Diodes 74AHCT138 User Manual

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

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

being high. The enable state occurs with E

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.

1 and E2, and one active

1 and E2 asserted low and

74AHCT138

3 TO 8 LINE DECODER DEMULTIPLEXER

Pin Assignments

Features

 Supply Voltage Range from 4.5V to 5.5V  Sinks or Sources 8mA at V

 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)

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.

= 4.5V

CC

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

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

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74AHCT138

Pin Descriptions

Pin Number Pin Name Description

1 A0 Address Input 0 2 A1 Address Input 1 3 A2 Address Input 2 4

5

6 E3 Enable Input 3 (active HIGH) 7 Y7 Output 7 (active LOW) 8 GND Ground

9 Y6 Output 6 (active LOW) 10 Y5 Output 5 (active LOW) 11 Y4 Output 4 (active LOW) 12 Y3 Output 3 (active LOW) 13 Y2 Output 2 (active LOW) 14 Y1 Output 1 (active LOW) 15 Y0 Output o (active LOW) 16

1

E

2

E

V

CC

Enable Input 1 (active LOW)

Enable Input 2 (active LOW)

Supply Voltage

Function Table Diagram

Control Input Output

E1 E2

H X X X X X H H H H H H H H X H X X X L L L H

74AHCT138

Document number: DS35483 Rev. 2 - 2

E3 A2 A1 A0

L L L H H H H H H H L L L H H H H H H H L H L H L H H H H H L H H L H H H H H H L H H H H L L H H H L H H H H H L H H H L H H H H H H H L H L H H H H H H H H H L H H H H H H H

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

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Logic Diagram

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74AHCT138

Absolute Maximum Ratings (Note 4) (@T

= +25°C, unless otherwise specified.)

A

Symbol Description Rating Unit

ESD HBM Human Body Model ESD Protection 2 KV

ESD CDM Charged Device Model ESD Protection 1 KV

ESD MM Machine Model ESD Protection 200 V

VCC

VI

Vo

IIK Input Clamp Current VI< -0.5V

IOK Output Clamp Current VO<-0.5V

IOK Output Clamp Current VO> VCC + 0.5V

IO

ICC Continuous current through VDD or GND

I

Continuous current through VDD or GND

GND

TJ

T

STG

P

TOT

Notes: 4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values and device operation should be within recommend values.

Supply Voltage Range -0.5 to +7.0 V

Input Voltage Range -0.5 to +7.0 V

Voltage applied to output in high or low state

-0.3 to VCC +0.5

V

-20 mA

25 mA

Continuous output current +/- 25 mA

75 mA

-75 mA

Operating Junction Temperature -40 to +150 °C

Storage Temperature -65 to +150 °C

Total Power Dissipation 500 mW

Recommended Operating Conditions (Note 5) (@T

= +25°C, unless otherwise specified.)

A

Symbol Parameter Conditions Min Max Unit

VCC

VI

VO

t/V

TA

Note: 5. Unused inputs should be held at VCC or Ground.

Supply Voltage 4.5 5.5 V

Input Voltage 0 5.5 V

Output Voltage Active Mode 0

Input transition Rise or Fall Rate

V

= 4.5V to 5.5V

CC

VCC

20 ns/V

V

Operating Free-Air Temperature -40 +125 °C

Electrical Characteristics (@T

= +25°C, unless otherwise specified.)

A

Symbol Parameter Test Conditions

V

IH

VIL

VOH

VOL

II

ICC

∆ICC

Ci

High-level Input Voltage

Low-level input voltage

High Level Output Voltage

Low-level Output Voltage

Input Current

Supply Current

Additional Supply Current per Input

Input Capacitance

4.5V to 5.5V 2.0

4.5V to 5.5V

= -50μA

I

OH

IOH = -8mA

= 50μA

I

OL

IOL = 8mA

VI = GND or 5.5V

= GND or VCC

V

I

= 0

O

= Vcc -2.1V

V

I

= 0

I

O

V

= V

or GND

i

CC

V

CC

A

Min Typ Max Min Max Min Max

 

4.5V 4.4 4.5

4.5V 3.94

4.5V

0V to 5.5V

5.5V

4.5V to 5.5V

5.5V



 

0.1 ±0.1



 



 

