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
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 A max
Low Quiescent Supply Current: I
CC
(static) = 4 A max (Ta = 25C)
Function Table
Outputs
Output Control
Clock
Data
HD74HC564
HD74HD574
L
H
L
H
L
L
H
L
L
L
X
Q
0
Q
0
H
X
X
Z
Z
Q
0
:
level of Q before the indicated Steady-sate input conditions were established.
Q
0
:
complement of Q
0
or level of
Q
before the indicated Steady-state input Conditions were established.
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