Motorola MC74F353D, MC74F353N, MC54F353J Datasheet
4-160
FAST AND LS TTL DATA
DUAL 4-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
The MC54/74F353 is a dual 4-input multiplexer with 3-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 Enable (OE
) inputs, allowing the outputs to interface di-
rectly with bus-oriented systems.
• Inverted Version of F253
• Multifunction Capability
• Separate Enables for Each Multiplexer
FUNCTIONAL DESCRIPTION
The MC54/74F353 contains two identical 4-input multiplexers with 3-state
outputs. They select two bits from four sources selected by common Select
inputs (S0, S1).The 4-input multiplexers have individual Output enable (OE
a
,
OE
b
) inputs which, when HIGH, force the outputs to a high impedance (high
Z) state. The logic equations for the outputs are shown below:
Z
a
=OEa • (I0a • S1 • S0 +I1a • S1 • S0 + I2a • S1 • S0 + I3a • S1 • S0)
Z
b
=OEb• (I0b • S1 • S0 + I1b • S1 • S0 + I2b•S1•S0+I3b•S1•S0)
If the outputs of 3-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
3-state devices whose outputs are tied together are designed so that there is
no overlap.
CONNECTION DIAGRAM (TOP VIEW)
1516 14 13 12 11 10
21 3 4 5 6 7
V
CC
9
8
OE
bS0I3bI2bI1bI0bZb
OEaS1I3aI2aI1aI
0aZa
GND
DUAL 4-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
MC54/74F353
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
MC54FXXXJ Ceramic
MC74FXXXN Plastic
MC74FXXXD SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
2 14
1
6
5
4
3
10
11
12
13
15
9
7
Z
a
Z
b
S
1
S
0
OE
a
I
0a
I
1a
I
2a
I
3a
I
0b
I
1b
I
2b
I
3b
OE
b
VCC = PIN 16
GND = PIN 8
4-161
FAST AND LS TTL DATA
MC54/74F353
FUNCTION TABLE
Select
Inputs
Data Inputs
Output
Enable
Output
S
0
S
1
I
0I1I2
I
3
OE Z
X X X X X X H (Z)
L L L X X X L H
L L H X X X L L
H L X L X X L H
H L X H X X L L
L H X X L X L H
L H X X H X L L
H H X X X L L H
H H X X X H L L
Address inputs S0 and S1 are common to both sections.
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
(Z) = High Impedance
LOGIC DIAGRAM
OE
bI3bI2bI1bI0bS0S1I3aI2aI1aI0aOEa
Z
a
Z
b
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage 54, 74 4.5 5.0 5.5 V
T
A
Operating Ambient Temperature Range
54 –55 25 125
°C
A
74 0 25 70
I
OH
Output Current High 54, 74 –3.0 mA
I
OL
Output Current Low 54, 74 24 mA
Loading...