SN74HC640PWR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC640PWR is an octal bus transceiver with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V and supports a maximum operating temperature of 85°C. The device features low power consumption with a maximum ICC of 80µA and typical propagation delay of 8ns at 4.5V. It utilizes a TSSOP-20 package for surface-mount installation.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture with 3-state outputs
• Direction control via DIR pin for bidirectional data flow
• Output isolation capability through OE pin
• CMOS input/output levels compatible with LSTTL loads

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Memory and memory interface systems
• Driving high-capacitance or capacitive loads

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package type, as the base part number covers multiple variants. Confirm RoHS compliance status and lead finish details from the manufacturer's current orderable addendum. Ensure the procurement channel provides valid traceability documentation for production-grade components.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing circuits requiring eight-channel bidirectional data transfer with isolated output states. Consider the HC logic series characteristics regarding switching speeds and drive capabilities relative to the target load requirements. Evaluate thermal performance constraints based on the TSSOP package configuration.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SNx4HC640 family of octal bus transceivers. It shares functional similarities with other members like SN74HC640DW but differs in physical packaging. The PWR suffix specifically denotes the TSSOP package variant available in tape and reel formats.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC640DWR (SOIC package)

Buffers, Drivers, Receivers, Transceivers FAQ

How is the direction of data transmission controlled?

Data flow direction is determined by the logic level applied to the DIR pin. A low level directs data from B to A, while a high level directs data from A to B.

What is the function of the OE pin?

The Output Enable (OE) pin controls the state of the outputs. When OE is high, all outputs are in a high-impedance state, effectively isolating the buses regardless of the DIR setting.