74LCXH2245SJX

Overview

The onsemi 74LCXH2245SJX is a low-voltage bidirectional transceiver featuring eight non-inverting buffers with three-state outputs. It operates within a supply voltage range of 2.0V to 3.6V and utilizes advanced CMOS technology for high-speed operation with low power dissipation. The device incorporates active bushold circuitry on data inputs, eliminating the need for external pull-up or pull-down resistors. Additionally, it includes an equivalent 26Ω/58Ω series resistor in the B port outputs to reduce overshoot and undershoot.

Feature Summary

• Active bushold circuitry on data inputs eliminates the need for external pull-up or pull-down resistors.
• Integrated series resistance in B port outputs reduces output overshoot and undershoot.
• Five-volt tolerant control inputs allow compatibility with mixed-voltage systems.
• Power-down mode places outputs in a high-impedance state.

Applications

• Bus-oriented applications
• Low voltage (2.5V and 3.3V) VCC system interfacing

Procurement Notes

Verify that the ordering code suffix 'X' corresponds to tape and reel packaging as specified in the datasheet. Confirm the package type matches the M20D designation for the 20-Lead Small Outline Package. Ensure compliance with JEDEC J-STD-020B standards for lead-free packages when sourcing this component.

Selection Notes

Select this component for designs requiring bidirectional data transfer between buses operating at low voltages. The inclusion of bushold functionality simplifies input handling for unused lines. Consider the specific drive current requirements of the B port outputs, which differ from the A port depending on the supply voltage level.

Part Context

This part belongs to the LCXH family of low-voltage CMOS logic devices. It is functionally similar to other bidirectional transceivers but distinguished by its integrated bushold inputs and specific series resistance characteristics on one port. The device was originally manufactured by Fairchild Semiconductor and is now distributed under the onsemi brand.

Replacement Considerations

Public confirmed substitute part numbers include MC74LCX245DWG and MC74LCX245DWR2G from onsemi.

FAQ

What is the purpose of the bushhold feature?

The bushold feature maintains unused or floating data inputs at a valid logic level without requiring external pull-up or pull-down resistors.

How does the series resistor affect the B port outputs?

The equivalent 26Ω/58Ω series resistor in the B port outputs helps reduce output overshoot and undershoot during signal transitions.