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§Ctoa
125§C
DM74LS 0§Ctoa
70§C
Storage Temperature Range b65§Ctoa
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
VCC Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
VIH High Level Input Voltage 2 2 V
VIL Low Level Input Voltage 0.7 0.8 V
IOH High Level Output Current b0.4 b0.4 mA
IOL Low Level Output Current 4 8 mA
TAFree Air Operating Temperature b55 125 0 70 §C
ts(H) Setup Time HIGH or LOW 15 15 ns
ts(L) Dnto CP 15 15
th(H) Hold Time HIGH or LOW 5 5 ns
th(L) Dnto CP 5 5
tw(H) CP Pulse Width HIGH or LOW 20 20 ns
tw(L) 20 20
tw(L) MR Pulse Width LOW 20 20 ns
trec 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)
VIInput Clamp Voltage VCC eMin, IIeb
18 mA b1.5 V
VOH High Level Output VCC eMin, IOH eMax, DM54 2.5 V
Voltage VIL eMax DM74 2.7 3.4
VOL Low Level Output VCC eMin, IOL eMax, DM54 0.4
Voltage VIH eMin DM74 0.35 0.5 V
IOL e4 mA, VCC eMin DM74 0.25 0.4
IIInput Current @Max VCC eMax, VIe7V 0.1 mA
Input Voltage VIe10V (DM54)
IIH High Level Input Current VCC eMax, VIe2.7V 20 mA
IIL Low Level Input Current VCC eMax, VIe0.4V b0.4 mA
IOS Short Circuit VCC eMax DM54 b20 b100 mA
Output Current (Note 2) DM74 b20 b100
ICC Supply Current VCC eMax 27 mA
Note 1: All typicals are at VCC e5V, TAe25§C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
2