74LVX161284MEAX

Overview

The 74LVX161284MEAX is a low voltage IEEE 161284 translating transceiver containing eight bidirectional data buffers and eleven control/status buffers. It supports IEEE 1284 Level 1 and Level 2 signaling standards for bidirectional parallel communications between personal computers and printing peripherals in Extended Capabilities Port mode. The device allows outputs on the cable side to interface with 5V signals while inputs operate at 3V logic. It features flow-through pin configuration for easy peripheral-to-host interfacing.

Feature Summary

• Supports IEEE 1284 Level 1 and Level 2 signaling standards for bidirectional parallel communications
• Translation capability enables cable-side outputs to interface with 5V signals
• All inputs include hysteresis to provide noise margin
• B and Y output resistance optimized to drive external cables

Applications

• Extended Capabilities Port (ECP) implementations
• Bidirectional parallel communication interfaces between personal computers and printing peripherals
• IEEE 1284 compliant interface designs

Procurement Notes

Verify the package type, as the MEAX suffix indicates SSOP-48. Confirm that VCC-Cable requirements align with system design, as it must be greater than or equal to VCC. Ensure input voltage limits are respected for all pins, particularly B1-B8 and C14-C17 which support higher voltages. Check for updated ordering codes if migrating from legacy Fairchild nomenclature.

Selection Notes

Select this component when designing an IEEE 1284 compliant interface requiring translation between 3V peripheral logic and 5V host/cable signals. It replaces two 74ACT1284 devices, reducing board space. Consider the separate VCC-Cable supply requirement for cable-side outputs. Verify that the flow-through pinout matches the existing PCB layout constraints for peripheral-to-host connections.

Part Context

This device belongs to the LVX series of low-voltage CMOS logic products manufactured by onsemi. It implements the IEEE 161284 standard for high-speed bidirectional data transfer. The part integrates both data and control buffers into a single 48-lead package, simplifying the design of parallel port interfaces compared to using multiple discrete logic components.

Replacement Considerations

The datasheet states the device replaces the function of two 74ACT1284 devices.