74F253PC Fairchild Semiconductor, 74F253PC Datasheet - Page 2

• Manufacturer Part Number: 74F253PC
• Description: IC MULTIPLEXER QUAD 2INP 16-DIP
• Manufacturer: Fairchild Semiconductor
• Series: 74Fr
• Type: Multiplexerr

Specifications of 74F253PC

• Circuit: 2 x 4:1
• Independent Circuits: 1
• Current - Output High, Low: 3mA, 24mA
• Voltage Supply Source: Single Supply
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 74F253

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Unit Loading/Fan Out
Functional Description
This device contains two identical 4-input multiplexers with
3-STATE outputs. They select two bits from four sources
selected by common Select inputs (S
multiplexers have individual Output Enable (OE
inputs which, when HIGH, force the outputs to a high
impedance (High Z) state. This device is the logic imple-
mentation of a 2-pole, 4-position switch, where the position
of the switch is determined by the logic levels supplied to
the two select inputs. The logic equations for the outputs
are shown below:
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.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Z
Z
a
b
I
I
S
OE
OE
Z
0a
0b
Pin Names
a
0
OE
OE
, Z
–I
–I
–S
a
b
I
I
3a
3b
2a
2b
b
1
a
b
• (I
• (I
• S
• S
0a
0b
1
1
• S
• S
• S
• S
0
0
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)
3-STATE Outputs
1
1
• S
• S
I
I
3a
3b
0
0
• S
• S
I
I
1a
1b
1
1
• S
• S
• S
• S
0
0
0
1
1
)
)
, S
Description
• S
• S
1
0
0
). The 4-input
a
, OE
b
)
2
Truth Table
Address inputs S
H
L
X
Z
LOW Voltage Level
High Impedance
S
HIGH Voltage Level
Immaterial
H
H
H
H
X
L
L
L
L
Select
Inputs
0
150/40(33.3)
HIGH/LOW
S
H
H
H
H
X
L
L
L
L
1
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
U.L.
0
and S
I
H
X
X
X
X
X
X
X
L
0
1
Data Inputs
are common to both sections.
H
I
X
X
X
X
X
X
X
L
1
3 mA/24 mA (20 mA)
I
X
X
X
X
X
H
X
X
L
2
Output I
20 A/ 0.6 mA
20 A/ 0.6 mA
20 A/ 0.6 mA
20 A/ 0.6 mA
20 A/ 0.6 mA
Input I
I
X
X
X
X
X
X
X
H
L
3
IH
OH
Output
Enable
/I
/I
IL
OE
OL
H
L
L
L
L
L
L
L
L
Output
H
H
H
H
Z
Z
L
L
L
L