74LCXZ162244 belongs to the LCXZ family of low-voltage, 5V-tolerant logic devices designed specifically for seamless interoperation between 3.3V systems and legacy 5V buses in memory, address, and clock distribution roles.

FAQ

What is the maximum operating frequency supported by the 74LCXZ162244?

The 74LCXZ162244 does not specify a maximum clock frequency directly, but its 5.3 ns maximum propagation delay at VCC = 3.0V implies reliable operation up to approximately 100 MHz in well-terminated bus environments. Actual usable frequency depends on load capacitance, trace length, and termination - the integrated 26 Ω series resistors help maintain signal integrity at these speeds without external components. For the 74LCXZ162244, timing margins should be verified per application using the AC Electrical Characteristics table in the datasheet.

Does the 74LCXZ162244 require external pull-up or pull-down resistors on unused inputs?

Yes - per the datasheet's Recommended Operating Conditions (Note 4), all unused inputs on the 74LCXZ162244 must be held HIGH or LOW and must not be left floating. This prevents increased ICC, potential oscillation, or undefined logic states. The 74LCXZ162244 has no internal weak pull-ups or pull-downs; external biasing is mandatory for unused I0–I15 and OE1–OE4 pins to ensure predictable operation and meet specified leakage limits.

Can the 74LCXZ162244 be used with a 2.5V supply voltage?

No - the 74LCXZ162244 is not characterized or guaranteed for operation at 2.5V. Its Recommended Operating Conditions specify a minimum VCC of 2.7V and maximum of 3.6V. At 2.5V, parameters such as VIH/VIL thresholds, output drive strength, and propagation delay fall outside specification and may result in unreliable logic behavior. For 2.5V systems, consider alternatives like the 74LVC162244, which supports 1.65–3.6V operation. The 74LCXZ162244 must be operated strictly within its 2.7–3.6V range.

How does the 74LCXZ162244 handle power sequencing when VCC ramps slowly?

The 74LCXZ162244 guarantees high-impedance outputs whenever VCC is between 0V and 1.5V, making it robust during slow or asymmetric power ramp-up/down. This feature prevents bus contention in multi-rail systems and enables safe hot-insertion. Unlike standard buffers, the 74LCXZ162244 does not require external power-on reset circuitry to manage output states - the internal design enforces Z-state before valid logic levels are established. This behavior is intrinsic to the 74LCXZ162244 and applies across temperature and process corners.

Are the 26 Ω series resistors in the 74LCXZ162244 matched across all 16 outputs?

Yes - the 26 Ω value is a nominal, process-controlled characteristic applied uniformly across all O0–O15 outputs of the 74LCXZ162244. While absolute tolerance is not specified in the datasheet, the resistors are fabricated monolithically and exhibit tight matching essential for skew-sensitive applications like parallel bus driving. This matching contributes to the device's guaranteed 1.0 ns max output-to-output skew (tOSHL/tOSLH), ensuring simultaneous edge transitions critical for timing-critical memory and address paths.