Datasheet DM74LS157CW, DM74LS157SJ, DM74LS157N, DM74LS157MX, DM74LS157M Datasheet (Fairchild Semiconductor)

© 2000 Fairchild Semiconductor Corporation DS006396 www.fairchildsemi.com

September 1986
Revised April 2000

DM74LS157 • DM74LS158 Quad 2-Line to 1-Line Data Selectors/Multiplexers

DM74LS157 • DM74LS158
Quad 2-Line to 1-Line Data Selectors/Multiplexers

General Description

These data selectors/multiplexers contain inverters and
drivers to supply full on-chip da ta selection to the fo ur out­put gates. A separate strobe input is provided. A 4-bit word
is selected from one o f two sources and is route d to the
four outputs. The DM 74LS 157 p resent s true dat a where as
the DM74LS158 presents inverted data to minimize propa­gation delay time.

Applications

• Expand any data input point

• Multiplex dual data buses

• Generate four functions of two variables
(one variable is common)

• Source programmable counters

Features

■ Buffered inputs and outputs

■ Typical Propagation Time

DM74LS157 9 ns
DM74LS158 7 ns

■ Typical Power Dissipation

DM74LS157 49 mW
DM74LS158 24 mW

Ordering Code:

Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

Connection Diagrams

DM74LS157 DM74LS158

Order Number Package Number Package Description

DM74LS157M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS157N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74LS158M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS158N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

www.fairchildsemi.com 2

DM74LS157 • DM74LS158

Function Table

H = HIGH Level
L = LOW Level
X = Don’t Care

Logic Diagrams

DM74LS157 DM74LS158

Inputs Output Y

Strobe Select A B DM74LS157 DM74LS158

HXXXLH
LLLXLH
LLHXHL
LHXLLH
LHXHHL

3 www.fairchildsemi.com

DM74LS157 • DM74LS158

Absolute Maximum Ratings(Note 1)

Note 1: The “Absolute Maximum Ratings ” are those val ues beyond w hich

the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions” t able w ill defin e the condition s
for actual device operation.

DM74LS157 Recommended Operating Conditions

DM74LS157 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 4: I

CC

is measured with 4.5 V applied to all inputs and all outputs OPEN.

DM74LS157 Switching Characteristics

at VCC = 5V and TA = 25°C

Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C

Symbol Parameter Min Nom Max Units

V

CC

Supply Voltage 4.75 5 5.25 V

V

IH

HIGH Level Input Voltage 2 V

V

IL

LOW Level Input Voltage 0.8 V

I

OH

HIGH Level Output Current −0.4 mA

I

OL

LOW Level Output Current 8 mA

T

A

Free Air Operating Temperature 0 70 °C

Symbol Parameter Conditions Min

Typ

Max Units

(Note 2)

V

I

Input Clamp Voltage VCC = Min, II = −18 mA −1.5 V

V

OH

HIGH Level Output Voltage VCC = Min, IOH = Max, VIL = Max, VIH = Min 2.7 3.4 V

V

OL

LOW Level VCC = Min, IOL = Max, VIL = Max, VIH = Min 0.35 0.5

V

Output Voltage IOL = 4 mA, VCC = Min 0.25 0.4

I

I

Input Current @ Max VCC = Max S or G 0.2

mA

Input Voltage VI = 7V A or B 0.1

I

IH

HIGH Level VCC = Max S or G 40

µA

Input Current VI = 2.7V A or B 20

I

IL

LOW Level VCC = Max S or G −0.8

mA

Input Current VI = 0.4V A or B −0.4

I

OS

Short Circuit Output Current VCC = Max (Note 3) −20 −100 mA

I

CC

Supply Current VCC = Max (Note 4) 9.7 16 mA

From (Input)

RL = 2 kΩ

Symbol Parameter

To (Output)

