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SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

 

 

SCAS291I – MARCH 1993 – REVISED OCTOBER 1998

1

POST OFFICE BOX 655303 

 DALLAS, TEXAS 75265

D

EPIC

 (Enhanced-Performance Implanted

CMOS) Submicron Process

D

ESD Protection Exceeds 2000 V Per

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

D

Latch-Up Performance Exceeds 250 mA Per

JESD 17

D

Typical V

OLP

 (Output Ground Bounce)

< 0.8 V at V

CC

 = 3.3 V, T

A

 = 25

°

C

D

Typical V

OHV

 (Output V

OH

 Undershoot)

> 2 V at V

CC

 = 3.3 V, T

A

 = 25

°

C

D

Inputs Accept Voltages to 5.5 V

D

Package Options Include Plastic

Small-Outline (D), Shrink Small-Outline

(DB), and Thin Shrink Small-Outline (PW)

Packages, Ceramic Chip Carriers (FK) and

Flat (W) Package, and DIPs (J)

description

The SN54LVC138A 3-line to 8-line decoder/

demultiplexer is designed for 2.7-V to 3.6-V V

CC

operation and the SN74LVC138A 3-line to 8-line

decoder/demultiplexer is designed for 1.65-V to

3.6-V V

CC

 operation.

The ’LVC138A devices are designed for high-

performance memory-decoding or data-routing

applications requiring very short propagation

delay times. In high-performance memory systems, these decoders 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 decoders is negligible.

The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two

active-low enable inputs and one active-high enable input 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.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators

in a mixed 3.3-V/5-V system environment.

The SN54LVC138A is characterized for operation over the full military temperature range of –55

°

C to 125

°

C.

The SN74LVC138A is characterized for operation from –40

°

C to 85

°

C.

Copyright 

©

 1998, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

 

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

EPIC is a trademark of Texas Instruments Incorporated.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A

B

C

G2A

G2B

G1

Y7

GND

V

CC

Y0

Y1

Y2

Y3

Y4

Y5

Y6

SN54LVC138A . . . J  OR  W  PACKAGE

SN74LVC138A . . . D, DB, OR PW PACKAGE

(TOP VIEW)

3

2 1 20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

Y1

Y2

NC

Y3

Y4

C

G2A

NC

G2B

G1

B

A

NC

Y6

Y5

V

Y0

Y7

GND

NC

SN54LVC138A . . . FK PACKAGE

(TOP VIEW)

CC

NC – No internal connection

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

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SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

 

 

SCAS291I – MARCH 1993 – REVISED OCTOBER 1998

2

POST OFFICE BOX 655303 

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FUNCTION TABLE

ENABLE INPUTS

SELECT INPUTS

OUTPUTS

G1

G2A

G2B

C

B

A

Y0

Y1

Y2

Y3

Y4

Y5

Y6

Y7

X

H

X

X

X

X

H

H

H

H

H

H

H

H

X

X

H

X

X

X

H

H

H

H

H

H

H

H

L

X

X

X

X

X

H

H

H

H

H

H

H

H

H

L

L

L

L

L

L

H

H

H

H

H

H

H

H

L

L

L

L

H

H

L

H

H

H

H

H

H

H

L

L

L

H

L

H

H

L

H

H

H

H

H

H

L

L

L

H

H

H

H

H

L

H

H

H

H

H

L

L

H

L

L

H

H

H

H

L

H

H

H

H

L

L

H

L

H

H

H

H

H

H

L

H

H

H

L

L

H

H

L

H

H

H

H

H

H

L

H

H

L

L

H

H

H

H

H

H

H

H

H

H

L

logic symbols (alternatives)

BIN/OCT

1

1

A

2

2

B

4

3

C

4

5

6

G1

Y0

15

0

&

EN

Y1

14

1

Y2

13

2

Y3

12

3

Y4

11

4

Y5

10

5

Y6

9

6

Y7

7

7

DMUX

0

1

A

2

B

2

3

C

4

5

6

G1

Y0

15

0

&

Y1

14

1

Y2

13

2

Y3

12

3

Y4

11

4

Y5

10

5

Y6

9

6

Y7

7

7

G

7

0

G2A

G2B

G2A

G2B

† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, DB, J, PW, and W packages.

