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Электронный компонент: 74273

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TL F 9825
DM54LS273DM74LS273
8-Bit
Register
with
Clear
April 1992
DM54LS273 DM74LS273
8-Bit Register with Clear
General Description
The 'LS273 is a high speed 8-bit register consisting of eight
D-type flip-flops with a common Clock and an asynchronous
active LOW Master Reset This device is supplied in a 20-
pin package featuring 0 3 inch row spacing
Features
Y
Edge-triggered
Y
8-bit high speed register
Y
Parallel in and out
Y
Common clock and master reset
Connection Diagram
Dual-In-Line Package
TL F 9825 1
Order Number DM54LS273E DM54LS273J
DM54LS273W DM74LS273M or DM74LS273N
See NS Package Number E20A J20A M20B
N20A or W20A
Pin Names
Description
CP
Clock Pulse Input (Active Rising Edge)
D0 D7
Data Inputs
MR
Asynchronous Master Reset Input
(Active LOW)
Q0 Q7
Flip-Flop Outputs
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
(Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM54LS
b
55 C to
a
125 C
DM74LS
0 C to
a
70 C
Storage Temperature Range
b
65 C to
a
150 C
Note
The ``Absolute Maximum Ratings'' are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ``Electrical Characteristics''
table are not guaranteed at the absolute maximum ratings
The ``Recommended Operating Conditions'' table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
Parameter
DM54LS273
DM74LS273
Units
Min
Nom
Max
Min
Nom
Max
V
CC
Supply Voltage
4 5
5
5 5
4 75
5
5 25
V
V
IH
High Level Input Voltage
2
2
V
V
IL
Low Level Input Voltage
0 7
0 8
V
I
OH
High Level Output Current
b
0 4
b
0 4
mA
I
OL
Low Level Output Current
4
8
mA
T
A
Free Air Operating Temperature
b
55
125
0
70
C
t
s
(H)
Setup Time HIGH or LOW
15
15
ns
t
s
(L)
D
n
to CP
15
15
t
h
(H)
Hold Time HIGH or LOW
5
5
ns
t
h
(L)
D
n
to CP
5
5
t
w
(H)
CP Pulse Width HIGH or LOW
20
20
ns
t
w
(L)
20
20
t
w
(L)
MR Pulse Width LOW
20
20
ns
t
rec
Recovery Time
15
15
ns
MR to CP
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
V
I
Input Clamp Voltage
V
CC
e
Min I
I
e b
18 mA
b
1 5
V
V
OH
High Level Output
V
CC
e
Min I
OH
e
Max
DM54
2 5
V
Voltage
V
IL
e
Max
DM74
2 7
3 4
V
OL
Low Level Output
V
CC
e
Min I
OL
e
Max
DM54
0 4
Voltage
V
IH
e
Min
DM74
0 35
0 5
V
I
OL
e
4 mA V
CC
e
Min
DM74
0 25
0 4
I
I
Input Current
Max
V
CC
e
Max V
I
e
7V
0 1
mA
Input Voltage
V
I
e
10V (DM54)
I
IH
High Level Input Current
V
CC
e
Max V
I
e
2 7V
20
m
A
I
IL
Low Level Input Current
V
CC
e
Max V
I
e
0 4V
b
0 4
mA
I
OS
Short Circuit
V
CC
e
Max
DM54
b
20
b
100
mA
Output Current
(Note 2)
DM74
b
20
b
100
I
CC
Supply Current
V
CC
e
Max
27
mA
Note 1
All typicals are at V
CC
e
5V T
A
e
25 C
Note 2
Not more than one output should be shorted at a time and the duration should not exceed one second
2
Switching Characteristics
V
CC
e a
5 0V T
A
e a
25 C
C
L
e
15 pF
Symbol
Parameter
DM54LS
DM74LS
Units
R
L
e
2 kX
Min
Max
Min
Max
f
max
Maximum Clock Frequency
30
30
MHz
t
PLH
Propagation Delay
24
24
ns
t
PHL
CP to Q
n
24
24
t
PLH
Propagation Delay
27
27
ns
MR to Q
n
Functional Description
The 'LS273 is an 8-bit parallel register with a common Clock
and common Master Reset When the MR input is LOW the
Q outputs are LOW independent of the other inputs Infor-
mation meeting the setup and hold time requirements of the
D inputs is transferred to the Q outputs on the LOW-to-
HIGH transition of the clock input
Truth Table
Inputs
Outputs
MR
CP
D
n
Q
n
L
X
X
L
H
L
H
H
H
L
L
L
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Logic Symbol
TL F 9825 2
V
CC
e
Pin 20
GND
e
Pin 10
Logic Diagram
TL F 9825 3
3
Physical Dimensions
inches (millimeters)
Ceramic Leadless Chip Carrier Package (E)
Order Number DM54LS273E
NS Package Number E20A
20-Lead Ceramic Dual-In-Line Package (J)
Order Number DM54LS273J
NS Package Number J20A
4
Physical Dimensions
inches (millimeters) (Continued)
20-Lead Wide Small Outline Molded Package (M)
Order Number DM74LS273M
NS Package Number M20B
20-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS273N
NS Package Number N20A
5
DM54LS273DM74LS273
8-Bit
Register
with
Clear
Physical Dimensions
inches (millimeters) (Continued)
20-Lead Ceramic Flat Package (W)
Order Number DM54LS273W
NS Package Number W20A
LIFE SUPPORT POLICY
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
2 A critical component is any component of a life
systems which (a) are intended for surgical implant
support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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National Semiconductor
National Semiconductor
Corporation
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