SN74LS640N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS640N is an octal bus transceiver manufactured by Texas Instruments, belonging to the SN74LS logic series. It features eight bidirectional data channels with three-state outputs housed in a 20-pin PDIP package. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports TTL input and output levels. Key electrical characteristics include a propagation delay of 15 ns, a low-level output current of 24 mA, and a high-level output current of -15 mA. It functions reliably across an operating temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides bidirectional data transmission across eight independent channels
• Features three-state outputs for effective bus line isolation
• Supports TTL-compatible input and output signal levels

Buffers, Drivers, Receivers, Transceivers Applications

• Memory module data bus interfacing
• Microprocessor system data routing
• Control signal distribution networks

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the ordering suffix 'N' corresponds to the active production PDIP package variant. Confirm RoHS compliance status and lead finish specifications (NIPDAU) against the latest Package Option Addendum. Ensure the procurement channel provides valid traceability documentation for catalog-grade components.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring eight-bit wide data transfer with TTL compatibility. Verify that the required propagation delay and drive current capabilities align with the circuit's timing constraints. Consider alternative packages such as SOIC or SOP if surface-mount technology is preferred over through-hole mounting.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74LS640 family of octal bus transceivers with three-state outputs. It serves as a standard catalog product designed for general-purpose digital logic applications. The device facilitates efficient data flow management between multiple sources and destinations on a shared bus architecture.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS640-1N

Buffers, Drivers, Receivers, Transceivers FAQ

What is the specific function of the three-state outputs?

The three-state outputs allow the device to disconnect from the bus when not actively driving signals, preventing signal contention during bidirectional data transfers.

Does the SN74LS640N support CMOS input levels?

No, the datasheet specifies that the SN74LS640N utilizes TTL input levels, which differ from standard CMOS voltage thresholds.