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SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

 

 

SCAS291I – MARCH 1993 – REVISED OCTOBER 1998

3

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logic diagram (positive logic)

G2B

G2A

G1

C

B

A

Y7

Y6

Y5

Y4

Y3

Y2

Y1

Y0

Data

Outputs

Select

Inputs

Enable

Inputs

1

2

3

6

4

5

15

14

13

12

11

10

9

7

Pin numbers shown are for the D, DB, J, PW, and W packages.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Supply voltage range, V

CC

 

–0.5 V to 6.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Input voltage range, V

I

 (see Note 1) 

–0.5 V to 6.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Output voltage range, V

O

 (see Notes 1 and 2) 

–0.5 V to V

CC

 + 0.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Input clamp current, I

IK

 (V

I

 < 0) 

–50 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Output clamp current, I

OK

 (V

O

 < 0) 

–50 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Continuous output current, I

O

 

±

50 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Continuous current through V

CC

 or GND 

±

100 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Package thermal impedance, 

θ

JA 

(see Note 3): D package 

113

°

C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

DB package 

131

°

C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

PW package 

149

°

C/W

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Storage temperature range, T

stg

 –65

°

C to 150

°

C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:

1. The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed.

2. The value of VCC is provided in the recommended operating conditions table.

3. The package thermal impedance is calculated in accordance with JESD 51.

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SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

 

 

SCAS291I – MARCH 1993 – REVISED OCTOBER 1998

4

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recommended operating conditions (see Note 4)

SN54LVC138A

SN74LVC138A

UNIT

MIN

MAX

MIN

MAX

UNIT

VCC

Supply voltage

Operating

2

3.6

1.65

3.6

V

VCC

Supply voltage

Data retention only

1.5

1.5

V

VCC = 1.65 V to 1.95 V

0.65 

×

VCC

VIH

High-level input voltage

VCC = 2.3 V to 2.7 V

1.7

V

VCC = 2.7 V to 3.6 V

2

2

VCC = 1.65 V to 1.95 V

0.35 

×

VCC

VIL

Low-level input voltage

VCC = 2.3 V to 2.7 V

0.7

V

VCC = 2.7 V to 3.6 V

0.8

0.8

VI

Input voltage

0

5.5

0

5.5

V

VO

Output voltage

0

VCC

0

VCC

V

VCC = 1.65 V

–4

IOH

High level output current

VCC = 2.3 V

–8

mA

IOH

High-level output current

VCC = 2.7 V

–12

–12

mA

VCC = 3 V

–24

–24

VCC = 1.65 V

4

IOL

Low level output current

VCC = 2.3 V

8

mA

IOL

Low-level output current

VCC = 2.7 V

12

12

mA

VCC = 3 V

24

24

t/

v

Input transition rise or fall rate

0

10

0

10

ns/V

TA

Operating free-air temperature

–55

125

–40

85

°

C

NOTE 4: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs, literature number SCBA004.

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SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

 

 

SCAS291I – MARCH 1993 – REVISED OCTOBER 1998

5

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electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

