MC74F350D データシートの表示（PDF） - Motorola => Freescale
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MC74F350D Datasheet PDF : 5 Pages
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4-BIT SHIFTER
(With 3-State Outputs)
The MC54/74F350 is a specialized multiplexer that accepts a 4-bit word
and shifts it 0, 1, 2 or 3 places, as determined by two Select (S0, S1) inputs.
For expansion to longer words, three linking inputs are provided for lower-or-
der bits; thus two packages can shift an 8-bit word, four packages a 16-bit
word, etc. Shifting by more than three places is accomplished by paralleling
the 3-state outputs of different packages and using the Output Enable (OE)
inputs as a third Select level. With appropriate interconnections, the F350 can
perform zero-backfill, sign-extend or end-around (barrel) shift functions.
• Linking Inputs for Word Expansion
• 3-State Outputs for Extending Shift Range
FUNCTIONAL DESCRIPTION
The F350 is operationally equivalent to a 4-input multiplexer with the inputs
connected so that the select code causes successive one-bit shifts of the data
word. This internal connection makes it possible to perform shifts of 0, 1, 2 or
3 places on words of any length.
A 7-bit data word is introduced at the In inputs and is shifted according to
the code applied to the select inputs S0, S1. Outputs O0–O3 are 3-state, con-
trolled by an active-LOW output enable (OE). When OE is LOW, data outputs
will follow selected data inputs; when HIGH, the data outputs will be forced to
the high-impedance state. This feature allows shifters to be cascaded on the
same output lines or to a common bus. The shift function can be logical, with
zeros pulled in at either or both ends of the shifting field; arithmetic, where the
sign bit is repeated during a shift down; or end around, where the data word
forms a continuous loop.
LOGIC EQUATIONS
O0 = S0 S1 I0 + S0 S1 l–1 + S0 S1 I–2 + S0 S1 I–3
O1 = S0 S1 I1 + S0 S1 I0 + S0 S1 l–1 + S0 S1 I–2
O2 = S0 S1 I2 + S0 S1 I1 + S0 S1 I0 + S0 S1 I–1
O3 = S0 S1 I3 + S0 S1 I2 + S0 S1 I1 + S0 S1 I0
TRUTH TABLE
Inputs
Outputs
OE
S1
S0
O0
O1
O2
O3
H
X
X
Z
Z
Z
Z
L
L
L
I0
I1
I2
I3
L
L
H
I–1
I0
I1
I2
L
H
L
I–2
I–1
I0
I1
L
H
H
I–3
I–2
I–1
I0
H = HIGH Voltage Level
L = LOW Voltage Level
Z = High Impedance
X = Immaterial
CONNECTION DIAGRAM
VCC O0 O1 OE O2 O3 S0 S1
16 15 14 13 12 11 10 9
1234
I–3 I–2 I–1 I0
56
I1 I2
78
I3 GND
FAST AND LS TTL DATA
4-153
MC54/74F350
4-BIT SHIFTER
(With 3-State Outputs)
FAST™ SCHOTTKY TTL
16
1
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
MC54FXXXJ
MC74FXXXN
MC74FXXXD
Ceramic
Plastic
SOIC
LOGIC SYMBOL
13 9 10
OE S1 S0
I–3
1
15
O0
14
O1
12
O2
11
O3
I–2
2
I–1
3
I0
4
I1
5
I2
6
I3
7
VCC = PIN 16
GND = PIN 8
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