74ACT1284TTR

Overview

The STMicroelectronics 74ACT1284TTR is a high-speed IEEE 1284 transceiver IC designed for bidirectional parallel peripheral communication. It integrates four non-inverting bidirectional buffers and three non-inverting buffers with open-drain outputs, fabricated in silicon gate C2MOS technology. The device supports Extended Capabilities Port (ECP) modes for connecting personal computers to printing peripherals. It operates within a supply voltage range of 4.5V to 5.5V, featuring TTL-compatible inputs and ESD protection exceeding 2000V per MIL-STD-883B Method 3015.7.

Feature Summary

• Supports IEEE Std 1284-I and II standards for bidirectional parallel communications
• Features an HD input pin enabling switching between open-drain and high-drive totem-pole output modes
• Includes DIR control input to determine data flow direction between A and B ports

Applications

• Extended Capabilities Port (ECP) mode signaling
• Bidirectional parallel interfaces for printers
• Peripheral connections between personal computers and printing devices

Procurement Notes

Verify the specific package type against the ordering code suffix, as the TTR suffix indicates Tape & Reel packaging while other suffixes may denote tube packaging. Confirm that the required operating temperature range aligns with the commercial specifications provided in the datasheet. Ensure compatibility with the intended logic family voltages before integration into the design.

Selection Notes

Select this component when designing systems requiring compliance with IEEE 1284 standards for bidirectional data transfer. It is suitable for applications needing asymmetric drive capabilities, where one port provides standard totem-pole outputs and the other offers selectable high-drive or open-drain functionality. Consider the propagation delay characteristics relative to system clock speeds.

Part Context

This part belongs to the 74ACT series of logic integrated circuits manufactured by STMicroelectronics. The 74ACT series utilizes advanced CMOS technology to provide performance levels comparable to the older 74ACT family while maintaining low power consumption. This specific transceiver addresses the specialized requirements of parallel port interface protocols.

Replacement Considerations

Direct replacements include the SN74ACT1284DBR from Texas Instruments. Verify pinout compatibility and electrical characteristics such as drive current and propagation delays before substituting.