SN74HC640PW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74HC640PW 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 features inverting logic. The device utilizes a 20-pin TSSOP package with dimensions of 4.40 mm x 6.50 mm. Recommended operating conditions specify a temperature range of -40°C to +85°C. Electrical characteristics include a maximum high-level output current of -7.8 mA and a low-level output current of 7.8 mA at 6V. Propagation delay is typically 8 ns at 6V with a 50 pF load, increasing to 41 ns max at 6V with a 150 pF load.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal configuration providing eight bidirectional data channels controlled by direction and output enable pins.
• High-current 3-state outputs capable of driving up to 10 LSTTL loads for robust signal transmission.
• Low power consumption design with a maximum supply current of 80 µA.
• CMOS input levels compatible with standard digital logic interfaces.

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses.
• Memory and memory interface systems requiring bidirectional data transfer.
• Driving transceivers on multiple buses for system interconnects.

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix and package type when sourcing, as availability may vary. Confirm that the component meets the required RoHS compliance standards for your assembly process. Ensure proper handling precautions are taken due to electrostatic discharge sensitivity. Check the manufacturer's documentation for any recent lifecycle status changes or obsolescence notices before finalizing procurement plans.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for applications requiring wide voltage operation between 2V and 6V. Consider the TSSOP package constraints regarding thermal impedance and board space. Evaluate the propagation delay specifications against your system timing requirements under expected load conditions. Ensure unused inputs are tied to defined logic levels to prevent undefined operational states.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SNx4HC640 family of octal bus transceivers from Texas Instruments. The family includes variants with different packages such as SOIC, PDIP, and CDIP. The HC series denotes high-speed CMOS technology, offering performance improvements over older logic families while maintaining compatibility with standard TTL loads.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74HC640PWR is an active production version of the same logical function in the same TSSOP-20 package. Verify pinout and electrical specifications match if substituting obsolete inventory.