V

SN54LVC138A

SN74LVC138A

UNIT

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP†

MAX

MIN

TYP†

MAX

UNIT

IOH = 100

µ

A

1.65 V to 3.6 V

VCC–0.2

IOH = –100 

µ

A

2.7 V to 3.6 V

VCC–0.2

IOH = –4 mA

1.65 V

1.2

VOH

IOH = –8 mA

2.3 V

1.7

V

IOH = 12 mA

2.7 V

2.2

2.2

IOH = –12 mA

3 V

2.4

2.4

IOH = –24 mA

3 V

2.2

2.2

IOL = 100

µ

A

1.65 V to 3.6 V

0.2

IOL = 100 

µ

A

2.7 V to 3.6 V

0.2

VOL

IOL = 4 mA

1.65 V

0.45

V

VOL

IOL = 8 mA

2.3 V

0.7

V

IOL = 12 mA

2.7 V

0.4

0.4

IOL = 24 mA

3 V

0.55

0.55

II

VI = 5.5 V or GND

3.6 V

±

5

±

5

µ

A

ICC

VI = VCC or GND,

IO = 0

3.6 V

10

10

µ

A

ICC

One input at VCC – 0.6 V,

Other inputs at VCC or GND

2.7 V to 3.6 V

500

500

µ

A

Ci

VI = VCC or GND

3.3 V

5

5

pF

† All typical values are at VCC = 3.3 V, TA = 25

°

C.

switching characteristics over recommended operating free-air temperature range (unless

otherwise noted) (see Figure 3)

SN54LVC138A

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 2.7 V

VCC = 3.3 V

±

 0.3 V

UNIT

MIN

MAX

MIN

MAX

A or B or C

7.9

1

6.7

tpd

G2A or G2B

Y

7.4

1

6.5

ns

G1

6.4

1

5.8

switching characteristics over recommended operating free-air temperature range (unless

otherwise noted) (see Figures 1 through 3)

SN74LVC138A

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 1.8 V

VCC = 2.5 V

±

 0.2 V

VCC = 2.7 V

VCC = 3.3 V

±

 0.3 V

UNIT

TYP

MIN

MAX

MIN

MAX

MIN

MAX

A or B or C

15.9

1

9.9

7.9

1

6.7

tpd

G2A or G2B

Y

15.4

1

9.4

7.4

1

6.5

ns

G1

14.4

1

8.4

6.4

1

5.8

tsk(o)‡

1

ns

‡ Skew between any two outputs of the same package switching in the same direction

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SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

 

 

SCAS291I – MARCH 1993 – REVISED OCTOBER 1998

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operating characteristics, T

= 25

°

C

PARAMETER

TEST

VCC = 1.8 V VCC = 2.5 V VCC = 3.3 V

UNIT

PARAMETER

CONDITIONS

TYP

TYP

TYP

UNIT

Cpd

Power dissipation capacitance

f = 10 MHz

25

26

27

pF

PARAMETER MEASUREMENT INFORMATION

V

CC

 = 1.8 V 

±

 0.15 V

VCC/2

VCC/2

VCC/2

VCC/2

VCC/2

VCC/2

VCC/2

VCC/2

VOH

VOL

th

tsu

From Output

Under Test

CL = 30 pF

(see Note A)

LOAD CIRCUIT

S1

Open

GND

1 k

1 k

Output

Control

(low-level

enabling)

Output

Waveform 1

S1 at 2 

×

 VCC

(see Note B)

Output

Waveform 2

S1 at Open

(see Note B)

tPZL

tPZH

tPLZ

tPHZ

0 V

VOL + 0.15 V

VOH – 0.15 V

0 V

VCC

0 V

0 V

tw

VCC

VCC

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

VOLTAGE WAVEFORMS

PULSE DURATION

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

Timing

Input

Data

Input

Input

tpd

tPLZ/tPZL

tPHZ/tPZH

Open

×

 VCC

Open

TEST

S1

NOTES: A. CL includes probe and jig capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. All input pulses are supplied by generators having the following characteristics: PRR 

10 MHz, ZO = 50 

, tr 

2 ns, tf 

2 ns.

