74LVC161284DLRG4

Overview

The SN74LVC161284DLRG4 is a specialized IEEE Std 1284 parallel peripheral interface transceiver designed for asynchronous two-way communication between data buses. It operates with dual supply voltages: VCC at 3 V to 3.6 V and VCC CABLE at 3 V to 5.5 V, providing 5-V tolerance on cable-side I/O pins. The device features eight bidirectional bits (A1-A8 to B1-B8), five drivers (Y9-Y13) for the cable side, four receivers (C14-C17), and dedicated HOST LOGIC and PERI LOGIC lines. Integrated 1.4-kΩ pullup resistors are present on all open-drain outputs except HOST LOGIC IN and PERI LOGIC OUT.

Feature Summary

• Supports IEEE Std 1284-I Level 1 Type and IEEE Std 1284-II Level 2 Type electrical specifications
• Provides configurable output drive modes via HD pin, selectable between open-drain and totem-pole configurations
• Includes integrated 1.4-kΩ pullup resistors on cable-side outputs to eliminate discrete components
• Features flow-through architecture optimized for PCB layout efficiency

Applications

• Parallel peripheral interface connections compliant with IEEE Std 1284 standards
• Asynchronous data bus translation between host logic and peripheral devices
• System designs requiring voltage level shifting between 3-V and 5-V domains

Procurement Notes

Verify that the ordering suffix 'G4' corresponds to lead-free and RoHS-compliant manufacturing specifications as defined by Texas Instruments. Confirm package type DL (SSOP-48) matches the required footprint. Ensure design accounts for the specified operating temperature range of 0°C to 70°C and verify power supply requirements for both VCC and VCC CABLE rails before procurement.

Selection Notes

Select this component when designing interfaces requiring specific compliance with IEEE Std 1284 electrical characteristics. The dual-supply capability allows flexible integration in mixed-voltage systems. Consider the SSOP-48 package dimensions for board space constraints. Verify that the DIR and HD control signals can be properly managed to configure the desired data flow direction and output drive mode for the application.

Part Context

This device belongs to the SN74LVC161284 family of specialized interface ICs manufactured by Texas Instruments. It is part of the broader 74LVC logic series, characterized by low-voltage CMOS technology. The G4 suffix indicates a lead-free and environmentally friendly variant compliant with RoHS directives, distinguishing it from standard commercial versions while maintaining identical functional performance.

Replacement Considerations

SN74LVC161284DLR

FAQ

How does the HD control pin affect the output configuration?

When the HD pin is high, the outputs operate in a totem-pole configuration. When HD is low, the outputs switch to an open-drain configuration, which activates the integrated 1.4-kΩ pullup resistors.

What is the function of the VCC CABLE supply pin?

VCC CABLE supplies power specifically to the inputs and output buffers on the cable side. It supports operation from 3 V to 5.5 V, allowing the cable-side I/O pins to remain 5-V tolerant even when the main VCC is 3 V.