TEXAS INSTRUMENTS CD74AC138 Technical data

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Data sheet acquired from Harris Semiconductor
SCHS234

CD74A C138, CD74ACT138,

CD74A C238, CD74ACT238

[ /Title
(CD74
AC138
,
CD74
ACT13
8,
CD74
AC238
,
CD74
ACT23

8)
/Sub­ject (3­to-8­Line
Decod­ers/De
multi­plex­ers)
/Autho
r ()
/Key­words
(Har­ris
Semi­con­ductor,
Advan
ced

September 1998

Features

• CD74AC138, CD74ACT138 . . . . . . . . . . . . . . . Inverting

• CD74AC238, CD74ACT238 . . . . . . . . . . . Non-Inverting

• Buffered Inputs

• Typical Propagation Delay

- 5ns at V

• Exceeds 2kV ESD Protection MIL-STD-883, Method
3015

• SCR-Latchup-Resistant CMOS Process and Circuit
Design

• Speed of Bipolar FAST™/AS/S with Significantly
Reduced Power Consumption

• Balanced Propagation Delays

• AC Types Feature 1.5V to 5.5V Operation and
Balanced Noise Immunity at 30% of the Supply

• ±24mA Output Drive Current

- Fanout to 15 FAST™ ICs

- Drives 50Ω Transmission Lines

= 5V, TA = 25oC, CL = 50pF

CC

Pinout

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238

(PDIP, SOIC)

TOP VIEW

V

A0
A1
A2
E1
E2
E3

AC/ACT138
AC/ACT238 Y7

Y7

GND

1
2
3
4
5
6
7
8

16

CC

Y0 AC/ACT138

15

Y0 AC/ACT238
Y1 AC/ACT138

14

Y1 AC/ACT238
Y2 AC/ACT138

13

Y2 AC/ACT238
Y3 AC/ACT138

12

Y3 AC/ACT238
Y4 AC/ACT138

11

Y4 AC/ACT238
Y5 AC/ACT138

10

Y5 AC/ACT238

9

Y6 AC/ACT138
Y6 AC/ACT238

3-to-8-Line Decoders/Demultiplexers

Description

The CD74AC138, CD74ACT138, CD74AC238, and
CD74ACT238 are 3-to-8-line decoders/demultiplexers that
utilize the Harris Advanced CMOS Logic technology. Both
circuits have three binary select inputs (A0, A1, and A2). If
the device is enabled, these inputs determine which one of
the eight normally HIGH outputs of the AC/ACT138 will go
LOW or which on of the normally LOW outputs of the
AC/ACT238 will go HIGH. Two active LOW and one active
HIGH enables (
cascading of these devices.

Ordering Information

PART

NUMBER

CD74AC138E 0 to 70oC, -40 to 85,

CD74ACT138E 0 to 70oC, -40 to 85,

CD74AC238E 0 to 70oC, -40 to 85,

CD74ACT238E 0 to 70oC, -40 to 85,

CD74AC138M 0 to 70oC, -40 to 85,

CD74ACT138M 0 to 70oC, -40 to 85,

CD74AC238M 0 to 70oC, -40 to 85,

CD74ACT238M 0 to 70oC, -40 to 85,

NOTES:

17. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.

18. Waferanddieforthis part number is availablewhich meets all elec­trical specifications. Please contact your local sales office or Harris
customer service for ordering information.

E1, E2 and E3) are provided to simplify the

TEMP.

RANGE (oC) PACKAGE

16 Ld PDIP E16.3

-55 to 125
16 Ld PDIP E16.3

-55 to 125
16 Ld PDIP E16.3

-55 to 125
16 Ld PDIP E16.3

-55 to 125
16 Ld SOIC M16.15

-55 to 125
16 Ld SOIC M16.15

-55 to 125
16 Ld SOIC M16.15

-55 to 125
16 Ld SOIC M16.15

-55 to 125

PKG.

NO.

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
FAST™ is a Trademark of Fairchild Semiconductor.

