MC74F352D データシートの表示（PDF） - Motorola => Freescale
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MC74F352D Datasheet PDF : 3 Pages
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MC54/74F352
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
TA
Supply Voltage
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
Min
Typ
Max
Unit
54, 74
4.5
5.0
5.5
V
54
- 55
25
125
°C
74
0
25
70
54, 74
–1.0
mA
54, 74
20
mA
FUNCTIONAL DESCRIPTION
The F352 is a dual 4-input multiplexer. It selects two bits of
data from up to four sources under the control of the common
Select inputs (S0, S1).The two 4-input multiplexer circuits
have individual active-LOW Enables(Ea, Eb) which can be
used to strobe the outputs independently. When the Enables
(Ea, Eb) are HIGH, the corresponding outputs (Za, Zb) are
forced HIGH.
The logic equations for the outputs are shown below:
The F352 can be used to move data from a group of regis-
ters to a common output bus. The particular register from
which the data came would be determined by the state of the
Select inputs. A less obvious application is as a function gen-
erator. The F352 can generate two functions of three vari-
ables. This is useful for implementing highly irregular random
logic.
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)
FUNCTION TABLE
Select
Inputs
Inputs (a or b)
S0 S1 E I0
X XHX
I1 I2 I3
XXX
L LLL
XXX
L
L LH
XXX
H L LX
L XX
H L LX
HXX
L HLX
XLX
L HLX
XHX
H HLX
XXL
H HLX
X XH
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Output
Z
H
H
L
H
L
H
L
H
L
FAST AND LS TTL DATA
4-158
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