74VHC153(2007) データシートの表示（PDF） - Fairchild Semiconductor
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74VHC153 Datasheet PDF : 9 Pages
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Logic Symbols
IEEC/IEC
Functional Description
The VHC153 is a dual 4-input multiplexer. It can select two
bits of data from up to four sources under the control of the
common Select inputs (S0, S1). The two 4-input multi-
plexer circuits have individual active-LOW Enables (Ea,
Eb) which can be used to strobe the outputs indepen-
dently. When the Enables (Ea, Eb) are HIGH, the corre-
sponding outputs (Za, Zb) are forced LOW. The VHC153 is
the logic implementation of a 2-pole, 4-position switch,
where the position of the switch is determined by the logic
levels supplied to the Select inputs. The logic equations for
the outputs are shown below.
Za = Ea • (I0a • S1 • S0 + I1a • S1 • S0 + I2a • S1 • S0
+ I3a • S1 • S0)
Zb = Eb • (I0b • S1 • S0 + I1b • S1 • S0 + I2b • S1 • S0
+ I3b • S1 • S0)
Truth Table
Select
Inputs
S0 S1
XX
LL
LL
HL
Inputs (a or b)
E I0 I1 I2 I3
HXXXX
L LXXX
LHXXX
LXLXX
Output
Z
L
L
H
L
HL LXHXX
H
LHLXXLX
L
L H L XXHX
H
HHL XXX L
L
HHL XXXH
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
©1993 Fairchild Semiconductor Corporation
74VHC153 Rev. 1.2
2
www.fairchildsemi.com
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