Copyright

© Harris Corporation 1998

1

File Number 1909.1

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238

Functional Diagram

AC/ACT

AC/ACT

238

Y1

Y2

Y3

Y4

Y5

Y6

Y7

138

Y0

Y1

Y2

Y3

Y4

Y5

Y6

Y7

OUTPUTSENABLE ADDRESS

1

A0 Y0

2

A1

3

A2

4

E1

5

E2

6

E3

15

14

13

12

11

10

9

7

CD74AC/ACT138 TRUTH TABLE

INPUTS

(NOTE 4)

E

3

E0 A

2

A

1

A

0

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

XH XXXHHHHHHHH
LX XXXHHHHHHHH
HL LL LLHHHHHHH
HL LLHHLHHHHHH
HL LHLHHLHHHHH
HL LHHHHHLHHHH
HL HLLHHHHLHHH
HL HLLHHHHHLHH
HL HHLHHHHHHLH
HL HHHHHHHHHHL

CD74AC/ACT238 TRUTH TABLE

INPUTS

OUTPUTSENABLE ADDRESS

(NOTE 4)

E

3

E0 A

2

A

1

A

0

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

XHXXXLLLLLLLL
LX XXXLLLLLLLL
HL LLLHLLLLLLL
HL LLHLHLLLLLL
HL LHLLLHLLLLL
HL LHHLLLHLLLL
HL HLLLLLLHLLL
HL HLHLLLLLHLL
HL HHLLLLLLLHL
HL HHHLLLLLLLH

NOTES:

19. H = High Level, L = Low Level, X = Don’t Care

20.

E0 = E1 + E2

2

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238

Absolute Maximum Ratings Thermal Information

DC Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 6V

DC Input Diode Current, I

IK

For VI < -0.5V or VI > VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . .±20mA

DC Output Diode Current, I

OK

For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA

DC Output Source or Sink Current per Output Pin, I

O

For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±50mA

DC VCC or Ground Current, I

CC orIGND

(Note 5) . . . . . . . . .±100mA

Operating Conditions

Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC

Supply Voltage Range, VCC (Note 6)

AC Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.5V to 5.5V

ACT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V

DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to V

Input Rise and Fall Slew Rate, dt/dv

AC Types, 1.5V to 3V . . . . . . . . . . . . . . . . . . . . . . . . . 50ns (Max)

AC Types, 3.6V to 5.5V. . . . . . . . . . . . . . . . . . . . . . . . 20ns (Max)

ACT Types, 4.5V to 5.5V. . . . . . . . . . . . . . . . . . . . . . . 10ns (Max)

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

21. For up to 4 outputs per device, add ±25mA for each additional output.

22. Unless otherwise specified, all voltages are referenced to ground.

23. θJA is measured with the component mounted on an evaluation PC board in free air.

Thermal Resistance (Typical, Note 7) θJA (oC/W)

PDIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Maximum Junction Temperature (Plastic Package) . . . . . . . . . . 150oC

Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300oC

CC

DC Electrical Specifications

PARAMETER SYMBOL

AC TYPES

High Level Input Voltage V

Low Level Input Voltage V

High Level Output Voltage V

IH

IL

OH

TEST

CONDITIONS

(V) IO(mA) MIN MAX MIN MAX MIN MAX

I

V

CC

(V)

25

o

C

-40oC TO
85oC

-55oC TO
125oC

- - 1.5 1.2 - 1.2 - 1.2 - V
3 2.1 - 2.1 - 2.1 - V

5.5 3.85 - 3.85 - 3.85 - V

- - 1.5 - 0.3 - 0.3 - 0.3 V
3 - 0.9 - 0.9 - 0.9 V

5.5 - 1.65 - 1.65 - 1.65 V

VIH or V

-0.05 1.5 1.4 - 1.4 - 1.4 - V

IL

-0.05 3 2.9 - 2.9 - 2.9 - V

-0.05 4.5 4.4 - 4.4 - 4.4 - V

-4 3 2.58 - 2.48 - 2.4 - V

-24 4.5 3.94 - 3.8 - 3.7 - V

-75

5.5 - - 3.85 - - - V

(Note 8, 9)

