74LVCH322245AEC;55

Overview

The 74LVCH322245AEC is a 32-bit bus transceiver with non-inverting 3-state outputs in both send and receive directions. It features four output enable (nOE) inputs for cascading and four direction control (nDIR) inputs. The device includes integrated 30 Ω series termination resistors to reduce line noise. Inputs accept voltages up to 5.5 V, allowing interfacing with 5 V logic while operating on supply voltages from 1.2 V to 3.6 V. Bus hold on data inputs eliminates the need for external pull-up resistors.

Feature Summary

• Features four independent output enable and direction control inputs for easy cascading and precise bus management.
• Includes integrated 30 Ω series termination resistors in both high and low output stages to minimize signal reflections and line noise.
• Provides 5 V tolerant inputs and outputs, enabling direct interface with mixed 3.3 V and 5 V logic systems.
• Incorporates bus hold circuitry on all data inputs to maintain stable states without requiring external pull-up components.

Applications

• Mixed voltage system interconnects between 3.3 V and 5 V logic domains
• High-speed data bus transceivers requiring controlled impedance termination
• Cascaded multi-byte data flow architectures

Procurement Notes

Verify the specific ordering suffix '55' against NXP documentation, as the provided datasheet lists the base part number 74LVCH322245AEC without this suffix. Confirm that the package variant matches the SOT536-1 LFBGA96 specification. Ensure compatibility with the specified temperature range of -40 °C to +85 °C for your application environment before finalizing procurement.

Selection Notes

Select this component when designing systems requiring 32-bit bidirectional data transfer with integrated termination. It is suitable for applications needing 5 V tolerance on inputs while operating at lower supply voltages. The multiple enable and direction pins facilitate complex bus topologies. Ensure design accounts for the required pull-up resistor on nOE during power-up sequences to guarantee high-impedance states.

Part Context

This device belongs to the NXP LVCH family of low-voltage CMOS bus transceivers. It is designed for high-density digital interfaces where signal integrity is critical due to the built-in termination resistors. The LFBGA96 package allows for compact PCB layouts in space-constrained electronic designs requiring robust 32-bit data paths.

Replacement Considerations

Consult NXP official documentation for verified substitute part numbers. Cross-reference pinouts and electrical characteristics carefully if considering alternatives from other manufacturers.

FAQ

How does the device handle unused data inputs?

All data inputs feature bus hold circuitry, which maintains the input state without requiring external pull-up or pull-down resistors.

What is the purpose of the integrated 30 Ω resistors?

The integrated 30 Ω series termination resistors are located in both the HIGH and LOW output stages to reduce line noise and improve signal integrity.

Can this device interface directly with 5 V logic?

Yes, the inputs are 5 V tolerant and can accept voltages up to 5.5 V, allowing direct interfacing with 5 V logic devices even when powered by lower voltages.