0 0.1

4 10

0.8



0.36

4.0

1.35

2.0



4.4

3.80



0.8



0.1

0.44

± 1

40

1.5

10

2.0



4.4

3.70



0.8 V



0.1

0.55

± 2 μA

80 μA

1.5 mA

10 pF

Unit

V

= +25°C TA = -40°C to +85°C TA = -40°C to +125°C

T

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Switching Characteristics

Symbol Parameter Test Conditions

Propagation Delay

n

An to Y

Propagation Delay

tPD

n

E3 to Y

Propagation Delay

n to Yn

E

Figure 2 C

Figure 2 CL = 50pF

Figure 2 C

Figure 2 CL = 50pF

Figure 2 C

Figure 2 CL = 50pF

=15pF

L

= 15pF

L

= 15pF

L

Operating Characteristics (@T

Parameter

Cpd

Power dissipation

capacitance

f = 1 MHz all outputs switching-no load 23 pF

= +25°C

T

V

CC

4.5V to 5.5V 0.5 4.4 10.4 1.0 12.0 1.0 13.0

4.5V to 5.5V 0.5 6.2 11.4 1.0 13.0 1.0 14.5

4.5V to 5.5V 0.5 4.3 9.1 1.0 10.5 1.0 11.5

4.5V to 5.5V 0.5 6.2 10.1 1.0 11.5 1.0 13.0

4.5V to 5.5V 0.5 4.3 9.6 1.0 11.0 1.0 12.0

4.5V to 5.5V 0.5 6.2 10.6 1.0 12.0 1.0 13.5

= +25°C, unless otherwise specified.)

A

Test

Conditions

A

Min Typ Max Min Max Min Max

V

CC

-40°C to +85°C -40°C to +125°C

= 5V

Typ

Unit

74AHCT138

Unit

ns

Parameter Measurement Information

V

CC

4.5V to 5.5V 3.0 V 3ns 1.5 V

Inputs

VI t

r/tf

Input Output

Voltage Waveform

Pulse Duration

V

M

V

/2

CC

C

L

15pF, 50pF

Notes: A. Includes test lead and test apparatus capacitance. B. All pulses are supplied at pulse repetition rate ≤ 10 MHz. C. Inputs are measured separately one transition per measurement. D. t

74AHCT138

Document number: DS35483 Rev. 2 - 2

PLH

and t

are the same as tPD.

PHL

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Voltage Waveform

Propagation Delay Times

Inverting and Non Inverting Outputs

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Ordering Information

74AHCT138

Figure 1. Load Circuit and Voltage Waveforms

Part Number Package Code Packaging

74AHCT138S16-13 S16 SO-16 2500/Tape & Reel -13 74AHCT138T16-13 T16 TSSOP-16 2500/Tape & Reel -13

Notes: 7. The taping orientation is located on our website at http://www.diodes.com/datasheets/ap02007.pdf

Quantity Part Number Suffix

7” Tape and Reel (Note 7)

Marking Information

(1) SO-16, TSSOP16

Part Number Package

74AHCT138S16 SO-16

74AHCT138T16 TSSOP-16

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



74AHCT138

Package Outline Dimensions (All dimensions in mm.)

Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.

Package Type: SO-16

H

E

L

Detail ‘A’

Gauge Plane



Dim Min Max

D

A2

A

B

e

A1

C

Detail ‘A’

Package Type: TSSOP-16

E/2

E

A

A1

Y

PIN 1

Ø0.760Depth0.050±0.02

A2

SEE DETAIL 'A'

E1

X



L1

DETAIL 'A'

x)



R1

L2

R

GAUGE PLANE

L



e

D

b

C

SEATING PLANE

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Dim Min Max Typ

A - 1.08 A1 0.05 0.15 - A2 0.80 0.93 -

b 0.19 0.30 -

c 0.09 0.20 -

D 4.90 5.10 -

E 6.40 BSC E1 4.30 4.50 -

e 0.65 BSC

L 0.45 0.75 - L1 1.00 REF L2 0.25 BSC

R 0.09 - - R1 0.09 - -

X - - 1.350

Y - - 1.050

Θ Θ1 5° 15° - Θ2 0° - -

All Dimensions in mm

SO-16

A 1.40 1.75 A1 0.10 0.25 A2 1.30 1.50

B 0.33 0.51

C 0.19 0.25

D 9.80 10.00

E 3.80 4.00

e 1.27 Typ

H 5.80 6.20

L 0.38 1.27

Θ

0 8

All Dimensions in mm

TSSOP-16

0° 8° -

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Suggested Pad Layout

Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.

Package Type: SO-16

X1

Y1

Pin 1

Y

X

C

Package Type: TSSOP-16

X1

Y1

1

X (16x)

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Y (16x)

C

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Dimensions Value (in mm)

C 1.270 X 0.670

X1 9.560

Y 1.450

Y1 6.400

Dimensions Value (in mm)

C 0.650 X 0.350

X1 4.900

Y 1.400

Y1 6.800

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74AHCT138

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages.

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Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes Incorporated.

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the

labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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IMPORTANT NOTICE

LIFE SUPPORT

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