Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributorsfor availability and specifications.
SupplyVoltage 7V
InputVoltage 7V
OperatingFree Air Temperature Range
54LS b55§Ctoa
125§C
DM74LS 0§Ctoa
70§C
StorageTemperature 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

parametricvalues defined in the ‘‘Electrical Characteristics’’

table are not guaranteed at the absolute maximum ratings.

The‘‘Recommended Operating Conditions’’ table will define

theconditions for actual device operation.

Recommended Operating Conditions
Symbol Parameter 54LS14 DM74LS14 Units
Min Nom Max Min Nom Max
VCC SupplyVoltage 4.5 5 5.5 4.75 5 5.25 V
VTaPositive-GoingInput 1.5 1.6 2.0 1.4 1.6 1.9 V
ThresholdVoltage (Note 1)
VTbNegative-GoingInput 0.6 0.8 1.1 0.5 0.8 1 V
ThresholdVoltage (Note 1)
HYS InputHysteresis(Note 1) 0.4 0.8 0.4 0.8 V
IOH HighLevel Output Current b0.4 b0.4 mA
IOL LowLevel Output Current 4 8 mA
TAFreeAir Operating Temperature b55 125 0 70 §C
Electrical Characteristics overrecommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min Typ Max Units
(Note2)
VIInputClamp Voltage VCCeMin, IIeb
18mA b1.5 V
VOH HighLevel Output VCCeMin, IOH eMax 54LS 2.5 3.4 V
Voltage VILeMax DM74 2.7 3.4
VOL LowLevel Output VCCeMin, IOL eMax 54LS 0.25 0.4
Voltage VIHeMin DM74 0.35 0.5 V
VCCeMin, IOL e4 mA DM74 0.25 0.4
ITaInputCurrent at VCCe5V, VIeVTaDM74 b0.14 mA
Positive-GoingThreshold
ITbInputCurrent at VCCe5V, VIeVTbDM74 b0.18 mA
Negative-GoingThreshold
IIInputCurrent @Max VCC eMax, VIe7V DM74 0.1 mA
InputVoltage VCC eMax, VIe10.0V 54LS
IIH HighLevel Input Current VCC eMax, VIe2.7V 20 mA
IIL LowLevel Input Current VCC eMax, VIe0.4V b0.4 mA
IOS ShortCircuit VCC eMax 54LS b20 b100 mA
OutputCurrent (Note 3) DM74 b20 b100
ICCH SupplyCurrent with VCCeMax 8.6 16 mA
OutputsHigh
ICCL SupplyCurrent with VCCeMax 12 21 mA
OutputsLow
Note1: VCC e5V.
Note2: All typicals are at VCC e5V, TAe25§C.
Note3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
2