SN74ALS240A-1NSR

$1.21

Description：IC BUFFER INVERT 5.5V 20SO
Series：74ALS
Mfr：Texas Instruments
Package：Tape & Reel (TR),Cut Tape (CT),Bulk

SKU:ff567c921208 Category: Buffers, Drivers, Receivers, Transceivers Brand: Texas Instruments

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Product introduction

Product Detailed Parameters

Description：IC BUFFER INVERT 5.5V 20SO
Series：74ALS
Mfr：Texas Instruments
Package：Tape & Reel (TR),Cut Tape (CT),Bulk
Logic Type：Buffer, Inverting
Number of Elements：2
Number of Bits per Element：4
Input Type：-
Output Type：3-State
Current - Output High, Low：15mA, 48mA
Voltage - Supply：4.5V ~ 5.5V
Operating Temperature：0°C ~ 70°C (TA)
Mounting Type：Surface Mount
Package / Case：20-SOIC (0.209", 5.30mm Width)
Supplier Device Package：20-SO
Grade：-
Qualification：-

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SN74ALS240A-1NSR

Overview

The SN74ALS240A-1NSR is a dual four-bit bus driver manufactured by Texas Instruments, belonging to the ALS logic family. It features three-state outputs and inverted polarity, housed in a 20-pin SOIC package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a low-level output current of 24 mA with a high-level output current of -15 mA. Propagation delay is specified at 9 ns under nominal supply conditions, with an operating temperature range from 0°C to +70°C.

Feature Summary

Dual four-bit configuration providing independent control over two data buses
Three-state outputs allowing direct connection to system buses without additional drivers
Inverted polarity for signal direction management

Applications

Bus-oriented memory and address drivers
Clock drivers and buffer circuits
Multiplexer receivers

Procurement Notes

Verify the specific suffix 'SR' indicates tape-and-reel packaging when ordering. Confirm that the component meets RoHS standards as per manufacturer documentation. Ensure compatibility with standard surface-mount assembly processes for SOIC-20 packages. Cross-reference datasheet revisions to confirm pinout consistency with existing designs.

Selection Notes

Select this component for applications requiring bidirectional data transfer with inversion. The ALS series offers improved speed-over-power characteristics compared to standard TTL. Verify that the load capacitance and drive requirements align with the specified 24 mA low-level output capability. Consider thermal dissipation limits for dense PCB layouts.

Part Context

This part belongs to the SN74ALS240A family of octal bus transceivers. It serves as a successor to earlier 74S and 74LS series devices, offering faster switching speeds while maintaining lower power consumption. The device is widely used in digital systems requiring reliable bus isolation and signal buffering.