SN74LS240N

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS240N is an octal buffer and line driver manufactured by onsemi, utilizing Low Power Schottky (LS) TTL technology. It features two independent 4-bit drivers with inverted outputs and 3-state capabilities. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a maximum propagation delay of 15 ns at 5 V. It includes input hysteresis for improved noise margins and PNP inputs to reduce DC loading. The component is housed in a standard 20-pin PDIP package.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Features 3-state outputs that allow direct connection to bus lines or memory address registers.
• Incorporates built-in input hysteresis to enhance noise immunity and signal integrity.
• Utilizes PNP input structures to minimize DC loading effects on driving circuits.

Buffers, Drivers, Receivers, Transceivers Applications

• Memory address drivers
• Clock drivers
• Bus-oriented transmitters and receivers

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the manufacturer designation matches onsemi specifications rather than Texas Instruments datasheets. Confirm the 'N' suffix corresponds to the PDIP-20 plastic dual in-line package. Ensure compliance with RoHS directives if required by the specific procurement contract.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring high fan-out and improved PCB density for bus interfaces. It is suitable for applications needing isolated input-to-output buffering with active-low control signals. Consider its compatibility with mixed 3.3-V and 5-V logic environments due to tolerant input characteristics.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SNx4LS24x family of octal buffers and line drivers. It shares functional similarities with the SN74LS241 (non-inverting) and SN74LS244 (non-inverting), differing primarily in output polarity. The LS series offers a balance of speed and power consumption compared to standard TTL logic families.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74LS241N: Non-inverting equivalent with identical pinout and package.

Buffers, Drivers, Receivers, Transceivers FAQ

How does the SN74LS240 handle mixed-voltage logic levels?

The inputs are tolerant down to 2 V, allowing compatibility with 3.3-V or 2.5-V logic inputs while operating from a 5-V supply.

What is the function of the G pins on this device?

The G pins serve as symmetrical, active-low output-control inputs. When G is high, all outputs enter a high-impedance state; when low, data passes from A inputs to Y outputs.