Philips Semiconductors
Product specification
Triple 3-input NOR gate
74ALS27
TYPE
74ALS27
TYPICAL
PROPAGATION DELAY
4.0ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
1.5mA
PIN CONFIGURATION
1A
1B
2A
1
2
3
4
5
6
7
14 V
CC
13 1C
12 1Y
11 3C
10 3B
9
8
3A
3Y
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
74ALS27N
74ALS27D
DRAWING
NUMBER
2B
2C
2Y
GND
14-pin plastic DIP
14-pin plastic SO
SOT27-1
SOT108-1
SC00014
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
nA, nB, nC
nY
Data inputs
Data output
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
1.0/1.0
20/80
LOAD VALUE
HIGH/LOW
20µA/0.1mA
0.4mA/8mA
NOTE:
One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
IEC/IEEE SYMBOL
1
w1
12
1
2
13
3
4
5
9
10
11
2
13
3
1A 1B 1C 2A 2B 2C 3A 3B 3C
4
5
1Y 2Y 3Y
9
10
12
V
CC
= Pin 14
GND = Pin 7
6
8
11
8
6
SC00016
SF00036
LOGIC DIAGRAM
1A
1B
1C
2A
2B
2C
3A
3B
V
CC
= Pin 14
GND = Pin 7
3C
1
2
13
3
4
5
9
10
11
12
1Y
FUNCTION TABLE
INPUTS
nA
H
6
2Y
OUTPUT
nC
X
X
H
L
nY
L
L
L
H
nB
X
H
X
L
X
X
8
L
3Y
SC00028
H = High voltage level
L = Low voltage level
X = Don’t care
1991 Feb 08
2
853–1162 01670
Philips Semiconductors
Product specification
Triple 3-input NOR gate
74ALS27
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature range
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to V
CC
16
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
V
CC
V
IH
V
IL
I
Ik
I
OH
I
OL
T
amb
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature range
0
PARAMETER
MIN
4.5
2.0
0.8
–18
–0.4
8
+70
NOM
5.0
MAX
5.5
V
V
V
mA
mA
mA
°C
UNIT
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
V
OH
V
O
OL
V
IK
I
I
I
IH
I
IL
I
O
I
CC
PARAMETER
High-level output voltage
Low-level
Low level output voltage
Input clamp voltage
Input current at maximum input voltage
High-level input current
Low-level input current
Output current
3
Supply current (total)
I
CCH
I
CCL
TEST CONDITIONS
1
MIN
V
CC
±10%,
V
IL
= MAX, V
IH
= MIN, I
OH
= –0.4mA
V
CC
= MIN, V
IL
= MAX,
,
,
V
IH
= MIN
V
CC
= MIN, I
I
= I
IK
V
CC
= MAX, V
I
= 7.0V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.5V
V
CC
= MAX, V
O
= 2.25V
V
CC
= MAX
V
I
= 0V
V
I
= 4.5V
–30
1.0
2.0
I
OL
= 4mA
I
OL
= 8mA
V
CC
– 2
0.25
0.35
–0.73
0.40
0.50
–1.5
0.1
20
–0.1
–112
1.8
4.0
LIMITS
TYP
2
UNIT
MAX
V
V
V
V
mA
µA
mA
mA
mA
mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25°C.
3. The output conditions have been chosen to produce a current that closely approximate one half of the true short-circuit output current, I
OS
.
1991 Feb 08
3
Philips Semiconductors
Product specification
Triple 3-input NOR gate
74ALS27
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST CONDITION
T
amb
= 0°C to +70°C
V
CC
= +5.0V
±
10%
C
L
= 50pF, R
L
= 500Ω
MIN
t
PLH
t
PHL
Propagation delay
nA, nB, nC to nY
Waveform 1
2.0
2.0
MAX
15.0
9.0
ns
UNIT
AC WAVEFORMS
For all waveforms, V
M
= 1.3V.
nA, nB, nC
V
M
t
PHL
V
M
t
PLH
V
M
V
M
nY
SC00018
Waveform 1. Propagation Delay for Data to Output
TEST CIRCUIT AND WAVEFORMS
V
CC
NEGATIVE
PULSE
V
IN
PULSE
GENERATOR
R
T
D.U.T.
V
OUT
90%
V
M
10%
t
THL (
t
f
f
)
C
L
R
L
t
w
V
M
10%
t
TLH (
t
r
)
0.3V
90%
AMP (V)
t
TLH (
t
r
)
90%
t
THL (
t
f
)
AMP (V)
90%
V
M
t
w
10%
0.3V
Test Circuit for Totem-pole Outputs
POSITIVE
PULSE
10%
V
M
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
Input Pulse Definition
INPUT PULSE REQUIREMENTS
Family
Amplitude V
M
74ALS
3.5V
1.3V
Rep.Rate
1MHz
t
w
500ns
t
TLH
2.0ns
t
THL
2.0ns
SC00005
1991 Feb 08
4
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