Fairchild DM74ALS27 service manual
tm
Y =
H =
DM74ALS27 Triple 3-Input NOR Gate
May 2007
DM74ALS27
Triple 3-Input NOR Gate
Features
■
Switching specifications at 50pF
Switching specifications guaranteed over full
■
temperature and V
■
Advanced oxide-isolated, ion-implanted Schottky TTL
process
Functionally and pin for pin compatible with Schottky
■
and low power Schottky TTL counterpart
Improved AC performance over Schottky and low
■
power Schottky counterparts
CC
range
General Description
This device contains three independent gates, each of
which performs the logic NOR function.
Ordering Information
Order
Number
DM74ALS27M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number.
Package
Number Package Description
Connection Diagram Function Table
A + B + C
Inputs Output
ABC Y
HXX L
XHX L
XXH L
LLL H
HIGH Logic Level
L = LOW Logic Level
X = Either LOW or HIGH Logic Level
©1986 Fairchild Semiconductor Corporation www.fairchildsemi.com
DM74ALS27 Rev. 1.2
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Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol Parameter Rating
T
V
θ
CC
V
T
A
STG
JA
Supply Voltage 7V
Input Voltage 7V
I
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range –65°C to +150°C
Typical Thermal Resistance 116.0°C/W
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
DM74ALS27 Triple 3-Input NOR Gate
Symbol Parameter Min. Nom. Max. Units
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage 4.5 5 5.5 V
HIGH Level Input Voltage 2 V
LOW Level Input Voltage 0.8 V
HIGH Level Output Current –0.4 mA
LOW Level Output Current 8 mA
Free Air Operating Temperature 0 70 °C
Electrical Characteristics
Over recommended operating free air temperature range. All typical values are measured at V
Symbol Parameter Conditions Min Typ Max Units
V
V
V
I
I
Input Clamp Voltage V
IK
HIGH Level Output Voltage I
OH
LOW Level Output Voltage V
OL
I
Input Current @ Max Input Voltage V
I
HIGH Level Input Current V
IH
I
LOW Level Input Current V
IL
I
Output Drive Current V
O
Supply Current V
CC
4.5V, I
CC
–0.4mA,
OH
V
4.5V to 5.5V
CC
4.5V, I
CC
5.5V, V
CC
5.5V, V
CC
5.5V, V
CC
5.5V, V
CC
5.5V Outputs HIGH 0.97 1.8 mA
CC
–18mA –1.5 V
I
V
– 2 V
CC
8mA 0.35 0.5 V
OL
7V 0.1 mA
IH
2.7V 20 µA
IH
0.4V –0.1 mA
IL
2.25V –30 –112 mA
O
Outputs LOW 2 4
CC
5V, T
A
25°C.
Switching Characteristics
Over recommended operating free air temperature range.
Symbol Parameter Conditions Min. Max. Units
t
PLH
t
PHL
©1986 Fairchild Semiconductor Corporation www.fairchildsemi.com
DM74ALS27 Rev. 1.2 2
Propagation Delay Time, LOW-to-HIGH Level Output V
Propagation Delay Time, HIGH-to-LOW Level Output 3 9 ns
CC
R
L
500 Ω , C
4.5V to 5.5V,
50pF
L
415ns
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