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 20pin package featuring 0.3 inch row spacing.
Features
YEdge-triggered
Y8-bit high speed register
YParallel in and out
YCommon 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
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Pin Names |
Description |
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CP |
Clock Pulse Input (Active Rising Edge) |
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D0 ± D7 |
Data Inputs |
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MR |
Asynchronous Master Reset Input |
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(Active LOW) |
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Q0 ± Q7 |
Flip-Flop Outputs |
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April 1992
Clear with Register Bit-8 DM54LS273/DM74LS273
C1995 National Semiconductor Corporation |
TL/F/9825 |
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 |
b55§C to a125§C |
DM54LS |
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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 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.
Recommended Operating Conditions
Symbol |
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Parameter |
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DM54LS273 |
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DM74LS273 |
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Units |
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Min |
Nom |
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Max |
Min |
Nom |
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Max |
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VCC |
Supply Voltage |
4.5 |
5 |
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5.5 |
4.75 |
5 |
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5.25 |
V |
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VIH |
High Level Input Voltage |
2 |
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2 |
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V |
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VIL |
Low Level Input Voltage |
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0.7 |
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0.8 |
V |
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IOH |
High Level Output Current |
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b0.4 |
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b0.4 |
mA |
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IOL |
Low Level Output Current |
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4 |
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8 |
mA |
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TA |
Free Air Operating Temperature |
b55 |
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125 |
0 |
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70 |
§C |
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ts(H) |
Setup Time HIGH or LOW |
15 |
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15 |
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ns |
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ts(L) |
Dn to CP |
15 |
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15 |
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th(H) |
Hold Time HIGH or LOW |
5 |
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5 |
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ns |
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th(L) |
Dn to CP |
5 |
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5 |
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tw(H) |
CP Pulse Width HIGH or LOW |
20 |
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20 |
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ns |
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tw(L) |
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20 |
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20 |
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tw(L) |
MR Pulse Width LOW |
20 |
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20 |
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ns |
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trec |
Recovery Time |
15 |
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15 |
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ns |
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MR to CP |
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Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol |
Parameter |
Conditions |
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Min |
Typ |
Max |
Units |
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(Note 1) |
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VI |
Input Clamp Voltage |
VCC e Min, II e b18 mA |
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b1.5 |
V |
VOH |
High Level Output |
VCC e Min, IOH e Max, |
DM54 |
2.5 |
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V |
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Voltage |
VIL e Max |
DM74 |
2.7 |
3.4 |
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VOL |
Low Level Output |
VCC e Min, IOL e Max, |
DM54 |
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0.4 |
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Voltage |
VIH e Min |
DM74 |
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0.35 |
0.5 |
V |
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IOL e 4 mA, VCC e Min |
DM74 |
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0.25 |
0.4 |
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II |
Input Current @ Max |
VCC e Max, VI e 7V |
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0.1 |
mA |
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Input Voltage |
VI e 10V (DM54) |
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IIH |
High Level Input Current |
VCC e Max, VI e 2.7V |
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20 |
mA |
IIL |
Low Level Input Current |
VCC e Max, VI e 0.4V |
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b0.4 |
mA |
IOS |
Short Circuit |
VCC e Max |
DM54 |
b20 |
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b100 |
mA |
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Output Current |
(Note 2) |
DM74 |
b20 |
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b100 |
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ICC |
Supply Current |
VCC e Max |
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27 |
mA |
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
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