CL = 15 pF CL = 50 pF Units

MinMaxMinMax

t

PLH

Propagation Delay Time

Data to Y 14 18 ns

LOW-to-HIGH Level Output

t

PHL

Propagation Delay Time

Data to Y 14 23 ns

HIGH-to-LOW Level Output

t

PLH

Propagation Delay Time

Strobe to Y 20 24 ns

LOW-to-HIGH Level Output

t

PHL

Propagation Delay Time

Strobe to Y 21 30 ns

HIGH-to-LOW Level Output

t

PLH

Propagation Delay Time

Select to Y 23 28 ns

LOW-to-HIGH Level Output

t

PHL

Propagation Delay Time

Select to Y 27 32 ns

HIGH-to-LOW Level Output

www.fairchildsemi.com 4

DM74LS157 • DM74LS158

DM74LS158 Recommended Operating Conditions

DM74LS158 Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted)

Note 5: All typicals are at VCC = 5V, TA = 25°C.
Note 6: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 7: I

CC

is measured with 4.5V applied to all inputs and all outputs OPEN.

DM74LS158 Switching Characteristics

at VCC = 5V and TA = 25°C

Symbol Parameter Min Nom Max Units

V

CC

Supply Voltage 4.75 5 5.25 V

V

IH

HIGH Level Input Voltage 2 V

V

IL

LOW Level Input Voltage 0.8 V

I

OH

HIGH Level Output Current −0.4 mA

I

OL

LOW Level Output Current 8 mA

T

A

Free Air Operating Temperature 0 70 °C

Symbol Parameter Conditions Min

Typ

Max Units

(Note 5)

V

I

Input Clamp Voltage VCC = Min, II = −18 mA −1.5 V

V

OH

HIGH Level VCC = Min, IOH = Max

2.7 3.4 V

Output Voltage VIL = Max, VIH = Min

V

OL

LOW Level VCC = Min, IOL = Max

0.35 0.5

Output Voltage VIL = Max, VIH = Min V

IOL = 4 mA, VCC = Min 0.25 0.4

I

I

Input Current @ Max VCC = Max S or G 0.2

mA

Input Voltage VI = 7V A or B 0.1

I

IH

HIGH Level VCC = Max S or G 40

µA

Input Current VI = 2.7V A or B 20

I

IL

LOW Level VCC = Max S or G −0.8

mA

Input Current VI = 0.4V A or B −0.4

I

OS

Short Circuit Output Current VCC = Max (Note 6) −20 −100 mA

I

CC

Supply Current VCC = Max (Note 7) 4.8 8 mA

From (Input)

RL = 2 kΩ

Symbol Parameter

To (Output)

CL = 15 pF CL = 50 pF Units

Min Max Min Max

t

PLH

Propagation Delay Time

Data to Y 12 18 ns

LOW-to-HIGH Level Output

t

PHL

Propagation Delay Time

Data to Y 12 21 ns

HIGH-to-LOW Level Output

t

PLH

Propagation Delay Time

Strobe to Y 17 23 ns

LOW-to-HIGH Level Output

t

PHL

Propagation Delay Time

Strobe to Y 18 28 ns

HIGH-to-LOW Level Output

t

PLH

Propagation Delay Time

Select to Y 20 24 ns

LOW-to-HIGH Level Output

t

PHL

Propagation Delay Time

Select to Y 24 36 ns

HIGH-to-LOW Level Output

5 www.fairchildsemi.com

DM74LS157 • DM74LS158

Physical Dimensions inches (millimeters) unless otherwise noted

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

Package Number M16A

www.fairchildsemi.com 6

DM74LS157 • DM74LS158

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Package Number M16D

7 www.fairchildsemi.com

DM74LS157 • DM74LS158 Quad 2-Line to 1-Line Data Selectors/Multiplexers

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Package Number N16E

Fairchild does not assume any responsibility for use of any circu itry described, no circuit patent license s are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are dev ic es or syste ms
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided i n the labe li ng, can be re a­sonably expected to result in a significant injury to the
user.

2. A critical componen t in any com ponent o f a l ife supp ort
device or system whose failu re to perform can b e rea­sonably expected to c ause th e fa i lure of the li fe s upp or t
device or system, or to affect its safety or effectiveness.

www.fairchildsemi.com