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74AC299PC Arkusz danych(PDF) 2 Page - Fairchild Semiconductor

Numer części 74AC299PC
Szczegółowy opis  8-Input Universal Shift/Storage Register
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74AC299PC Arkusz danych(HTML) 2 Page - Fairchild Semiconductor

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Logic Symbols
IEEE/IEC
Truth Table
H
HIGH Voltage Level
L
LOW Voltage Level
X
Immaterial
 LOW-to-HIGH Transition
Functional Description
The AC/ACT299 contains eight edge-triggered D-type flip-
flops and the interstage logic necessary to perform syn-
chronous shift left, shift right, parallel load and hold opera-
tions. The type of operation is determined by S0 and S1, as
shown in the Truth Table. All flip-flop outputs are brought
out through 3-STATE buffers to separate I/O pins that also
serve as data inputs in the parallel load mode. Q0 and Q7
are also brought out on other pins for expansion in serial
shifting of longer words.
A LOW signal on MR overrides the Select and CP inputs
and resets the flip-flops. All other state changes are initi-
ated by the rising edge of the clock. Inputs can change
when the clock is in either state provided only that the rec-
ommended setup and hold times, relative to the rising edge
of CP, are observed.
A HIGH signal on either OE1 or OE2 disables the 3-STATE
buffers and puts the I/O pins in the high impedance state.
In this condition the shift, hold, load and reset operations
can still occur. The 3-STATE buffers are also disabled by
HIGH signals on both S0 and S1 in preparation for a paral-
lel load operation.
Inputs
Response
MR
S1
S0 CP
L
X
X
X
Asynchronous Reset; Q0–Q7 LOW
HH
H
 Parallel Load; I/On o Qn
HL
H
 Shift Right; DS0 o Q0, Q0 o Q1, etc.
HH
L
 Shift Left, DS7 o Q7, Q7 o Q6, etc.
H
L
L
X
Hold


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