SN74HC640AN

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC640AN is an octal bus transceiver with 3-state outputs from the Texas Instruments HC logic family. It operates within a supply voltage range of 2V to 6V and supports an operating temperature range of -40°C to +85°C. The device features inverting logic, CMOS input/output levels, and low power consumption with a maximum ICC of 80µA. Typical propagation delay is 8ns at 5V, while maximum delays reach 190ns at 2V under specific load conditions.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture with 3-state outputs for asynchronous two-way communication
• Direction control via DIR pin allows data transmission between A and B buses
• Output enable (OE) pin isolates buses when disabled
• Inverting logic function with high-current drive capability

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Memory address drivers
• Clock drivers
• Bus-oriented architectures

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the package type matches the 'AN' designation, typically indicating a PDIP-20 housing. Confirm RoHS compliance status and lead finish details against the latest TI orderable addendum. Ensure the supplier provides valid traceability documentation for catalog-grade components.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring bidirectional data transfer with isolation capabilities. The HC series offers compatibility with standard CMOS logic families. Consider thermal impedance and package size constraints when choosing between available form factors like SOIC or TSSOP variants.

Buffers, Drivers, Receivers, Transceivers Part Context

Part of the SNx4HC640 family of octal bus transceivers. Includes military-grade SN54HC640 variants with extended temperature ranges. Available in multiple packages including CDIP, SOIC, PDIP, SO, and TSSOP configurations.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC640DW, SN74HC640N, SN74HC640PWR, SN74HC640NSR are direct package alternatives within the same functional family.

Buffers, Drivers, Receivers, Transceivers FAQ

How does the direction control work?

Data flows from A to B when DIR is Low, and from B to A when DIR is High.

What happens when OE is High?

The outputs enter a high-impedance state, effectively isolating the buses.