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SN74LVC74APWRE4 Datasheet(PDF) 2 Page - Texas Instruments

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No. de pieza SN74LVC74APWRE4
Descripción Electrónicos  DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS WITH CLEAR AND PRESET
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Fabricante Electrónico  TI [Texas Instruments]
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SN74LVC74APWRE4 Datasheet(HTML) 2 Page - Texas Instruments

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
TG
C
C
TG
C
C
TG
C
C
C
TG
C
C
PRE
CLK
D
CLR
Q
Q
C
SN54LVC74A, SN74LVC74A
DUAL POSITIVE-EDGE-TRIGGERED D-TYPE FLIP-FLOPS
WITH CLEAR AND PRESET
SCAS287S – JANUARY 1993 – REVISED MAY 2005
A low level at the preset (PRE) or clear (CLR) inputs sets or resets the outputs, regardless of the levels of the
other inputs. When PRE and CLR are inactive (high), data at the data (D) input meeting the setup time
requirements is transferred to the outputs on the positive-going edge of the clock pulse. Clock triggering occurs
at a voltage level and is not directly related to the rise time of the clock pulse. Following the hold-time interval,
data at the D input can be changed without affecting the levels at the outputs.
The data I/Os and control inputs are overvoltage tolerant. This feature allows the use of these devices for
down-translation in a mixed-voltage environment.
FUNCTION TABLE
INPUTS
OUTPUTS
PRE
CLR
CLK
D
Q
Q
L
H
X
X
H
L
H
L
X
X
L
H
L
L
X
X
H(1)
H(1)
H
H
H
H
L
H
H
L
L
H
H
H
L
X
Q0
Q 0
(1)
This configuration is nonstable; that is, it does not persist when
PRE or CLR returns to its inactive (high) level.
LOGIC DIAGRAM, EACH FLIP-FLOP
(POSITIVE LOGIC)
2


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