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DM74LS158N

Part # DM74LS158N
Description Encoders, Decoders, Multiplexers & Demultiplexers Qd 2to1
Category IC
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

© 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 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
CC
= 5V, T
A
= 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 4.5V applied to all inputs and all outputs OPEN.
DM74LS157 Switching Characteristics
at V
CC
= 5V and T
A
= 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 V
CC
= Min, I
I
= 18 mA 1.5 V
V
OH
HIGH Level Output Voltage V
CC
= Min, I
OH
= Max, V
IL
= Max, V
IH
= Min 2.7 3.4 V
V
OL
LOW Level V
CC
= Min, I
OL
= Max, V
IL
= Max, V
IH
= Min 0.35 0.5
V
Output Voltage I
OL
= 4 mA, V
CC
= Min 0.25 0.4
I
I
Input Current @ Max V
CC
= Max S or G 0.2
mA
Input Voltage V
I
= 7V A or B 0.1
I
IH
HIGH Level V
CC
= Max S or G 40
µA
Input Current V
I
= 2.7V A or B 20
I
IL
LOW Level V
CC
= Max S or G 0.8
mA
Input Current V
I
= 0.4V A or B 0.4
I
OS
Short Circuit Output Current V
CC
= Max (Note 3) 20 100 mA
I
CC
Supply Current V
CC
= Max (Note 4) 9.7 16 mA
From (Input)
R
L
= 2 k
Symbol Parameter
To (Output)
C
L
= 15 pF C
L
= 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
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