SN74HC645DWG4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC645DWG4 is an octal bus transceiver in a 20-pin SOIC package. It supports a supply voltage range of 2 V to 6 V and operates within a temperature range of -40°C to +85°C. The device features high-current 3-state outputs capable of driving up to 15 LSTTL loads, with output drive currents of ±6 mA at 5 V. Typical propagation delay is 12 ns. Maximum ICC is 80 µA, and maximum input current is 1 µA.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Designed for asynchronous two-way communication between data buses
• Direction control determines data flow from A bus to B bus or vice versa
• Output-enable input isolates buses when disabled

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented memory and logic systems
• High-current 3-state output buffering

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the G4 suffix indicates lead-free and RoHS-compliant manufacturing. Confirm the DW package corresponds to the standard SOIC-20 footprint. Ensure the operating temperature range matches the system requirements of -40°C to +85°C. Check datasheet revisions for any updates to electrical characteristics or pin configurations before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring wide voltage operation from 2 V to 6 V. The HC series offers low power consumption suitable for battery-operated devices. High-current outputs allow direct interfacing with LSTTL loads without additional buffers. Verify that the 20-pin SOIC package fits the available PCB space and thermal constraints.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments SN74HC645 family of octal bus transceivers. It is a catalog version of the military-grade SN54HC645. The device provides non-inverting transmission with direction control and output enable functions, serving as a standard interface solution for parallel data buses in digital logic systems.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC645DWR (Tape and reel variant)

Buffers, Drivers, Receivers, Transceivers FAQ

How does the DIR input control data flow?

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

What is the function of the OE input?

The output-enable (OE) input disables the device when high, effectively isolating the buses regardless of the DIR state.