74F350 4-Bit Shifter with 3-STATE Outputs
April 1988
Revised August 1999
74F350
4-Bit Shifter with 3-STATE Outputs
General Description
The 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 (S
0
, S
1
) inputs. For expansion to longer words, three
linking inputs are provided for lower-order bits; thus two
packages can shift an 8-bit word, four packages a 16-bit
word, etc. Shifting by more than three places is accom-
plished 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
74F350 can perform zero-backfill, sign-extend or end-
around (barrel) shift functions.
Features
s
Linking inputs for word expansion
s
3-STATE outputs for extending shift range
Ordering Code:
Order Number
74F350SC
74F350SJ
74F350PC
Package Number
M16A
M16D
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Truth Table
Inputs
OE
H
L
L
L
L
S
1
X
L
L
H
H
S
0
X
L
H
L
H
O
0
Z
I
0
I
−1
I
−2
I
−3
Outputs
O
1
Z
I
1
I
0
I
−1
I
−2
O
2
Z
I
2
I
1
I
0
I
−1
O
3
Z
I
3
I
2
I
1
I
0
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
© 1999 Fairchild Semiconductor Corporation
DS009518
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74F350
Unit Loading/Fan Out
Pin Names
S
0
, S
1
I
−3
–I
3
OE
O
0
–O
3
Description
Select Inputs
Data Inputs
Output Enable Input (Active LOW)
3-STATE Outputs
U.L.
HIGH/LOW
1.0/2.0
1.0/2.0
1.0/2.0
150/40 (33.3)
Input I
IH
/I
IL
Output I
OH
/I
OL
20
µA/−1.2
mA
20
µA/−1.2
mA
20
µA/−1.2
mA
−3
mA/24 mA (20 mA)
Functional Description
The 74F350 is operationally equivalent to a 4-input multi-
plexer 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 4-bit data word is introduced at the I
n
inputs and is
shifted according to the code applied to the select inputs
S
0
, S
1
. Outputs O
0
–O
3
are 3-STATE, controlled 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 dur-
ing a shift down; or end around, where the data word forms
a continuous loop.
Logic Equations
O
0
=
S
0
S
1
I
0
+
S
0
S
1
I
−1
+
S
0
S
1
I
−2
+
S
0
S
1
I
−3
O
1
=
S
0
S
1
I
1
+
S
0
S
1
I
0
+
S
0
S
1
I
−1
+
S
0
S
1
I
−2
O
2
=
S
0
S
1
I
2
+
S
0
S
1
I
1
+
S
0
S
1
I
0
+
S
0
S
1
I
−1
O
3
=
S
0
S
1
I
3
+
S
0
S
1
I
2
+
S
0
S
1
I
1
+
S
0
S
1
I
0
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.
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2
74F350
Applications
16-Bit Shift-Up 0 to 3 Places, Zero Backfill
Function Table
S
1
L
L
H
H
S
0
L
H
L
H
Shift Function
No Shift
Shift 1 Place
Shift 2 Places
Shift 3 Places
8-Bit End Around Shift 0 to 7 Places
Function Table
S
2
L
L
L
L
H
H
H
H
S
1
L
L
H
H
L
L
H
H
S
0
L
H
L
H
L
H
L
H
Shift Function
No Shift
Shift End Around 1
Shift End Around 2
Shift End Around 3
Shift End Around 4
Shift End Around 5
Shift End Around 6
Shift End Around 7
3
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74F350
13-Bit Twos Complement Scaler
Function Table
S
1
L
L
H
H
L÷8
H÷4
L÷2
H No Change
S
0
Scale
1
/
8
1
/
4
½
1
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4
74F350
Absolute Maximum Ratings
(Note 1)
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
V
CC
Pin Potential to Ground Pin
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Output
in HIGH State (with V
CC
=
0V)
Standard Output
3-STATE Output
Current Applied to Output
in LOW State (Max)
twice the rated I
OL
(mA)
−0.5V
to V
CC
−0.5V
to
+5.5V
−65°C
to
+150°C
−55°C
to
+125°C
−55°C
to
+150°C
−0.5V
to
+7.0V
−0.5V
to
+7.0V
−30
mA to
+5.0
mA
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to
+70°C
+4.5V
to
+5.5V
Note 1:
Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2:
Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
CD
V
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
10% V
CC
10% V
CC
5% V
CC
10% V
CC
V
OL
I
IH
I
BVI
I
CEX
V
ID
I
OD
I
IL
I
OZH
I
OZL
I
OS
I
ZZ
I
CCH
I
CCL
I
CCZ
Output LOW Voltage
Input HIGH Current
Input HIGH Current
Breakdown Test
Output HIGH
Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW Current
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Bus Drainage Test
Power Supply Current
Power Supply Current
Power Supply Current
34
40
40
−60
4.75
3.75
−1.2
50
−50
−150
500
42
57
57
10% V
CC
2.5
2.4
2.7
2.7
0.5
5.0
7.0
50
V
µA
µA
µA
V
µA
mA
µA
µA
mA
µA
mA
mA
mA
Min
Max
Max
Max
0.0
0.0
Max
Max
Max
Max
0.0V
Max
Max
Max
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
V
Min
Min
V
CC
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
I
IN
= −18
mA
I
OH
= −1
mA
I
OH
= −3
mA
I
OH
= −1
mA
I
OH
= −3
mA
I
OL
=
24 mA
V
IN
=
2.7V
V
IN
=
7.0V
V
OUT
=
V
CC
I
ID
=
1.9
µA
All Other Pins Grounded
V
IOD
=
150 mV
All Other Pins Grounded
V
IN
=
0.5V
V
OUT
=
2.7V
V
OUT
=
0.5V
V
OUT
=
0V
V
OUT
=
5.25V
V
O
=
HIGH
V
O
=
LOW
V
O
=
HIGH Z
5
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