SN74HCT645DWR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HCT645DWR is an octal bus transceiver in a 20-pin SOIC package. It operates at a supply voltage of 4.5 V to 5.5 V with a typical propagation delay of 14 ns. The device provides ±6 mA output drive capability and features low input current of 1 µA maximum. It supports asynchronous two-way communication between data buses, utilizing direction control (DIR) and output enable (OE) inputs for data flow management.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides asynchronous bidirectional data transmission between A and B buses controlled by the DIR input
• Features high-current three-state outputs capable of driving up to 15 LSTTL loads
• Ensures electrical isolation of buses when the OE input is activated

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and signal buffering
• Clock drivers and bus transceivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix 'DWR' corresponds to the SOIC-20 tape and reel packaging configuration. Confirm that the active production status aligns with long-term availability requirements. Ensure the -40°C to 85°C operating temperature range meets environmental specifications. Validate RoHS compliance and lead finish details against project standards.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when TTL-compatible inputs are required within a CMOS system. The HCT logic family ensures compatibility with standard TTL voltage levels while maintaining CMOS power consumption characteristics. Consider the 20-SOIC package dimensions for PCB layout constraints and thermal dissipation needs relative to other available packages.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments SN74HCT series of octal bus transceivers. It shares functional similarities with the SN74HC645 but utilizes HCT technology for TTL input compatibility. The DWR suffix specifically denotes the SOIC package variant supplied in tape and reel format for automated assembly processes.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HCT645DW (Tube Packaging)

Buffers, Drivers, Receivers, Transceivers FAQ

How does the DIR input determine data flow?

When DIR is low, data transfers from the A bus to the B bus. When DIR is high, data transfers from the B bus to the A bus.

What is the function of the OE input?

Activating the OE input disables the device, effectively isolating the A and B buses from each other regardless of the DIR state.