74VHC161284MEA

Specialty Logic Overview

The onsemi 74VHC161284MEA is an IEEE 1284 compliant transceiver designed for Extended Capabilities Port (ECP) mode. It integrates eight bidirectional data buffers and eleven control/status buffers within a single 48-lead SSOP package. The device supports Level 1 and Level 2 signaling standards, enabling full-duplex parallel communication between host computers and peripherals. Cable-side outputs feature configurable high drive or open drain modes with optimized series termination resistance to drive external cables effectively.

Specialty Logic Feature Summary

• Supports IEEE 1284 Level 1 and Level 2 signaling standards for bidirectional parallel communications
• Cable-side outputs offer selectable high drive or open drain configurations with optimized pull-up/pull-down resistances
• All cable-side inputs and outputs include internal pull-up resistors connected to VCC for proper termination
• B and Y outputs enter high impedance mode during power down to prevent bus contention

Specialty Logic Applications

• Extended Capabilities Port (ECP) interface implementation
• Bidirectional parallel communication links between personal computers and printing peripherals
• Host-to-peripheral data transfer systems requiring IEEE 1284 compliance

Specialty Logic Procurement Notes

Verify the specific ordering code suffix against current ON Semiconductor documentation, as Fairchild part numbers containing underscores may have been converted to dashes. Confirm that the MS48A package variant matches the required mechanical footprint. Ensure the application environment remains within the specified operating temperature range of -40°C to +85°C and supply voltage limits of 4.5V to 5.5V.

Specialty Logic Selection Notes

Select this component when a single-chip solution is required to replace two separate 74ACT1284 devices. It is suitable for designs needing flow-through pin configurations to simplify peripheral-to-host interfacing. Consider the internal pull-ups and optimized output impedance if driving external cables directly without additional discrete components.

Specialty Logic Part Context

This device belongs to the 74VHC logic family, characterized by high-speed CMOS technology compatible with standard 5V logic levels. Originally manufactured by Fairchild Semiconductor, it is now distributed under the ON Semiconductor brand following corporate integration. The 74VHC161284 serves as a specialized interface bridge rather than a general-purpose logic gate.

Specialty Logic Replacement Considerations

The datasheet explicitly states that this device replaces the function of two 74ACT1284 devices. Verify pin compatibility and electrical characteristics before substituting other IEEE 1284 transceivers.