NSC DM54LS273W 8-bit register with clear Datasheet

DM54LS273/DM74LS273
8-Bit Register with Clear
General Description
Features
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 20pin package featuring 0.3 inch row spacing.
Y
Y
Y
Y
Edge-triggered
8-bit high speed register
Parallel in and out
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
CP
D0–D7
MR
Q0–Q7
C1995 National Semiconductor Corporation
TL/F/9825
Description
Clock Pulse Input (Active Rising Edge)
Data Inputs
Asynchronous Master Reset Input
(Active LOW)
Flip-Flop Outputs
RRD-B30M115/Printed in U. S. A.
DM54LS273/DM74LS273 8-Bit Register with Clear
April 1992
Absolute Maximum Ratings (Note)
Note: The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaranteed. 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.
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
b 55§ C to a 125§ C
DM54LS
DM74LS
0§ C to a 70§ C
b 65§ C to a 150§ C
Storage Temperature Range
Recommended Operating Conditions
Symbol
DM54LS273
Parameter
DM74LS273
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.75
5
5.25
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
IOH
High Level Output Current
IOL
Low Level Output Current
TA
Free Air Operating Temperature
ts(H)
ts(L)
Setup Time HIGH or LOW
Dn to CP
15
15
15
15
ns
th(H)
th(L)
Hold Time HIGH or LOW
Dn to CP
5
5
5
5
ns
tw(H)
tw(L)
CP Pulse Width HIGH or LOW
20
20
20
20
ns
tw(L)
MR Pulse Width LOW
20
20
ns
trec
Recovery Time
MR to CP
15
15
ns
2
2
V
0.7
0.8
V
b 0.4
b 0.4
mA
8
mA
70
§C
4
b 55
V
125
0
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 1)
Max
Units
b 1.5
V
VI
Input Clamp Voltage
VCC e Min, II e b18 mA
VOH
High Level Output
Voltage
VCC e Min, IOH e Max,
VIL e Max
DM54
2.5
DM74
2.7
Low Level Output
Voltage
VCC e Min, IOL e Max,
VIH e Min
DM74
0.35
0.5
IOL e 4 mA, VCC e Min
DM74
0.25
0.4
VOL
V
3.4
DM54
0.4
V
II
Input Current @ Max
Input Voltage
VCC e Max, VI e 7V
VI e 10V (DM54)
IIH
High Level Input Current
VCC e Max, VI e 2.7V
20
mA
IIL
Low Level Input Current
VCC e Max, VI e 0.4V
b 0.4
mA
IOS
Short Circuit
Output Current
VCC e Max
(Note 2)
Supply Current
VCC e Max
ICC
0.1
DM54
b 20
b 100
DM74
b 20
b 100
27
Note 1: All typicals are at VCC e 5V, TA 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
mA
mA
mA
Switching Characteristics VCC e a 5.0V, TA e a 25§ C
CL e 15 pF
Symbol
Parameter
DM74LS
DM54LS
Units
RL e 2 kX
Min
Max
Min
30
Max
fmax
Maximum Clock Frequency
30
tPLH
tPHL
Propagation Delay
CP to Qn
24
24
24
24
ns
tPLH
Propagation Delay
MR to Qn
27
27
ns
Functional Description
MHz
Truth Table
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. Information meeting the setup and hold time requirements of the
D inputs is transferred to the Q outputs on the LOW-toHIGH transition of the clock input.
MR
Inputs
CP
Dn
Outputs
Qn
L
H
H
X
L
L
X
H
L
L
H
L
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Logic Symbol
TL/F/9825 – 2
VCC 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
DM54LS273/DM74LS273 8-Bit Register with Clear
Physical Dimensions inches (millimeters) (Continued)
20-Lead Ceramic Flat Package (W)
Order Number DM54LS273W
NS Package Number W20A
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