Philips Semiconductors
Product specification
74ALS151
8-input multiplexer
2
1991 Feb 08
8531022 01670
FEATURES
8-to-1 multiplexing
On chip decoding
Multi-function capability
Complementary outputs
See 74ALS251 for 3-State version
DESCRIPTION
The 74ALS151 is a logic implementation of a single 8-position
switch with the switch position controlled by the state of three select
(S0, S1, S2) inputs. True (Y) and complementary (Y) outputs are
both provided.
The enable (E) is active-Low. When E is High, Y output is Low and
the Y output is High regardless of all other inputs.
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS151
8.0ns
8.0mA
PIN CONFIGURATION
16
15
14
13
12
11
10
7
6
5
4
3
2
1
E
V
CC
I7
S0
S1
I6
I4
I5
I3
I2
Y
I1
I0
Y
9
8
GND
S2
SF00742
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
10%,
T
amb
= 0
C to +70
C
DRAWING
NUMBER
16-pin plastic DIP
74ALS151N
SOT38-4
16-pin plastic SO
74ALS151D
SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74ALS (U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
I0 I7
Data inputs
1.0/1.0
20
A/0.1mA
S0 S2
Select inputs
1.0/1.0
20
A/0.1mA
E
Enable input (active-Low)
1.0/1.0
20
A/0.1mA
Y, Y
Data outputs
130/240
2.6mA/24mA
NOTE:
One (1.0) ALS unit load is defined as: 20
A in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
1
2
3
V
CC
= Pin 16
GND = Pin 8
SF00743
6
5
11
10
9
S0
S1
S2
7
4
12
13
14
15
E
Y
Y
I0
I1
I2
I3
I4
I5
I6
I7
IEC/IEEE SYMBOL
SF00744
MUX
7
11
3
2
1
5
6
0
G
0
7
10
2
EN
9
4
14
13
12
15
Philips Semiconductors
Product specification
74ALS151
8-input multiplexer
1991 Feb 08
4
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
PARAMETER
RATING
UNIT
V
CC
Supply voltage
0.5 to +7.0
V
V
IN
Input voltage
0.5 to +7.0
V
I
IN
Input current
30 to +5
mA
V
OUT
Voltage applied to output in High output state
0.5 to V
CC
V
I
OUT
Current applied to output in Low output state
48
mA
T
amb
Operating free-air temperature range
0 to +70
C
T
stg
Storage temperature range
65 to +150
C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
MIN
NOM
MAX
V
CC
Supply voltage
4.5
5.0
5.5
V
V
IH
High-level input voltage
2.0
V
V
IL
Low-level input voltage
0.8
V
I
Ik
Input clamp current
18
mA
I
OH
High-level output current
2.6
mA
I
OL
Low-level output current
24
mA
T
amb
Operating free air temperature range
0
+70
C
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS
1
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN
TYP
2
MAX
UNIT
V
O
High level output voltage
V
CC
=
10%, V
IL
= MAX,
I
OH
= 0.4mA
V
CC
2
V
V
OH
High-level output voltage
CC
,
IL
,
V
IH
= MIN
I
OH
= MAX
2.4
3.2
V
V
O
Low level output voltage
V
CC
= MIN, V
IL
= MAX,
I
OL
= 12mA
0.25
0.40
V
V
OL
Low-level output voltage
CC
,
IL
,
V
IH
= MIN
I
OL
= 24mA
0.35
0.50
V
V
IK
Input clamp voltage
V
CC
= MIN, I
I
= I
IK
0.73
1.5
V
I
I
Input current at minimum input voltage
V
CC
= MAX, V
I
= 7.0V
0.1
mA
I
IH
High-level input current
V
CC
= MAX, V
I
= 2.7V
20
A
I
IL
Low-level input current
V
CC
= MAX, V
I
= 0.4V
0.1
mA
I
O
Output current
3
V
CC
= MAX, V
O
= 2.25V
30
112
mA
I
CC
Supply current (total)
V
CC
= MAX
8.0
12
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 approximates one half of the true short-circuit output current, I
OS
.
Philips Semiconductors
Product specification
74ALS151
8-input multiplexer
1991 Feb 08
5
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
= 500
UNIT
MIN
MAX
t
PLH
t
PHL
Propagation delay
In to Y
Waveform 1
3.0
5.0
12.0
12.0
ns
t
PLH
t
PHL
Propagation delay
In to Y
Waveform 2
3.0
5.0
15.0
15.0
ns
t
PLH
t
PHL
Propagation delay
Sn to Y
Waveform 1, 2
5.0
7.0
15.0
16.0
ns
t
PLH
t
PHL
Propagation delay
Sn to Y
Waveform 1, 2
5.0
5.0
15.0
16.0
ns
t
PLH
t
PHL
Propagation delay
E to Y
Waveform 1
4.0
4.0
12.0
12.0
ns
t
PLH
t
PHL
Propagation delay
E to Y
Waveform 1
4.0
5.0
12.0
14.0
ns
AC WAVEFORMS
For all waveforms, V
M
= 1.3V.
V
M
V
M
V
M
V
M
V
OUT
V
IN
t
PHL
t
PLH
SF00093
Waveform 1.
Propagation Delay for Inverting Output
V
M
V
M
V
M
V
M
V
OUT
V
IN
t
PLH
t
PHL
SF00092
Waveform 2.
Propagation Delay for Non-inverting Output
TEST CIRCUIT AND WAVEFORMS
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0.3V
0.3V
tTHL (tf
f
)
INPUT PULSE REQUIREMENTS
Rep.Rate
t
w
t
TLH
t
THL
1MHz
500ns
2.0ns
2.0ns
Input Pulse Definition
VCC
Family
74ALS
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for Totem-pole Outputs
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.
tTHL (tf
)
tTLH (tr
)
tTLH (tr
)
AMP (V)
Amplitude
3.5V
1.3V
V
M
SC00005
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