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SN74S138A Status: ACTIVE

3-line to 8-line decoder / demultiplexer


      
         
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Datasheet

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 SN74S138A
Voltage Nodes(V)5  
Vcc range(V)4.75 to 5.25  
Input LevelTTL  
Output LevelTTL  
Output Drive(mA)-1/20  
Output2S  
From3  
To8  
RatingCatalog  
Technology FamilyS  
 Samples
 Inventory

Product Information

Features

  • Designed Specifically for High-Speed:
    • Memory Decoders
    • Data Transmission Systems
  • 3 Enable Inputs to Simplify Cascading and/or Data Reception
  • Schottky-Clamped for High Performance

 

Description

These Schottky-clamped TTL MSI circuits are designed to be used in high-performance memory decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of these decoders and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the Schottky-clamped system decoder is negligible.

The 'LS138, SN54S138, and SN74S138A decode one of eight lines dependent on the conditions at the three binary select inputs and the three enable inputs. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications.

All of these decoder/demultiplexers feature fully buffered inputs, each of which represents only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line-ringing and to simplify system design.

The SN54LS138 and SN54S138 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74LS138 and SN74S138A are characterized for operation from 0°C to 70°C.

 

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierFootprintsSamples
SN74S138ADACTIVE0 to 701.28 | 1kuSOIC (D) | 16 View 40 | TUBE Download CAD Format for this FootprintPurchase Samples
SN74S138ADE4ACTIVE0 to 701.28 | 1kuSOIC (D) | 16 View 40 | TUBE Download CAD Format for this FootprintPurchase Samples
SN74S138ADG4ACTIVE0 to 701.28 | 1kuSOIC (D) | 16 View 40 | TUBE Download CAD Format for this FootprintPurchase Samples
SN74S138ANACTIVE0 to 701.28 | 1kuPDIP (N) | 16 View 25 | TUBE Download CAD Format for this FootprintPurchase Samples
SN74S138AN3OBSOLETE0 to 70 PDIP (N) | 16 View   Download CAD Format for this FootprintNot Available
SN74S138ANE4ACTIVE0 to 701.28 | 1kuPDIP (N) | 16 View 25 | TUBE Download CAD Format for this FootprintPurchase Samples
SN74S138ANSRE4ACTIVE0 to 70 SO (NS) | 16 View   Download CAD Format for this FootprintPurchase Samples
SN74S138ANSRG4ACTIVE0 to 70 SO (NS) | 16 View   Download CAD Format for this FootprintPurchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 10:46 AM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 15 WeeksSN74S138AD
AmericasRochester Electronics >1k
WorldwideMouser Electronics 441
TI Lead Time*: 15 WeeksSN74S138ADE4
None Reported
View Distributors
TI Lead Time*: 15 WeeksSN74S138ADG4
None Reported
View Distributors
TI Lead Time*: 14 WeeksSN74S138AN
AmericasNewark 459
Rochester Electronics >1k
AsiaFarnell Asia 200
EuropeAvnet-SILICA 350
EBV Elektronik 13
Farnell 200
WorldwideDigiKey 639
Mouser Electronics 436
Call**SN74S138AN3
AmericasRochester Electronics >1k
TI Lead Time*: 14 WeeksSN74S138ANE4
WorldwideDigiKey  Available
Mouser Electronics 453
View all Distributors  

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
SN74S138AD RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
SN74S138ADE4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
SN74S138ADG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
SN74S138AN RoHS Compliant Pb-Free (RoHS) CU NIPDAU N/A for Pkg TypeViewView
SN74S138ANE4 RoHS Compliant Pb-Free (RoHS) CU NIPDAU N/A for Pkg TypeViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

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