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74F194 Folha de dados(PDF) 2 Page - Fairchild Semiconductor

Nome de Peças 74F194
Descrição Electrónicos  4-Bit Bidirectional Universal Shift Register
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74F194 Folha de dados(HTML) 2 Page - Fairchild Semiconductor

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Unit Loading/Fan Out
Functional Description
The 74F194 contains four edge-triggered D-type flip-flops
and the necessary interstage logic to synchronously per-
form shift right, shift left, parallel load and hold operations.
Signals applied to the Select (S0, S1) inputs determine the
type of operation, as shown in the Mode Select Table. Sig-
nals on the Select, Parallel data (P0–P3) and Serial data
(DSR, DSL) inputs can change when the clock is in either
state, provided only that the recommended setup and hold
times, with respect to the clock rising edge, are observed.
A LOW signal on Master Reset (MR) overrides all other
inputs and forces the outputs LOW.
Mode Select Table
H (h)
= HIGH Voltage Level
L (l)
= LOW Voltage Level
pn (qn) = Lower case letters indicate the state of the referenced input (or
output) one setup time prior to the LOW-to-HIGH clock transition.
X
= Immaterial
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
Mode Control Inputs
1.0/1.0
20
µA/−0.6 mA
P0–P3
Parallel Data Inputs
1.0/1.0
20
µA/−0.6 mA
DSR
Serial Data Input (Shift Right)
1.0/1.0
20
µA/−0.6 mA
DSL
Serial Data Input (Shift Left)
1.0/1.0
20
µA/−0.6 mA
CP
Clock Pulse Input (Active Rising Edge)
1.0/1.0
20
µA/−0.6 mA
MR
Asynchronous Master Reset Input (Active LOW)
1.0/1.0
20
µA/−0.6 mA
Q0–Q3
Parallel Outputs
50/33.3
−1 mA/20 mA
Operating
Inputs
Outputs
Mode
MR S1 S0 DSR DSL Pn Q0 Q1 Q2 Q3
Reset
L
X
X
X
X
X
L
L
L
L
Hold
H
l
l
X
X
X
q0 q1 q2 q3
Shift Left
H
h
l
X
l
X
q1 q2 q3 L
Hh
l
X
h
X
q1 q2 q3 H
Shift Right
H
l
h
l
X
X
L
q0 q1 q2
Hlh
h
X
X
H
q0 q1 q2
Parallel Load
H
h
h
X
X
pn p0 p1 p2 p3


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