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74F350 датащи(PDF) 2 Page - Fairchild Semiconductor

номер детали 74F350
подробное описание детали  4-Bit Shifter with 3-STATE Outputs
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74F350 датащи(HTML) 2 Page - Fairchild Semiconductor

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Unit Loading/Fan Out
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 In inputs and is
shifted according to the code applied to the select inputs
S0, S1. Outputs O0–O3 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
O0 = S0S1I0 + S0S1I−1 + S0S1I−2 + S0S1I−3
O1 = S0S1I1 + S0S1I0 + S0S1I−1 + S0S1I−2
O2 = S0S1I2 + S0S1I1 + S0S1I0 + S0S1I−1
O3 = S0S1I3 + S0S1I2 + S0S1I1 + S0S1I0
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.
Pin Names
Description
U.L.
Input IIH/IIL
HIGH/LOW
Output IOH/IOL
S0, S1
Select Inputs
1.0/2.0
20
µA/−1.2 mA
I−3–I3
Data Inputs
1.0/2.0
20
µA/−1.2 mA
OE
Output Enable Input (Active LOW)
1.0/2.0
20
µA/−1.2 mA
O0–O3
3-STATE Outputs
150/40 (33.3)
−3 mA/24 mA (20 mA)


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