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HD74HC574 Datasheet

  • HD74HC574

  • Octal D-type Flip-Flops (with 3-state outputs)

  • 11頁

  • HITACHI

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HD74HC564/HD74HC574
Octal D-type Flip-Flops (with 3-state outputs)
Description
These devices are positive edge triggered flip-flops. The difference between HD74HC564 and
HD74HC574 is only that the former has inverting outputs and the latter has noninvertering outputs.
Data at the D inputs, meeting the set-up and hold time requirements, are transferred to the Q or
Q
outputs
on positive going transitions of the clock (CK) input. when a high logic level is applied to the output cotrol
(OC) input, all outputs go to a high impedance state, regardless of what signals are present at the other
inputs and the state of the storage elements.
Features
鈥?/div>
鈥?/div>
鈥?/div>
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High Speed Operation: t
pd
(Clock to Output) = 13 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 碌A(chǔ) max
Low Quiescent Supply Current: I
CC
(static) = 4 碌A(chǔ) max (Ta = 25擄C)
Function Table
Outputs
Output Control
L
L
L
H
Q
0
:
Q
0
:
L
X
Clock
Data
H
L
X
X
HD74HC564
L
H
Q
0
Z
HD74HD574
H
L
Q
0
Z
level of Q before the indicated Steady-sate input conditions were established.
complement of Q
0
or level of
Q
before the indicated Steady-state input Conditions were established.

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