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SN74ABT574ARGYR データシート(PDF) 2 Page - Texas Instruments

部品番号 SN74ABT574ARGYR
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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SN74ABT574ARGYR データシート(HTML) 2 Page - Texas Instruments

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SN54ABT574, SN74ABT574A
OCTAL EDGETRIGGERED DTYPE FLIPFLOPS
WITH 3STATE OUTPUTS
SCBS191F − JANUARY 1991 − REVISED SEPTEMBER 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The eight flip-flops of the SN54ABT574 and SN74ABT574A are edge-triggered D-type flip-flops. 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 the high-impedance state. In the high-impedance state, the outputs neither load nor drive
the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus
lines without need for interface or pullup components.
OE does not affect the internal operations of the flip-flops. 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.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
terminal assignments
1234
A
1D
OE
VCC
1Q
B
3D
3Q
2D
2Q
C
5D
4D
5Q
4Q
D
7D
7Q
6D
6Q
E
GND
8D
CLK
8Q
FUNCTION TABLE
(each flip-flop)
INPUTS
OUTPUT
OE
CLK
D
OUTPUT
Q
L
H
H
L
LL
L
H or L
X
Q0
H
X
X
Z
logic diagram (positive logic)
OE
CLK
1D
1Q
To Seven Other Channels
C1
1
11
2
19
1D
Pin numbers shown are for the DB, DW, FK, J, N, NS, PW, RGY, and W packages.
SN74ABT574A . . . GQN OR ZQN PACKAGE
(TOP VIEW)
1
234
A
B
C
D
E


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