NSC 5962-8870501LA, 5962-8870501KA, 5962-88705013A Datasheet
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 outputs 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
Pin Names Description
D
0–D9
Data Inputs
O
0–O9
Data Outputs
OE
Output Enable Input
CP Clock Input
Connection Diagrams
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
FACT
®
is a registered trademark of Fairchild Semiconductor Corporation.
DS100355-1
IEEE/IEC
DS100355-2
Pin Assignment
for DIP and Flatpak
DS100355-3
Pin Assignment for LCC
DS100355-4
August 1998
54AC821
•
54ACT821 10-Bit D Flip-Flop with TRI-STATE Outputs
© 1998 National Semiconductor Corporation DS100355 www.national.com
Functional Description
The ’AC/’ACT821 consists of ten D-type edge-triggered
flip-flops. The buffered Clock (CP) and buffered Output Enable (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 impedance 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 Internal Outputs Function
OE
CP D Q O
H
N
L L Z High Z
H
N
H H Z High Z
L
N
L L L Load
L
N
H H H Load
H=HIGH Voltage Level
L=LOW Voltage Level
Z=HIGH Impedance
N
=
LOW-to-HIGH Clock Transition
Logic Diagram
DS100355-5
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
=
−0.5V −20 mA
V
I
=
V
CC
+ 0.5V +20 mA
DC Input Voltage (V
I
) −0.5V to VCC+ 0.5V
DC Output Diode Current (I
OK
)
V
O
=
−0.5V −20 mA
V
O
=
V
CC
+ 0.5V +20 mA
DC Output Voltage (V
O
) −0.5V to VCC+ 0.5V
DC Output Source
or Sink Current (I
O
)
±
50 mA
DC V
CC
or Ground Current
per Output Pin (I
CC
or I
GND
)
±
50 mA
Storage Temperature (T
STG
) −65˚C to +150˚C
Junction Temperature (T
J
)
CDIP 175˚C
Recommended Operating
Conditions
Supply Voltage (VCC)
’AC 2.0V to 6.0V
’ACT 4.5V to 5.5V
Input Voltage (V
I
) 0VtoV
CC
Output Voltage (VO) 0VtoV
CC
Operating Temperature (TA)
54AC/ACT −55˚C to +125˚C
Minimum Input Edge Rate (∆V/∆t)
’AC Devices
V
IN
from 30%to 70%of V
CC
V
CC
@
3.3V, 4.5V, 5.5V 125 mV/ns
Minimum Input Edge Rate (∆V/∆t)
’ACT Devices
V
IN
from 0.8V to 2.0V
V
CC
@
4.5V, 5.5V 125 mV/ns
Note 1: Absolute maximum ratings are those values beyond which damage
to the device may occur. The databook specifications should be met, without
exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. National does not recommend operation of FACT
®
circuits outside databook specifications.
DC Characteristics for ’AC Family Devices
54AC
Symbol Parameter V
CC
(V)
T
A
=
−55˚C to +125˚C Units Conditions
Guaranteed Limits
V
IH
Minimum High Level 3.0 2.1 V
OUT
=
0.1V
Input Voltage 4.5 3.15 V or V
CC
− 0.1V
5.5 3.85
V
IL
Maximum Low Level 3.0 0.9 V
OUT
=
0.1V
Input Voltage 4.5 1.35 V or V
CC
− 0.1V
5.5 1.65
V
OH
Minimum High Level 3.0 2.9 I
OUT
=
−50 µA
Output Voltage 4.5 4.4 V
5.5 5.4
(Note 2)
V
IN
=
V
IL
or V
IH
3.0 2.4 I
OH
=
−12 mA
4.5 3.7 V I
OH
=
−24 mA
5.5 4.7 I
OH
=
−24 mA
V
OL
Maximum Low Level 3.0 0.1 I
OUT
=
50 µA
Output Voltage 4.5 0.1 V
5.5 0.1
(Note 2)
V
IN
=
V
IL
or V
IH
3.0 0.50 I
OL
=
12 mA
4.5 0.50 V I
OL
=
24 mA
5.5 0.50 I
OL
=
24 mA
I
IN
Maximum Input 5.5
±
1.0 µA V
I
=
V
CC
, GND
Leakage Current
I
OZ
Maximum TRI-STATE VI(OE)=VIL,V
IH
Current 5.5
±
10.0 µA V
I
=
V
CC
, GND
V
O
=
V
CC
, GND
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