D. The outputs are measured one at a time with one transition per measurement.

E. tPLZ and tPHZ are the same as tdis.

F. tPZL and tPZH are the same as ten.

G. tPLH and tPHL are the same as tpd.

0 V

VCC

VCC/2

tPHL

VCC/2

VCC/2

VCC

0 V

VOH

VOL

Input

Output

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

VCC/2

VCC/2

tPLH

×

 VCC

VCC

Figure 1. Load Circuit and Voltage Waveforms

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SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

 

 

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PARAMETER MEASUREMENT INFORMATION

V

CC

 = 2.5 V 

±

 0.2 V

VCC/2

VCC/2

VCC/2

VCC/2

VCC/2

VCC/2

VCC/2

VCC/2

VOH

VOL

th

tsu

From Output

Under Test

CL = 30 pF

(see Note A)

LOAD CIRCUIT

S1

Open

GND

500

 Ω

500

 Ω

Output

Control

(low-level

enabling)

Output

Waveform 1

S1 at 2 

×

 VCC

(see Note B)

Output

Waveform 2

S1 at GND

(see Note B)

tPZL

tPZH

tPLZ

tPHZ

0 V

VOL + 0.15 V

VOH – 0.15 V

0 V

VCC

0 V

0 V

tw

VCC

VCC

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

VOLTAGE WAVEFORMS

PULSE DURATION

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

Timing

Input

Data

Input

Input

tpd

tPLZ/tPZL

tPHZ/tPZH

Open

×

 VCC

GND

TEST

S1

NOTES: A. CL includes probe and jig capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. All input pulses are supplied by generators having the following characteristics: PRR 

10 MHz, ZO = 50 

, tr 

2 ns, tf 

2 ns.

D. The outputs are measured one at a time with one transition per measurement.

E. tPLZ and tPHZ are the same as tdis.

F. tPZL and tPZH are the same as ten.

G. tPLH and tPHL are the same as tpd.

0 V

VCC

VCC/2

tPHL

VCC/2

VCC/2

VCC

0 V

VOH

VOL

Input

Output

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

VCC/2

VCC/2

tPLH

×

 VCC

VCC

Figure 2. Load Circuit and Voltage Waveforms

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SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

 

 

SCAS291I – MARCH 1993 – REVISED OCTOBER 1998

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PARAMETER MEASUREMENT INFORMATION

V

CC

 = 2.7 V AND 3.3 V 

±

 0.3 V

VOH

VOL

th

tsu

From Output

Under Test

CL = 50 pF

(see Note A)

LOAD CIRCUIT

S1

6 V

Open

GND

500

 Ω

500

 Ω

tPLH

tPHL

Output

Control

(low-level

enabling)

Output

Waveform 1

S1 at 6 V

(see Note B)

Output

Waveform 2

S1 at GND

(see Note B)

tPZL

tPZH

tPLZ

tPHZ

1.5 V

1.5 V

1.5 V

1.5 V

2.7 V

0 V

1.5 V

1.5 V

VOH

VOL

0 V

1.5 V

VOL + 0.3 V

1.5 V

VOH – 0.3 V

0 V

1.5 V

2.7 V

0 V

1.5 V

1.5 V

0 V

2.7 V

0 V

1.5 V

1.5 V

tw

Input

2.7 V

2.7 V

3 V

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

VOLTAGE WAVEFORMS

PULSE DURATION

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

Timing

Input

Data

Input

Output

Input

tpd

tPLZ/tPZL

tPHZ/tPZH

Open

6 V

GND

TEST

S1

NOTES: A. CL includes probe and jig capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. All input pulses are supplied by generators having the following characteristics: PRR 

10 MHz, ZO = 50 

, tr 

2.5 ns, tf 

2.5 ns.

D. The outputs are measured one at a time with one transition per measurement.

E. tPLZ and tPHZ are the same as tdis.

F. tPZL and tPZH are the same as ten.

G. tPLH and tPHL are the same as tpd.

Figure 3. Load Circuit and Voltage Waveforms

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IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF

DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR

WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER

CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO

BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

intellectual property right of TI covering or relating to any combination, machine, or process in which such

semiconductor products or services might be or are used. TI’s publication of information regarding any third

party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

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 1998, Texas Instruments Incorporated