Name: DM74LS157N
SKU: DM74LS157N
Price: 0.42201 USD
Availability: InStock

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 data selection to the four out-

put gates. A separate strobe input is provided. A 4-bit word

is selected from one of two sources and is routed to the

four outputs. The DM74LS157 presents true data whereas

the DM74LS158 presents inverted data to minimize propa-

gation 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 available in Tape and Reel. Specify by appending the suffix letter “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 values beyond which

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 “Recommended Operating Conditions” table will define the conditions

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 V

= 5V, T

= 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

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

DM74LS157 Switching Characteristics

at V

= 5V and T

= 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

Supply Voltage 4.75 5 5.25 V

HIGH Level Input Voltage 2 V

LOW Level Input Voltage 0.8 V

HIGH Level Output Current −0.4 mA

LOW Level Output Current 8 mA

Free Air Operating Temperature 0 70 °C

Symbol Parameter Conditions Min

Typ

Max Units

(Note 2)

Input Clamp Voltage V

= Min, I

= −18 mA −1.5 V

HIGH Level Output Voltage V

= Min, I

= Max, V

= Min 2.7 3.4 V

LOW Level V

= Min, I

= Max, V

= Min 0.35 0.5

Output Voltage I

= 4 mA, V

= Min 0.25 0.4

Input Current @ Max V

= Max S or G 0.2

Input Voltage V

= 7V A or B 0.1

HIGH Level V

= Max S or G 40

µA

Input Current V

= 2.7V A or B 20

LOW Level V

= Max S or G −0.8

Input Current V

= 0.4V A or B −0.4

Short Circuit Output Current V

= Max (Note 3) −20 −100 mA

Supply Current V

= Max (Note 4) 9.7 16 mA

From (Input)

= 2 kΩ

Symbol Parameter

To (Output)

= 15 pF C

= 50 pF Units

MinMaxMinMax

PLH

Propagation Delay Time

Data to Y 14 18 ns

LOW-to-HIGH Level Output

PHL

Propagation Delay Time

Data to Y 14 23 ns

HIGH-to-LOW Level Output

PLH

Propagation Delay Time

Strobe to Y 20 24 ns

LOW-to-HIGH Level Output

PHL

Propagation Delay Time

Strobe to Y 21 30 ns

HIGH-to-LOW Level Output

PLH

Propagation Delay Time

Select to Y 23 28 ns

LOW-to-HIGH Level Output

PHL

Propagation Delay Time

Select to Y 27 32 ns

HIGH-to-LOW Level Output

Part #	DM74LS157N
Description	CRIMPER HOLDER-INSUL
Category	Microcircuit
Availability	In Stock
Qty	232

Qty	Price
1 - 48	$0.42201
49 - 97	$0.33761
98 - 146	$0.27853
147 - 194	$0.25883
195 +	$0.23070

Manufacturer	Available	Qty
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DM74LS157N

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