Diodes 74AHCT138 Manuel d'utilisateur télécharger pdf

74AHCT138

Document number: DS35483 Rev. 2 - 2

1 of 9

www.diodes.com

June 2013

74AHCT138

3 TO 8 LINE DECODER DEMULTIPLEXER

Description

The 74AHCT138 is an advanced high speed CMOS device that is

designed to be pin compatable with 74LS low power Schottky types.

The device accepts a three bit binary weighted address on input pins

A0, A1 and A2 and when enabled will produce one active low output

with the remaining seven being high.

There are two active LOW enable inputs E

1 and E2, and one active

HIGH enable input E3. The disabled device state results in all outputs

being high. The enable state occurs with E

1 and E2 asserted low and

E3 asserted high.

The multiple enable lines allow for the parallel expansion of decoders

to create 4-to-16 line versions with no additional parts and 5-to-32

versions with the addition of a single inverter.

Features

 Supply Voltage Range from 4.5V to 5.5V

 Sinks or Sources 8mA at V

= 4.5V

 CMOS Low Power Consumption

 Schmitt Trigger Action at All Inputs

 Inputs Accept up to 6.0V

 ESD Protection Tested per JESD 22

 Exceeds 200-V Machine Model (A115-A)

 Exceeds 2000-V Human Body Model (A114-A)

 Exceeds 1000-V Charged Device Model (C101C)

 Latch-Up Exceeds 250mA per JESD 78, Class II

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

Applications

 Memory chip select decoding

 Demultiplexing

 Single line peripheral control

 Allow simple serial bit streams from a microcontroller to control as

many peripheral lines as needed

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Click here for ordering information, located at the end of datasheet

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Page 1 - 74AHCT138

74AHCT138 Document number: DS35483 Rev. 2 - 2 1 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT1383 TO 8 LINE DECODER DEMULTIPLEXER Des

Page 2 - Function Table Diagram

74AHCT138 Document number: DS35483 Rev. 2 - 2 2 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT138 Pin Descriptions Pin Number Pin Na

Page 3 - Logic Diagram

74AHCT138 Document number: DS35483 Rev. 2 - 2 3 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT138 Logic Diagram

Page 4 - (Note 5) (@T

74AHCT138 Document number: DS35483 Rev. 2 - 2 4 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT138 Absolute Maximum Ratings (Note 4) (

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74AHCT138 Document number: DS35483 Rev. 2 - 2 5 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT138 Switching Characteristics Symbol P

Page 6

74AHCT138 Document number: DS35483 Rev. 2 - 2 6 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT138Figure 1. Load Circuit and Voltage Wa

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74AHCT138 Document number: DS35483 Rev. 2 - 2 7 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT138 Package Outline Dimensions (All dim

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74AHCT138 Document number: DS35483 Rev. 2 - 2 8 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT138 Suggested Pad Layout Please see AP0

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74AHCT138 Document number: DS35483 Rev. 2 - 2 9 of 9 www.diodes.com June 2013© Diodes Incorporated 74AHCT138 IMPORTANT NOTICE DIODES INCORPORAT

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