SN74LS540NSR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS540NSR is an octal buffer and line driver manufactured by Texas Instruments, belonging to the 74LS logic series. It features eight inverting outputs with three-state capability, housed in a 20-pin SOIC surface-mount package. The device operates within a supply voltage range of 4.75V to 5.25V. Key electrical specifications include a high-level output current of -15mA and a low-level output current of 24mA. The propagation delay is specified at 15ns when operating at 5V. The component supports a commercial operating temperature range from 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides eight inverting buffer channels with three-state output control for bus-oriented communication systems.
• Utilizes Low-power Schottky (LS) TTL technology to balance switching speed with reduced power consumption.
• Features a 20-pin Small Outline Integrated Circuit (SOIC) package designed for surface-mount assembly.

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented systems requiring data buffering and direction control
• Memory address drivers for computer and telecommunications equipment
• Clock drivers and buffer circuits in digital logic designs

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'SR' corresponds to the tape-and-reel packaging configuration required for automated assembly processes. Confirm that the 74LS logic family compatibility aligns with existing system voltage levels and noise margins. Ensure the commercial temperature rating meets the operational environmental requirements of the final application without necessitating industrial-grade alternatives.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems that require octal data buffering with invert functionality and tri-state isolation. The LS series offers a suitable compromise between speed and power dissipation compared to standard TTL or higher-speed CMOS families. Consider the 20-pin SOIC footprint constraints and ensure adequate thermal management for the specified operating temperature range during continuous operation.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments SN74LS540 family of octal buffers. The 'SN' prefix indicates the manufacturer, while '74LS' denotes the Low-power Schottky logic family. The '540' identifies the specific octal buffer function with three-state outputs. The 'NSR' suffix specifies the 20-pin SOIC package type and reel-based packaging format for surface-mount technology applications.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct pin-compatible substitutes within the same logic family include the SN74LS540N (PDIP package) or SN74LS540D (SOIC package). For equivalent performance in different packaging, verify the SN74LS540DR variant. Cross-family replacements such as AHCT or LVC variants require careful evaluation of voltage level shifting and drive strength differences.