SN74LS645-1NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS645-1NS is an octal bus transceiver from the Texas Instruments 74LS logic series, housed in a 20-pin SOIC package. It provides bidirectional data transmission with three-state outputs and non-inverting functionality. The device operates within a supply voltage range of 4.75 V to 5.25 V, supporting TTL input and output levels. Key electrical characteristics include a maximum propagation delay of 15 ns under specific load conditions and output drive capabilities of up to 48 mA in the low state.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal configuration enabling simultaneous eight-bit data transfer between two buses
• Three-state outputs allowing direct connection to system data lines without additional buffering
• Non-inverting signal path preserving logical polarity during bidirectional transmission

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data communication on microprocessor-based system buses
• Memory interface circuits requiring high-drive capability for reliable signal integrity
• Control signal routing in industrial automation systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the suffix '1N' corresponds to the standard 20-pin SOIC package variant. Confirm RoHS compliance status as manufacturing specifications may vary by production batch. Ensure the supplier provides official datasheets matching the exact part number to validate pinout and electrical ratings before integration into design schematics.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with higher current drive than standard LS variants is required. The 48 mA low-level output current supports heavier capacitive loads compared to basic logic families. Verify that the 15 ns propagation delay meets the timing constraints of the target application's clock speed and bus architecture requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the widely adopted 74LS (Low-power Schottky) family, known for balancing speed and power consumption. The SN74LS645 specifically addresses applications needing robust bidirectional data handling. Its design complements other 74-series components, facilitating modular expansion in digital logic systems while maintaining compatibility with standard TTL logic thresholds.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The SN74LS645-1NE4 is a verified equivalent variant offering identical functional specifications. Both parts share the same octal bus transceiver architecture and electrical performance metrics. Substitution requires confirming package compatibility and verifying that any environmental or compliance markings align with project requirements.