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National Semiconductor Electronic Components Datasheet

54AC821 Datasheet

10-Bit D Flip-Flop

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August 1998
54AC821 54ACT821
10-Bit D Flip-Flop with TRI-STATE® Outputs
General Description
The ’AC/’ACT821 is a 10-bit D flip-flop with TRI-STATE out-
puts arranged in a broadside pinout.
The ’AC/’ACT821 is functionally identical to the AM29821.
Features
n TRI-STATE outputs for bus interfacing
n Noninverting outputs
n Outputs source/sink 24 mA
n ’ACT821 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’ACT821: 5962-88705
— ’AC821: 5962-91606
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP and Flatpak
IEEE/IEC
DS100355-1
Pin Names
D0– D9
O0– O9
OE
CP
DS100355-2
Description
Data Inputs
Data Outputs
Output Enable Input
Clock Input
DS100355-3
Pin Assignment for LCC
DS100355-4
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100355
www.national.com


National Semiconductor Electronic Components Datasheet

54AC821 Datasheet

10-Bit D Flip-Flop

No Preview Available !

Functional Description
The ’AC/’ACT821 consists of ten D-type edge-triggered
flip-flops. The buffered Clock (CP) and buffered Output En-
able (OE) are common to all flip-flops. The flip-flops will store
the state of their individual D inputs that meet the setup and
hold time requirements on the LOW-to-HIGH CP transition.
With OE LOW the contents of the flip-flops are available at
the outputs. When OE is HIGH the outputs go to the high im-
pedance state. Operation of the OE input does not affect the
state of the flip-flops.
The ’AC/’ACT821 is functionally and pin compatible with the
AM29821.
Function Table
Inputs
OE CP D
H NL
H NH
L NL
L NH
H = HIGH Voltage Level
L = LOW Voltage Level
Z = HIGH Impedance
N = LOW-to-HIGH Clock Transition
Internal
Q
L
H
L
H
Outputs
O
Z
Z
L
H
Function
High Z
High Z
Load
Load
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
DS100355-5
www.national.com
2


Part Number 54AC821
Description 10-Bit D Flip-Flop
Maker National Semiconductor
Total Page 8 Pages
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