MC54/74F353
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 directly with bus-oriented systems.
DUAL 4-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
• Inverted Version of F253
• Multifunction Capability
• Separate Enables for Each Multiplexer
J SUFFIX
CERAMIC
CASE 620-09
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 (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=OEa • (I0a • S1 • S0 +I1a • S1 • S0 + I2a • S1 • S0 + I3a • S1 • S0)
Zb=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.
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
16
1
ORDERING INFORMATION
MC54FXXXJ
MC74FXXXN
MC74FXXXD
CONNECTION DIAGRAM (TOP VIEW)
VCC
OEb
S0
I3b
I2b
I1b
I0b
Zb
16
15
14
13
12
11
10
Ceramic
Plastic
SOIC
9
LOGIC SYMBOL
2
S1
1
2
3
4
5
6
7
8
OEa
S1
I3a
I2a
I1a
I0a
Za
GND
7
9
VCC = PIN 16
GND = PIN 8
FAST AND LS TTL DATA
4-160
Za
Zb
14
S0
OEa
I0a
I1a
I2a
I3a
I0b
I1b
I2b
I3b
OEb
1
6
5
4
3
10
11
12
13
15