-50

5.5----3.85 - V

(Note 8, 9)

UNITSV

3

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238

DC Electrical Specifications (Continued)

PARAMETER SYMBOL

Low Level Output Voltage V

OL

TEST

CONDITIONS

(V) IO(mA) MIN MAX MIN MAX MIN MAX

I

VIH or V

0.05 1.5 - 0.1 - 0.1 - 0.1 V

IL

V

CC

(V)

25

o

C

0.05 3 - 0.1 - 0.1 - 0.1 V

0.05 4.5 - 0.1 - 0.1 - 0.1 V
12 3 - 0.36 - 0.44 - 0.5 V
24 4.5 - 0.36 - 0.44 - 0.5 V
75

5.5 - - - 1.65 - - V

(Note 8, 9)

50

5.5-----1.65 V

(Note 8, 9)

Input Leakage Current I

I

VCC or

- 5.5 - ±0.1 - ±1-±1µA

GND

Quiescent Supply Current
MSI

I

CC

VCC or

GND

0 5.5 - 8 - 80 - 160 µA

ACT TYPES

High Level Input Voltage V

IH

- - 4.5 to

2-2-2-V

5.5

Low Level Input Voltage V

IL

- - 4.5 to

- 0.8 - 0.8 - 0.8 V

5.5

High Level Output Voltage V

OH

VIH or V

-0.05 4.5 4.4 - 4.4 - 4.4 - V

IL

-24 4.5 3.94 - 3.8 - 3.7 - V

-75

5.5 - - 3.85 - - - V

(Note 8, 9)

-50

5.5----3.85 - V

(Note 8, 9)

Low Level Output Voltage V

OL

VIH or V

0.05 4.5 - 0.1 - 0.1 - 0.1 V

IL

24 4.5 - 0.36 - 0.44 - 0.5 V
75

5.5 - - - 1.65 - - V

(Note 8, 9)

50

5.5-----1.65 V

(Note 8, 9)

Input Leakage Current I

I

VCC or

- 5.5 - ±0.1 - ±1-±1µA

GND

Quiescent Supply Current
MSI

AdditionalSupplyCurrent per
Input Pin TTL Inputs High

I

CC

VCC or

GND

∆I

CC

V

CC

-2.1

0 5.5 - 8 - 80 - 160 µA

- 4.5 to

- 2.4 - 2.8 - 3 mA

5.5

1 Unit Load

NOTES:

24. Test one output at a time for a 1-second maximum duration. Measurement is made by forcing current and measuring voltage to minimize
power dissipation.

o

25. Test verifies a minimum 50Ω transmission-line-drive capability at 85

C, 75Ω at 125oC.

-40oC TO
85oC

-55oC TO
125oC

UNITSV

ACT Input Load Table

INPUT UNIT LOAD

A0-A2 0.83

E1, E2 1

E3 0.42

NOTE: Unit load is ∆ICClimit specified in DC Electrical Specifications
Table, e.g., 2.4mA max at 25oC.

4

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238

Switching Specifications Input t

PARAMETER SYMBOL V

AC TYPES

Propagation Delay,
An to Output
(CD74AC/ACT138)

Propagation Delay,
E1, E2 to Output
(CD74AC/ACT138)

Propagation Delay,
E3 to Output
(CD74AC/ACT138)

Propagation Delay,
An to Output
(CD74AC/ACT238)

Propagation Delay,
E1, E2 to Output
(CD74AC/ACT238)

Propagation Delay,
E3 to Output
(CD74AC/ACT238)

Input Capacitance C
Power Dissipation Capacitance C

ACT TYPES

Propagation Delay,
An to Output
(CD74AC/ACT138)

Propagation Delay,
E1, E2 to Output
(CD74AC/ACT138)

Propagation Delay,
E3 to Output
(CD74AC/ACT138)

Propagation Delay,
An to Output
(CD74AC/ACT238)

