SN74HC640N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC640N 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 bidirectional data communication between two buses. The device features inverting logic controlled by direction (DIR) and output enable (OE) pins. It utilizes a 20-pin PDIP package and functions across a temperature range of -40°C to +85°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus transceiver architecture with 3-state outputs
• Bidirectional data transmission capability controlled by DIR pin
• Inverting logic functionality for signal processing
• Low power consumption characteristics

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Memory and memory-mapped I/O systems
• Driving LSTTL loads via high-current outputs

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current orderable addendum to confirm package type, lead finish, and moisture sensitivity level. Ensure the selected variant matches the required operating temperature range and RoHS compliance status for the intended application environment.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal bus interface with 3-state isolation is required. Consider the 2V to 6V operating range and CMOS input/output levels. Verify that the 20-pin PDIP package fits the board layout constraints and thermal requirements compared to alternative packages like SOIC or TSSOP.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SNx4HC640 family of octal bus transceivers. It is available in multiple package options including CDIP, SOIC, SOP, and TSSOP variants. The catalog version SN74HC640 represents the standard commercial grade, distinct from the military-grade SN54HC640.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include other SN74HC640 variants with different packaging such as SN74HC640DW or SN74HC640PWR. Cross-reference the package drawing and pinout to ensure mechanical compatibility before substitution.