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DM74ALS520 • DM74ALS521
Absolute Maximum Ratings(Note 1)
Note 1: 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 tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at V
CC
= 5V, T
A
= 25°C.
Note 2: I
CC
is measured with EN grounded, A and B inputs at 4.5V and outputs OPEN.
Switching Characteristics
over recommended operating free air temperature range
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Typical θ
JA
N Package 62.0°C/W
M Package 82.0°C/W
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.5 5 5.5 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.8 V
I
OH
HIGH Level Output Current −2.6 mA
I
OL
LOW Level Output Current 24 mA
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min Typ Max Units
V
IK
Input Clamp Voltage V
CC
= 4.5V, I
I
= −18 mA −1.5 V
V
OH
HIGH Level V
CC
= 4.5V to 5.5V
V
CC
− 2V
Output Voltage I
OH
= −400 µA
V
CC
= 4.5V
2.4 3.2 V
I
OH
= Max
V
OL
LOW Level Output Voltage V
CC
= 4.5V I
OL
= 24 mA 0.35 0.5 V
I
I
Max HIGH V
CC
= 5.5V V
IH
= 5.5V
Input Current B Input DM74ALS520 0.1 mA
V
IH
= 7V, All Others
I
IH
HIGH Level V
CC
= 5.5V, All Others 20
µA
Input Current V
IH
= 2.7V B Input DM74ALS520 −200
I
IL
Low Level Input V
CC
= 5.5V, B Input DM74ALS520 −0.6 mA
Current V
IL
= 0.4V All Others −0.1 mA
I
O
Output Drive Current V
CC
= 5.5V V
O
= 2.25V −30 −112 mA
I
CC
Supply Current V
CC
= 5.5V (Note 2) 12 19 mA
Symbol Parameter Conditions
From To
Min Max Units
Input Output
t
PLH
Propagation Delay Time V
CC
= 4.5V to 5.5V A or B
A = B 312ns
LOW-to-HIGH Level Output C
L
= 50 pF Data
t
PHL
Propagation Delay Time R
L
= 500Ω A or B
A = B 520ns
HIGH-to-LOW Level Output Data
t
PLH
Propagation Delay Time
EN A = B 212ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
EN A = B 522ns
HIGH-to-LOW Level Output