Propagation Delay,
E1, E2 to Output
(CD74AC/ACT238)

t

PLH

t

PLH

t

PLH

t

PLH

t

PLH

t

PLH

(Note 13)

t

PLH

t

PLH

t

PLH

t

PLH

t

PLH

, tf = 3ns, CL= 50pF (Worst Case)

r

(V)

CC

, t

PHL

1.5 - - 125 - - 138 ns

3.3

4 - 14 3.9 - 15.4 ns

(Note 11)

5

2.8 - 10 2.8 - 11 ns

(Note 12)

, t

PHL

1.5 - - 114 - - 125 ns

3.3 3.6 - 12.7 3.5 - 14 ns
5 2.6 - 9.1 2.5 - 10 ns

, t

PHL

1.5 - - 125 - - 138 ns

3.3 4 - 14 3.9 - 15.4 ns
5 2.8 - 10 2.8 - 11 ns

, t

PHL

1.5 - - 170 - - 187 ns

3.3 5.4 - 19.1 5.3 - 21 ns
5 3.9 - 13.6 3.8 - 15 ns

, t

PHL

1.5 - - 135 - - 149 ns

3.3 4.3 - 15.2 4.2 - 16.7 ns
5 3.1 - 10.7 3 - 11.9 ns

, t

PHL

1.5 - - 189 - - 208 ns

3.3 6 - 21.1 5.8 - 23.2 ns
5 4.3 - 15.1 4.2 - 16.6 ns

- - -10- -10pF

- - 110 - - 110 - pF

5

3.1 - 10.9 3 - 12 ns

PD

, t

I

PHL

(Note 12)

, t

PHL

, t

PHL

, t

PHL

, t

PHL

5 2.7 - 9.5 2.6 - 10.5 ns

5 2.8 - 10 2.8 - 11 ns

5 4 - 14.2 3.9 - 15.6 ns

5 3.7 - 12.9 3.6 - 14.2 ns

-40oC TO 85oC -55oC TO 125oC
UNITSMIN TYP MAX MIN TYP MAX

5

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238

Switching Specifications Input t

, tf = 3ns, CL= 50pF (Worst Case) (Continued)

r

-40oC TO 85oC -55oC TO 125oC

PARAMETER SYMBOL V

Propagation Delay,

t

PLH

, t

PHL

(V)

CC

5 3.5 - 12.4 3.4 - 13.6 ns
E3 to Output
(CD74AC/ACT238)

Input Capacitance C
Power Dissipation Capacitance C

I

PD

- - -10- -10pF

- - 110 - - 110 - pF

(Note 13)

NOTES:

26. Limits tested at 100%.

27. 3.3V Min at 3.6V, Max at 3V.

28. 5V Min at 5.5V, Max at 4.5V.

29. CPD is used to determine the dynamic power consumption per package.
AC: PD = V
ACT: PD = V

tr = 3ns

INPUT

2

fi(CPD + CL)

CC

2

fi(CPD + CL) + VCC∆ICC where fi = input frequency, CL = output load capacitance, VCC = supply voltage.

CC

= 3ns

t

f

90%
V

S

10%

GND

E1, E2

E3

= 3ns

t

r

INPUT

= 3ns

t

f

UNITSMIN TYP MAX MIN TYP MAX

90%
V

S

GND

138 OUTPUT

238 OUTPUT

t

PLH

t

PHL

t

PLH

t

PHL

V

S

V

S

FIGURE 8. PROPAGATION DELAY TIMES FIGURE 9. PROPAGATION DELAY TIMES

OUTPUT

R

(NOTE)

L

C

L

50pF

500Ω

DUT

OUTPUT

LOAD

NOTE: For AC Series Only: When VCC = 1.5V, RL = 1kΩ.

CD74AC CD74ACT

Input Level V
Input Switching Voltage, V
Output Switching Voltage, V

S

S

0.5 V

0.5 V

CC

CC
CC

FIGURE 10. PROPAGATION DELAY TIMES

3V

1.5V

0.5 V

CC

138 OUTPUT

238 OUTPUT

t

t

PHL

PLH

t

PLH

t

PHL

V

S

V

S

6

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