DS34C87TJ

Overview

The DS34C87TJ is a CMOS quad tri-state differential line driver manufactured by National Semiconductor, designed to meet EIA standard RS-422 requirements. It features four independent drivers with separate enable inputs, allowing flexible bus management. The device operates on a single 5V supply and accepts TTL or CMOS input levels, converting them to RS-422 compliant output voltages. Key electrical characteristics include a typical propagation delay of 6 ns and low static current consumption. The component is housed in a plastic small outline package (SOIC) suitable for surface-mount applications.

Feature Summary

• CMOS technology ensures low power consumption while maintaining high-speed data transmission capabilities.
• Tri-state outputs allow multiple drivers to share a common bus without signal interference when disabled.
• Independent enable inputs provide precise control over individual driver activation for complex system architectures.

Applications

• Balanced line digital data transmission systems
• RS-422 compliant communication interfaces
• High-speed serial data buses

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor's semiconductor division was acquired by Texas Instruments. Ensure the part number suffix matches the specific package and temperature grade required for your design. Confirm RoHS compliance status through official datasheets, as legacy parts may have different environmental certifications than current equivalents.

Selection Notes

Select this component when an RS-422 interface requires four differential drivers with tri-state capability. Compare against the DS34LV87 series if lower voltage operation (3.3V) is needed instead of the standard 5V requirement. Ensure the SOIC package footprint aligns with your PCB layout constraints and that the operating temperature range meets your environmental specifications.

Part Context

This component belongs to the DS34C87 family of quad differential line drivers. It serves as a predecessor or parallel variant to Texas Instruments' continued production lines following the acquisition of National Semiconductor. The 'J' suffix typically denotes a specific package variant or temperature rating within the original National Semiconductor cataloging system.

Replacement Considerations

The DS34C87TM/NOPB is a direct functional equivalent from Texas Instruments. Verify pin compatibility and electrical parameters before substitution. Other compatible alternatives include the ST26C31 from STMicroelectronics or the DS26C31 from National/TI, provided they meet the specific voltage and speed requirements of the application.