NSC DM74LS353M Dual 4-input multiplexer with tri-state-r output Datasheet

DM74LS353
Dual 4-Input Multiplexer with TRI-STATEÉ Outputs
General Description
Features
The ’353 is a dual 4-input multiplexer with TRI-STATE outputs. It can select two bits of data from four sources using
common select inputs. The outputs may be individually
switched to a high impedance state with a HIGH on the
respective Output (OE) inputs, allowing the outputs to interface directly with bus oriented systems. It is fabricated with
the Schottky barrier diode process for high speed and is
completely compatible with all National TTL families.
Y
Connection Diagram
Logic Symbol
Y
Y
Inverted version of ’LS253
Schottky process for high speed
Multifunction capability
Dual-In-Line Package
TL/F/10185 – 2
VCC e Pin 16
GND e Pin 8
TL/F/10185 – 1
Order Number DM74LS353M or DM74LS353N
See NS Package Number M16A or N16E
Pin Names
I0a–I3a
I0b–I3b
S0, S1
OEa
OEb
Za, Zb
Description
Side A Data Inputs
Side B Data Inputs
Common Select Inputs
Side A Output Enable Input (Active Low)
Side B Output Enable Input (Active Low)
TRI-STATE Outputs (Inverted)
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C1995 National Semiconductor Corporation
TL/F/10185
RRD-B30M105/Printed in U. S. A.
DM74LS353 Dual 4-Input Multiplexer with TRI-STATE Outputs
February 1992
Absolute Maximum Ratings (Note)
Supply Voltage
Note: 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’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation .
7V
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
0§ C to a 70§ C
b 65§ C to a 150§ C
Recommended Operating Conditions
Symbol
Parameter
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
IOH
High Level Output Current
IOL
Low Level Output Current
TA
Free Air Operating Temperature
Min
Nom
Max
4.75
5
5.25
Units
V
2
V
0.8
V
b 2.6
mA
24
mA
70
§C
0
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 1)
Max
Units
b 1.5
V
VI
Input Clamp Voltage
VCC e Min, II e b18 mA
VOH
High Level Output
Voltage
VCC e Min, IOH e Max,
VIL e Max
VOL
Low Level Output
Voltage
VCC e Min, IOL e Max,
VIH e Min
0.5
IOL e 4 mA, VCC e Min
0.4
0.1
2.7
V
V
II
Input Current @ Max
Input Voltage
VCC e Max, VI e 7V
IIH
High Level Input Current
VCC e Max, VI e 2.7V
20
mA
IIL
Low Level Input Current
VCC e Max, VI e 0.4V
b 0.4
mA
IOS
Short Circuit Output Current
VCC e Max (Note 2)
b 130
mA
ICCL
Supply Current
Outputs HIGH
VCC e Max,
In, Sn, OEn e GND
12
mA
ICCZ
Supply Current
Outputs OFF
VCC e Max, OEn e 4.5V
In, Sn e GND
14
mA
IOZH
TRI–STATE Output OFF
Current HIGH
VCC e VCCH
VOZH e 2.7V
20
mA
IOZL
TRI–STATE Output OFF
Current LOW
VCC e VCCH
VOZL e 0.4V
b 20
mA
b 30
Note 1: All typicals are at VCC e 5V, TA e 25§ C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
2
mA
Switching Characteristics
VCC e a 5.0V, TA e a 25§ C
Symbol
RL e 2 kX, CL e 50 pF
Parameter
Min
Units
Max
tPLH
tPHL
Propagation Delay
Sn to Zn
24
32
ns
tPLH
tPHL
Propagation Delay
In to Zn
15
15
ns
tPZH
tPZL
Output Enable Time
OE to Zn
18
18
ns
tPHZ
tPLZ
Output Disable Time
OE to Zn
18
18
ns
Functional Description
If the outputs of TRI-STATE devices are tied together, all
but one device must be in the high impedance state to avoid
high currents that would exceed the maximum ratings. Designers should ensure that Output Enable signals to TRISTATE devices whose outputs are tied together are designed so that there is no overlap.
The ’LS353 contains two identical 4-input multiplexers with
TRI-STATE outputs. They select two bits from four sources
selected by common Select inputs (S0, S1). The 4-input
multiplexers have individual Output Enable (OEa), OEb) inputs which when HIGH, force the outputs to a high impedance (high Z) state. The logic equations for the outputs are
shown below:
Za e OEa # (I0a # S1 # S0 a I1a # S1 # S0 a I2a # S1 # S0 a I3a # S1 # S0)
Zb e OEb # (I0b # S1 # S0 a I1b # S1 # S0 a I2b # S1 # S0 a I3b # S1 # S0)
Truth Table
Select
Inputs
Output
Enable
Data Inputs
Output
S0
S1
I0
I1
I2
I3
OE
Z
X
L
L
H
X
L
L
L
X
L
H
X
X
X
X
L
X
X
X
X
X
X
X
X
H
L
L
L
(Z)
H
L
H
H
L
L
H
H
L
H
H
H
H
X
X
X
X
X
H
X
X
X
X
X
L
H
X
X
X
X
X
L
H
L
L
L
L
L
L
H
L
H
L
Address inputs S0 and S1 are common to both sections.
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
(Z) e High Impedance
3
Logic Diagram
TL/F/10185 – 3
4
Physical Dimensions inches (millimeters)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS353M
NS Package Number M16A
5
DM74LS353 Dual 4-Input Multiplexer with TRI-STATE Outputs
Physical Dimensions inches (millimeters) (Continued)
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS353N
NS Package Number N16E
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