74LVCZ161284ATTR

Overview

The STMicroelectronics 74LVCZ161284ATTR is a low voltage high speed IEEE 1284 transceiver designed for bidirectional parallel communications between personal computers and printing peripherals. It contains eight non-inverting bidirectional buffers and eleven control/status buffers with open drain outputs, fabricated in silicon gate C2MOS technology. The device operates within a supply voltage range of 3.0V to 3.6V and supports commercial temperature ranges from -40°C to +85°C.

Feature Summary

• Features an auto power-up mechanism that prevents printer system errors by keeping specific outputs in a high state until associated inputs are activated.
• Integrates pull-up resistors on all open-drain outputs, eliminating the need for discrete external resistor components.
• Provides translation capability allowing outputs to interface safely with 5V signals while operating at lower voltages.
• Supports both IEEE STD 1284-I Level 1 Type and IEEE STD 1284-II Level 2 Type standards for extended capabilities port modes.

Applications

• Bidirectional parallel peripheral communication in Extended Capabilities Port (ECP) modes
• Interfacing personal computers with printing peripherals
• High-speed data transfer applications requiring error-free power-up sequences

Procurement Notes

Verify the exact ordering code matches the required package type and tape/reel configuration. Confirm that the specified operating temperature range aligns with your environmental requirements. Ensure compatibility with existing IEEE 1284 signaling standards before finalizing procurement decisions.

Selection Notes

Select this component when designing systems requiring robust bidirectional data flow between host logic and peripheral devices. Consider its integrated pull-up features and high drive capabilities if minimizing external component count is a priority. Evaluate its propagation delay specifications against your maximum data throughput requirements.

Part Context

This device belongs to the 74LVC family of logic ICs, specifically engineered for low voltage and high-speed operations. It serves as a specialized interface solution replacing multiple standard buffer devices, consolidating functionality into a single integrated circuit for efficient board space utilization.

Replacement Considerations

Direct replacements include the SN74LVC161284DGGR from Texas Instruments. Verify pinout compatibility and electrical characteristics before substituting other manufacturers' equivalents.

FAQ

How does the device prevent printer errors during power-on?

The device includes an active input detection circuit that forces specific outputs to stay in a high state after power-on until an associated input goes high, preventing deassertion of the BUSY signal.

What is the function of the HD input pin?

The HD (High Drive Enable) input allows the Cable port to switch from Open Drain mode to a high drive totem pole output, capable of sourcing significant current on designated buffers.