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54F158ADM Datasheet(Hoja de datos) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de Pieza. 54F158ADM
Descripción  Quad 2-Input Multiplexer
Descarga  8 Pages
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Fabricante  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
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 2 page
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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
I0a–I0d
Source 0 Data Inputs
1010
20 mA b06 mA
I1a–I1d
Source 1 Data Inputs
1010
20 mA b06 mA
E
Enable Input (Active LOW)
1010
20 mA b06 mA
S
Select Input
1010
20 mA b06 mA
Za–Zd
Inverted Outputs
50333
b
1 mA20 mA
Functional Description
The ’F158A quad 2-input multiplexer selects four bits of
data from two sources under the control of a common Se-
lect input (S) and presents the data in inverted form at the
four outputs The Enable input (E) is active LOW When E is
HIGH all of the outputs (Z) are forced HIGH regardless of
all other inputs The ’F158A is the logic implementation of a
4-pole 2-position switch where the position of the switch is
determined by the logic levels supplied to the Select input
A common use of the ’F158A is the moving of data from two
groups of registers to four common output busses The par-
ticular register from which the data comes is determined by
the state of the Select input A less obvious use is as a
function generator The ’F158A can generate four functions
of two variables with one variable common This is useful for
implementing gating functions
Truth Table
Inputs
Outputs
E
SI0
I1
Z
HX
X
X
H
LL
L
X
H
LL
H
X
L
LH
X
L
H
LH
X
H
L
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Zn e E c (I1n S a I0n S)
Logic Diagram
TLF9484 – 4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2




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