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National Semiconductor Electronic Components Datasheet

74273 Datasheet

8-Bit Register with Clear

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74273 pdf
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
April 1992
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
Description
Clock Pulse Input (Active Rising Edge)
Data Inputs
Asynchronous Master Reset Input
(Active LOW)
Flip-Flop Outputs
C1995 National Semiconductor Corporation TL F 9825
RRD-B30M115 Printed in U S A


National Semiconductor Electronic Components Datasheet

74273 Datasheet

8-Bit Register with Clear

No Preview Available !

74273 pdf
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
b55 C to a125 C
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 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
VCC
VIH
VIL
IOH
IOL
TA
ts(H)
ts(L)
th(H)
th(L)
tw(H)
tw(L)
tw(L)
trec
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Setup Time HIGH or LOW
Dn to CP
Hold Time HIGH or LOW
Dn to CP
CP Pulse Width HIGH or LOW
MR Pulse Width LOW
Recovery Time
MR to CP
Min
45
2
b55
15
15
5
5
20
20
20
DM54LS273
Nom
Max
5 55
07
b0 4
4
125
15
DM74LS273
Min Nom Max
4 75 5
5 25
2
08
b0 4
8
0 70
15
15
5
5
20
20
20
15
Units
V
V
V
mA
mA
C
ns
ns
ns
ns
ns
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
VOH
Input Clamp Voltage
High Level Output
Voltage
VCC e Min II e b18 mA
VCC e Min IOH e Max
VIL e Max
DM54
DM74
25
27
VOL Low Level Output
Voltage
VCC e Min IOL e Max
VIH e Min
DM54
DM74
IOL e 4 mA VCC e Min
DM74
II
Input Current Max
VCC e Max VI e 7V
Input Voltage
VI e 10V (DM54)
IIH
High Level Input Current
VCC e Max VI e 2 7V
IIL
Low Level Input Current
VCC e Max VI e 0 4V
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b20
b20
ICC Supply Current
VCC e Max
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
Typ
(Note 1)
34
0 35
0 25
Max
b1 5
04
05
04
01
20
b0 4
b100
b100
27
Units
V
V
V
mA
mA
mA
mA
mA
2


Part Number 74273
Description 8-Bit Register with Clear
Maker National Semiconductor
Total Page 6 Pages
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