SN74LS240DB datasheet(14/41 Pages) TI1

14 / 41 page

Driver

1/8 'LS241/'S241

Repeater

1/8 'LS241/'S241

Input

2.9 V

Long-Line

1.6 V

1.2 V

0.3 V

Input

Output

Input

Output

Input

Output

Input

Output

Input

Output

Repeater

1/8 'LS241/'S241

Repeater

1/8 'LS241/'S241

Receiver

1/8 'LS241/'S241

Output

SN54LS240, SN54LS241, SN54LS244, SN54S240, SN54S241, SN54S244

SN74LS240, SN74LS241, SN74LS244, SN74S240, SN74S241, SN74S244

SDLS144D – APRIL 1985 – REVISED OCTOBER 2016

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Product Folder Links: SN54LS240 SN54LS241 SN54LS244 SN54S240 SN54S241 SN54S244 SN74LS240

SN74LS241 SN74LS244 SN74S240 SN74S241 SN74S244

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9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The SNx4LS24x, SNx4S24x octal buffers and line drivers are designed to be used for a multitude of bus

interface type applications where output drive or PCB trace length is a concern.

9.2 Typical Application

Figure 22. SNx4LS241 and SNx4S241 Used as Repeater or Level Restorer

9.2.1 Design Requirements

This device uses Schottky transistor logic technology. Take care to avoid bus contention because it can drive

currents that would exceed maximum limits. The high drive creates fast edges into light loads, so routing and

load conditions must be considered to prevent ringing.

9.2.2 Detailed Design Procedure

•

Power Supply

–

Each device must maintain a supply voltage between 4.5 V and 5.5 V.

•

Inputs

–

Input signals must meet the VIH and VIL specifications in Electrical Characteristics – SNx4LS24x.

–

Inputs leakage values (II, IIH, IIL) from Electrical Characteristics – SNx4LS24x must be considered.

•

Outputs

–

Output signals are specified to meet the VOH and VOL specifications in Electrical Characteristics –

SNx4LS24x as a minimum (the values could be closer to VCC for high signals or GND for low signals).

–

TI recommends maintaining output currents as specified in Recommended Operating Conditions.

–

The part can be damaged by sourcing or sinking too much current (see Electrical Characteristics –

SNx4LS24x for details).

SN74LS240DB Datasheet(PDF) 14 Page - Texas Instruments

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