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SN74LV374ADWR データシート(PDF) 2 Page - Texas Instruments

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部品番号 SN74LV374ADWR
部品情報  OCTAL EDGE TRIGGERED D TYPE FLIP FLOPS WITH 3 STATE OUTPUTS
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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SN74LV374ADWR データシート(HTML) 2 Page - Texas Instruments

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SN54LV374A, SN74LV374A
OCTAL EDGETRIGGERED DTYPE FLIPFLOPS
WITH 3STATE OUTPUTS
SCLS408G − APRIL 1998 − REVISED DECEMBER 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
These devices feature 3-state outputs designed specifically for driving highly capacitive or relatively
low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional
bus drivers, and working registers.
On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels set up at the data (D)
inputs.
A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high
or low logic levels) or high-impedance state. In the high-impedance state, the outputs neither load nor drive the
bus lines significantly. The high-impedance state and the increased drive provide the capability to drive bus lines
without need for interface or pullup components.
OE does not affect internal operations of the latch. Old data can be retained or new data can be entered while
the outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the
outputs, preventing damaging current backflow through the devices when they are powered down.
terminal assignments
1234
A
1Q
OE
VCC
8Q
B
2D
7D
1D
8D
C
3Q
2Q
6Q
7Q
D
4D
5D
3D
6D
E
GND
4Q
CLK
5Q
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
OE
CLK
D
OUTPUT
Q
L
H
H
L
LL
L
LX
Q0
H
X
X
Z
GQN PACKAGE
(TOP VIEW)
1
234
A
B
C
D
E


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