TECHNICAL DATA
IN74HC574A
Octal 3-State
Noninverting D Flip-Flop
High-Performance Silicon-Gate CMOS
The IN74HC574A is identical in pinout to the LS/ALS574. The
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
Data meeting the setup time is clocked to the outputs with the
rising edge of the Clock. The Output Enable input does not affect the
states of the flip-flops, but when Output Enable is high, all device
outputs are forced to the high-impedance state; thus, data may be
stored even when the outputs are not enabled.
ORDERING INFORMATION
IN74HC574AN Plastic
IN74HC574ADW SOIC
TA = -55° to 125° C for all packages
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Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0 µA
High Noise Immunity Characteristic of CMOS Devices
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
PIN 20=VCC
PIN 10 = GND
Inputs
Clock
Output
Q
Output
Enable
D
L
L
L
H
L
H
L
L,H,
X
no
change
H
X
X
Z
X = don’t care
Z = high impedance
413
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