54ACT574 반도체 회로 부품 판매점
Octal D-Type Flip-Flop
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 National Semiconductor |
www.DataSheet4U.com
September 1998
54AC574 • 54ACT574
Octal D-Type Flip-Flop with TRI-STATE® Outputs
General Description
The ’AC/’ACT574 is a high-speed, low power octal flip-flop
with a buffered common Clock (CP) and a buffered common
Output Enable (OE). The information presented to the D in-
puts is stored in the flip-flops on the LOW-to-HIGH Clock
(CP) transition.
The ’AC/’ACT574 is functionally identical to the ’AC/’ACT374
except for the pinouts.
Features
n ICC and IOZ reduced by 50%
n Inputs and outputs on opposite sides of package
allowing easy interface with microprocessors
n Useful as input or output port for microprocessors
n Functionally identical to ’AC/’ACT374
n TRI-STATE outputs for bus-oriented applications
n Outputs source/sink 24 mA
n ’ACT574 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’ACT574: 5962-89601
Logic Symbols
IEEE/IEC
DS100256-1
DS100256-4
Pin Names
D0– D7
CP
OE
O0– O7
Description
Data Inputs
Clock Pulse Input
TRI-STATE Output Enable Input
TRI-STATE Outputs
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT™ is a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100256
www.national.com
Connection Diagrams
Pin Assignment for DIP,
and Flatpak
DS100256-2
Pin Assignment
for LCC
DS100256-3
Functional Description
The ’AC/’ACT574 consists of eight edge-triggered flip-flops
with individual D-type inputs and TRI-STATE true outputs.
The buffered clock and buffered Output Enable are common
to all flip-flops. The eight flip-flops will store the state of their
individual D inputs that meet the setup and hold time require-
ments on the LOW-to-HIGH Clock (CP) transition. With the
Output Enable (OE) LOW, the contents of the eight flip-flops
are available at the outputs. When OE is HIGH, the outputs
go to the high impedance state. Operation of the OE input
does not affect the state of the flip-flops.
Function Table
Inputs Internal Outputs
OE CP D
H HL
Q
NC
ON
Z
H H H NC
Z
H NL
L
Z
H NH
H
Z
L NL
L
L
L NH
H
H
L H L NC
NC
L H H NC
NC
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
N = LOW-to-HIGH Transition
NC = No Change
Function
Hold
Hold
Load
Load
Data Available
Data Available
No Change in Data
No Change in Data
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54ACT574 flip-flop
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