74LCXH162244MEX

Overview

The onsemi 74LCXH162244MEX is a low voltage 16-bit buffer and line driver featuring active bushold inputs and integrated series output resistors. It operates within a supply voltage range of 2.3V to 3.6V, with outputs capable of interfacing in 5V environments. The device provides 3-STATE outputs controlled by four independent nibble enable signals. It delivers up to 12mA drive current at VCC = 3.0V and exhibits a maximum propagation delay of 5.3ns at VCC = 3.0V. Packaged in a 48-lead Thin Shrink Small Outline Package (TSSOP), it supports high-speed memory and address driving applications.

Feature Summary

• Integrates active bushold circuitry on data inputs to eliminate the need for external pull-up or pull-down resistors.
• Includes equivalent 26/Ω to 58/Ω series resistors in outputs to reduce overshoot and undershoot without external termination components.
• Features 5V tolerant control inputs and outputs for direct interfacing with 5V signal environments.
• Supports nibble-controlled operation via four independent Output Enable inputs for flexible bus-oriented transmission.

Applications

• Memory address drivers
• Clock drivers
• Bus oriented transmitter/receiver

Procurement Notes

Verify that the specific ordering suffix 'MEX' corresponds to the 48-lead TSSOP package configuration as documented in the datasheet. Confirm compatibility with the recommended operating conditions, specifically the 2.3V to 3.6V supply voltage range. Ensure design adherence to the absolute maximum ratings regarding input and output voltages to prevent device damage during procurement and integration.

Selection Notes

Select this component when designing systems requiring 16-bit buffering with integrated noise reduction features. The built-in series resistors simplify PCB layout by removing the need for discrete termination resistors. Choose this part for applications needing 5V tolerance on both inputs and outputs while operating from lower voltage supplies like 3.3V or 2.5V. Verify that the nibble control architecture fits the system's bus management requirements.

Part Context

This device belongs to the LCXH family of low voltage CMOS logic devices. It is manufactured using advanced CMOS technology to achieve high-speed operation with low power dissipation. The product line includes variants with different packaging options, such as SSOP and TSSOP, catering to various surface mount assembly needs in consumer and industrial electronics.

Replacement Considerations

The datasheet lists 74LCXH162244MEA and 74LCXH162244MTD as alternative ordering codes offering identical functionality in SSOP and TSSOP packages respectively. These parts share the same electrical specifications and pinout configurations, allowing for substitution based on available inventory or board space constraints.

FAQ

How does the bushhold feature function on the data inputs?

The active bushold circuitry automatically holds unused or floating data inputs at a valid logic level, eliminating the requirement for external pull-up or pull-down resistors.

What is the purpose of the series resistors in the outputs?

The outputs include equivalent series resistance ranging from 26 to 58 ohms to reduce signal overshoot and undershoot, making external termination resistors unnecessary.

Can the device interface with 5V signals?

Yes, the 74LCXH162244MEX features 5V tolerant control inputs and outputs, allowing it to interface directly with 5V signal environments despite operating at lower supply voltages.